ADR3412-50 Datasheet

Analog Devices Inc.

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Datasheet

Micropower, High Accuracy
Voltage References
ADR3412/ADR3420/ADR3425/ADR3430/ADR3433/ADR3440/ADR3450
Rev. C Document Feedback
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FEATURES
Initial accuracy: ±0.1% (maximum)
Maximum temperature coefficient: 8 ppm/°C
Operating temperature range: −40°C to +125°C
Output current: +10 mA source/−3 mA sink
Low quiescent current: 100 μA (maximum)
Low dropout voltage: 250 mV at 2 mA
Output noise (0.1 Hz to 10 Hz): <10 μV p-p at 1.2 V (typical)
6-lead SOT-23
APPLICATIONS
Precision data acquisition systems
Industrial instrumentation
Medical devices
Battery-powered devices
PIN CONFIGURATION
GND FORCE
1
GND SENSE
2
ENABLE
3
V
OUT
FORCE
6
V
OUT
SENSE
5
V
IN
4
ADR34xx
TOP VIEW
(Not to Scale)
08440-001
Figure 1. 6-Lead SOT-23
GENERAL DESCRIPTION
The ADR3412/ADR3420/ADR3425/ADR3430/ADR3433/
ADR3440/ADR3450 are low cost, low power, high precision
CMOS voltage references, featuring ±0.1% initial accuracy, low
operating current, and low output noise in a small SOT-23
package. For high accuracy, output voltage and temperature
coefficient are trimmed digitally during final assembly using
Analog Devices, Inc., proprietary DigiTrim® technology.
Stability and system reliability are further improved by the low
output voltage hysteresis of the device and low long-term output
voltage drift. Furthermore, the low operating current of the
device (100 μA maximum) facilitates usage in low power
devices, and its low output noise helps maintain signal integrity
in critical signal processing systems.
These CMOS are available in a wide range of output voltages, all
of which are specified over the industrial temperature range of
−40°C to +125°C.
Table 1. Selection Guide
Model Output Voltage (V) Input Voltage Range (V)
ADR3412 1.200 2.3 to 5.5
ADR3420 2.048 2.3 to 5.5
ADR3425 2.500 2.7 to 5.5
ADR3430 3.000 3.2 to 5.5
ADR3433 3.300 3.5 to 5.5
ADR3440 4.096 4.3 to 5.5
ADR3450 5.000 5.2 to 5.5
Table 2. Voltage Reference Choices from Analog Devices
VOUT
(V)
Low Cost/
Low Power
Ultralow
Power
Low
Noise
High Voltage,
High Performance
0.5/1.0 ADR130
1.2 ADR3412
ADR280
2.048 ADR360 REF191 ADR430
ADR3420 ADR440
2.5 ADR3425 ADR291 ADR431 ADR03
AD1582 REF192 ADR441 AD780
ADR361
3.0 ADR3430 REF193 ADR433 ADR06
AD1583
ADR363 ADR443 AD780
3.3 ADR366 REF196
ADR3433
4.096 ADR3440 ADR292 ADR434
AD1584
ADR364 REF198 ADR444
5.0 ADR3450 ADR293 ADR435 ADR02
AD1585 REF195 ADR445
ADR365 AD586
10.0 ADR01
AD587
ADR3412/ADR3420/ADR3425/ADR3430/ADR3433/ADR3440/ADR3450
Rev. C | Page 2 of 22
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications ....................................................................................... 1
Pin Configuration ............................................................................. 1
General Description ......................................................................... 1
Revision History ............................................................................... 2
Specifications ..................................................................................... 3
ADR3412 Electrical Characteristics........................................... 3
ADR3420 Electrical Characteristics........................................... 4
ADR3425 Electrical Characteristics........................................... 5
ADR3430 Electrical Characteristics........................................... 6
ADR3433 Electrical Characteristics........................................... 7
ADR3440 Electrical Characteristics........................................... 8
ADR3450 Electrical Characteristics........................................... 9
Absolute Maximum Ratings and Minimum Operating
Condition ......................................................................................... 10
Thermal Resistance .................................................................... 10
ESD Caution ................................................................................ 10
Pin Configuration and Function Descriptions ........................... 11
Typical Performance Characteristics ........................................... 12
Terminology .................................................................................... 18
Theory of Operation ...................................................................... 19
Long-Term Stability ................................................................... 19
Power Dissipation....................................................................... 19
Applications Information .............................................................. 20
Basic Voltage Reference Connection ....................................... 20
Input and Output Capacitors .................................................... 20
4-Wire Kelvin Connections ...................................................... 20
VIN Slew Rate Considerations ................................................... 20
Shutdown/Enable Feature ......................................................... 20
Sample Applications ................................................................... 21
Outline Dimensions ....................................................................... 22
Ordering Guide .......................................................................... 22
REVISION HISTORY
6/2018Rev. B to Rev. C
Change to General Description ...................................................... 1
Change to Figure 17 ....................................................................... 14
Change to Figure 23 ....................................................................... 15
Changes to Figure 35 and Figure 36 Caption ............................. 17
Changes to Theory of Operation Section .................................... 19
Change to Ordering Guide ............................................................ 22
6/2010Rev. A to Rev. B
Added ADR3412, ADR3420, ADR3433 ..................... Throughout
Changes to Table 1 and Table 2 ....................................................... 1
Added ADR3412 Electrical Characteristics Section
and Table 3 ......................................................................................... 3
Added ADR3420 Electrical Characteristics Section
and Table 4 ......................................................................................... 4
Added ADR3433 Electrical Characteristics Section and
Table 7, Renumbered Subsequent Tables ...................................... 7
Replaced Figure 5 Through Figure 7............................................ 12
Replaced Figure 11 Through Figure 13 ....................................... 13
4/2010Rev. 0 to Rev. A
Added ADR3430 and ADR3440....................................... Universal
Changes to Table 1, Table 2, and Figure 1 ...................................... 1
Changes to Table 3 ............................................................................. 3
Added ADR3430 Electrical Characteristics Section ..................... 4
Added Table 4; Renumbered Sequentially ..................................... 4
Added ADR3440 Electrical Characteristics Section and
Table 5 ................................................................................................. 5
Changes to Table 6 ............................................................................. 6
Changes to Figure 2 ........................................................................... 8
Changes to Figure 4 and Figure 5 .................................................... 9
Changes to Figure 11 ...................................................................... 10
Changes to Figure 36 and Figure 37 Caption ............................. 14
Changes to Figure 39 and Theory of Operation Section .......... 16
Changes to Figure 40 and Figure 41 ............................................ 17
Changes to Negative Reference Section, Boosted Output
Current Reference Section, Figure 43, and Figure 44 ................ 18
Changes to Ordering Guide .......................................................... 19
3/2010Revision 0: Initial Version
ADR3412/ADR3420/ADR3425/ADR3430/ADR3433/ADR3440/ADR3450
Rev. C | Page 3 of 22
SPECIFICATIONS
ADR3412 ELECTRICAL CHARACTERISTICS
VIN = 2.3 V to 5.5 V, TA = 25°C, ILOAD = 0 mA, unless otherwise noted.
Table 3.
