LTC5585 Datasheet by Analog Devices Inc.

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LTC5585
1
5585fb
For more information www.linear.com/LTC5585
TYPICAL APPLICATION
FEATURES DESCRIPTION
Wideband IQ Demodulator
with IIP2 and DC Offset
Control
The LTC
®
5585 is a direct conversion quadrature demodu-
lator optimized for high linearity receiver applications in
the 400MHz to 4GHz frequency range. It is suitable for
communications receivers where an RF signal is directly
converted into I and Q baseband signals with bandwidth
of 530MHz or higher. The LTC5585 incorporates balanced
I and Q mixers, LO buffer amplifiers and a precision, high
frequency quadrature phase shifter. The integrated on-chip
broadband transformer provides a single-ended interface
at the RF input with simple off-chip L-C matching. In ad-
dition, the LTC5585 provides four analog control voltage
interface pins for IIP2 and DC offset correction, greatly
simplifying system calibration.
The high linearity of the LTC5585 provides excellent spur-
free dynamic range for the receiver. This direct conversion
demodulator can eliminate the need for intermediate fre-
quency (IF) signal processing, as well as the corresponding
requirements for image filtering and IF filtering. These
I/Q outputs can interface directly to channel-select filters
(LPFs) or to baseband amplifiers.
L, LT, LTC , LT M , Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
Direct Conversion Receiver with IIP2 and DC Offset Calibration
APPLICATIONS
n 400MHz to 4GHz Operating Frequency
n High IIP3: 28.7dBm at 700MHz, 25.7dBm at 1.95GHz
n High IIP2: 70dBm at 700MHz, 60dBm at 1.95GHz
n User Adjustable IIP2 Up to 80dBm
n User Adjustable DC Offset Null
n High Input P1dB: 16dBm at 1950MHz
n I/Q Bandwidth of 530MHz or Higher
n Image Rejection: 43dB at 1950MHz
n Noise Figure: 13.5dB at 700MHz
12.7dB at 1.95GHz
n Conversion Gain: 2.0dB at 700MHz
2.4dB at 1.95GHz
n Single-Ended RF with On-Chip Transformer
n Shutdown Mode
n Operating Temperature Range (TC): –40°C to 105°C
n 24-Lead 4mm × 4mm QFN Package
n LTE/W-CDMA/TD-SCDMA Base Station Receivers
n Wideband DPD Receivers
n Point-To-Point Broadband Radios
n High Linearity Direct Conversion I/Q Receivers
n Image Rejection Receivers
A/D
D/A
D/A
VGA
VGA
5585 TA01a
LPF
RF
BPFLNABPF RF
INPUT
LO
EN
LO INPUT
ENABLE
LPF
IP2 ADJUST
DC OFFSET
I+
I
Q+
Q
90°
IP2 AND DC
OFFSET CAL
LTC5585
VCC
5V
IP2 ADJUST
DC OFFSET
IP2 AND DC
OFFSET CAL
D/A
D/A
A/D
IIP2 vs IP2I, IP2Q Trim Voltage
IP2I, IP2Q (V)
0
IIP2 (dBm)
80
90
100
0.8 0.9
5585 G09
70
60
40 0.2 0.4 0.6
0.1
1.0
0.3 0.5 0.7
50
120
fRF = 700MHz
110
I, –40°C
I, 25°C
I, 85°C
I, 105°C
Q, –40°C
Q, 25°C
Q, 85°C
Q, 105°C
LTC5585 TOP vwEw
LTC5585
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For more information www.linear.com/LTC5585
PIN CONFIGURATIONABSOLUTE MAXIMUM RATINGS
VCC Supply Voltage ................................... 0.3V to 5.5V
VCAP Voltage .................................................VCC ±0.05V
I, I+, Q+, Q, CMI, CMQ Voltage ........2.5V to VCC + 0.3V
Voltage on Any Other Pin .................0.3V to VCC + 0.3V
LO+, LO, RF Input Power ....................................20dBm
RF Input DC Voltage ............................................... ±0.1V
Maximum Junction Temperature (TJMAX) ............. 150°C
Operating Temperature Range (TC) ........40°C to 105°C
Storage Temperature Range .................. 6C to 150°C
(Note 1)
24 23 22 21 20 19
7 8 9
TOP VIEW
25
GND
UF PACKAGE
24-LEAD (4mm
×
4mm) PLASTIC QFN
10 11 12
6
5
4
3
2
1
13
14
15
16
17
18
IP2Q
DCOQ
DCOI
IP2I
RF
GND
CMQ
V
CAP
LO
LO+
GND
GND
REF
I+
I
Q+
Q
CMI
EN
GND
VBIAS
VCC
EDC
EIP2
TJMAX = 150°C, θJC = 7°C/W
EXPOSED PAD (PIN 25) IS GND, MUST BE SOLDERED TO PCB
ELECTRICAL CHARACTERISTICS
TC = 25°C, VCC = 5V, EN = 5V, EDC = EIP2 = 0V, REF = IP2I = IP2Q = DCOI =
DCOQ = 0.5V, PRF = –5dBm (–5dBm/tone for 2-tone IIP2 and IIP3 tests), PLO = 6dBm, unless otherwise noted. (Notes 2, 3, 5, 6, 9)
ORDER INFORMATION
LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC5585IUF#PBF LTC5585IUF#TRPBF 5585 24-Lead (4mm x 4mm) Plastic QFN –40°C to 105°C
Consult LTC Marketing for parts specified with wider operating temperature ranges.
Consult LTC Marketing for information on non-standard lead based finish parts.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
fRF(RANGE) RF Input Frequency Range (Note 12) 0.4 to 4.0 GHz
fLO(RANGE) LO Input Frequency Range (Note 12) 0.4 to 4.0 GHz
PLO(RANGE) LO Input Power Range (Note 12) 0 to 10 dBm
fRF1 = 700MHz, fRF2 = 701MHz, fLO = 690MHz, L6 = 2.7pF, C19 = 1.0pF, L5 = 12nH, C14 = 5.6pF
fRF(MATCH) RF Input Frequency Range Return Loss > 10dB 680 to 870 MHz
fLO(MATCH) LO Input Frequency Range Return Loss > 10dB 690 to 820 MHz
GVVoltage Conversion Gain Loaded with 100Ω Pull-Up (Note 8) 2.0 dB
NF Noise Figure Double-Side Band (Note 4) 13.5 dB
NFBLOCKING Noise Figure Under Blocking Conditions Double-Side Band, PRF = 0dBm (Note 7) 15.5 dB
IIP3 Input 3rd Order Intercept 28.7 dBm
IIP2 Input 2nd Order Intercept Unadjusted, EIP2 = 0V 70 dBm
IIP2OPT Optimized Input 2nd Order Intercept EIP2 = 5V, IP2I, IP2Q Adjusted for Minimum IM2 80 dBm
P1dB Input 1dB Compression 16 dBm
LTC5585
LTC5585
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For more information www.linear.com/LTC5585
ELECTRICAL CHARACTERISTICS
TC = 25°C, VCC = 5V, EN = 5V, EDC = EIP2 = 0V, REF = IP2I = IP2Q = DCOI =
DCOQ = 0.5V, PRF = –5dBm (–5dBm/tone for 2-tone IIP2 and IIP3 tests), PLO = 6dBm, unless otherwise noted. (Notes 2, 3, 5, 6, 9)
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
DCOFFSET DC Offset at I/Q Outputs Unadjusted, EDC = 0V (Note 13) 4 mV
G I/Q Gain Mismatch 0.05 dB
∆φ I/Q Phase Mismatch 0.3 Deg
IRR Image Rejection Ratio (Note 10) 48 dB
LO-RF LO to RF Leakage –64 dBm
RF-LO RF to LO Isolation 60 dB
fRF1 = 1950MHz, fRF2 = 1951MHz, fLO = 1940MHz, L6 = 1.2pF, C19 = 5.1nH, L5 = 1.0pF, C13 = 5.1nH
fRF(MATCH) RF Input Frequency Range Return Loss > 10dB 1.6 to 2.1 GHz
fLO(MATCH) LO Input Frequency Range Return Loss > 10dB 1.85 to 2.05 GHz
GVVoltage Conversion Gain Loaded with 100Ω Pull-Up (Note 8) 2.4 dB
NF Noise Figure Double-Side Band (Note 4) 12.7 dB
IIP3 Input 3rd Order Intercept 25.7 dBm
IIP2 Input 2nd Order Intercept Unadjusted, EIP2 = 0V 60 dBm
IIP2OPT Optimized Input 2nd Order Intercept EIP2 = 5V, IP2I, IP2Q Adjusted for Minimum IM2 80 dBm
P1dB Input 1dB Compression 16 dBm
DCOFFSET DC Offset at I/Q Outputs Unadjusted, EDC = 0V (Note 13) 7 mV
G I/Q Gain Mismatch 0.05 dB
∆φ I/Q Phase Mismatch 0.7 Deg
IRR Image Rejection Ratio (Note 10) 43 dB
LO-RF LO to RF Leakage –49 dBm
RF-LO RF to LO Isolation 58 dB
fRF1 = 2150MHz, fRF2 = 2151MHz, fLO = 2140MHz, C17 = 1.5pF, L6 = 4.7nH, C19 = 0.5pF, L5 = 5.1nH, C14 = 0.7pF
fRF(MATCH) RF Input Frequency Range Return Loss > 10dB 2.03 to 2.36 GHz
fLO(MATCH) LO Input Frequency Range Return Loss > 10dB 2.05 to 2.18 GHz
GVVoltage Conversion Gain Loaded with 100Ω Pull-Up (Note 8) 2.3 dB
NF Noise Figure Double-Side Band (Note 4) 13.0 dB
NFBLOCKING Noise Figure Under Blocking Conditions Double-Side Band, PRF = 0dBm (Note 7) 14.6 dB
IIP3 Input 3rd Order Intercept 25.9 dBm
IIP2 Input 2nd Order Intercept Unadjusted, EIP2 = 0V 56 dBm
IIP2OPT Optimized Input 2nd Order Intercept EIP2 = 5V, IP2I, IP2Q Adjusted for Minimum IM2 80 dBm
P1dB Input 1dB Compression 15 dBm
DCOFFSET DC Offset at I/Q Outputs Unadjusted, EDC = 0V (Note 13) 6 mV
G I/Q Gain Mismatch 0.05 dB
∆φ I/Q Phase Mismatch 1.0 Deg
IRR Image Rejection Ratio (Note 10) 40 dB
LO-RF LO to RF Leakage –50 dBm
RF-LO RF to LO Isolation 60 dB
fRF1 = 2600MHz, fRF2 = 2601MHz, fLO = 2590MHz, C17 = 0.5pF, L6 = 2.7nH, L5 = 1.2nH, C14 = 1pF
fRF(MATCH) RF Input Frequency Range Return Loss > 10dB 2.35 to 3.1 GHz
fLO(MATCH) LO Input Frequency Range Return Loss > 10dB 2.47 to 2.65 GHz
GVVoltage Conversion Gain Loaded with 100Ω Pull-Up (Note 8) 2.3 dB
LTC5585
LTC5585
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For more information www.linear.com/LTC5585
ELECTRICAL CHARACTERISTICS
TC = 25°C, VCC = 5V, EN = 5V, EDC = EIP2 = 0V, REF = IP2I = IP2Q = DCOI =
DCOQ = 0.5V, PRF = –5dBm (–5dBm/tone for 2-tone IIP2 and IIP3 tests), PLO = 6dBm, unless otherwise noted. (Notes 2, 3, 5, 6, 9)
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
NF Noise Figure Double-Side Band (Note 4) 13.6 dB
NFBLOCKING Noise Figure Under Blocking Conditions Double-Side Band, PRF = 0dBm (Note 7) 15.2 dB
IIP3 Input 3rd Order Intercept 27.5 dBm
IIP2 Input 2nd Order Intercept Unadjusted, EIP2 = 0V 60 dBm
IIP2OPT Minimum Input 2nd Order Intercept EIP2 = 5V, IP2I, IP2Q Adjusted for Minimum IM2 80 dBm
P1dB Input 1dB Compression 15.5 dBm
DCOFFSET DC Offset at I/Q Outputs Unadjusted, EDC = 0V (Note 13) 8 mV
G I/Q Gain Mismatch 0.05 dB
∆φ I/Q Phase Mismatch 1.0 Deg
IRR Image Rejection Ratio (Note 10) 40 dB
LO-RF LO to RF Leakage –46 dBm
RF-LO RF to LO Isolation 55 dB
fRF1 = 3500MHz, fRF2 = 3501MHz, fLO = 3490MHz, C17 = 0.6pF, L6 = 1.0nH, C13 = 0.7pF, L5 = Short, C14 = Open, Single-Ended LO (See Figure 14)
fRF(MATCH) RF Input Frequency Range Return Loss > 10dB 2.88 to 3.97 GHz
fLO(MATCH) LO Input Frequency Range Return Loss > 10dB 2.97 to 3.96 GHz
GVVoltage Conversion Gain Loaded with 100Ω Pull-Up (Note 8) 0.3 dB
NF Noise Figure Double-Side Band (Note 4) 17.1 dB
IIP3 Input 3rd Order Intercept 28.1 dBm
IIP2 Input 2nd Order Intercept Unadjusted, EIP2 = 0V 52.5 dBm
IIP2OPT Minimum Input 2nd Order Intercept EIP2 = 5V, IP2I, IP2Q Adjusted for Minimum IM2 65.9 dBm
P1dB Input 1dB Compression 17.1 dBm
DCOFFSET DC Offset at I/Q Outputs Unadjusted, EDC = 0V (Note 13) 16.5 mV
G I/Q Gain Mismatch 0.04 dB
∆φ I/Q Phase Mismatch 1.8 Deg
IRR Image Rejection Ratio (Note 10) 36 dB
LO-RF LO to RF Leakage –34.7 dBm
RF-LO RF to LO Isolation 44.5 dB
Power Supply and Other Parameters
VCC Supply Voltage 4.75 5.0 5.25 V
ICC Supply Current EDC = EIP2 = 5V 180 200 220 mA
ICC(LOW) Supply Current EDC = EIP2 = 0V 170 190 210 mA
ICC(OFF) Shutdown Current EN < 0.3V 11 900 μA
tON Turn-On Time EN Transition from Logic Low to High (Note 14) 0.2 µs
tOFF Turn-Off Time EN Transition from Logic High to Low (Note 15) 0.8 µs
VEH EN, EDC, EIP2 Input High Voltage (On) 2.0 V
VEL EN, EDC, EIP2 Input Low Voltage (Off) 0.3 V
IENH EN Pin Input Current EN = 5.0V 52 μA
IEDCH EDC Pin Input Current EDC = 5.0V 33 μA
LTC5585
LTC5585
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For more information www.linear.com/LTC5585
ELECTRICAL CHARACTERISTICS
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: Tests are performed with the test circuit of Figure 1.
