Description

Multimodal Sensor Front End Features: Multimodal analog front end 4 input channels with multiple operation modes to accommodate the following measurements: PPG, ECG, EDA, impedance, and temperature Dual-channel processing with simultaneous sampling 12 programmable time slots for synchronized sensor measurements Flexible input multiplexing to support differential and single-ended sensor measurements 4 LED drivers, which can be driven simultaneously Flexible sampling rate from 0.004 Hz to 9 kHz using internal oscillators On-chip digital filtering SNR: 105 dB (100 kΩ TIA gain, 100 Hz ODR, 80 pulses, CPD = 70 pF, 0.5 Hz to 10 Hz bandwidth) AC ambient light rejection: 60 dB up to 1 kHz 400 mA total LED peak drive current Total system power dissipation: 30 μW (combined LED and AFE power), continuous PPG measurement at 75 dB SNR, 25 Hz ODR, 100 nA/mA CTR SPI communications supported 512-byte FIFO size