Parameter Symbol Conditions Min Typ Max Unit
OUTPUT VOLTAGE VOUT 1.1988 1.2000 1.2012 V
INITIAL ACCURACY VOERR ±0.1 %
±1.2 mV
TEMPERATURE COEFFICIENT TCVOUT 40°C ≤ TA ≤ +125°C 8 ppm/°C
LINE REGULATION ΔVO/ΔVIN VIN = 2.3 V to 5.5 V 7 50 ppm/V
VIN = 2.3 V to 5.5 V, 40°C ≤ TA ≤ +125°C 160 ppm/V
LOAD REGULATION ΔVO/ΔIL
Sourcing IL = 0 mA to 10 mA,
VIN = 2.8 V, 40°C ≤ TA ≤ +125°C
14 30 ppm/mA
Sinking IL = 0 mA to −3 mA,
VIN = 2.8 V, 40°C ≤ TA ≤ +125°C
7 50 ppm/mA
OUTPUT CURRENT CAPACITY
I
L
Sourcing VIN = 2.8 V to 5.5 V 10 mA
Sinking VIN = 2.8 V to 5.5 V −3 mA
QUIESCENT CURRENT IQ
Normal Operation ENABLE > VIN × 0.85 85 μA
ENABLE = VIN, 40°C ≤ TA ≤ +125°C 100 μA
Shutdown ENABLE < 0.7 V 5 μA
DROPOUT VOLTAGE1VDO IL = 0 mA, 40°C ≤ TA ≤ +125°C 1 1.1 V
IL = 2 mA, 40°C ≤ TA ≤ +125°C 1 1.15 V
ENABLE PIN
Shutdown Voltage VL 0 0.7 V
ENABLE Voltage VH VIN × 0.85 VIN V
ENABLE Pin Leakage Current IEN ENABLE = VIN, 40°C TA ≤ +125°C 0.85 3 μA
OUTPUT VOLTAGE NOISE en p-p f = 0.1 Hz to 10 Hz 8 μV p-p
f = 10 Hz to 10 kHz 28 μV rms
OUTPUT VOLTAGE NOISE
DENSITY
en f = 1 kHz 0.6 μV/√Hz
OUTPUT VOLTAGE HYSTERESIS2ΔVOUT_HYS TA = +25°C to −40°C to +125°C to +25°C 70 ppm
RIPPLE REJECTION RATIO RRR fIN = 60 Hz 60 dB
LONG-TERM STABILITY ΔVOUT_LTD 1000 hours at 50°C 30 ppm
TURN-ON SETTLING TIME tR CIN = 0.1 μF, CL = 0.1 μF, RLoad = 1 k
100 μs
1 Refers to the minimum difference between VIN and VOUT such that VOUT maintains a minimum accuracy of 0.1%. See the Terminology section.
2 See the Terminology section. The part is placed through the temperature cycle in the order of temperatures shown.
ADR3412/ADR3420/ADR3425/ADR3430/ADR3433/ADR3440/ADR3450
Rev. C | Page 4 of 22
ADR3420 ELECTRICAL CHARACTERISTICS
VIN = 2.3 V to 5.5 V, TA = 25°C, ILOAD = 0 mA, unless otherwise noted.
Table 4.
Parameter Symbol Conditions Min Typ Max Unit
OUTPUT VOLTAGE VOUT 2.0459 2.0480 2.0500 V
INITIAL ACCURACY VOERR ±0.1 %
±2.048 mV
TEMPERATURE COEFFICIENT TCVOUT 40°C ≤ TA ≤ +125°C 8 ppm/°C
LINE REGULATION ΔVO/ΔVIN VIN = 2.3 V to 5.5 V 7 50 ppm/V
VIN = 2.3 V to 5.5 V, 40°C ≤ TA ≤ +125°C 160 ppm/V
LOAD REGULATION ΔVO/ΔIL
Sourcing IL = 0 mA to 10 mA,
VIN = 2.8 V, 40°C ≤ TA +125°C
12 30 ppm/mA
Sinking IL = 0 mA to −3 mA,
VIN = 2.8 V, 40°C ≤ TA +125°C
7 50 ppm/mA
OUTPUT CURRENT CAPACITY IL
Sourcing VIN = 2.8 V to 5.5 V 10 mA
Sinking VIN = 2.8 V to 5.5 V −3 mA
QUIESCENT CURRENT IQ
Normal Operation ENABLE > VIN × 0.85 85 μA
ENABLE = V
IN
, 40°C ≤ T
A
≤ +125°C
100
μA
Shutdown ENABLE < 0.7 V 5 μA
DROPOUT VOLTAGE
1
V
DO
I
L
= 0 mA, 40°C ≤ T
A
≤ +125°C
250
mV
IL = 2 mA, 40°C ≤ TA ≤ +125°C 150 300 mV
ENABLE PIN
Shutdown Voltage VL 0 0.7 V
ENABLE Voltage VH VIN × 0.85 VIN V
ENABLE Pin Leakage Current IEN ENABLE = VIN, 40°C ≤ TA +125°C 0.85 3 μA
OUTPUT VOLTAGE NOISE en p-p f = 0.1 Hz to 10 Hz 15 μV p-p
f = 10 Hz to 10 kHz 38 μV rms
OUTPUT VOLTAGE NOISE
DENSITY
en f = 1 kHz 0.9 μV/√Hz
OUTPUT VOLTAGE HYSTERESIS2 ΔVOUT_HYS TA = +25°C to −40°C to +125°C to +25°C 70 ppm
RIPPLE REJECTION RATIO RRR fIN = 60 Hz 60 dB
LONG-TERM STABILITY ΔVOUT_LTD 1000 hours at 50°C 30 ppm
TURN-ON SETTLING TIME tR CIN = 0.1 μF, CL = 0.1 μF, RLoad = 1 k
400 μs
1 Refers to the minimum difference between VIN and VOUT such that VOUT maintains a minimum accuracy of 0.1%. See the Terminology section.
2 See the Terminology section. The part is placed through the temperature cycle in the order of temperatures shown.
ADR3412/ADR3420/ADR3425/ADR3430/ADR3433/ADR3440/ADR3450
Rev. C | Page 5 of 22
ADR3425 ELECTRICAL CHARACTERISTICS
VIN = 2.7 V to 5.5 V, IL = 0 mA, TA = 25°C, unless otherwise noted.
Table 5.
Parameter Symbol Conditions Min Typ Max Unit
OUTPUT VOLTAGE VOUT 2.4975 2.500 2.5025 V
INITIAL ACCURACY VOERR ±0.1 %
±2.5 mV
TEMPERATURE COEFFICIENT TCVOUT 40°C ≤ TA +125°C 2.5 8 ppm/°C
LINE REGULATION ΔVO/ΔVIN VIN = 2.7 V to 5.5 V 5 50 ppm/V
VIN = 2.7 V to 5.5 V, 40°C ≤ TA ≤ +125°C 120 ppm/V
LOAD REGULATION ΔVO/ΔIL
Sourcing IL = 0 mA to 10 mA,
VIN = 3.0 V, 40°C TA ≤ +125°C
10 30 ppm/mA
Sinking IL = 0 mA to 3 mA,
VIN = 3.0 V, 40°C ≤ TA ≤ +125°C
10 50 ppm/mA
OUTPUT CURRENT CAPACITY IL
Sourcing VIN = 3.0 V to 5.5 V 10 mA
Sinking VIN = 3.0 V to 5.5 V −3 mA
QUIESCENT CURRENT IQ
Normal Operation ENABLE ≥ VIN × 0.85 85 μA
ENABLE = V
IN
, −40°C ≤ T
A
≤ +125°C
100
μA
Shutdown ENABLE ≤ 0.7 V 5 μA
DROPOUT VOLTAGE
1
V
DO
I
L
= 0 mA, T
A
= −40°C T
A
≤ +125°C
50
200
mV
IL = 2 mA, TA = −40°C TA ≤ +125°C 75 250 mV
ENABLE PIN
Shutdown Voltage VL 0 0.7 V
ENABLE Voltage VH VIN × 0.85 VIN V
ENABLE Pin Leakage Current IEN ENABLE = VIN, TA = −40°C ≤ TA ≤ +125°C 1 3 μA
OUTPUT VOLTAGE NOISE en p-p f = 0.1 Hz to 10 Hz 18 μV p-p
f = 10 Hz to 10 kHz 42 μV rms
OUTPUT VOLTAGE NOISE
DENSITY
en f = 1 kHz 1 µV/√Hz
OUTPUT VOLTAGE HYSTERESIS2 ΔVOUT_HYS TA = +25°C to −40°C to +125°C to +25°C 70 ppm
RIPPLE REJECTION RATIO RRR fIN = 60 Hz 60 dB
LONG-TERM STABILITY ΔVOUT_LTD 1000 hours at 50°C 30 ppm
TURN-ON SETTLING TIME tR CIN = 0.1 μF, CL = 0.1 μF, RLoad = 1 k
600 μs
1 Refers to the minimum difference between VIN and VOUT such that VOUT maintains a minimum accuracy of 0.1%. See the Terminology section.