Note 3: The LTC5585 is guaranteed to be functional over the –40°C to
105°C case temperature operating range.
Note 4: DSB noise figure is measured at the baseband frequency of 15MHz
with a small-signal noise source without any filtering on the RF input and
no other RF signal applied.
Note 5: Performance at the RF frequencies listed is measured with external
RF and LO impedance matching, as shown in the table of Figure 1.
Note 6: The complementary outputs (I+, I and Q+, Q) are combined
using a 180° phase-shift combiner.
Note 7: Noise figure under blocking conditions (NFBLOCKING) is measured
at an output frequency of 60MHz with RF input signal at fLO + 1MHz. Both
RF and LO input signals are appropriately filtered, as well as the baseband
output. NFBLOCKING measured at 840MHz, 2140MHz and 2500MHz only.
Note 8: Voltage conversion gain is calculated from the average measured
power conversion gain of the I and Q outputs using the test circuit shown
in Figure 1. Power conversion gain is measured with a 100Ω differential
load impedance on the I and Q outputs.
Note 9: Baseband outputs have a 100Ω external pull-up resistor to VCC as
shown in the test circuit shown in Figure 1.
Note 10: Image rejection is calculated from the measured gain error and
phase error using the method listed in the appendix.
Note 11: The DCOI, DCOQ, IP2I, IP2Q pins have an 8k internal resistor to
ground. The REF pin has a 2k internal resistor to ground. If unconnected,
these pins will float up to 500mV through internal current sources. A low
output resistance voltage source is recommended for driving these pins.
Note 12: This is the recommended operating range, operation outside the
listed range is possible with degraded performance to some parameters.
Note 13: DC offset measured differentially between I+ and I and between
Q+ and Q. The reported value is the mean of the absolute values of the
characterization data distribution.
Note 14: Baseband amplitude is within 10% of final value.
Note 15: Baseband amplitude is at least 30dB down from its on state.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
IEIP2H EIP2 Pin Input Current EIP2 = 5.0V 50 μA
VREF REF Pin Voltage With REF Pin Unloaded 0.5 V
VREF(RANGE) REF Pin Voltage Range When Driven with External Source 0.4 to 0.7 V
ZREF REF Input Impedance (Note 11) 2||1 kΩ||pF
DCOI, DCOQ, IP2I, IP2Q Pin Voltage Unloaded 0.5 V
DCOI, DCOQ, IP2I, IP2Q Voltage Range When Driven with External Source 0 to 2VREF V
DCOI, DCOQ, IP2I, IP2Q Impedance (Note 11) 8||1 kΩ||pF
DCOI, DCOQ, IP2I, IP2Q Settling Time For Step Input, Output with 90% of Final Value 20 ns
DC Offset Adjustment Range DCOI, DCOQ Swept from 0V to 1V, EDC = 5V ±20 mV
DC Offset Drift Over Temperature Unadjusted, EDC = 0V 20 μV/°C
VCM I+, I, Q+, Q Common Mode Voltage VCC – 1.5 V
ZOUT I+, I, Q+, Q Output Impedance Single Ended 100||6 Ω||pF
BWBB I+, I, Q+, Q Output Bandwidth 100Ω External Pull-Up, –3dB Corner Frequency 530 MHz
LTC5585 250 55a SUPPLY CURRENT (MA) REFVULTAGE (mV) dB (dam) IIPS (dam) IIPS‘ 6 L7HCU§QB
LTC5585
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DC PERFORMANCE CHARACTERISTICS
TYPICAL PERFORMANCE CHARACTERISTICS
IIP3, P1dB vs Temperature (TC) IIP3, P1dB vs Supply Voltage (VCC) IIP3 vs LO Power
Supply Current vs Supply Voltage REF Voltage vs Temperature
EN = 5V, EDC = 0V and EIP2 = 0V. Test circuit shown in Figure 1
700MHz application. VCC = 5V, EN = 5V, EDC = 0V,
EIP2 = 0V, REF = 0.5V, TC = 25°C, PLO = 6dBm, fLO = 690MHz, fRF1 = 700MHz, fRF2 = 701MHz, fBB = 10MHz, PRF1 = PRF2 = –5dBm,
DC Blocks and Mini-Circuits PSCJ-2-1 180° combiner at baseband outputs de-embedded from measurement unless otherwise noted.
Test circuit with RF and LO ports impedance matched as in Figure 1.
SUPPLY VOLTAGE (V)
4.75
160
SUPPLY CURRENT (mA)
170
190
200
210
260
230
5
5585 G01
180
240
250
220
5.25
TC = –40°C
TC = 25°C
TC = 85°C
TC = 105°C
TEMPERATURE (°C)
40
500
REF VOLTAGE (mV)
505
515
520
525
550
535
040 60 80
5585 G02
510
540
545
530
20 20 100
VCC = 4.75V
VCC = 5V
VCC = 5.25V
LO FREQUENCY (MHz)
600
10
14
22
26
30
38
700 800
18
42
46
34
900
I, –40°C
I, 25°C
I, 85°C
I, 105°C
Q, –40°C
Q, 25°C
Q, 85°C
Q, 105°C
IIP3
P1dB
LO FREQUENCY (MHz)
600
10
IIP3, P1dB (dBm)
14
22
26
30
50
TC = 25°C
38
700 800
5585 G04
18
42
46
34
900
1000
I, 4.75V
I, 5.0V
I, 5.25V
Q, 4.75V
Q, 5.0V
Q, 5.25V
IIP3
P1dB
LO FREQUENCY (MHz)
600
10
14
22
26
30
TC = 25°C
38
700 800
18
42
46
34
900
I, 0dBm
I, 6dBm
I, 10dBm
Q, 0dBm
Q, 6dBm
Q, 10dBm
LTC5585 m ‘20 .53 E: .53 S: me me V20 as WEE: wmaz mma as 5 2.5 as 5 :5 L7 HEW
LTC5585
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5585fb
For more information www.linear.com/LTC5585
TYPICAL PERFORMANCE CHARACTERISTICS
IIP2 vs IP2I, IP2Q Trim Voltage IIP2 vs RF Tone Spacing
2x2 Half-IF IIP2
vs RF to LO Tone Spacing
Noise Figure and Conversion
Gain vs LO Power
Noise Figure and Conversion
Gain vs Temperature (TC)
2-Tone IIP3 vs RF Power
Uncalibrated IIP2 vs Temperature
(TC)
Noise Figure vs RF Power and
IP2I, IP2Q Trim Voltage
Uncalibrated IIP2 vs LO Power
700MHz application. VCC = 5V, EN = 5V, EDC = 0V,
EIP2 = 0V, REF = 0.5V, TC = 25°C, PLO = 6dBm, fLO = 690MHz, fRF1 = 700MHz, fRF2 = 701MHz, fBB = 10MHz, PRF1 = PRF2 = –5dBm,
DC Blocks and Mini-Circuits PSCJ-2-1 180° combiner at baseband outputs de-embedded from measurement unless otherwise noted.
Test circuit with RF and LO ports impedance matched as in Figure 1.
RF POWER (dBm)
–10
IIP3 (dBm)
38
44
50
48
46
40
42
34
36
28
30
22
24
–4 0 2 4
5585 G06
32
26
20 –8 –6 –2
I, –40°C
I, 25°C
I, 85°C
I, 105°C
Q, –40°C
Q, 25°C
Q, 85°C
Q, 105°C
fRF1 = 700MHz
fRF2 = 701MHz
fLO = 690MHz
LO FREQUENCY (MHz)
600
IIP2 (dBm)
90
100
110
900
5585 G07
80
70
700 800
1000
60
50
120
I, –40°C
I, 25°C
I, 85°C
I, 105°C
Q, –40°C
Q, 25°C
Q, 85°C
Q, 105°C
LO FREQUENCY (MHz)
600
IIP2 (dBm)
90
100
110
900
5585 G08
80
70
700 800
1000
60
50
120
TC = 25°C
I, 0dBm
I, 6dBm
I, 10dBm
Q, 0dBm
Q, 6dBm
Q, 10dBm
RF TONE SPACING (MHz)
0
IIP2 (dBm)
70
85
90
400
5585 G10
65
60
40 100 200 300
50 150 250 350
50
100
95
80
75
55
45
I (UNCALIBRATED)
I (NULLED AT 1MHz)
Q (UNCALIBRATED)
Q (NULLED AT 1MHz)
TC = 25°C
fRF1 = 700MHz
fLO = 690MHz
RF TO LO TONE SPACING (MHz)
0
50
IIP2 (dBm)
55
65
70
75
100
85
100 200 250
5585 G11
60
90
95
80
50 150 300 350
400
TC = 25°C
fLO = 690MHz
Q
I
LO FREQUENCY (MHz)
600
–4
GAIN, NF (dB)
0
4
8
24
16
700 900
20
12
–2
2
6
22
14
18
10
800
1000
5585 G12
I, –40°C
I, 25°C
I, 85°C
I, 105°C
Q, –40°C
Q, 25°C
Q, 85°C
Q, 105°C
NF
GAIN
LO FREQUENCY (MHz)
600
–4
GAIN, NF (dB)
0
4
8
24
16
700 900
20
12
–2
2
6
22
14
18
10
800
1000
5585 G13
I, 0dBm
I, 6dBm
I, 10dBm
Q, 0dBm
Q, 6dBm
Q, 10dBm
TC = 25°C
NF
GAIN
IP2I, IP2Q TRIM VOLTAGE (V)
0
DSB NOISE FIGURE (dB)
16
18
20
0.8
5585 G14
14
12
15
17
19
13
11
10 0.20.1 0.40.3 0.6 0.7 0.9
0.5
1.0
I, –20dBm
I, 0dBm Q, –20dBm
Q, 0dBm
TC = 25°C
fRF = 890MHz
fLO = 900MHz
fNOISE = 3.4MHz
EIP2 = 5V
IP2I, IP2Q (V)
0
IIP2 (dBm)
80
90
100
0.8 0.9
5585 G09
70
60
40 0.2 0.4 0.6
0.1
1.0
0.3 0.5 0.7
50
120
fRF = 700MHz
110
I, –40°C
I, 25°C
I, 85°C
I, 105°C
Q, –40°C
Q, 25°C
Q, 85°C
Q, 105°C
LTC5585 $5 GEE E 33 5:83! 5%. as $3: as: an as 22587 :55 $523 as WEE: $62 an Stage 8 L7HCU§QB
LTC5585
8
5585fb
For more information www.linear.com/LTC5585
TYPICAL PERFORMANCE CHARACTERISTICS
DC Offset vs LO Power
Noise Figure vs RF Input Power
with fNOISE = 60MHz
DC Offset vs DCOI, DCOQ Control
Voltage
Noise Figure vs RF Input Power
with fNOISE = 3.4MHz
LO to RF Leakage and RF to LO
Isolation
Image Rejection vs Temperature
(Note 10)
700MHz application. VCC = 5V, EN = 5V, EDC = 0V,
EIP2 = 0V, REF = 0.5V, TC = 25°C, PLO = 6dBm, fLO = 690MHz, fRF1 = 700MHz, fRF2 = 701MHz, fBB = 10MHz, PRF1 = PRF2 = –5dBm,
DC Blocks and Mini-Circuits PSCJ-2-1 180° combiner at baseband outputs de-embedded from measurement unless otherwise noted.
Test circuit with RF and LO ports impedance matched as in Figure 1.
RF INPUT POWER (dBm)
–20
DSB NOISE FIGURE (dB)
19
22
25
24
23
20
21
17
18
14
15
11
12
–5 5 10
5585 G15
16
13
10 –15 –10 0
PLO = 0dBm
PLO = 6dBm
PLO = 10dBm
TC = 25°C
fLO = 840MHz
fRF = 841MHz
fNOISE = 60MHz
RF INPUT POWER (dBm)
–20
DSB NOISE FIGURE (dB)
19
22
25
24
23
20
21
17
18
14
15
11
12
–5 5 10
5585 G16
16
13
10 –15 –10 0
PLO = 0dBm
PLO = 6dBm
PLO = 10dBm
TC = 25°C
fLO = 900MHz
fRF = 890MHz
fNOISE = 3.4MHz
DCOI, DCOQ (V)
0
–25
DC OFFSET (mV)
–20
–10
–5
0
25
30
35
40
10
0.2 0.4
5585 G17
–15
15
20
5
0.6 1.00.8
0.1 0.3 0.5 0.7 0.9
I, –40°C
I, 25°C
I, 85°C
I, 105°C
Q, –40°C
Q, 25°C
Q, 85°C
Q, 105°C
fLO = 700MHz
LO FREQUENCY (MHz)
600
DC OFFSET (mV)
4
7
10
9
8
5
6
2
3
–1
0
–4
–3
750 850 900 950
1000
5585 G18
1
–2
–5 650 700 800
I, 0dBm
I, 6dBm
I, 10dBm
Q, 0dBm
Q, 6dBm
Q, 10dBm
TC = 25°C
LO FREQUENCY (MHz)
600
–100
LEAKAGE (dBm), –ISOLATION (dB)
–90
–80
–70
–30
–50
650 700 850 900 950
–40
–60
–95
–85
–75
–35
–55
–45
–65
750 800
1000
5585 G19
L-R, –40°C
L-R, 25°C
L-R, 85°C
L-R, 105°C
R-L, –40°C
R-L, 25°C
R-L, 85°C
R-L, 105°C
LO FREQUENCY (MHz)
600
IMAGE REJECTION (dB)
60
80
1000
5585 G20
40
20 700 800 900
650 750 850 950
100
50
70
30
90
TC = –40°C
TC = 25°C
TC = 85°C
TC = 105°C
LTC5585 IIPS‘ PmB (flBm) E E E we me E E E wzo __ we we V =195DMHZ E E g E L7 LJDE/ég 9
LTC5585
9
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For more information www.linear.com/LTC5585
TYPICAL PERFORMANCE CHARACTERISTICS
1950MHz application. VCC = 5V, EN = 5V, EDC = 0V,
REF = 0.5V, EIP2 = 0V, TC = 25°C, PLO = 6dBm, fLO = 1940MHz, fRF1 = 1950MHz, fRF2 = 1951MHz, fBB = 10MHz, PRF1 = PRF2 = –5dBm,
DC Blocks and Mini-Circuits PSCJ-2-1 180° combiner at baseband outputs de-embedded from measurement unless otherwise noted.
