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DATA SHEET
AFE4432 Ultra-Small, Integrated AFE for Optical Bio-Sensing
1 Features
- Supports signal acquisition of up to 12 phase sets
- Supports up to 4 LEDs, 3 PDs
- Flexible allocation of LEDs, PDs in each phase
- Simultaneous signal acquisition from different sensors at
different data rates
- Accurate, continuous PPG monitoring:
- Low current for continuous heart-rate monitoring
on a wearable device with a typical value: 12 μA for the receiver
- Peak system SNR of 115 dB in 0.5-10 Hz band
enables high-accuracy SpO2 measurement
- Transmitter:
- 8-Bit Programmable LED
current with range adjustable from 25 mA to 250 mA
- Mode to fire two LEDs in parallel with independent per-phase current
control
- Programmable LED on-time
per-phase
- Simultaneous support of 4 LEDs for SpO2,
Multi-Wavelength HRM
- Receiver:
- Supports 3 Time-Multiplexed PD Inputs
- 2 parallel receivers (2 sets of TIA/filter)
- Individual ambient offset
subtraction DAC at each TIA Input with 8-bit per-phase control and range
adjustable up to 255-µA
- Individual LED offset
subtraction DAC at each TIA input with 9-bit per-phase control and 64-µA
range
- Digital ambient
subtraction at ADC output
- Noise filtering with programmable bandwidth
- Transimpedance gain: 3.7
kΩ to 1 MΩ
- Supports external clock or internal oscillator
- Option to acquire data synchronized with a system clock
- Automatic cancellation of DC from Ambient, LED
- FIFO with 160-sample depth
- SPI™ interface/ I2C interface
- 1.9-mm × 1.8-mm DSBGA, 0.35-mm Pitch
- Supplies: Rx:1.7 - 1.9 V, Tx: 3-5.5 V
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