2 See the Terminology section. The part is placed through the temperature cycle in the order of temperatures shown.
ADR3412/ADR3420/ADR3425/ADR3430/ADR3433/ADR3440/ADR3450
Rev. C | Page 6 of 22
ADR3430 ELECTRICAL CHARACTERISTICS
VIN = 3.2 V to 5.5 V, IL = 0 mA, TA = 25°C, unless otherwise noted.
Table 6.
Parameter Symbol Conditions Min Typ Max Unit
OUTPUT VOLTAGE VOUT 2.9970 3.0000 3.0030 V
INITIAL ACCURACY VOERR ±0.1 %
±3.0 mV
TEMPERATURE COEFFICIENT TCVOUT 40°C TA ≤ +125°C 2.5 8 ppm/°C
LINE REGULATION ΔVOVIN VIN = 3.2 V to 5.5 V 5 50 ppm/V
VIN = 3.2 V to 5.5 V, −40°C ≤ TA ≤ +125°C 120 ppm/V
LOAD REGULATION ΔVO/ΔIL
Sourcing IL = 0 mA to 10 mA,
VIN = 3.5 V,40°C ≤ TA ≤ +125°C
9 30 ppm/mA
Sinking IL = 0 mA to −3 mA,
VIN = 3.5 V, 40°C ≤ TA ≤ +125°C
10 50 ppm/mA
OUTPUT CURRENT CAPACITY IL
Sourcing VIN = 3.5 V to 5.5 V 10 mA
Sinking VIN = 3.5 V to 5.5 V −3 mA
QUIESCENT CURRENT IQ
Normal Operation ENABLE ≥ VIN × 0.85 85 μA
ENABLE = V
IN
, −40°C ≤ T
A
≤ +125°C
100
μA
Shutdown ENABLE ≤ 0.7 V 5 μA
DROPOUT VOLTAGE
1
V
DO
I
L
= 0 mA, T
A
= −40°C T
A
≤ +125°C
50
200
mV
IL = 2 mA, TA = −40°C TA ≤ +125°C 75 250 mV
ENABLE PIN
Shutdown Voltage VL 0 0.7 V
ENABLE Voltage VH VIN × 0.85 VIN V
ENABLE Pin Leakage Current IEN ENABLE = VIN, TA = −40°C ≤ TA ≤ +125°C 0.85 3 μA
OUTPUT VOLTAGE NOISE en p-p f = 0.1 Hz to 10 Hz 22 μV p-p
f = 10 Hz to 10 kHz 45 μV rms
OUTPUT VOLTAGE NOISE DENSITY en f = 1 kHz 1.1 µV/√Hz
OUTPUT VOLTAGE HYSTERESIS2 ΔVOUT_HYS TA = +25°C to 40°C to +125°C to +25°C 70 ppm
RIPPLE REJECTION RATIO RRR fIN = 60 Hz 60 dB
LONG-TERM STABILITY ΔVOUT_LTD 1000 hours at 50°C 30 ppm
TURN-ON SETTLING TIME tR CIN = 0.1 μF, CL = 0.1 μF, RLoad = 1 k
700 μs
1 Refers to the minimum difference between VIN and VOUT such that VOUT maintains a minimum accuracy of 0.1%. See the Terminology section.
2 See the Terminology section. The part is placed through the temperature cycle in the order of temperatures shown.
ADR3412/ADR3420/ADR3425/ADR3430/ADR3433/ADR3440/ADR3450
Rev. C | Page 7 of 22
ADR3433 ELECTRICAL CHARACTERISTICS
VIN = 3.5 V to 5.5 V, IL = 0 mA, TA = 25°C, unless otherwise noted.
Table 7.
Parameter Symbol Conditions Min Typ Max Unit
OUTPUT VOLTAGE VOUT 3.2967 3.30 3.3033 V
INITIAL ACCURACY VOERR ±0.1 %
±3.3 mV
TEMPERATURE COEFFICIENT TCVOUT −40°C ≤ TA ≤ +125°C 8 ppm/°C
LINE REGULATION ΔVO/ΔVIN VIN = 3.5 V to 5.5 V 5 50 ppm/V
VIN = 3.5 V to 5.5 V, −40°C TA ≤ +125°C 120 ppm/V
LOAD REGULATION ΔVO/ΔIL
Sourcing IL = 0 mA to 10 mA,
VIN = 3.8 V, −40°C ≤ TA ≤ +125°C
9 30 ppm/mA
Sinking IL = 0 mA to −3 mA,
VIN = 3.8 V, −40°C ≤ TA ≤ +125°C
10 50 ppm/mA
OUTPUT CURRENT CAPACITY IL
Sourcing VIN = 3.8 V to 5.5 V 10 mA
Sinking VIN = 3.8 V to 5.5 V −3 mA
QUIESCENT CURRENT IQ
Normal Operation ENABLE > VIN × 0.85 85 μA
ENABLE = VIN, −40°C ≤ TA +125°C 100 μA
Shutdown ENABLE < 0.7 V 5 μA
DROPOUT VOLTAGE1 VDO IL = 0 mA, −40°C ≤ TA ≤ +125°C 50 200 mV
I
L
= 2 mA, −40°C ≤ T
A
≤ +125°C
75
250
mV
ENABLE PIN
Shutdown Voltage VL 0 0.7 V
ENABLE Voltage VH VIN × 0.85 VIN V
ENABLE Pin Leakage Current IEN ENABLE = VIN, −40°C ≤ TA ≤ +125°C 0.85 3 μA
OUTPUT VOLTAGE NOISE en p-p f = 0.1 Hz to 10 Hz 25 μV p-p
f = 10 Hz to 10 kHz 46 μV rms
OUTPUT VOLTAGE NOISE DENSITY en f = 1 kHz 1.2 μV/√Hz
OUTPUT VOLTAGE HYSTERESIS2 ΔVOUT_HYS TA = +25°C to −40°C to +125°C to +25°C 70 ppm
RIPPLE REJECTION RATIO RRR fIN = 60 Hz -60 dB
LONG-TERM STABILITY ΔVOUT_LTD 1000 hours at 50°C 30 ppm
TURN-ON SETTLING TIME tR CIN = 0.1 μF, CL = 0.1 μF, RLoad = 1 k
750 μs
1 Refers to the minimum difference between VIN and VOUT such that VOUT maintains a minimum accuracy of 0.1%. See the Terminology section.
2 See the Terminology section. The part is placed through the temperature cycle in the order of temperatures shown.
ADR3412/ADR3420/ADR3425/ADR3430/ADR3433/ADR3440/ADR3450
Rev. C | Page 8 of 22
ADR3440 ELECTRICAL CHARACTERISTICS
VIN = 4.3 V to 5.5 V, IL = 0 mA, TA = 25°C, unless otherwise noted.