Test circuit with RF and LO ports impedance matched as in Figure 1.
2-Tone IIP3 vs RF Power
2x2 Half-IF IIP2
vs RF to LO Tone Spacing
Uncalibrated IIP2 vs Temperature
(TC) Uncalibrated IIP2 vs LO Power
IIP2 vs IP2I, IP2Q Trim Voltage IIP2 vs RF Tone Spacing
IIP3, P1dB vs Temperature (TC) IIP3, P1dB vs Supply Voltage IIP3 vs LO Power
LO FREQUENCY (MHz)
1500
10
IIP3, P1dB (dBm)
14
22
26
30
50
38
1700 1900 2000 2100
5585 G21
18
42
46
34
1600 1800
2200
I, –40°C
I, 25°C
I, 85°C
I, 105°C
Q, –40°C
Q, 25°C
Q, 85°C
Q, 105°C
IIP3
P1dB
LO FREQUENCY (MHz)
1500
10
IIP3, P1dB (dBm)
14
22
26
30
50
38
1700 1900 2000 2100
5585 G22
18
42
46
34
1600 1800
2200
I, 4.75V
I, 5.0V
I, 5.25V
Q, 4.75V
Q, 5.0V
Q, 5.25V
TC = 25°C
IIP3
P1dB
LO FREQUENCY (MHz)
1500
10
IIP3 (dBm)
14
22
26
30
50
38
1700 1900 2000 2100
5585 G23
18
42
46
34
1600 1800
2200
I, 0dBm
I, 6dBm
I, 10dBm
Q, 0dBm
Q, 6dBm
Q, 10dBm
TC = 25°C
RF POWER (dBm)
–10
IIP3 (dBm)
38
44
50
48
46
40
42
34
36
28
30
22
24
–4 0 2 4
5585 G24
32
26
20 –8 –6 –2
I, –40°C
I, 25°C
I, 85°C
I, 105°C
Q, –40°C
Q, 25°C
Q, 85°C
Q, 105°C
fRF1 = 1950MHz
fRF2 = 1951MHz
fLO = 1940MHz
LO FREQUENCY (MHz)
1500
40
IIP2 (dBm)
50
70
80
90
1900
130
5585 G25
60
1700
1600 2000 2100
1800
2200
100
110
120
I, –40°C
I, 25°C
I, 85°C
I, 105°C
Q, –40°C
Q, 25°C
Q, 85°C
Q, 105°C
LO FREQUENCY (MHz)
1500
40
IIP2 (dBm)
50
70
80
90
1900
130
5585 G26
60
1700
1600 2000 2100
1800
2200
100
110
120
I, 0dBm
I, 6dBm
I, 10dBm
Q, 0dBm
Q, 6dBm
Q, 10dBm
TC = 25°C
IP2I, IP2Q (V)
0
IIP2 (dBm)
80
90
100
0.8 0.9
5585 G27
70
60
40 0.2 0.4 0.6
0.1
1.0
0.3 0.5 0.7
50
120
fRF = 1950MHz
110
I, –40°C
I, 25°C
I, 85°C
I, 105°C
Q, –40°C
Q, 25°C
Q, 85°C
Q, 105°C
RF TONE SPACING (MHz)
0
IIP2 (dBm)
70
85
90
400
5585 G28
65
60
40 100 200 300
50 150 250 350
50
100
95
80
75
55
45
I (UNCALIBRATED)
I (NULLED AT 1MHz)
Q (UNCALIBRATED)
Q (NULLED AT 1MHz)
TC = 25°C
fRF1 = 1950MHz
fLO = 1940MHz
RF TO LO TONE SPACING (MHz)
0
50
IIP2 (dBm)
55
65
70
75
100
85
100 200 250
5585 G29
60
90
95
80
50 150 300 350
400
TC = 25°C
fLO = 1940MHz
Q
I
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For more information www.linear.com/LTC5585
TYPICAL PERFORMANCE CHARACTERISTICS
1950MHz application. VCC = 5V, EN = 5V, EDC = 0V,
REF = 0.5V, EIP2 = 0V, TC = 25°C, PLO = 6dBm, fLO = 1940MHz, fRF1 = 1950MHz, fRF2 = 1951MHz, fBB = 10MHz, PRF1 = PRF2 = –5dBm,
DC Blocks and Mini-Circuits PSCJ-2-1 180° combiner at baseband outputs de-embedded from measurement unless otherwise noted.
Test circuit with RF and LO ports impedance matched as in Figure 1.
Noise Figure and Conversion
Gain vs Temperature (TC)
Noise Figure and Conversion
Gain vs LO Power
DC Offset vs DCOI, DCOQ Control
Voltage
LO to RF Leakage and RF to LO
IsolationDC Offset vs LO Power
Image Rejection vs Temperature
(Note 10)
LO FREQUENCY (MHz)
1500
–4
GAIN, NF (dB)
0
4
8
24
16
1600 1800 1900 2000 2100
20
12
–2
2
6
22
14
18
10
1700
2200
5585 G30
NF
GAIN
I, –40°C
I, 25°C
I, 85°C
I, 105°C
Q, –40°C
Q, 25°C
Q, 85°C
Q, 105°C
LO FREQUENCY (MHz)
1500
–4
GAIN, NF (dB)
0
4
8
24
16
1600 1800 1900 2000 2100
20
12
–2
2
6
22
14
18
10
1700
2200
5585 G31
I, 0dBm
I, 6dBm
I, 10dBm
Q, 0dBm
Q, 6dBm
Q, 10dBm
TC = 25°C
NF
GAIN
DCOI, DCOQ (V)
0
–25
DC OFFSET (mV)
–20
–10
–5
0
25
30
35
40
10
0.2 0.4
5585 G32
–15
15
20
5
0.6 1.00.8
0.1 0.3 0.5 0.7 0.9
I, –40°C
I, 25°C
I, 85°C
I, 105°C
Q, –40°C
Q, 25°C
Q, 85°C
Q, 105°C
fLO = 1950MHz
LO FREQUENCY (MHz)
1500
DC OFFSET (mV)
9
12
15
14
13
10
11
7
8
4
5
1
2
1800 2000
2200
2100
5585 G33
6
3
01600 1700 1900
I, 0dBm
I, 6dBm
I, 10dBm
Q, 0dBm
Q, 6dBm
Q, 10dBm
TC = 25°C
LO FREQUENCY (MHz)
1500
–90
LEAKAGE (dBm), –ISOLATION (dB)
–80
–70
–60
–20
–40
1600 1700 2000 2100
–30
–50
–85
–75
–65
–25
–45
–35
–55
1800 1900
2200
5585 G34
L-R, –40°C
L-R, 25°C
L-R, 85°C
L-R, 105°C
R-L, –40°C
R-L, 25°C
R-L, 85°C
R-L, 105°C
LO FREQUENCY (MHz)
1500
IMAGE REJECTION (dB)
60
80
2200
5585 G35
40
20 1700 1900 2100
1600 1800 2000
100
50
70
30
90
TC = –40°C
TC = 25°C
TC = 85°C
TC = 105°C
Conversion Gain Distribution IIP3 Distribution, I Side IIP3 Distribution, Q Side
CONVERSION GAIN (dB)
2 2.2
PERCENTAGE DISTRIBUTION (%)
20
30
5585 G36
10
02.4 2.6 2.8 3.0 3.2
50
40
TC = –40°C
TC = 25°C
TC = 85°C
TC = 105°C
IIP3 (dBm)
20
PERCENTAGE DISTRIBUTION (%)
60
80
100
28
5585 G37
40
20
50
70
90
30
10
022 24 26 30 32
TC = –40°C
TC = 25°C
TC = 85°C
TC = 105°C
IIP3 (dBm)
20
PERCENTAGE DISTRIBUTION (%)
60
80
100
28
5585 G38
40
20
50
70
90
30
10
022 24 26 30 32
TC = –40°C
TC = 25°C
TC = 85°C
TC = 105°C
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For more information www.linear.com/LTC5585
TYPICAL PERFORMANCE CHARACTERISTICS
1950MHz application. VCC = 5V, EN = 5V, EDC = 0V,
REF = 0.5V, EIP2 = 0V, TC = 25°C, PLO = 6dBm, fLO = 1940MHz, fRF1 = 1950MHz, fRF2 = 1951MHz, fBB = 10MHz, PRF1 = PRF2 = –5dBm,
DC Blocks and Mini-Circuits PSCJ-2-1 180° combiner at baseband outputs de-embedded from measurement unless otherwise noted.
Test circuit with RF and LO ports impedance matched as in Figure 1.
Phase Error Distribution
Image Rejection Distribution
(Note 10)
DSB Noise Figure Distribution,
I Side
DSB Noise Figure Distribution,
Q Side IIP2 Distribution, I Side
IIP2 Distribution, Q Side Gain Error Distribution
DSB NOISE FIGURE (dB)
11
PERCENTAGE DISTRIBUTION (%)
60
80
100
15
5585 G39
40
20
50
70
90
30
10
012 13 14 16 17
TC = –40°C
TC = 25°C
TC = 85°C
TC = 105°C
DSB NOISE FIGURE (dB)
11
PERCENTAGE DISTRIBUTION (%)
60
80
100
15
5585 G40
40
20
50
70
90
30
10
012 13 14 16 17
TC = –40°C
TC = 25°C
TC = 85°C
TC = 105°C
IIP2 (dBm)
70
PERCENTAGE DISTRIBUTION (%)
60
80
100
90
5585 G41
40
20
50
70
90
30
10
075 80 85 95 100
TC = –40°C
TC = 25°C
TC = 85°C
TC = 105°C
IIP2 (dBm)
70
PERCENTAGE DISTRIBUTION (%)
60
80
100
90
5585 G42
40
20
50
70
90
30
10
075 80 85 95
100
TC = –40°C
TC = 25°C
TC = 85°C
TC = 105°C
GAIN ERROR (dB)
–0.1
0
PERCENTAGE DISTRIBUTION (%)
10
30
40
50
70
5585 G43
20
60
–0.02 0.1
–0.06 0.02 0.06
TC = –40°C
TC = 25°C
TC = 85°C
TC = 105°C
PHASE ERROR (DEGREES)
–1
0
PERCENTAGE DISTRIBUTION (%)
20
30
5585 G44
10
–0.6 0
–0.8 –0.4 –0.2
TC = –40°C
TC = 25°C
TC = 85°C
TC = 105°C
IMAGE REJECTION (dB)
40
0
PERCENTAGE DISTRIBUTION (%)
10
30
40
50
45 50 52.5 60
5585 G45
20
42.5 47.5 55 57.5
TC = –40°C
TC = 25°C
TC = 85°C
TC = 105°C
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LTC5585
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For more information www.linear.com/LTC5585
TYPICAL PERFORMANCE CHARACTERISTICS
2150MHz application. VCC = 5V, EN = 5V,
EDC = 0V, EIP2 = 0V, REF = 0.5V, TC = 25°C, PLO = 6dBm, fLO = 2140MHz, fRF1 = 2150MHz, fRF2 = 2151MHz, fBB = 10MHz,
PRF1 = PRF2 = –5dBm, DC Blocks and Mini-Circuits PSCJ-2-1 180° combiner at baseband outputs de-embedded from measurement
unless otherwise noted. Test circuit with RF and LO ports impedance matched as in Figure 1.
