RT1025 Integrated AFE Solution

Richtek's integrated AFE solution is designed for heart-rate monitoring and measurements

Image of Richtek RT1025 Integrated AFE SolutionRichtek's RT1025 is an integrated AFE solution for heart-rate monitoring and measurements. The RT1025 integrates low noise voltage and current sensing channels and is capable of sensing ECG (electrocardiography) and PPG (photoplethysmography) simultaneously. The RT1025 have >100 dB dynamic range and can sense pulses accurately by detecting the heart’s electric signals. The sampling rates of the high-precision voltage and current sensing channels in the RT1025 are configurable between 64 kHz to 4 kHz. The RT1025 solution needs only a few discrete components and is easy to use for low-power medical ECG/PPG, sports, and fitness applications. With high levels of integration and high-precision voltage and current sensing channels, the RT1025 solution is suitable for scalable medical instrumentation systems. The RT1025 is available in a 3.1 mm x 3.4 mm, 41-ball, 0.4 mm pitch, WL-CSP package.

The daughter board (DTB) was developed to bring out all the RT1025 pins to DIP pins. The daughter board includes the RT1025 together with the required 32 kHz Xtal and the passive components to quickly evaluate the operation and performance of the RT1025. The detailed schematic, hardware, and bench measure procedure are described in the datasheet. The daughter board number is PCB107_V1, and the dimensions are 3.3 cm x 3.3 cm.

Features
  • ECG channel features
    • Supports two-electrode (2E) mode and right leg drive (RLD) mode
    • Low noise PGA and high-resolution ADC
    • Input impedance: 125 M to 500 MΩ at two-electrode mode and >1 GΩ at right leg drive mode
    • Low input-referred noise: 0.67 µVRMS (64 Hz ODR, gain = 12)
    • Dynamic range: 110 dB at gain = 6
    • CMRR > 85 dB at 60 Hz
    • Data rate: 64 SPS to 4k SPS
  • Other features
    • 2-in-1 bio-sensing AFE (voltage/current)
    • Built-in heartbeat interval estimation
    • Integrates an oscillator to offer high-precision clock with external crystal
    • Support I²C and SPI I/F for MCU
    • On-chip SRAM for data buffering
    • Ultra-low power consumption
    • Operating temperature range: -20°C to +65°C
    • Small 3.1 mm x 3.4 mm, 41-ball, 0.4 mm pitch, and WL-CSP package
    • RoHS compliant and halogen-free
  • Daughter board features
    • Evaluation board number: PCB107_V1
    • Dimension: 3.3 cm x 3.3 cm
    • 32 DIP pins
  • PPG channel features
    • Flexible timing control and support dynamic power down
    • TX supports H-bridge and push/pull mode
    • TX LED current range: 10 mA/25 mA/35 mA/50 mA/65 mA/75 mA/90 mA/105 mA, each with 8-bit current resolution
    • Input maximum current range: 0.5 µA to 50 µA
    • Input maximum capacitance: 1 nF
    • Input-referred noise: 50 pARMS at 5 µA input current
    • CMRR >80 dB at 60 Hz
    • PGA gain: 1 V/V to 6 V/V
    • Ambient DAC1/DAC2 range: 1 µA to 6 µA

RT1025 Integrated AFE Solution

ImageManufacturer Part NumberDescriptionAvailable QuantityView Details
IC ECG/PPG 2-IN-1 AFE, 41WLCSPRT1025WSIC ECG/PPG 2-IN-1 AFE, 41WLCSP1477 - ImmediateView Details
EVAL MODULE FOR RT1025WSEVB_RT1025WS_D0EVAL MODULE FOR RT1025WS2 - ImmediateView Details
Published: 2018-10-30