Table 8.
Parameter Symbol Conditions Min Typ Max Unit
OUTPUT VOLTAGE VOUT 4.0919 4.0960 4.1000 V
INITIAL ACCURACY VOERR ±0.1 %
±4.096 mV
TEMPERATURE COEFFICIENT TCVOUT 40°C ≤ TA +125°C 2.5 8 ppm/°C
LINE REGULATION ΔVOVIN VIN = 4.3 V to 5.5 V 3 50 ppm/V
VIN = 4.3 V to 5.5 V, −40°C ≤ TA ≤ +125°C 120 ppm/V
LOAD REGULATION ΔVO/ΔIL
Sourcing IL = 0 mA to 10 mA,
VIN = 4.6 V,40°C ≤ TA ≤ +125°C
6 30 ppm/mA
Sinking IL = 0 mA to −3 mA,
VIN = 4.6 V, 40°C ≤ TA ≤ +125°C
15 50 ppm/mA
OUTPUT CURRENT CAPACITY IL
Sourcing VIN = 4.6 V to 5.5 V 10 mA
Sinking VIN = 4.6 V to 5.5 V −3 mA
QUIESCENT CURRENT IQ
Normal Operation ENABLE ≥ VIN × 0.85 85 μA
ENABLE = V
IN
, −40°C ≤ T
A
≤ +125°C
100
μA
Shutdown ENABLE ≤ 0.7 V 5 μA
DROPOUT VOLTAGE
1
V
DO
I
L
= 0 mA, T
A
= −40°C T
A
≤ +125°C
50
200
mV
IL = 2 mA, TA = −40°C ≤ TA +125°C 75 250 mV
ENABLE PIN
Shutdown Voltage VL 0 0.7 V
ENABLE Voltage VH VIN × 0.85 VIN V
ENABLE Pin Leakage Current IEN ENABLE = VIN, TA = −40°C ≤ TA ≤ +125°C 3 μA
OUTPUT VOLTAGE NOISE en p-p f = 0.1 Hz to 10 Hz 29 μV p-p
f = 10 Hz to 10 kHz 53 μV rms
OUTPUT VOLTAGE NOISE
DENSITY
en f = 1 kHz 1.4 µV/√Hz
OUTPUT VOLTAGE HYSTERESIS2 ΔVOUT_HYS TA = +25°C to −40°C to +125°C to +25°C 70 ppm
RIPPLE REJECTION RATIO RRR fIN = 60 Hz −60 dB
LONG-TERM STABILITY ΔVOUT_LTD 1000 hours at 50°C 30 ppm
TURN-ON SETTLING TIME tR CIN = 0.1 μF, CL = 0.1 μF, RLoad = 1 k
800 μs
1 Refers to the minimum difference between VIN and VOUT such that VOUT maintains a minimum accuracy of 0.1%. See the Terminology section.
2 See the Terminology section. The part is placed through the temperature cycle in the order of temperatures shown.
ADR3412/ADR3420/ADR3425/ADR3430/ADR3433/ADR3440/ADR3450
Rev. C | Page 9 of 22
ADR3450 ELECTRICAL CHARACTERISTICS
VIN = 5.2 V to 5.5 V, IL = 0 mA, TA = 25°C, unless otherwise noted.
Table 9.
Parameter Symbol Conditions Min Typ Max Unit
OUTPUT VOLTAGE VOUT 4.9950 5.0000 5.0050 V
INITIAL ACCURACY VOERR ±0.1 %
±5.0 mV
TEMPERATURE COEFFICIENT TCVOUT 40°C ≤ TA +125°C 2.5 8 ppm/°C
LINE REGULATION ΔVO/ΔVIN VIN = 5.2 V to 5.5 V 3 50 ppm/V
VIN = 5.2 V to 5.5 V, 40°C ≤ TA ≤ +125°C 120 ppm/V
LOAD REGULATION ΔVO/ΔIL
Sourcing IL = 0 mA to 10 mA,
VIN = 5.5 V,40°C TA ≤ +125°C
3 30 ppm/mA
Sinking IL = 0 mA to 3 mA,
VIN = 5.5 V, 40°C ≤ TA ≤ +125°C
19 50 ppm/mA
OUTPUT CURRENT CAPACITY IL
Sourcing VIN = 5.5 V 10 mA
Sinking VIN = 5.5 V −3 mA
QUIESCENT CURRENT IQ
Normal Operation ENABLE ≥ VIN × 0.85 85 μA
ENABLE = V
IN
, −40°C ≤ T
A
≤ +125°C
100
μA
Shutdown ENABLE ≤ 0.7 V 5 μA
DROPOUT VOLTAGE
1
V
DO
I
L
= 0 mA, T
A
= −40°C ≤ T
A
≤ +125°C
50
200
mV
IL = 2 mA, TA = −40°C ≤ TA ≤ +125°C 75 250 mV
ENABLE PIN
Shutdown Voltage VL 0 0.7 V
ENABLE Voltage VH VIN × 0.85 VIN V
ENABLE Pin Leakage Current IEN ENABLE = VIN, TA = −40°C ≤ TA ≤ +125°C 1 3 μA
OUTPUT VOLTAGE NOISE en p-p f = 0.1 Hz to 10 Hz 35 μV p-p
f = 10 Hz to 10 kHz 60 μV rms
OUTPUT VOLTAGE NOISE
DENSITY
en f = 1 kHz 1.5 µV/√Hz
OUTPUT VOLTAGE HYSTERESIS2 ΔVOUT_HYS TA = +25°C to −40°C to +125°C to +25°C 70 ppm
RIPPLE REJECTION RATIO RRR fIN = 60 Hz 58 dB
LONG-TERM STABILITY ΔVOUT_LTD 1000 hours at 50°C 30 ppm
TURN-ON SETTLING TIME tR CIN = 0.1 μF, CL = 0.1 μF, RLoad = 1 k
900 µs
1 Refers to the minimum difference between VIN and VOUT such that VOUT maintains a minimum accuracy of 0.1%. See the Terminology section.
2 See the Terminology section. The part is placed through the temperature cycle in the order of temperatures shown.
ADR3412/ADR3420/ADR3425/ADR3430/ADR3433/ADR3440/ADR3450
Rev. C | Page 10 of 22
ABSOLUTE MAXIMUM RATINGS AND MINIMUM OPERATING CONDITION
TA = 25°C, unless otherwise noted.
Table 10.
Parameter Rating
Supply Voltage 6 V
ENABLE to GND SENSE Voltage VIN
VIN Minimum Slew Rate 0.1 V/ms
Operating Temperature Range
40°C to +125°C
Storage Temperature Range 65°C to +125°C
Junction Temperature Range 65°C to +150°C
Stresses at or above those listed under Absolute Maximum
Ratings may cause permanent damage to the product. This is a
stress rating only; functional operation of the product at these
or any other conditions above those indicated in the operational
section of this specification is not implied. Operation beyond
the maximum operating conditions for extended periods may
affect product reliability.
THERMAL RESISTANCE
θJA is specified for the worst-case conditions, that is, a device
soldered in a circuit board for surface-mount packages.