IIP3, P1dB vs Temperature (TC)
IIP3, P1dB vs Supply Voltage
(VCC)IIP3 vs LO Power
LO FREQUENCY (MHz)
1750
10
IIP3, P1dB (dBm)
14
22
26
30
50
38
1950 2150 2250
5585 G46
18
42
46
34
1850 2050 2350 2450
2550
I, –40°C
I, 25°C
I, 85°C
I, 105°C
Q, –40°C
Q, 25°C
Q, 85°C
Q, 105°C
IIP3
P1dB
LO FREQUENCY (MHz)
1750
10
IIP3, P1dB (dBm)
14
22
26
30
50
38
1950 2150 2250
5585 G47
18
42
46
34
1850 2050 2350 2450
2550
I, 4.75V
I, 5.0V
I, 5.25V
Q, 4.75V
Q, 5.0V
Q, 5.25V
TC = 25°C
IIP3
P1dB
LO FREQUENCY (MHz)
1750
10
IIP3 (dBm)
14
22
26
30
50
38
1950 2150 2250
5585 G48
18
42
46
34
1850 2050 2350 2450
2550
I, 0dBm
I, 6dBm
I, 10dBm
Q, 0dBm
Q, 6dBm
Q, 10dBm
TC = 25°C
2-Tone IIP3 vs RF Power
Uncalibrated IIP2 vs Temperature
(TC) Uncalibrated IIP2 vs LO Power
RF POWER (dBm)
–10
IIP3 (dBm)
38
44
50
48
46
40
42
34
36
28
30
22
24
–4 0 2 4
5585 G49
32
26
20 –8 –6 –2
I, –40°C
I, 25°C
I, 85°C
I, 105°C
Q, –40°C
Q, 25°C
Q, 85°C
Q, 105°C
fRF1 = 2150MHz
fRF2 = 2151MHz
fLO = 2140MHz
LO FREQUENCY (MHz)
1750
40
IIP2 (dBm)
50
70
80
90
2150
130
5585 G50
60
1950
1850 2250 2350 2450
2050
2550
100
110
120
I, –40°C
I, 25°C
I, 85°C
I, 105°C
Q, –40°C
Q, 25°C
Q, 85°C
Q, 105°C
LO FREQUENCY (MHz)
1750
40
IIP2 (dBm)
50
70
80
90
2150
130
5585 G51
60
1950
1850 2250 2350 2450
2050
2550
100
110
120
I, 0dBm
I, 6dBm
I, 10dBm
Q, 0dBm
Q, 6dBm
Q, 10dBm
TC = 25°C
IIP2 vs IP2I, IP2Q Trim Voltage IIP2 vs RF Tone Spacing
2x2 Half-IF IIP2
vs RF to LO Tone Spacing
IP2I, IP2Q (V)
0
IIP2 (dBm)
80
90
100
0.8 0.9
5585 G52
70
60
40 0.2 0.4 0.6
0.1
1.0
0.3 0.5 0.7
50
120
fRF = 2150MHz
110
I, –40°C
I, 25°C
I, 85°C
I, 105°C
Q, –40°C
Q, 25°C
Q, 85°C
Q, 105°C
RF TONE SPACING (MHz)
0
IIP2 (dBm)
70
85
90
400
5585 G53
65
60
40 100 200 300
50 150 250 350
50
100
95
80
75
55
45
I (UNCALIBRATED)
I (NULLED AT 1MHz)
Q (UNCALIBRATED)
Q (NULLED AT 1MHz)
TC = 25°C
fRF1 = 2150MHz
fLO = 2140MHz
RF TO LO TONE SPACING (MHz)
0
50
IIP2 (dBm)
55
65
70
75
100
85
100 200 250
5585 G54
60
90
95
80
50 150 300 350
400
TC = 25°C
fLO = 2140MHz
Q
I
LTC5585 as #2 2.6 if: 25 as is: $5: an sémmto S Sémmto 8 as SEEK was; as 5:387 Ems $523 13 L7 HEW
LTC5585
13
5585fb
For more information www.linear.com/LTC5585
TYPICAL PERFORMANCE CHARACTERISTICS
2150MHz application. VCC = 5V, EN = 5V,
EDC = 0V, EIP2 = 0V, REF = 0.5V, TC = 25°C, PLO = 6dBm, fLO = 2140MHz, fRF1 = 2150MHz, fRF2 = 2151MHz, fBB = 10MHz,
PRF1 = PRF2 = –5dBm, DC Blocks and Mini-Circuits PSCJ-2-1 180° combiner at baseband outputs de-embedded from measurement
unless otherwise noted. Test circuit with RF and LO ports impedance matched as in Figure 1.
DC Offset vs DCOI, DCOQ Control
Voltage DC Offset vs LO Power
LO to RF Leakage and RF to LO
Isolation
Image Rejection vs Temperature
(Note 10)
Noise Figure vs RF Input Power
Noise Figure and Conversion
Gain vs Temperature (TC)
Noise Figure and Conversion
Gain vs LO Power
RF INPUT POWER (dBm)
–20
DSB NOISE FIGURE (dB)
19
22
25
24
23
20
21
17
18
14
15
11
12
–5 5 10
5585 G55
16
13
10 –15 –10 0
PLO = 0dBm
PLO = 6dBm
PLO = 10dBm
TC = 25°C
fLO = 2140MHz
fRF = 2141MHz
fNOISE = 60MHz
LO FREQUENCY (MHz)
1750 1850 1950 2050 2150 2250 2350 2450
2550
–4
GAIN, NF (dB)
0
4
8
24
16
20
12
–2
2
6
22
14
18
10
5585 G56
I, –40°C
I, 25°C
I, 85°C
I, 105°C
Q, –40°C
Q, 25°C
Q, 85°C
Q, 105°C
NF
GAIN
LO FREQUENCY (MHz)
1750 1850
–4
GAIN, NF (dB)
0
4
8
24
16
1950 2050 2150 2250 2350 2450
2550
20
12
–2
2
6
22
14
18
10
5585 G57
I, 0dBm
I, 6dBm
I, 10dBm
Q, 0dBm
Q, 6dBm
Q, 10dBm
TC = 25°C
NF
GAIN
DCOI, DCOQ (V)
0
–25
DC OFFSET (mV)
–20
–10
–5
0
25
30
35
40
10
0.2 0.4
5585 G58
–15
15
20
5
0.6 1.00.8
0.1 0.3 0.5 0.7 0.9
I, –40°C
I, 25°C
I, 85°C
I, 105°C
Q, –40°C
Q, 25°C
Q, 85°C
Q, 105°C
fLO = 2150MHz
LO FREQUENCY (MHz)
1750
–5
DC OFFSET (mV)
–3
1
3
5
15
9
1950 2150 2250
5585 G59
–1
11
13
7
1850 2050 2350 2450
2550
I, 0dBm
I, 6dBm
I, 10dBm
Q, 0dBm
Q, 6dBm
Q, 10dBm
TC = 25°C
LO FREQUENCY (MHz)
1750
–90
LEAKAGE (dBm), –ISOLATION (dB)
–80
–70
–60
–20
–40
1850 1950 2250 2350 2450
–30
–50
–85
–75
–65
–25
–45
–35
–55
2050 2150
2550
5585 G60
L-R, –40°C
L-R, 25°C
L-R, 85°C
L-R, 105°C
R-L, –40°C
R-L, 25°C
R-L, 85°C
R-L, 105°C
LO FREQUENCY (MHz)
1750
IMAGE REJECTION (dB)
60
80
2550
5585 G61
40
20 1950 2150 2350
1850 2050 2250 2450
100
50
70
30
90
TC = –40°C
TC = 25°C
TC = 85°C
TC = 105°C
LTC5585 953 E: :55 mu; 3.. .53 mm; .E: ‘30 ‘30 \ . ¢ _ s z 7 . 953 N2. :55 X: me me ‘2 m w ’ ; E3 2.. 255 E: .53 N2. L7HCU§QB 14
LTC5585
14
5585fb
For more information www.linear.com/LTC5585
TYPICAL PERFORMANCE CHARACTERISTICS
2600MHz application. VCC = 5V, EN = 5V, EDC = 0V,
EIP2 = 0V, REF = 0.5V, TC = 25°C, PLO = 6dBm, fLO = 2590MHz, fRF1 = 2600MHz, fRF2 = 2601MHz, fBB = 10MHz, PRF1 = PRF2 = –5dBm,
DC Blocks and Mini-Circuits PSCJ-2-1 180° combiner at baseband outputs de-embedded from measurement unless otherwise noted.
Test circuit with RF and LO ports impedance matched as in Figure 1.
2-Tone IIP3 vs RF Power Uncalibrated IIP2 vs LO Power
Uncalibrated IIP2 vs Temperature
(TC)
IIP2 vs IP2I, IP2Q Trim Voltage IIP2 vs RF Tone Spacing
2x2 Half-IF IIP2 vs RF to LO Tone
Spacing
IIP3, P1dB vs Temperature (TC) IIP3, P1dB vs Supply Voltage (VCC) IIP3 vs LO Power
LO FREQUENCY (MHz)
2200
10
IIP3, P1dB (dBm)
14
22
26
30
50
38
2400 2600 2700
5585 G62
18
42
46
34
2300 2500 2800 2900
3000
I, –40°C
I, 25°C
I, 85°C
I, 105°C
Q, –40°C
Q, 25°C
Q, 85°C
Q, 105°C
IIP3
P1dB
LO FREQUENCY (MHz)
2200
10
IIP3, P1dB (dBm)
14
22
26
30
50
38
2400 2600 2700
5585 G63
18
42
46
34
2300 2500 2800 2900
3000
I, 4.75V
I, 5.0V
I, 5.25V
Q, 4.75V
Q, 5.0V
Q, 5.25V
TC = 25°C
IIP3
P1dB
LO FREQUENCY (MHz)
2200
10
IIP3 (dBm)
14
22
26
30
50
38
2400 2600 2700
5585 G64
18
42
46
34
2300 2500 2800 2900
3000
I, 0dBm
I, 6dBm
I, 10dBm
Q, 0dBm
Q, 6dBm
Q, 10dBm
TC = 25°C
RF POWER (dBm)
–10
IIP3 (dBm)
38
44
50
48
46
40
42
34
36
28
30
22
24
–4 0 2 4
5585 G65
32
26
20 –8 –6 –2
I, –40°C
I, 25°C
I, 85°C
I, 105°C
Q, –40°C
Q, 25°C
Q, 85°C
Q, 105°C
fRF1 = 2600MHz
fRF2 = 2601MHz
fLO = 2590MHz
LO FREQUENCY (MHz)
2200
40
IIP2 (dBm)
50
70
80
90
130
100
2400 2600 2700
5585 G66
60
110
120
2300 2500 2800 2900
3000
I, –40°C
I, 25°C
I, 85°C
I, 105°C
Q, –40°C
Q, 25°C
Q, 85°C
Q, 105°C
LO FREQUENCY (MHz)
2200
40
IIP2 (dBm)
50
70
80
90
130
100
2400 2600 2700
5585 G66
60
110
120
2300 2500 2800 2900
3000
I, 0dBm
I, 6dBm
I, 10dBm
Q, 0dBm
Q, 6dBm
Q, 10dBm
TC = 25°C
IP2I, IP2Q (V)
0
IIP2 (dBm)
80
90
100
0.8 0.9
5585 G68
70
60
40 0.2 0.4 0.6
0.1
1.0
0.3 0.5 0.7
50
120
fRF = 2600MHz
110
I, –40°C
I, 25°C
I, 85°C
I, 105°C
Q, –40°C
Q, 25°C
Q, 85°C
Q, 105°C
RF TONE SPACING (MHz)
0
IIP2 (dBm)
70
85
90
400
5585 G69
65
60
40 100 200 300
50 150 250 350
50
100
95
80
75
55
45
I (UNCALIBRATED)
I (NULLED AT 1MHz)
Q (UNCALIBRATED)
Q (NULLED AT 1MHz)
TC = 25°C
fRF1 = 2600MHz
fLO = 2590MHz
RF TO LO TONE SPACING (MHz)
0
50
IIP2 (dBm)
55
65
70
75
100
85
100 200 250
5585 G70
60
90
95
80
50 150 300 350
400
TC = 25°C
fLO = 2590MHz
Q
I
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LTC5585
15
5585fb
For more information www.linear.com/LTC5585
Noise Figure vs RF Power and
IP2I, IP2Q Trim Voltage
DC Offset vs DCOI, DCOQ Control
Voltage DC Offset vs LO Power
LO to RF Leakage and RF to LO
Isolation
Image Rejection vs Temperature
(Note 10)
Noise Figure and Conversion
Gain vs LO Power
Noise Figure vs RF Input Power
Noise Figure and Conversion
Gain vs Temperature (TC)
TYPICAL PERFORMANCE CHARACTERISTICS
2600MHz application. VCC = 5V, EN = 5V, EDC = 0V,
EIP2 = 0V, REF = 0.5V, TC = 25°C, PLO = 6dBm, fLO = 2590MHz, fRF1 = 2600MHz, fRF2 = 2601MHz, fBB = 10MHz, PRF1 = PRF2 = –5dBm,
DC Blocks and Mini-Circuits PSCJ-2-1 180° combiner at baseband outputs de-embedded from measurement unless otherwise noted.
Test circuit with RF and LO ports impedance matched as in Figure 1.
LO FREQUENCY (MHz)
2200 2300 2400 2500 2600 2700 2800 2900
3000
–4
GAIN, NF (dB)
0
4
8
24
16
20
12
–2
2
6
22
14
18
10
5585 G71
I, –40°C
I, 25°C
I, 85°C
I, 105°C
Q, –40°C
Q, 25°C
Q, 85°C
Q, 105°C
NF
GAIN
LO FREQUENCY (MHz)
2200 2300 2400 2500 2600 2700 2800 2900
3000
–4
GAIN, NF (dB)
0
4
8
24
16
20
12
–2
2
6
22
14
18
10
5585 G72
I, 0dBm
I, 6dBm
I, 10dBm
Q, 0dBm
Q, 6dBm
Q, 10dBm
TC = 25°C
NF
GAIN
IP2I, IP2Q TRIM VOLTAGE (V)
0
DSB NOISE FIGURE (dB)
16
18
20
0.8
5585 G73
14
12
15
17
19
13
11
10 0.20.1 0.40.3 0.6 0.7 0.9
0.5
1.0
I, –20dBm
I, 0dBm Q, –20dBm
Q, 0dBm
TC = 25°C
fRF = 2501MHz
fLO = 2500MHz
fNOISE = 60MHz
EIP2 = 5V
RF INPUT POWER (dBm)
–20
DSB NOISE FIGURE (dB)
19
22
25
24
23
20
21
17
18
14
15
11
12
–5 5 10
5585 G74
16
13
10 –15 –10 0
PLO = 0dBm
PLO = 6dBm
PLO = 10dBm
TC = 25°C
fLO = 2500MHz
fRF = 2501MHz
fNOISE = 60MHz
DCOI, DCOQ (V)
0
–25
DC OFFSET (mV)
–20
–10
–5
0
25
30
35
40
10
0.2 0.4
5585 G75
–15
15
20
5
0.6 1.00.8
0.1 0.3 0.5 0.7 0.9
I, –40°C
I, 25°C
I, 85°C
I, 105°C
Q, –40°C
Q, 25°C
Q, 85°C
Q, 105°C
fLO = 2600MHz
LO FREQUENCY (MHz)
2200
–5
–3
1
3
5
9
2400 2600
–1
11
13
7
2800
TC = 25°C
I, 0dBm
I, 6dBm
I, 10dBm
Q, 0dBm
Q, 6dBm
Q, 10dBm
LO FREQUENCY (MHz)
2200
–80
LEAKAGE (dBm), –ISOLATION (dB)
–70
–60
–50
–10
–30
2300 2400 2700 2800 2900
–20
–40
–75
–65
–55
–15
–35
–25
–45
2500 2600
3000
5585 G77
L-R, –40°C
L-R, 25°C
L-R, 85°C
L-R, 105°C
R-L, –40°C
R-L, 25°C
R-L, 85°C
R-L, 105°C
LO FREQUENCY (MHz)
2200
IMAGE REJECTION (dB)
60
80
3000
5585 G78
40
20 2400 2600 2800
2300 2500 2700 2900
100
50
70
30
90
TC = –40°C
TC = 25°C
TC = 85°C
TC = 105°C
LTC5585
LTC5585
16
5585fb
For more information www.linear.com/LTC5585
PIN FUNCTIONS
IP2Q, IP2I (Pin 1, Pin 4): IIP2 Adjustment Analog Control
Voltage Input for Q and I Channel. A decoupling capacitor
is recommended on this pin. A low output resistance volt-
age source is recommended for driving these pins. These
pins should be left floating if unused.