Table 11. Thermal Resistance
Package Type θJA θJC Unit
6-Lead SOT-23 (RJ-6) 230 92 °C/W
ESD CAUTION
ADR3412/ADR3420/ADR3425/ADR3430/ADR3433/ADR3440/ADR3450
Rev. C | Page 11 of 22
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
0
8440-002
GND FORCE
1
GND SENSE
2
ENABLE
3
V
OUT
FORCE
6
V
OUT
SENSE
5
V
IN
4
ADR34xx
TOP VIEW
(Not to Scale)
Figure 2. Pin Configuration
Table 12. Pin Function Descriptions
Pin No. Mnemonic Description
1 GND FORCE Ground Force Connection.1
2 GND SENSE Ground Voltage Sense Connection. Connect directly to the point of lowest potential in the application.1
3 ENABLE Enable Connection. Enables or disables the device.
4 VIN Input Voltage Connection.
5 VOUT SENSE Reference Voltage Output Sensing Connection. Connect directly to the voltage input of the load devices.1
6 VOUT FORCE Reference Voltage Output.1
1 See the Applications Information section for more information on force/sense connections.
ADR3412/ADR3420/ADR3425/ADR3430/ADR3433/ADR3440/ADR3450
Rev. C | Page 12 of 22
TYPICAL PERFORMANCE CHARACTERISTICS
TA = 25°C, unless otherwise noted.
2.4990
2.4992
2.4994
2.4996
2.4998
2.5000
2.5002
2.5004
2.5006
2.5008
2.5010
–40 –25 –10 520 35 50 65 80 95 110 125
OUTPUT VOLTAGE (V)
TEMPERATURE (ºC)
V
IN
= 5.5V
08440-003
Figure 3. ADR3425 Output Voltage vs. Temperature
0
5
10
15
20
25
30
35
40
0 1 2 3 4 5 6 7 8 9 10 11
NUMBER OF DEVICES
TEMPERATURE COEFFICIENT (ppm/°C)
08440-005
Figure 4. ADR3425 Temperature Coefficient Distribution
0
2
4
6
8
10
12
14
16
18
20
22
24
–40 –25 –10 520 35 50 65 80 95 110 125
LOAD REGULATION (ppm/mA)
TEMPERATURE (°C)
I
L
= 0mA TO +10mA
SOURCING
08440-053
ADR3412
ADR3420
ADR3425
ADR3430
ADR3433
ADR3440
ADR3450
Figure 5. Load Regulation vs. Temperature (Sourcing)
4.9975
4.9980
4.9985
4.9990
4.9995
5.0000
5.0005
5.0010
5.0015
5.0020
5.0025
–40 –25 –10 520 35 50 65 80 95 110 125
OUTPUT VOLTAGE (V)
TEMPERATURE (ºC)
V
IN
= 5.5V
08440-004
Figure 6. ADR3450 Output Voltage vs. Temperature
0
5
10
15
20
25
30
40
35
45
0 1 2 3 4 5 6 7 8 9 10 MORE
NUMBER OF DEVICES
TEMPERA
TURE COEFFICIENT (ppm/°C)
08440-006
Figure 7. ADR3450 Temperature Coefficient Distribution
–40 –25 –10 520 35 50 65 80 95 110 125
LOAD REGULATION (ppm/mA)
TEMPERATURE (°C)
I
L
= 0mA TO –3mA
SINKING
08440-054
ADR3412
ADR3420
ADR3425
ADR3430
ADR3433
ADR3440
ADR3450
5
10
15
20
25
30
35
Figure 8. Load Regulation vs. Temperature (Sinking)
ADR3412/ADR3420/ADR3425/ADR3430/ADR3433/ADR3440/ADR3450
Rev. C | Page 13 of 22
0.80
0.85
0.90
0.95
1.00
1.05
1.10
1.15
1.20
321012345678910
DIFFERENTIAL VOLTAGE (V)
LOAD CURRENT (mA)
T
A
= –40°C
T
A
= +25°C
T
A
= +125°C
08440-056
Figure 9. ADR3412 Dropout Voltage vs. Load Current
321012345678910
DIFFERENTIAL VOLTAGE (mV)
LOAD CURRENT (mA)
08440-057
–50
0
50
100
150
200
250
300
350
400
450
T
A
= –40°C
T
A
= +25°C
T
A
= +125°C
Figure 10. ADR3420 Dropout Voltage vs. Load Current
08440-055
CH1 500mV CH2 2.00V M100µs A CH2 2.36V
2
1
V
IN
= 2V/DIV
C
IN
= C
OUT
= 0.F
R
L
= 1k
V
OUT
= 500mV/DIV
FREQUENCY GEN = 1Hz
Figure 11. ADR3412 Start-Up (Turn-On Settle) Time
0
50
100
150
200
250
300
350
400
321012345678910
DIFFERENTI
A
L VOLTAGE (mV)
LOAD CURRENT (mA)
–40°C
+25°C
+125°C
08440-015
Figure 12. ADR3425 Dropout Voltage vs. Load Current
0
50
100
150
200
250
300
350
DIFFERENTI
A
L VOLTAGE (mV)
LOAD CURRENT (mA)
–40°C
+25°C
+125°C
321012345678910
08440-016
Figure 13. ADR3450 Dropout Voltage vs. Load Current
0
20
40
60
80
100
120
140
–40 –25 –10 5 20 35 50 65 80 95 110 125
LINE REGUL
A
TION (ppm/V)
TEMPERATURE (°C)
ADR3412
ADR3420
ADR3425
ADR3430
ADR3433
ADR3440
ADR3450
08440-052
Figure 14. Line Regulation vs. Temperature
ADR3412/ADR3420/ADR3425/ADR3430/ADR3433/ADR3440/ADR3450
Rev. C | Page 14 of 22
08440-028
CH1 pk-pk = 18µV CH1 RMS = 3.14µV
1
10µV/DIV
TIME = 1s/DIV
Figure 15. ADR3425 Output Voltage Noise (0.1 Hz to 10 Hz)
08440-029
CH1 pk-pk = 300µV CH1 RMS = 42.0µV
1
100µV/DIV
TIME = 1s/DIV
Figure 16. ADR3425 Output Voltage Noise (10 Hz to 10 kHz)
100
1k
10k
0.1 1 10 100 1k 10k
NOISE DENSITY (nV/Hz)
FREQUENCY (Hz)
08440-023
Figure 17. ADR3425 Output Noise Spectral Density
–90
–80
–70
–60
–50
–40
–30
–20
–10
0
10 100 1k 10k 100k
RIPPLE REJECTION R
A
TIO (dB
V
OUT
/
V
IN
)
FREQUENCY (Hz)
C
L
= 1.1µF
C
IN
= 0.1µF
08440-025
Figure 18. ADR3425 Ripple Rejection Ratio vs. Frequency
08440-030
1
2
C
IN
= C
L
= 0.F
R
L
=
V
OUT
= 1V/DIV
V
IN
= 2V/DIV
TIME = 200µs/DIV
Figure 19. ADR3425 Start-Up Response
08440-031
1
2
V
ENABLE
= 1V/DIV
V
IN
= 3.0v
C
IN
= C
L
= 0.F
R
L
=
V
OUT
= 1V/DIV
ENABLE
TIME = 200µs/DIV
Figure 20. ADR3425 Restart Response from Shutdown
ADR3412/ADR3420/ADR3425/ADR3430/ADR3433/ADR3440/ADR3450
Rev. C | Page 15 of 22
08440-032
CH1 pk-pk = 33.4µV CH1 RMS = 5.68µV
1
10µV/DIV
Figure 21. ADR3450 Output Voltage Noise (0.1 Hz to 10 Hz)
08440-033
CH1 pk-pk = 446µV CH1 RMS = 60.3µV
1
100µV/DIV
Figure 22. ADR3450 Output Voltage Noise (10 Hz to 10 kHz)
1k
10k
0.1 1 10 100 1k 10k
NOISE DENSITY (nV/Hz)
FREQUENCY (Hz)
08440-024
Figure 23. ADR3450 Output Noise Spectral Density
–90
–80
–70
–60
–50
–40
–30
–20
–10
0
10 100 1k 10k 100k
RIPPLE REJECTION R
A
TIO (dB
V
OUT
/
V
IN
)
FREQUENCY (Hz)
C
L
= 1.1µF
C
IN
= 0.1µF
08440-026
Figure 24. ADR3450 Ripple Rejection Ratio vs. Frequency
08440-034
1
2
TIME = 200µs/DIV
CIN = 0µF
CL = 0.F
RL =
VIN
2V/DIV
VOUT
2V/DIV
Figure 25. ADR3450 Start-Up Response
08440-035
1
2
V
ENABLE
= 2V/DIV
V
IN
= 5.5V
C
IN
= C
L
= 0.F
R
L
=
V
OUT
= 2V/DIV
ENABLE
TIME = 200µs/DIV
Figure 26. ADR3450 Restart Response from Shutdown
ADR3412/ADR3420/ADR3425/ADR3430/ADR3433/ADR3440/ADR3450
Rev. C | Page 16 of 22
08440-036
1
2
C
IN
= C
L
= 0.F
V
IN
= 3V
R
L
= 1k
V
OUT
= 1V/DIV
ENABLE
1V/DIV
TIME = 200µs/DIV
Figure 27. ADR3425 Shutdown Response
08440-037
1
2
C
IN
= C
L
= 0.1µF
V
OUT
= 10mV/DIV
500mV/DIV
3.2V
2.7V
TIME = 1ms/DIV
Figure 28. ADR3425 Line Transient Response
08440-038
C
IN
= 0.F
C
L
= 0.1µF
R
L
= 250
V
OUT
= 20mV/DIV
SINKING SINKING
–3mA
2.5V
+10mA
SOURCING
I
L
TIME = 1ms/DIV
Figure 29. ADR3425 Load Transient Response
08440-039
1
2
C
IN
= C
L
= 0.F
V
IN
= 5V
R
L
= 1k
V
OUT
= 2V/DIV
ENABLE
2V/DIV
TIME = 200µs/DIV
Figure 30. ADR3450 Shutdown Response
08440-040
1
2
C
IN
= C
L
= 0.F
V
OUT
= 5mV/DIV
V
IN
= 100mV/DIV
5.5V
5.2V
TIME = 1ms/DIV
Figure 31. ADR3450 Line Transient Response
08440-041
CIN = 0.1µF
CL = 0.F
RL = 500
VOUT = 20mV/DIV
SINKING SINKING
–3mA
5.0V
+10mA
SOURCING
IL
TIME = 1ms/DIV
Figure 32. ADR3450 Load Transient Response
ADR3412/ADR3420/ADR3425/ADR3430/ADR3433/ADR3440/ADR3450
Rev. C | Page 17 of 22
0
10
20
30
40
50
60
70
80
90
100
–40 –25 –10 520 35 50 65 80 95 110 125
SUPPLY CURRENT (µA)
TEMPERATURE (°C)
V
IN
= 5.5 V
08440-042
Figure 33. Supply Current vs. Temperature
0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
2.0
010 20 30 40 50 60 70 80 90 100
SUPPLY CURRENT (mA)
ENABLE VOLTAGE (% of V
IN
)
–40°C
+25°C
+125°C
08440-008
Figure 34. Supply Current vs. ENABLE Pin Voltage
0.01
0.1
1
10
10 100 1k 10k 100k 1M 10M
OUTPUT IMPEDANCE (Ω)
FREQUENCY (Hz)
C
L
= 0.1µF
C
L
= 1.1µF
08440-027
Figure 35. ADR3450 Output Impedance vs. Frequency
0
1
2
3
4
5
6
7
–0.050
–0.045
–0.040
–0.035
–0.030
–0.025
–0.020
–0.015
–0.010
–0.005
0
0.005
0.010
0.015
0.020
0.025
0.030
0.035
0.040
0.045
0.050
0.055
NUMBER OF DEVICES
RELATIVE SHIFT IN V
OUT
(%)
08440-043
Figure 36. Output Voltage Shift Distribution After Reflow (SHR Drift)
0
1
2
3
4
5
6
7
8
–150
–140
–130
–120
–110
–100
–90
–80
–70
–60
–50
–40
–30
–20
–10
0
10
20
30
40
NUMBER OF DEVICES
OUTPUT VOLTAGE HYSTERESIS (ppm)
T
A
= +25°C → +150°C → –50°C → +25°C
08440-044
Figure 37. ADR3450 Thermally Induced Output Voltage Hysteresis Distribution
80
60
40
20
0
–20
–40
–60
–80 0200 400 800600 1000
08440-045
LONG-TERM OUTPUT VOLTAGE DRIFT (ppm)
ELAPSED TIME (Hours)
Figure 38. ADR3450 Typical Long-Term Output Voltage Drift
(Four Devices, 1000 Hours)
ADR3412/ADR3420/ADR3425/ADR3430/ADR3433/ADR3440/ADR3450
Rev. C | Page 18 of 22
TERMINOLOGY
Dropout Voltage (VDO)
Dropout voltage, sometimes referred to as supply voltage
headroom or supply-output voltage differential, is defined as
the minimum voltage differential between the input and output
such that the output voltage is maintained to within 0.1%
accuracy.
VDO = (VIN − VOUT)min | IL = constant
Because the dropout voltage depends upon the current passing
through the device, it is always specified for a given load current.
In series-mode devices, dropout voltage typically increases
proportionally to load current (see Figure 8 and Figure 14).
Temperature Coefficient (TCVOUT)
The temperature coefficient relates the change in output voltage
to the change in ambient temperature of the device, as normalized
by the output voltage at 25°C. This parameter is expressed in
ppm/°C and can be determined by the following equation:
( )
{ }
( )
{ }
( )
( )
[ ]
123 123
2 31
6
max , , min , ,
10 ppm/°C
OUT OUT
OUT
OUT
V TTT V TTT
TCV V T TT
= ×
×−
(1)
where:
VOUT(T) is the output voltage at Temperature T.
T1 = −40°C.
T2 = +25°C.
T3 = +125°C.
This three-point method ensures that TCVOUT accurately
portrays the maximum difference between any of the three
temperatures at which the output voltage of the part is
measured.
The TCVOUT for the ADR3412/ADR3425/ADR3430/ADR3433/
ADR3440/ADR3450 is guaranteed via statistical means. This is
accomplished by recording output voltage data for a large
number of units over temperature, computing TCVOUT for each
individual device via Equation 1, then defining the maximum
TCVOUT limits as the mean TCVOUT for all devices extended by
six standard deviations (6σ).
Thermally Induced Output Voltage Hysteresis (ΔVOUT_HYS)
Thermally induced output voltage hysteresis represents the
change in output voltage after the device is exposed to a
specified temperature cycle. This is expressed as either a shift in
voltage or a difference in ppm from the nominal output.
__
(25 C)
OUT HYS OUT OUT TC
VV V = °−
[V]
_6
_
(25 C) 10
(25 C)
OUT OUT TC
OUT HYS
OUT
VV
VV
°−
∆= ×
°
[ppm]
where:
VOUT(25°C) is the output voltage at 25°C.
VOUT_TC is the output voltage after temperature cycling.
Long-Term Stability (ΔVOUT_LTD)
Long-term stability refers to the shift in output voltage at 50°C
after 1000 hours of operation in a 50°C environment. Ambient
temperature is kept at 50°C to ensure that the temperature
chamber does not switch randomly between heating and cooling,
which can cause instability over the 1000 hour measurement.
This is also expressed as either a shift in voltage or a difference
in ppm from the nominal output.