DCOQ, DCOI (Pin 2, Pin 3): DC Offset Analog Control
Voltage Input for Q and I Channel. A decoupling capaci-
tor is recommended on this pin. A low output resistance
voltage source is recommended for driving these pins.
These pins should be left floating if unused.
RF (Pin 5): RF Input. External matching is used to obtain
good return loss across the RF input frequency range.
The RF pin is internally shorted to ground through internal
transformer windings. The RF pin should be DC-blocked
with a 1000pF coupling capacitor.
GND (Pins 6, 8, 13, 14, Exposed Pad Pin 25): Ground.
These pins must be soldered to the RF ground plane on
the circuit board. The backside exposed pad ground con-
nection should have a low inductance connection and
good thermal contact to the printed circuit board ground
plane using many through-hole vias. See Figures 2 and 3.
EN (Pin 7): Enable Pin. When the voltage on the EN pin
is a logic high, the chip is completely turned on; the chip
is completely turned off for a logic low. An internal 200k
pull-down resistor ensures the chip remains disabled if
there is no connection to the pin (open-circuit condition).
VBIAS (Pin 9): This pin can be pulled to ground through
a resistor to lower the current consumption of the chip.
See Applications Information.
VCC (Pin 10): Positive Supply Pin. This pin should be
bypassed with shunt 1000pF and 1µF capacitors.
EDC (Pin 11): DC Offset Adjustment Mode Enable Pin.
When the voltage on the EDC pin is a logic high, the DC
offset control circuitry is enabled. The circuitry is disabled
for a logic low. An internal 200k pull-down resistor ensures
the circuitry remains disabled if there is no connection to
the pin (open-circuit condition).
EIP2 (Pin 12): IP2 Offset Adjustment Mode Enable Pin.
When the voltage on the EIP2 pin is a logic high, the IP2
adjustment circuitry is enabled. The circuitry is disabled
for a logic low. An internal 200k pull-down resistor ensures
the circuitry remains disabled if there is no connection to
the pin (open-circuit condition).
LO+,LO (Pin 15, Pin 16): LO Inputs. External matching
is required to obtain good return loss across the LO input
frequency range. Can be driven single ended or differen-
tially with an external transformer. The LO pins should be
DC-blocked with a 1000pF coupling capacitor.
VCAP, CMQ, CMI (Pin 17, Pin 18, Pin 19): Common Mode
Bypass Capacitor Pins. It is recommended that CMI and
CMQ be connected to VCAP through 0.1µF capacitors.
Nothing else should be connected to VCAP since it is con-
nected to VCC inside the chip.
I+, I, Q+, Q (Pin 23, Pin 22, Pin 21, Pin 20): Differential
Baseband Output Pins for the I Channel and Q Channel.
The DC bias point is VCC – 1.5V for each pin. These pins
must have an external 100Ω or an inductor pull-up to VCC.
REF (Pin 24): Voltage Reference Input for Analog Control
Voltage Pins. A decoupling capacitor is recommended
on this pin. A low output resistance voltage source is
recommended for driving this pin. This pin should be left
floating if unused.
LTC5585 L7HEJWEGR 1 7
LTC5585
17
5585fb
For more information www.linear.com/LTC5585
BLOCK DIAGRAM
RF
GND
90°
BIAS
IP2 AND DC
OFFSET CAL
VCC VCAP CMI
I+
I
IP2 AND DC
OFFSET CAL
23
19
22
5
Q+
Q
CMQ
20
21
18
EDC
EIP2
REF
12
11
24
DCOI 3
IP2I 4
IP2Q 1
DCOQ 2
6
LO+
15
LO
16
EN
GND
7
GND GND
5585 BD
EXPOSED
PAD
VBIAS
9
258 13 14
10 17
LTC5585 f RF 18
LTC5585
18
5585fb
For more information www.linear.com/LTC5585
TEST CIRCUIT
FREQUENCY RANGE
RF MATCH LO MATCH
C17 L6 C19 C13 L5 C14
700MHz 2.7pF 1.0pF 12nH 5.6pF
1950MHz 1.2pF 5.1nH 5.1nH 1.0pF
2150MHz 1.5pF 4.7nH 0.5pF 5.1nH 0.7pF
2600MHz 0.5pF 2.7nH 1.2nH 1pF
REF DES VALUE SIZE VENDOR REF DES VALUE SIZE VENDOR
C10, C11, C31-C35 0.1μF 0402 Murata L5, L6 See Table 0402 Murata
C12, C15, C18, C36, C37 1000pF 0402 Murata R9, R11, R13, R14 100Ω 0402 Vishay
C13, C14, C17, C19 See Table 0402 Murata T1 4:1 0805 Anaren
BD0826J50200A00
C16, C21, C22, C29, C30 1μF 0402 Murata
Figure 1. Test Circuit Schematic
24 23 22 21 20 19
7
C35
8 9 10 11 12
6
5
4
3
2
1
13
25
14
15
16
17
18
C11
IP2Q
DCOQ
DCOI
IP2I
RF
GND
IP2Q
DCOQ
DCOI
IP2I
CMQ
VCAP
LO
LO+
GND
GND
GND
REF
I+
I
Q+
Q
CMI
EN
GND
VBIAS
VCC
EDC
EIP2
LTC5585IUF
C36
3T1
2
4
1
6
5
C12
C37
C10
C31
C21
R11 C22 C30
C13 C14
LO
EIP2
EDC
C16
5585 F01
VCC
4.75V TO 5.25V
C15
C19
L6
C17
C18
C34C33
C29
C32
RF
I+ OUT
I OUT
Q OUT
Q+ OUT
EN
REF
RF
GND
0.015"
0.015"
0.062"
NELCO N4000-13
DC
GND
L5
R13R9 R14
LTC5585 L7HDN§QB 1 9
LTC5585
19
5585fb
For more information www.linear.com/LTC5585
APPLICATIONS INFORMATION
TEST CIRCUIT
The LTC5585 is an IQ demodulator designed for high
dynamic range receiver applications. It consists of RF
transconductance amplifiers, I/Q mixers, quadrature LO
amplifiers, IIP2 and DC offset correction circuitry, and
bias circuitry.
Operation
As shown in the Block Diagram for the LTC5585, the RF
signal is applied to the inputs of the RF transconductor
V-to-I converters and is then demodulated into I/Q
baseband signals using quadrature LO signals which are
internally generated by a precision 90° phase shifter. The
demodulated I/Q signals are lowpass filtered on-chip with
a –3dB bandwidth of 530MHz. The differential outputs of
the I-channel and Q-channel are well matched in amplitude
and their phases are 90° apart.
Figure 2. Component Side of Evaluation Board Figure 3. Bottom Side of Evaluation Board
RF Input Port
Figure 4 shows the demodulator’s RF input which consists
of an integrated transformer and high linearity transcon-
ductance amplifiers (V-I converters). The primary side
of the transformer is connected to the RF input pin. The
secondary side of the transformer is connected to the
C19C17
RF
BIAS
L6
C18
1000pF
RF
INPUT
(MATCHED)
GND
5585 F04
LTC5585
Figure 4: Simplified Schematic of the RF Pin Interface
LTC5585 RETURN L055 (:18) L5=27me9= mama‘s: C‘7=‘5pEL6= CW=05pEL6= w; 5 um 4 7m 2 7m RETURN LOSS (HE) L7HDEQB
LTC5585
20
5585fb
For more information www.linear.com/LTC5585
APPLICATIONS INFORMATION
differential inputs of the transconductance amplifiers.
External DC voltage should not be applied to the RF input
pin. DC current flowing into the primary side of the trans-
former may cause damage to the integrated transformer.
A series DC blocking capacitor should be used to couple
the RF input pin to the RF signal source.
The RF input port can be externally matched over the
operating frequency range with simple L-C matching. An
input return loss better than 10dB can be obtained over a
bandwidth of better than 16% with this method. Figure5
shows the RF input return loss for various matching com-
ponent values. Table 1 shows the impedance and input
reflection coefficient for the RF input without using any
external matching components. The input transmission
line length is de-embedded from the measurement.
Larger bandwidths can be obtained by using multiple L-C
sections. For example Figure 6 shows a 2-section L-C
match having a bandwidth of about 38% where return
loss is >10dB. Figure 7 shows the RF input return loss
for the wide bandwidth match.
Broadband Performance
To get an idea of the broadband performance of the
LTC5585, a 6dB pad can be put on the RF and LO ports,
and the ports can be left unmatched. The measured RF
performance for this configuration is shown in Figures8,
9, 10 and 11 with the 6dB pad de-embedded. The RF
Figure 5. RF Input Return Loss
Figure 7. RF Input Return Loss for Wideband Match
Table 1. RF Input Impedance
FREQUENCY
(MHz) INPUT IMPEDANCE (Ω)
S11
MAG ANGLE (°)
400 6.98 + j25.09 0.800 125.98
600 10.43 + j39.74 0.775 101.55
800 16.76 + j56.73 0.751 80.01
1000 28.55 + j77.15 0.727 61.05
1200 51.47 + j101.03 0.706 44.29
1400 96.49 + j122.28 0.686 29.33
1600 171.91 + j112.37 0.667 15.81
1800 229.92 + j30.89 0.648 3.45
2000 202.21 – j58.84 0.630 –8.00
2200 145.32 – j91.23 0.612 –18.71
2400 104.82 – j91.69 0.594 –28.49
2600 78.33 – j83.38 0.575 –38.22
2800 61.86 – j73.64 0.557 –47.49
3000 51.27 – j64.65 0.538 –56.32
3200 43.83 – j56.56 0.519 –65.15
3400 38.86 – j49.72 0.500 –73.40
3600 35.17 – j43.6 0.481 –81.68
3800 32.46 – j38.21 0.463 –89.79
4000 30.48 – j33.41 0.444 –97.76
C19
0.5pF
C17
1.2pF
L6
8.2nH RF BIAS
C18
1000pF
RF INPUT
1500MHz TO
2200MHz
GND
5585 F06
LTC5585
L7
3.9nH
Figure 6. Wide Bandwidth RF Input Match
FREQUENCY (GHz)
0
–30
RETURN LOSS (dB)
–25
–15
–10
–5
5
0.5 2.5 3.5
5585 F05
–20
0
24.5 5
11.5 3 4
L6 = 2.7pF, C19 = 1pF
L6 = 1.2pF, C19 = 5.1nH
C17 = 1.5pF, L6 = 4.7nH, C19 = 0.5pF
C17 = 0.5pF, L6 = 2.7nH
TC = 25°C
FREQUENCY (GHz)
0
–20
RETURN LOSS (dB)
–15
–10
–5
0
0.5 1 1.5 2
5585 F07
2.5 3 3.5 4
TC = 25°C
L7 = 3.9nH, C17 = 1.2pF
L6 = 8.2nH, C19 = 0.5pF
LTC5585 "m was mam) GAIN NF ([18) ISD IIP2 (dam) IMAGE REJECTION (as) L7 HEW 2 1
LTC5585
21
5585fb
For more information www.linear.com/LTC5585
APPLICATIONS INFORMATION
tone spacing is 1MHz, and fLO is 10MHz lower than fRF.
The conversion gain is lower than under the impedance
matched condition, and correspondingly the P1dB, IIP3,
and NF are higher. As shown, the part can be used at
frequencies outside its specified operating range with
reduced conversion gain and higher NF.
LO Input Port
The demodulator’s LO input interface is shown in Fig-
ure12. The input consists of a high precision quadrature
phase shifter which generates 0° and 90° phase shifted
LO signals for the LO buffer amplifiers to drive the I/Q
mixers. DC blocking capacitors are required on the LO+
and LO inputs.
Figure 8. Broadband IIP3 and IP1dB
Figure 11. Broadband Image Rejection
Figure 9. Broadband IIP2
Figure 10. Broadband NF and Gain
The differential LO input impedance and S parameters with
the input transmission lines and balun de-embedded are
listed in Table 2.
Figure 13 shows LO input return loss using the ANAREN
BD0826J50200A00 4:1 balun with various matching
component values.
For optimum IIP2 and large-signal NF performance the LO
inputs should be driven differentially with a 4:1 balun such
as the ANAREN BD0826J50200A00 or BD2425J50200AHF.
As shown in Figure 14, the LO input can also be driven
single-ended from either the LO+ or LO input. The unused
port should be DC-blocked and terminated with a 50Ω load.
Figure 15 compares the uncalibrated IIP2 performance of
single ended versus differential LO drive.
LO FREQUENCY (MHz)
400
10
IIP3, P1dB (dBm)
14
22
26
30
50
38
1400 2400 2900 3400
5585 F08
18
42
46
34
900 1900 3900
I, –40°C
I, 25°C
I, 85°C
I, 105°C
Q, –40°C
Q, 25°C
Q, 85°C
Q, 105°C
IIP3
P1dB
LO FREQUENCY (MHz)
400
30
IIP2 (dBm)
40
60
70
80
130
100
1400 2400 2900 3400
5585 F09
50
110
120
90
900 1900 3900
I, –40°C
I, 25°C
I, 85°C
I, 105°C
Q, –40°C
Q, 25°C
Q, 85°C
Q, 105°C
LO FREQUENCY (MHz)
–4
GAIN, NF (dB)
0
–2
6
8
10
12
14
20
18
16
30
24
1400 2400 2900 3400
5585 F10
2
4
26
28
22
900 1900 3900
I, –40°C
I, 25°C
I, 85°C
I, 105°C
Q, –40°C
Q, 25°C
Q, 85°C
Q, 105°C
NF
GAIN
LO FREQUENCY (MHz)
500
IMAGE REJECTION (dB)
60
80
4000
5585 F11
40
20 1500 2500 3500
1000 2000 3000
100
50
70
30
90
TC = –40°C
TC = 25°C
TC = 85°C
TC = 105°C
LTC5585 _ _| as $9 21351 22
LTC5585
22
5585fb
For more information www.linear.com/LTC5585
APPLICATIONS INFORMATION
Figure 12. Simplified Schematic of LO Input Interface with External Matching Components
TO IDENTICAL
Q-CHANNEL
PHASE SHIFTER
LTC5585
V
CC
LO+
C37
1000pF
LO
INPUT
(MATCHED)
C13
C36
1000pF
ANAREN
BD0826J50200A00
LO
GND
5585 F12
C14
L5
Table 2. LO Input Impedance (Differential)
FREQUENCY
(MHz) INPUT IMPEDANCE (Ω)
S11
MAG ANGLE (°)
400 118.18 – j120.02 0.668 –24.89
600 94.18 – j99.93 0.623 –31.42
800 78.00 – j85.06 0.583 –38.17
1000 67.21 – j73.16 0.544 –44.79
1200 59.71 – j63.49 0.507 –51.25
1400 54.22 – j55.46 0.471 –57.63
1600 50.06 – j48.59 0.437 –64.02
1800 46.80 – j42.69 0.405 –70.49
2000 44.10 – j37.42 0.374 –77.28
2200 41.86 – j32.61 0.345 –84.47
2400 39.98 – j28.16 0.317 –92.21
2600 38.39 – j23.98 0.291 –100.65
2800 37.05 – j20.01 0.267 –109.95
3000 35.92 – j16.21 0.246 –120.29
3200 34.99 – j12.53 0.228 –131.76
3400 34.22 – j8.95 0.214 –144.37
3600 33.61 – j5.45 0.206 –157.88
3800 33.15 – j2.0 0.204 –171.85
4000 32.82 + j1.4 0.208 174.35
Figure 13. LO Input Return Loss
FREQUENCY (GHz)
0
–30
RETURN LOSS (dB)
–25
–15
–10
–5
5
0.5 2.5 3.5
5585 F13
–20
0
24.5 5
11.5 3 4
L5 = 12nH, C14 = 5.6pF
C13 = 5.1nH, L5 = 1.0pF
L5 = 5.1nH, C14 = 0.7pF
L5 = 1.2nH, C14 = 1pF
LTC5585 mu IIP2 (dEm) _ S‘NGLEVENDED LO‘ \ SIDE \FFERENT‘AL LD. \ smE \NGLEVENDED LO‘ 0 $qu \FFERENT‘AL LD. 0 $qu ,1 2 RPULLU 50 P HRLDAD(SE) L7 LJUW 23
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APPLICATIONS INFORMATION
I-Channel and Q-Channel Outputs
The phase relationship between the I-channel output
signal and the Q-channel output signal is fixed. When the
LO input frequency is higher (or lower) than the RF input
frequency, the Q-channel outputs (Q+, Q) lag (or lead)
the I-channel outputs (I+, I) by 90°.
Each of the I-channel and Q-channel outputs is internally
connected to VCC through a 100Ω resistor. In order to
maintain an output DC bias voltage of VCC – 1.5V, ex-
ternal 100Ω pull-up resistors or equivalent 15mA DC
current sources are required. Each single-ended output
has an impedance of 100Ω in parallel with a 6pF internal
capacitor. With an external 100Ω pull-up resistor this
forms a lowpass filter with a –3dB corner frequency at
530MHz. The outputs can be DC coupled or AC coupled
to external loads. The voltage conversion gain is reduced
by the external load by:
20Log
10
1
2
+50
RPULL-UP ||RLOAD(SE)
dB
when the output port is terminated by RLOAD(SE). For in-
stance, the gain is reduced by 6dB when each output pin is
connected to a 50Ω load (or 100Ω differentially). The output
should be taken differentially (or by using differential-to-
single-ended conversion) for best RF performance, includ-
ing NF and IIP2. When no external filtering or matching
components are used, the output response is determined
by the loading capacitance and the total resistance loading
the outputs. The –3dB corner frequency, fC, is given by
the following equation:
fC = [2π(RLOAD(SE)||100Ω||RPULL-UP) (6pF)]–1
Figure 16 shows the actual measured output response
with various load resistances.
Figure 17 shows a simplified model of the I, Q outputs
with a 100Ω differential load and 100Ω pull-ups. The –1dB
bandwidth in this configuration is about 520MHz, or about
twice the –1dB bandwidth with no load.
TO IDENTICAL
Q-CHANNEL
PHASE SHIFTER
LTC5585
V
CC
LO+
C37
1000pF
50Ω
L5
LO
INPUT
(MATCHED)
C13
C36
1000pF
LO
GND
5585 F14
C14
Figure 14. Recommended Single-Ended LO Input Configuration
Figure 15. Broadband IIP2 with Differential
and Single-Ended LO Drive
LO FREQUENCY (MHz)
400
30
IIP2 (dBm)
40
60
70
80
100
1400 2400 2900 3400
5585 F15
50
90
900 1900 3900
SINGLE-ENDED LO, I SIDE
DIFFERENTIAL LO, I SIDE
SINGLE-ENDED LO, Q SIDE
DIFFERENTIAL LO, Q SIDE
TC = 25°C
LTC5585 CONVERSION GAIN (nay 3} LS] $3 $5»; TH ””E j .||.| I|-| ; LW
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Figure 16. Conversion Gain Baseband Output Response with
RLOAD(DIFF) = 100Ω, 200Ω, 400Ω and 1k and RPULL-UP = 100Ω
APPLICATIONS INFORMATION
Figure 18 shows a simplified model of the I, Q outputs
with a L-C matching network for bandwidth extension.
Capacitor CS serves to filter common mode LO switching
noise immediately at the demodulator outputs. Capacitor
CC in combination with inductor LS is used to peak the
output response to give greater bandwidth of 650MHz. In
this case, capacitor CC was chosen as a common mode
capacitor instead of a differential mode capacitor to increase
rejection of common mode LO switching noise.
When AC output coupling is used, the resulting highpass
filter’s –3dB roll-off frequency, fC, is defined by the R-C
constant of the external AC coupling capacitance, CAC, and
the differential load resistance, RLOAD(DIFF):
fC = [2π • RLOAD(DIFF) • CAC]–1
Figure 17. Simplified Model of the Baseband Output
Figure 18. Simplified Model of the Baseband Output Showing Bandwidth Extension with External L, C Matching
100Ω
LTC5585
100Ω6pF 6pF
0.2pF
I+
I
0.2pF
5585 F17
R
LOAD(DIFF)
100Ω
–1dB BW = 520MHz
1.5nH
VCC
V
CC
GND
1k
AC CURRENT
SOURCE
1.5nH
30mA30mA
RPULL-UP
100Ω
RPULL-UP
100Ω
PACKAGE
PARASITICS
100Ω
LTC5585
100Ω6pF 6pF
0.2pF
I+
I
0.2pF CS
2pF
CS
2pF CC
4pF
CC
4pF
LS
10nH
LS
10nH
5585 F18
R
LOAD(DIFF)
100Ω
LOWPASS
–1dB BW = 650MHz
1.5nF
VCC
V
CC
GND
1k
AC CURRENT
SOURCE
1.5nF
30mA DC30mA DC
RPULL-UP
100Ω
RPULL-UP
100Ω
PACKAGE
PARASITICS
BASEBAND FREQUENCY (GHz)
0
–10
CONVERSION GAIN (dB)
–8
–9
–7
–5
–4
–3
0
1
3
2
4
5
0.2 0.4
5585 G16
–6
–1
–2
0.6 1.00.8
0.1 0.3 0.5 0.7 0.9
TC = 25°C
RLOAD(DIFF) = 100Ω, BW = 850MHz
RLOAD(DIFF) = 200Ω, BW = 630MHz
RLOAD(DIFF) = 400Ω, BW = 530MHz
RLOAD(DIFF) = 1k, BW = 460MHz
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APPLICATIONS INFORMATION
Care should be taken when the demodulator’s outputs
are DC coupled to the external load to make sure that the
I/Q mixers are biased properly. If the current drain from
the outputs exceeds about 6mA, there can be significant
degradation of the linearity performance. Keeping the com-
mon mode output voltage of the demodulator above 3.15V,
with a 5V supply, will ensure optimum performance. Each
output can sink no more than 30mA when the outputs are
connected to an external load with a DC voltage higher
than VCC – 1.5V.
In order to achieve the best IIP2 performance, it is im-
portant to minimize high frequency coupling among the
baseband outputs, RF port, and LO port. Although it may
increase layout complexity, routing the baseband output
traces on the backside of the PCB can improve uncalibrated
IIP2 performance. Figure 19 shows the alternate layout
having the baseband outputs on the backside of the PCB.
Analog Control Voltage Pins
Figure 20 shows the equivalent circuit for the DCOI, DCOQ,
IP2I, and IP2Q pins. Internal temperature compensated
62.5μA current sources keep these pins biased at a nominal
500mV through 8k resistors. A low impedance voltage
source with a source resistance of less than 200Ω is
recommended to drive these pins.
Figure 19. Alternate Layout of PCB with
Baseband Outputs on the Backside
Figure 20. Simplified Schematic of the Interface for the
DCOI, DCOQ, IP2I and IP2Q Pins
Figure 21. Simplified Schematic of the REF Pin Interface
GND
5585 F20
V
CC
8k
DCOI, DCOQ,
IP2I, IP2Q
62.5µA
LTC5585
GND
5585 F21
V
CC
2k
REF
250µA
LTC5585
As shown in Figure 21, the REF pin is similar to the DCOI
pin, but the bias current source is 250µA, and the inter-
nal resistance is 2k. If this pin is left disconnected, it will
self-bias to 500mV. A low impedance voltage source with
a source resistance of less than 200Ω is recommended
to drive this pin. The control voltage range of the DCOI,
DCOQ, IP2I and IP2Q pins is set by the REF pin. This range
is equal to 0V to twice the voltage on the REF pin, whether
internally or externally applied.
It is recommended to decouple any AC noise present on
the signal lines that connect to the analog control-voltage
inputs. A shunt capacitor to ground placed close to these
pins can provide adequate filtering. For instance, a value
of 1000pF on the DCOI, DCOQ, IP2I and IP2Q pins will
provide a corner frequency of around 6 to 7MHz. A similar
corner frequency can be obtained on the REF pin with a
value of 3900pF. Using larger capacitance values such as
0.1µF is recommended on these pins unless a faster control
LTC5585 RESPONSE (d2) “m 88% | [—4 $39 393
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APPLICATIONS INFORMATION
response is needed. Figure 22 shows the input response
–3dB bandwidth for the pins versus shunt capacitance
when driven from a 50Ω source.
Figure 22. Input Response Bandwidth for the
DCOI, DCOQ, IP2I and IP2Q Pins
SAMPLE AND
HOLD
DC
AVERAGING
LOWPASS
FILTER
DSP
DAC
ADC
DCOI
fLO = 1950MHz
5585 F23
LNA
BPF
LTC5585
1-D
MINIMIZATION
ALGORITHM
Figure 23. Block Diagram of a Receiver with a DSP Feedback Loop for DC Offset Adjustment
FREQUENCY (MHz)
0
RESPONSE (dB)
–4
–2
0
16
5585 F22
–6
–8
–5
–3
–1
–7
–9
–10 42 86 12 14 18
10 20
DCOI, DCOQ; C = 470pF
DCOI, DCOQ; C = 1000pF
IP2I, IP2Q; C = 1000pF
TC = 25°C
DC Offset Adjustment Circuitry
Any sources of LO leakage to the RF input of a direct
conversion receiver will contribute to the DC offsets of
its baseband outputs. The LTC5585 features DC offset
adjustment circuitry to reduce such effects. When the
EDC pin is a logic high the circuitry is enabled and the
resulting DC offset adjustment range is typically ±20mV.
In a typical direct conversion receiver application, DC
offset calibration will be done periodically at a time when
no receive data is present and when the receiver DC levels
have sufficiently settled.
DC Offset Adjustment Example
Figure 23 shows a typical direct conversion receive path
having a DSP feedback path for DC offset adjustment.
Any sources of LO leakage to the RF input of the LTC5585
demodulator will contribute to the DC offset of the receiver.
This includes both static and dynamic DC offsets. If the
coupling is static in nature due to fixed board-level leakage
paths, the resulting DC offset does not typically need to
be adjusted at a high repetition rate. Dynamic DC offsets
due to transmitter transient leakage or antenna reflection
can be much harder to correct for and will require a faster
update rate from the DSP.
LO leakage into the RF port of the demodulator causes a
DC offset at the baseband outputs which is then multiplied
by the gain in the baseband path. The usable ADC voltage
window will be reduced by the amplified DC offset, result-
ing in lower dynamic range. Using DSP, this DC offset
value can be averaged and sampled at a given update
rate and then a 1D minimization algorithm can be applied
before a new DCOI or DCOQ control signal is generated to
minimize the offset. The 1-D minimization algorithm can
be implemented in many ways such as golden-section
search, backtracking, or Newton’s method.
IM2 Adjustment Circuitry
The LTC5585 also contains circuitry for the independent
adjustment of IM2 levels on the I and Q channels. When
the EIP2 pin is a logic high, this circuitry is enabled and
the IP2I and IP2Q analog control voltage inputs are able
LTC5585 m (dam) 8 H] a ,2, v P I A m a < e="" e="" _=""> g \ / I S \ / L7HEJWEGR 27
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APPLICATIONS INFORMATION
to adjust the IM2 level. The IM2 level can be effectively
minimized over a large range of the baseband bandwidth.
The circuitry has an effective baseband frequency upper
limit of about 200MHz. Any IM2 component that falls in this
frequency range can be minimized. Beyond this frequency,
the gain of the IM2 correction amplifier falls off appreciably
and the circuit no longer improves IP2 performance. The
lower baseband frequency limit of the IM2 adjustment
circuitry is set by the common mode reference decoupling
capacitor at the CMI and CMQ pins. Below this frequency
the circuit can not minimize the IM2 component.
Figure 24 shows the CMI (and identical CMQ) pin interface.