( )
( )
_ 10OUT LTD OUT OUT
V V tV t∆=
[V]
( )
( )
( )
10
6
_
0
10
OUT OUT
OUT LTD
OUT
V tV t
VVt
∆= ×
[ppm]
where:
VOUT(t0) is the VOUT at 50°C at Time 0.
VOUT(t1) is the VOUT at 50°C after 1000 hours of operation
at 50°C.
Line Regulation
Line regulation refers to the change in output voltage in response
to a given change in input voltage and is expressed in percent
per volt, ppm per volt, or μV per volt change in input voltage.
This parameter accounts for the effects of self-heating.
Load Regulation
Load regulation refers to the change in output voltage in
response to a given change in load current and is expressed in
μV per mA, ppm per mA, or ohms of dc output resistance. This
parameter accounts for the effects of self-heating.
Solder Heat Resistance (SHR) Drift
SHR drift refers to the permanent shift in output voltage
induced by exposure to reflow soldering, expressed in units of
ppm. This is caused by changes in the stress exhibited upon the
die by the package materials when exposed to high tempera-
tures. This effect is more pronounced in lead-free soldering
processes due to higher reflow temperatures.
ADR3412/ADR3420/ADR3425/ADR3430/ADR3433/ADR3440/ADR3450
Rev. C | Page 19 of 22
THEORY OF OPERATION
BAND GAP
VOLTAGE
REFERENCE
ENABLE
GND FORCE
V
OUT
FORCE
V
OUT
SENSE
R
FB2
R
FB1
V
IN
V
BG
GND SENSE
08440-046
Figure 39. Block Diagram
The ADR3412/ADR3425/ADR3430/ADR3433/ADR3440/
ADR3450 use a proprietary voltage reference architecture to
achieve high accuracy, low temperature coefficient (TC), and
low noise in a CMOS process. Like all band gap references, the
references combine two voltages of opposite TCs to create an
output voltage that is nearly independent of ambient temper-
ature. However, unlike traditional band gap voltage references, the
temperature-independent voltage of the references is arranged to
be the base-emitter voltage, VBE, of a bipolar transistor at room
temperature rather than the VBE extrapolated to 0 K (the VBE of
bipolar transistor at 0 K is approximately VG0, the band gap
voltage of silicon). A corresponding positive-TC voltage is then
added to the VBE voltage to compensate for its negative TC.
The key benefit of this technique is that the trimming of the
initial accuracy and TC can be performed without interfering
with one another, thereby increasing overall accuracy across
temperature. Curvature correction techniques further reduce
the temperature variation.
The band gap voltage (VBG) is then buffered and amplified to
produce stable output voltages of 2.5 V and 5.0 V. The output
buffer can source up to 10 mA and sink up to −3 mA of load
current.
The ADR34xx family leverages Analog Devices proprietary
DigiTrim technology to achieve high initial accuracy and low
TC, and precision layout techniques lead to very low long-term
drift and thermal hysteresis.
LONG-TERM STABILITY
One of the key parameters of the ADR34xx references is long-
term stability. Regardless of output voltage, internal testing
during development showed a typical drift of approximately
30 ppm after 1000 hours of continuous, nonloaded operation
in a 50°C environment.
It is important to understand that long-term stability is not
guaranteed by design and that the output from the device may
shift beyond the typical 30 ppm specification at any time,
especially during the first 200 hours of operation. For systems
that require highly stable output voltages over long periods of
time, the designer should consider burning in the devices prior
to use to minimize the amount of output drift exhibited by the
reference over time. See the AN-713 Application Note, The
Effect of Long-Term Drift on Voltage References, at www.analog.com
for more information regarding the effects of long-term drift
and how it can be minimized.
POWER DISSIPATION
The ADR34xx voltage references are capable of sourcing up to
10 mA of load current at room temperature across the rated
input voltage range. However, when used in applications subject
to high ambient temperatures, the input voltage and load cur-
rent should be carefully monitored to ensure that the device
does not exceeded its maximum power dissipation rating. The
maximum power dissipation of the device can be calculated via
the following equation:
[ ]
JA
D
JA
TT
PW
=θ
where:
PD is the device power dissipation.
TJ is the device junction temperature.
TA is the ambient temperature.
θJA is the package (junction-to-air) thermal resistance.
Because of this relationship, acceptable load current in high
temperature conditions may be less than the maximum current-
sourcing capability of the device. In no case should the part be
operated outside of its maximum power rating because doing so
can result in premature failure or permanent damage to the device.
ADR3412/ADR3420/ADR3425/ADR3430/ADR3433/ADR3440/ADR3450
Rev. C | Page 20 of 22
APPLICATIONS INFORMATION
BASIC VOLTAGE REFERENCE CONNECTION
V
IN
2.7V TO
5.5V
V
OUT
2.5V
0.1µF1µF 0.1µF
ADR34xx
V
IN
ENABLE
V
OUT
FORCE
V
OUT
SENSE
GND FORCE
GND SENSE
4
3
6
5
2
1
08440-047
Figure 40. Basic Reference Connection
The circuit shown in Figure 40 illustrates the basic configuration
for the ADR34xx references. Bypass capacitors should be
connected according to the following guidelines.
INPUT AND OUTPUT CAPACITORS
A 1 μF to 10 μF electrolytic or ceramic capacitor can be
connected to the input to improve transient response in
applications where the supply voltage may fluctuate. An
additional 0.1 μF ceramic capacitor should be connected
in parallel to reduce high frequency supply noise.
A ceramic capacitor of at least a 0.1 μF must be connected to
the output to improve stability and help filter out high fre-
quency noise. An additional 1 μF to 10 μF electrolytic or
ceramic capacitor can be added in parallel to improve transient
performance in response to sudden changes in load current;
however, the designer should keep in mind that doing so
increases the turn-on time of the device.
Best performance and stability is attained with low ESR (for
example, less than 1 Ω), low inductance ceramic chip-type
output capacitors (X5R, X7R, or similar). If using an electrolytic
capacitor on the output, a 0.1 µF ceramic capacitor should be
placed in parallel to reduce overall ESR on the output.
4-WIRE KELVIN CONNECTIONS
Current flowing through a PCB trace produces an IR voltage
drop, and with longer traces, this drop can reach several
millivolts or more, introducing a considerable error into the
output voltage of the reference. A 1 inch long, 5 mm wide trace
of 1 ounce copper has a resistance of approximately 100 mΩ at
room temperature; at a load current of 10 mA, this can
introduce a full millivolt of error. In an ideal board layout, the
reference should be mounted as close to the load as possible to
minimize the length of the output traces, and, therefore, the
error introduced by voltage drop. However, in applications
where this is not possible or convenient, force and sense
connections (sometimes referred to as Kelvin sensing
connections) are provided as a means of minimizing the IR
drop and improving accuracy.
Kelvin connections work by providing a set of high impedance
voltage-sensing lines to the output and ground nodes. Because
very little current flows through these connections, the IR drop
across their traces is negligible, and the output and ground
voltages can be sensed accurately. These voltages are fed back
into the internal amplifier and used to automatically correct for
the voltage drop across the current-carrying output and ground
lines, resulting in a highly accurate output voltage across the
load. To achieve the best performance, the sense connections
should be connected directly to the point in the load where the
output voltage should be the most accurate. See Figure 41 for an
example application.
LOAD
V
IN
0.1µF
0.1µF
1µF
08440-048
OUTPUT CAPACITOR(S) SHOULD
BE MOUNTED AS CLOSE
TO V
OUT
FORCE PIN AS POSSIBLE.
SENSE CONNECTIONS
SHOULD CONNECT AS
CLOSE TO LOAD
DEVICE AS POSSIBLE.