These pins have an internal 40pF decoupling capacitance
to VCC, to provide a reference for the IP2 adjustment cir-
cuitry. The lower 3dB frequency limit, fC, of the circuitry
is set by the following equation:
fC = [2π • 500(40pF + CCM(EXT))]–1
Without any external capacitor on the CMI or CMQ pin the
lower limit is 8MHz. By adding a 0.1μF capacitor, CCM(EXT),
between the CMI and CMQ pins to VCAP, the lower –3dB
frequency corner can be reduced to 3kHz. Figure 25 shows
IIP2 as a function of RF frequency spacing versus common
mode decoupling capacitance values of 0.1µF and 1500pF.
There is effectively no limit on the size of this capacitor,
other than the impact it has on enable time for the IM2
circuitry to be operational. When the chip is disabled, there
is no current in the I or Q mixers, so the common mode
output voltage will be equal to VCC (if no DC common mode
current is being drawn by external baseband circuitry such
as a baseband amplifier). When the chip is enabled, the
off-chip common mode decoupling capacitor must charge
up through a 500Ω resistor. The time constant for this
is essentially 500Ω times the common mode decoupling
capacitance value. For example, with a 0.01µF capacitor
this wait time is approximately 30μs. Figure 26 shows
the pulsed enable response of the common-mode output
voltage with 0.01µF on the CMI and CMQ pins.
Figure 24. Equivalent Circuit of the CMI and CMQ Pin Interfaces Figure 26. Common Mode Output Voltage with a Pulsed Enable
Figure 25. IIP2 vs Common Mode Decoupling Capacitance
GND
5585 F24
V
CC
VCAP
CMI OR CMQ
40pF
LTC5585
RF FREQUENCY SPACING (MHz)
0.01
30
IIP2 (dBm)
50
60
70
80
90
100
0.1 1
5585 F25
110
120
130
TC = 25°C
fRF1 = 2150MHz
fLO = 2100MHz
40
10
0.1µF (UNCALIBRATED)
0.1µF (NULLED IP2I = 0.1V)
1500pF (UNCALIBRATED)
1500pF (NULLED IP2I = 0.15V)
TIME (µs)
0
V
CM
(V)
ENABLE VOLTAGE (V)
6
7
8
80
5585 F26
5
4
3
0
5
10
–5
–10
–15
10 20 30 40 50 60 70 90 100
TC = 25°C
CCMI,Q = 0.01µF
EN
PULSE
OFF
EN PULSE ON
CMI, CMQ
BASEBAND OUTPUTS
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IM2 Suppression Example
IM2 adjustment circuitry can be used in a typical trans-
ceiver loop-back application as shown in Figure 27. In
this example a 2-tone SSB training source of f1 = 20MHz
and f2 = 21MHz is generated in DSP and upconverted
by the LTC5588-1 quadrature modulator to RF tones at
1970MHz and 1971MHz using an LO source at 1950MHz.
A narrowband RF filter is required to remove the IM2
component generated by the LTC5588-1. During the
loopback test these RF tones are routed through high
isolation switches and an attenuation pad to the LTC5585
demodulator input. The tones are then downconverted by
the same LO source at 1950MHz to produce two tones
at the baseband outputs of 20MHz and 21MHz plus an
IM2 impairment signal at 1MHz. After baseband chan-
nel filtering and amplification the output of the ADC is
filtered by a 1MHz bandpass filter in DSP to isolate the
IM2 tone. The power in this tone is calculated in DSP and
then a 1-D minimization algorithm is applied to calculate
the correction signal for the IP2I control voltage pin. The
1-D minimization algorithm can be implemented in many
ways such as golden-section search, backtracking or
Newton’s method.
Enable Interface
A simplified schematic of the EN pin is shown in Figure28.
The enable voltage necessary to turn on the LTC5585 is 2V.
To disable or turn off the chip, this voltage should be below
0.3V. If the EN pin is not connected, the chip is disabled.
APPLICATIONS INFORMATION
Figure 27. Block Diagram for a Direct Conversion Transceiver with IM2 Adjustment. Only the I-Channel Is Shown
Figure 28. Simplified Schematic of the EN Pin Interface
Figure 29. Simplified Schematic of the EDC Pin Interface
RMS
DETECTION
1MHz BPF
DSP
DAC
ADC
IP2I
fLO = 1950MHz
f1 = 20MHz
f2 = 21MHz
5585 F27
LNA
LTC5585
LOOPBACK
LTC5588-1
1-D
MINIMIZATION
ALGORITHM
DAC
PA
+
100k
EN
LTC5585
GND
5585 F28
V
CC
100k
EN
100k
100k
EDC
LTC5585
5585 F29
V
CC
GND
Figures 29 and 30 show the simplified schematics for the
EDC and EIP2 pins
LTC5585 st ma mam) L7HEJWEGR 29
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APPLICATIONS INFORMATION
It is important that the voltage applied to the EN, EDC and
EIP2 pins should never exceed VCC by more than 0.3V.
Otherwise, the supply current may be sourced through the
upper ESD protection diode connected at the pin. Under
no circumstances should voltage be applied to the enable
pins before the supply voltage is applied to the VCC pin. If
this occurs, damage to the IC may result.
Reducing Power Consumption
Figure 31 shows the simplified schematic of the VBIAS
interface. The VBIAS pin can be used to lower the mixer
core bias current and total power consumption for the
chip. For example, adding 294Ω from the VBIAS pin to
GND will lower the DC current to 150mA, at the expense
of reduced IIP3 performance. Figure 32 shows IIP3 and
P1dB performance versus DC current and resistor value.
An optional capacitor, COPT in Figure 31, has minimal ef-
fect on improving PSRR and IIP2.
1950MHz Receiver Application
Figure 33 shows a typical receiver application consisting of
the chain of LNA, demodulator, lowpass filter, ADC driver,
and ADC. Total DC power consumption is about 2.1W.
Full-scale power at the RF input is -6dBm. The Chebychev
lowpass filter with unequal terminations is designed us-
ing the method shown in the appendix. Filter component
values are then adjusted for the best overall response
Figure 32. IIP3 and P1dB vs DC Current
and VBIAS Resistor Value
EN
V
CC
GND
5585 F31
100Ω
VBIAS
COPT
OPTIONAL R
TO REDUCE
CURRENT
LTC5585
Figure 31. Simplified Schematic of the VBIAS Pin Interface
100k
EIP2
LTC5585
GND
5585 F30
V
CC
100k
10k
Figure 30. Simplified Schematic of the EIP2 Pin Interface
LO FREQUENCY (MHz)
1500
5
IIP3, P1dB (dBm)
15
20
25
50
35
1700 1900 2000 2100
5585 G21
10
40
45
30
1600 1800
2200
I, 190mA
I, 170mA, 487Ω
I, 150mA, 294Ω
Q, 190mA
Q, 170mA, 487Ω
Q, 150mA, 294Ω
TC = 25°C
fRF = 1950MHz
IIP3
P1dB
and available component values. A positive voltage gain
slope with frequency is necessary to compensate for the
roll-off contributed by the ADC Driver and Anti-Alias Filter.
From the chain analysis shown in Figure 34, the IIP3-NF
dynamic range figure of merit (FOM) is 4.3dB at the LNA
input, 7.5dB at the demodulator input, and 14.85dB at the
ADC driver amp input.
The measured 6th order lowpass baseband response is
shown in Figure 35.
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APPLICATIONS INFORMATION
D15
D0
CONTROL
VCM
VDD
LTC2185
ADC
1.8V
206mA
5V
200mA
5V
48mA
AIN+
AIN
R20
105Ω
C22
62pF
C21
62pF
R19
105Ω
R16
35Ω
R15
35Ω
R5
110Ω
R4
110Ω
C23
1µF
5585 F33
R18
83Ω
R17
83Ω
R10
100Ω
R12
10Ω
R8
440Ω
R9
440Ω
R7
30Ω
R2
5.6k
R6
30Ω
R11
10Ω
R13
138Ω
R14
138Ω
5V
52mA
C19
0.4pF
C20
0.4pF
C18
0.1µF
L12 180nH
L11 180nH
L8 180nH
L7 180nH
40MHz LOWPASS FILTER 40MHz ANTI-ALIAS FILTER
L6 470nH
L3 4.7nH
AVAGO
MGA-634P8 L2
8.2nH
L4 4.7nH T1
ANAREN BD2425J50200AHF
L5 470nH
L10 180nH
L9 180nH
C15
150pF
C16
150pF
C17
1µF
R3
R1
49.9Ω
+
+
VOCN LTC6409
C13
150pF
C14
150pF
C12
47pF
C10
100pF
C11
100pF
LO INPUT
1950MHz
6dBm
C9
47pF
L2
8.2nH
C7
0.5pF
C2
100pF
C1
100pF
RF INPUT
1910MHz
TO
1990MHz
C4
100pF
C5
100pF
C3
4.7µF
C6
4.7µF
C8
0.5pF
I+
VCC
I
RF
LO
LO+
LTC5585
LNA
BIAS
Figure 33. Simplified Schematic of 1950MHz Receiver, (Only I-Channel Is Shown)
LTC5585 1950MH1 Receiver Chain Analysis Ll L®L 88% 88% L7 LJUW 3 1
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APPLICATIONS INFORMATION
Figure 34. 1950MHz Receiver Chain Analysis
LTC2185
5585 F34
40MHz AAFLTC6409
G = 0dB
NF = 23.1dB
IP3 = 47.5dBm
G = –1.2dB
NF = 1.2dB
G = 0dB
NF = 23.1dB
IIP3 = 47.5dBm
FOM = 24.4dB
G = –1.2dB
NF = 24.3dB
IIP3 = 48.7dBm
FOM = 24.4dB
40MHz LPF
1950MHz Receiver Chain Analysis
LTC5585
G = –0.3dB
NF = 0.3dB
G = –6.3dB
NF = 13dB
IIP3 = 27dBm
G = 21.5dB
NF = 10.85dB
IIP3 = 25.7dBm
FOM = 14.85dB
G = 15.2dB
NF = 18.3dB
IIP3 = 25.8dBm
FOM = 7.5dB
G = 21.8dB
NF = 10.55dB
IIP3 = 25.4dBm
FOM = 14.85dB
G = 23dB
NF = 10dB
OIP3 = 50dBm
MGA-634P8
G = 32.6dB
NF = 3.7dB
IIP3 = 8dBm
FOM = 4.3dB
G = 17.4dB
NF = 0.44dB
OIP3 = 36dBm
The receiver spurious free dynamic range (SFDR) in terms
of FOM can be calculated using the following equations:
FOM = IIP3 – NF
SFDR = 2/3(FOM – P0)
P0 = –174dBm + 10Log10(BW|Hz)
where P0 is the input noise power and –174dBm is the
input thermal noise power in a 1Hz bandwidth. A measured
2-tone output spectrum at 1910MHz is shown in Figure36.
IIP3 is calculated from the 2-tone IM3 levels:
IIP3 = (–7.067 – (–76.63))/2 – 13
IIP3 = 21.78dBm
Figure 35. Baseband Gain Response without LNA
For this example, receiver noise floor is approximated
by a measurement at 845MHz, where adequate filtering
for RF and LO signals was possible. Using the test data
from Figure 37, the receiver noise figure for the I-channel
(Ch1) is calculated using the –6dBm input power, 1875Hz
bin width, 40MHz bandwidth, and –116.3dBFS measured
in-band noise floor:
SNRIN = PIN – P0
SNRIN = – 6 – (–174 + 76) = 92dB
SNROUT = –10 Log10(BinW/BW) – Floor
SNROUT = –43.3 + 116.3 = 73dB
NF = SNRIN – SNROUT
NF = 92 – 73 = 19dB
Finally, an approximate receiver spurious free dynamic
range can be calculated using the measured data at
845MHz and 1910MHz:
SFDR = 2(IIP3 – NF – P0)/3
SFDR = 2(21.78 – 19 – (–174 + 76))/3
SFDR = 67.2dB (I-channel)
Measured IIP3 is 2.3dB higher for the Q-channel, so the
resulting SFDR is:
SFDR = 68.7dB (Q-channel)
FREQUENCY (MHz)
0
80
GAIN (dB)
70
50
–40
–30
20
–10
40 80 100
5585 F35
60
0
10
–20
20 60 120 140 160
TC = 25°C
LTC5585 pun-”FAmm xx): YM u-a :rz Var: :1: a flaunts ms ‘xmmu. .mm A.” 1‘ 1mm mauau§ um mm H... w. mm L7LJ£1N§Q§ 32 L7 LJUW
LTC5585
32
5585fb
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APPLICATIONS INFORMATION
Figure 36. fRF = 1909MHz and 1910MHz 2-Tone Receiver Test, fLO = 1930MHz.
Ch.1 Is the I-Channel and Ch.2 Is the Q-Channel. Tested without LNA
2 «u Wu mow. 354mm m 314w: g vnbavmx 1mm om vmm n m “M w w Hunk 4 Mambc “L‘flL‘k‘” 1': m 91»: 33
LTC5585
33
5585fb
For more information www.linear.com/LTC5585
APPLICATIONS INFORMATION
Figure 37. fRF = 845MHz Receiver Noise Floor Test, fLO = 846MHz.
Ch.1 Is the I-Channel and Ch.2 Is the Q-Channel. Tested without LNA
LTC5585 J> \ LRIN 21: 0% 86.19pF 43093;; L2 2,4,...,n
LTC5585
34
5585fb
For more information www.linear.com/LTC5585
APPENDIX
Chebychev Filter Synthesis with Unequal
Terminations
To synthesize Chebychev filters with unequal terminations,
two equally terminated filters are synthesized at the two
different impedance levels and the resulting networks are
joined using the Impedance Bisection Theorem[1]. This
method only works with symmetrical odd-order filters. The
general lowpass prototype element values are generated
by the method shown [2]:
β =In coth
L
Ar
|
dB
17.37
γ = sinh β
2n
ak=sinπ2k1
( )
2n ,k=1,2,...,n
b
k= γ2+sin2πk
n
,k=1,2,...,n
where LAr|dB is the passband ripple in dB, and n is the
filter order.
The prototype element values will be:
g
1=
2a
1
γ
g
k=4akak1
b
k1
g
k1
,k=1,2,...,n
g
n+1=1 for n odd
g
n+1=coth2β
4
for n eve
n
Assuming the first element is a capacitor, we can scale
the filter capacitor prototype values up to our desired
cutoff frequency fC:
C
k=
g
k
2
π
f
CRIN
,k=1,3,...,
n
The filter inductor values can be scaled with:
LK=
g
k
R
IN
2
π
f
C
,k=2,4,...,
n
where RIN is the input impedance and the terminating
impedance ROUT is equal to RIN for the n odd case but is
scaled by the gn+1 prototype value for the n even case.
The Impedance Bisection Theorem can be applied to sym-
metrical networks by dividing the element values along
the networks’ plane of symmetry, and then adding the
two networks together. The filter response is preserved.
For example, if LAr|dB = 0.2dB, fC = 40MHz, RIN = 100Ω,
ROUT = 20Ω and n = 5, the prototype element values and
resulting scaled filter values are listed:
Filter 1: RIN = ROUT = 100Ω
g1 = 1.339 C1 = 53.3pF
g2 = 1.337 L1 = 531.98nH
g3 = 2.166 C2 = 86.19pF
g4 = 1.337 L2 = 531.98nH
g5 = 1.339 C3 = 53.3pF
Filter 2: RIN = ROUT = 20Ω
g1 = 1.339 C1 = 266.48pF
g2 = 1.337 L1 = 106.4nH
g3 = 2.166 C2 = 430.93pF
g4 = 1.337 L2 = 106.4nH
g5 = 1.339 C3 = 266.48pF
The Impedance Bisection Theorem can be applied at the
plane of symmetry about C2 such that a new value of C2
can be computed with half the values of the two filters.
C2
86.19pF
2
+
430.93pF
2
=258.56pF
The final unequally-terminated filter design values are
shown in Figure 38.
Figure 38. Final Design Schematic
+
R
IN
100Ω
L1
531.98nH
C1
53.3pF
C2
258.56pF
L2
106.4nH
C3
266.48pF
ROUT
20Ω
5585 F38
[1] A.C. Bartlett, “An Extension of a Property of Artificial Lines,” Phil. Mag., vol.4, p.902,
November 1927.
[2] G. Matthaei, L. Young, and E.M.T. Jones, Microwave Filters, Impedance-Matching Networks,
and Coupling Structures, p.99, 1964.
LTC5585 :3’ NH—- N‘ N‘H | 388 388 IMAGE REJECTION may run—- N‘H N \dfiiredlz lOIog _ 2 Ilmagfl ‘1 AERR ZAERR C05(¢ERR) I ‘ 1+ AERRZ ’ ZAERR COS(¢ERR) I lOIog L7 LJUW 35
LTC5585
35
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APPENDIX
Image Rejection Calculation
Image rejection can be calculated from the measured gain
and phase error responses of the demodulator. Consider
the signal diagram of Figure 39:
We combine I(t) + Q–90(t) and choose terms containing
ωBB as the desired signal:
desired=
1
2
sin ωBBt
( )
+
A
ERR
2
sin ωBBtφERR
( )
Similarly, we choose terms containing ωIM as the image
signal:
image=
1
2
sin ωIMt
( )
A
ERR
2
sin ωIMt+φERR
( )
The image rejection ratio (IRR) can then be written as:
IRR|
dB =10log|desired|
2
|image|
2
Written in terms of AERR and φERR as:
IRR|
dB =10log
|1+A
ERR
2+2A
ERR
cos φ
ERR
( )
|
|1
+
AERR
2
2AERR cos
φ
ERR
( )
|
Figure 40 shows image rejection as a function of amplitude
and phase errors for a demodulator.
AERR
LOI(t)
LOQ(t)
RF(t)
I(t)
Q(t)
5585 F39
Figure 39. Signal Diagram for a Demodulator
where:
RF(t) = sin(ωLO + ωBB)t + sin(ωLO – ωIM)t
LOI(t) = cos(ωLOt + φERR)
LOQ(t) = sin(ωLOt)
ωLO + ωBB is the desired sideband frequency and
ωLO – ωIM is the image frequency. The total phase error
of the I and Q channels is lumped into the I-channel LO
source as φERR. The total gain error is represented by
AERR, and is lumped into a gain multiplier in the I-channel.
After lowpass filtering the I and Q signals can be written as:
I(t)=
A
ERR
2sin ωBBtφERR
( )
– sin ωIMt+φERR
( )
Q(t)=1
2
cos ωBBt
( )
+cos ωIMt
( )
Shifting the Q channel by –90° can be accomplished by
replacing sine with cosine such that the shifted Q-channel
signal is:
Q90(t) =
1
2
sin ωBBt
( )
+sin ωIMt
( )
Figure 40. Image Rejection as a Function of Gain and Phase Errors
PHASE ERROR (DEG)
10
IMAGE REJECTION (dB)
30
50
70
20
40
60
2 4 6 8
5585 F40
1010 3 5 7 9
AERR = 0dB
AERR = 0.05dB
AERR = 0.1dB
AERR = 0.2dB
AERR = 0.3dB
AERR = 0.5dB
AERR = 1dB
LTC5585 L7LJCUEN2 36
LTC5585
36
5585fb
For more information www.linear.com/LTC5585
PACKAGE DESCRIPTION
Please refer to http://www.linear.com/designtools/packaging/ for the most recent package drawings.
UF Package
24-Lead Plastic QFN (4mm × 4mm)
(Reference LTC DWG # 05-08-1697 Rev B)
4.00 ±0.10
(4 SIDES)
NOTE:
1. DRAWING PROPOSED TO BE MADE A JEDEC PACKAGE OUTLINE MO-220 VARIATION (WGGD-X)—TO BE APPROVED
2. DRAWING NOT TO SCALE
3. ALL DIMENSIONS ARE IN MILLIMETERS
4. DIMENSIONS OF EXPOSED PAD ON BOTTOM OF PACKAGE DO NOT INCLUDE
MOLD FLASH. MOLD FLASH, IF PRESENT, SHALL NOT EXCEED 0.15mm ON ANY SIDE, IF PRESENT
5. EXPOSED PAD SHALL BE SOLDER PLATED
6. SHADED AREA IS ONLY A REFERENCE FOR PIN 1 LOCATION
ON THE TOP AND BOTTOM OF PACKAGE
PIN 1
TOP MARK
(NOTE 6)
0.40 ±0.10
2423
1
2
BOTTOM VIEW—EXPOSED PAD
2.45 ±0.10
(4-SIDES)
0.75 ±0.05 R = 0.115
TYP
0.25 ±0.05
0.50 BSC
0.200 REF
0.00 – 0.05
(UF24) QFN 0105 REV B
RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS
0.70 ±0.05
0.25 ±0.05
0.50 BSC
2.45 ±0.05
(4 SIDES)
3.10 ±0.05
4.50 ±0.05
PACKAGE OUTLINE
PIN 1 NOTCH
R = 0.20 TYP OR
0.35 ×
45° CHAMFER
UF Package
24-Lead Plastic QFN (4mm × 4mm)
(Reference LTC DWG # 05-08-1697 Rev B)
LTC5585 L7Hߤ0g 37
LTC5585
37
5585fb
For more information www.linear.com/LTC5585
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa-
tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.
REVISION HISTORY
REV DATE DESCRIPTION PAGE NUMBER
A 8/12 Changes to 1950MHz L6, C19 and L5 Matching Component Values
Correction to Plot 5585 G4 Vertical Axis Label
Changes to Plot G20
Changes to Plots G30 and G35
Corrections to Plot G44 Horizontal Axis Label
Changes to Plot G61
Changes to Plot G78
Changes to Figure 1, RF and LO MATCH Table 1950MHz L6, C19 and L5 Component Values
Changes to Figure 5, 1.9GHz L6 and C19 Component Values
Change to Figure 13, 1.9GHz L5 Component Value
Added Reduced Power Consumption Paragraph Title
Correction to Figure 32 Title
Correction to text 1875Hz
3
6
8
10
11
13
15
18
20
22
29
29
31
B 11/14 Changes to Features and Description
Change to 700MHz IRR
Insert 3500MHz Data and Supply Current Condition
Correction to Plot G19 Vertical Axis Label
Correction to Plot G34 Vertical Axis Label
Correction to Plot G45 Horizontal Axis Label
Correction to Plot G60 Vertical Axis Label
Correction to Plot G77 Vertical Axis Label
Change to Figure 1 RF MATCH 2150MHz Table Values
Change to Figure 13 C13 and L5 Component Values
Change to text "lag (or lead)"
Omission of 6mA Current Arrows
Change in Figure 22 C Value
Change in Figure 33 ADC Output D15
Change in Typical Application ADC Output D15
1
3
4
8
10
11
13
15
18
22
23
24
26
30
38
LTC5585 L —H FEEL? E T *W“ E . WT \ "Tm 4|”: ® m K :> at :L’MIW'LL __ 4 "TM“; —L % Li? ? ¥ ? g E + G W13; —H— ' 38 L7ELUEN2
LTC5585
38
5585fb
For more information www.linear.com/LTC5585
LINEAR TECHNOLOGY CORPORATION 2012
LT 1114 REV B • PRINTED IN USA
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900 FAX: (408) 434-0507 www.linear.com/LTC5585
RELATED PARTS
TYPICAL APPLICATION
Simplified Schematic of 1950MHz Receiver, (Only I-Channel Is Shown)
D15
D0
CONTROL
VCM
VDD
LTC2185
ADC
1.8V
206mA
5V
200mA
AIN+
AIN
R20
105Ω
C22
62pF
C21
62pF
R19
105Ω
R16
35Ω
R15
35Ω
R5
110Ω
R4
110Ω
C23
1µF
5585 TA02
R18
83Ω
R17
83Ω
R10
100Ω
R12
10Ω
R8
440Ω
R9
440Ω
R7
30Ω
R6
30Ω
R11
10Ω
R13
138Ω
R14
138Ω
5V
52mA
C19
0.4pF
C20
0.4pF
C18
0.1µF
L12 180nH
L11 180nH
L8 180nH
L7 180nH
40MHz LOWPASS FILTER
L6 470nH
L3 4.7nH
L4 4.7nH T1
ANAREN BD2425J50200AHF
L5 470nH
L10 180nH
L9 180nH
C15
150pF
C16
150pF
C17
1µF
+
+
VOCMLTC6409
C13
150pF
C14
150pF
C12
47pF
C10
100pF
C11
100pF
LO INPUT
1950MHz
6dBm
C9
47pF
C7
0.5pF
C2
100pF
C8
0.5pF
I+
VCC
I
RF
LO
LO+
LTC5585
RF INPUT
1910MHz
TO
1990MHz
40MHz ANTI-ALIAS FILTER (AAF)
PART
NUMBER DESCRIPTION COMMENTS
Infrastructure
LTC5569 300MHz to 4GHz Dual Active Downconverting Mixer 2dB Gain, 26.7dBm IIP3 and 11.7dB NF at 1950MHz, 3.3V/180mA Supply
LT5527 400MHz to 3.7GHz, 5V Downconverting Mixer 2.3dB Gain, 23.5dBm IIP3 and 12.5dB NF at 1900MHz, 5V/78mA Supply
LT5557 400MHz to 3.8GHz, 3.3V Downconverting Mixer 2.9dB Gain, 24.7dBm IIP3 and 11.7dB NF at 1950MHz, 3.3V/82mA Supply
LTC6409 10GHz GBW Differential Amplifier DC-Coupled, 48dBm OIP3 at 140MHz, 1.1nV/√Hz Input Noise Density
LTC6412 31dB Linear Analog VGA 35dBm OIP3 at 240MHz, Continuous Gain Range –14dB to 17dB
LTC554X 600MHz to 4GHz Downconverting Mixer Family 8dB Gain, >25dBm IIP3, 10dB NF, 3.3V/200mA Supply
LT5554 Ultralow Distortion IF Digital VGA 48dBm OIP3 at 200MHz, 2dB to 18dB Gain Range, 0.125dB Gain Steps
LT5578 400MHz to 2.7GHz Upconverting Mixer 27dBm OIP3 at 900MHz, 24.2dBm at 1.95GHz, Integrated RF Transformer
LT5579 1.5GHz to 3.8GHz Upconverting Mixer 27.3dBm OIP3 at 2.14GHz, NF = 9.9dB, 3.3V Supply, Single-Ended LO and RF Ports
LTC5590 Dual 600MHz to 1.7GHz Downconverting Mixer 8.7dB Gain, 26dBm IIP3, 9.7dB Noise Figure
LTC5591 Dual 1.3GHz to 2.3GHz Downconverting Mixer 8.5dB Gain, 26.2dBm IIP3, 9.9dB Noise Figure
LTC5592 Dual 1.6GHz to 2.7GHz Downconverting Mixer 8.3dB Gain, 27.3dBm IIP3, 9.8dB Noise Figure
RF PLL/Synthesizer with VCO
LTC6946-1 Low Noise, Low Spurious Integer-N PLL with
Integrated VCO 373MHz to 3.74GHz, –157dBc/Hz WB Phase Noise Floor, –100dBc/Hz Closed-Loop
Phase Noise
LTC6946-2 Low Noise, Low Spurious Integer-N PLL with
Integrated VCO 513MHz to 4.9GHz, –157dBc/Hz WB Phase Noise Floor, –100dBc/Hz Closed-Loop
Phase Noise
LTC6946-3 Low Noise, Low Spurious Integer-N PLL with
Integrated VCO 640MHz to 5.79GHz, –157dBc/Hz WB Phase Noise Floor, –100dBc/Hz Closed-Loop
Phase Noise
ADCs
LTC2145-14 14-Bit, 125Msps 1.8V Dual ADC 73.1dB SNR, 90dB SFDR, 95mW/Ch Power Consumption
LTC2185 16-Bit, 125Msps 1.8V Dual ADC 76.8dB SNR, 90dB SFDR, 185mW/Channel Power Consumption
LTC2158-14 14-Bit, 310Msps 1.8V Dual ADC, 1.25GHz Full-Power
Bandwidth 68.8dB SNR, 88dB SFDR, 362mW/Ch Power Consumption, 1.32VP-P Input Range

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