ADR34xx
V
IN
ENABLE
V
OUT
FORCE
V
OUT
SENSE
GND FORCE
GND SENSE
4
3
6
5
2
1
Figure 41. Application Showing Kelvin Connection
It is always advantageous to use Kelvin connections whenever
possible. However, in applications where the IR drop is negligi-
ble or an extra set of traces cannot be routed to the load, the
force and sense pins for both VOUT and GND can simply be tied
together, and the device can be used in the same fashion as a
normal 3-terminal reference (as shown in Figure 40).
VIN SLEW RATE CONSIDERATIONS
In applications with slow-rising input voltage signals, the refer-
ence exhibits overshoot or other transient anomalies that appear
on the output. These phenomena also appear during shutdown
as the internal circuitry loses power.
To avoid such conditions, ensure that the input voltage wave-
form has both a rising and falling slew rate of at least 0.1 V/ms.
SHUTDOWN/ENABLE FEATURE
The ADR34xx references can be switched to a low power shut-
down mode when a voltage of 0.7 V or lower is input to the
ENABLE pin. Likewise, the reference becomes operational for
ENABLE voltages of 0.85 × VIN or higher. During shutdown, the
supply current drops to less than 5 μA, useful in applications that
are sensitive to power consumption.
If using the shutdown feature, ensure that the ENABLE pin
voltage does not fall between 0.7 V and 0.85 × VIN because this
causes a large increase in the supply current of the device and
may keep the reference from starting up correctly (see Figure 34).
If not using the shutdown feature, however, the ENABLE pin
can simply be tied to the VIN pin, and the reference remains
operational continuously.
ADR3412/ADR3420/ADR3425/ADR3430/ADR3433/ADR3440/ADR3450
Rev. C | Page 21 of 22
SAMPLE APPLICATIONS
Negative Reference
Figure 42 shows how to connect the ADR3450 and a standard
CMOS op amp, such as the AD8663, to provide a negative
reference voltage. This configuration provides two main
advantages: first, it only requires two devices and, therefore,
does not require excessive board space; second, and more
importantly, it does not require any external resistors, meaning
that the performance of this circuit does not rely on choosing
expensive parts with low temperature coefficients to ensure
accuracy.
AD8663
0.1µF1µF
+VDD
–VDD
0.1µF
0.1µF
–5V
08440-049
ADR3450
VIN
ENABLE
VOUT FORCE
VOUT SENSE
GND FORCE
GND SENSE
4
3
6
5
2
1
Figure 42. ADR3450 Negative Reference
In this configuration, the VOUT pins of the reference sit at virtual
ground, and the negative reference voltage and load current are
taken directly from the output of the operational amplifier. Note
that in applications where the negative supply voltage is close to
the reference output voltage, a dual-supply, low offset, rail-to-
rail output amplifier must be used to ensure an accurate output
voltage. The operational amplifier must also be able to source or
sink an appropriate amount of current for the application.
Bipolar Output Reference
Figure 43 shows a bipolar reference configuration. By connecting
the output of the ADR3450 to the inverting terminal of an
operational amplifier, it is possible to obtain both positive and
negative reference voltages. R1 and R2 must be matched as
closely as possible to ensure minimal difference between the
negative and positive outputs. Resistors with low temperature
coefficients must also be used if the circuit is used in environments
with large temperature swings; otherwise, a voltage difference
develops between the two outputs as the ambient temperature
changes.
V
IN
+15V
–15V
–5V
+5V
ADA4000-1
0.1µF1µF 0.1µF
R1
10k
R2
10k
R3
5k
08440-050
ADR3450
V
IN
ENABLE
V
OUT
FORCE
V
OUT
SENSE
GND FORCE
GND SENSE
4
3
6
5
2
1
Figure 43. ADR3450 Bipolar Output Reference
Boosted Output Current Reference
Figure 44 shows a configuration for obtaining higher current
drive capability from the ADR34xx references without
sacrificing accuracy. The op amp regulates the current flow
through the MOSFET until VOUT equals the output voltage of
the reference; current is then drawn directly from VIN instead of
from the reference itself, allowing increased current drive
capability.
0.1µF
C
L
0.1µF
08440-051
2N7002
AD8663
V
IN
U6
V
OUT
+16V
0.1µF1µF
R1
100
R
L
200
ADR34xx
V
IN
ENABLE
V
OUT
FORCE
V
OUT
SENSE
GND FORCE
GND SENSE
4
3
6
5
2
1
Figure 44. Boosted Output Current Reference
Because the current-sourcing capability of this circuit depends
only on the ID rating of the MOSFET, the output drive capability
can be adjusted to the application simply by choosing an
appropriate MOSFET. In all cases, the VOUT SENSE pin should
be tied directly to the load device to maintain maximum output
voltage accuracy.
ADR3412/ADR3420/ADR3425/ADR3430/ADR3433/ADR3440/ADR3450
Rev. C | Page 22 of 22
OUTLINE DIMENSIONS
COMPLIANT TO JEDEC STANDARDS MO-178-AB
10°
SEATING
PLANE
1.90
BSC
0.95 BSC
0.60
BSC
6 5
1 2 3
4
3.00
2.90
2.80
3.00
2.80
2.60
1.70
1.60
1.50
1.30
1.15
0.90
0.15 MAX
0.05 MIN
1.45 MAX
0.95 MIN
0.20 MAX
0.08 MIN
0.50 MAX
0.30 MIN
0.55
0.45
0.35
PIN 1
INDICATOR
12-16-2008-A
Figure 45. 6-Lead Small Outline Transistor Package (SOT-23)
(RJ-6)
Dimensions shown in millimeters
ORDERING GUIDE
Model1 Output Voltage (V) Temperature Range Package Description Package Option
Ordering
Quantity
Marking
Code
ADR3412ARJZ-R2 1.200 −40°C to +125°C 6-Lead SOT-23 RJ-6 250 R2R
ADR3412ARJZ-R7 1.200 −40°C to +125°C 6-Lead SOT-23 RJ-6 3,000 R2R
ADR3420ARJZ-R2 2.048 −40°C to +125°C 6-Lead SOT-23 RJ-6 250 R2V
ADR3420ARJZ-R7 2.048 −40°C to +125°C 6-Lead SOT-23 RJ-6 3,000 R2V
ADR3425ARJZ-R2 2.500 −40°C to +125°C 6-Lead SOT-23 RJ-6 250 R2X
ADR3425ARJZ-R7 2.500 −40°C to +125°C 6-Lead SOT-23 RJ-6 3,000 R2X
ADR3430ARJZ-R2 3.000 −40°C to +125°C 6-Lead SOT-23 RJ-6 250 R2Z
ADR3430ARJZ-R7 3.000 −40°C to +125°C 6-Lead SOT-23 RJ-6 3,000 R2Z
ADR3433ARJZ-R2 3.300 −40°C to +125°C 6-Lead SOT-23 RJ-6 250 R31
ADR3433ARJZ-R7
3.300
−40°C to +125°C
6-Lead SOT-23
RJ-6
3,000
R31
ADR3440ARJZ-R2 4.096 −40°C to +125°C 6-Lead SOT-23 RJ-6 250 R33
ADR3440ARJZ-R7
4.096
−40°C to +125°C
6-Lead SOT-23
RJ-6
3,000
R33
ADR3450ARJZ-R2 5.000 −40°C to +125°C 6-Lead SOT-23 RJ-6 250 R34
ADR3450ARJZ-R7 5.000 −40°C to +125°C 6-Lead SOT-23 RJ-6 3,000 R34
1 Z = RoHS Compliant Part.
©20102018 Analog Devices, Inc. All rights reserved. Trademarks and
registered trademarks are the property of their respective owners.
D08440-0-6/18(C)

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