PPG signal chain

• 4 independent PPG channels with simultaneous sampling to allow less LED on-time

• Support 4 differential or 8 single-ended PD inputs multiplexing to PPG channels

• 4 high-resolution 24-bit ADCs for simultaneous conversion

• Ultra low dark current noise of ＜14 pArms

• 4 LED drivers support up to 16 LEDs, 200 mA peak drive current for each driver

• High system SNR of ＞110 dB to ensure accurate PPG monitoring

• Up to 128 samples per cycle, over 80 dB ambient light rejection ratio

Impedance measurement signal chains

• Programmable BIA TX built-in current excitation source with frequency up to 1 MHz

• Ultra-low noise INA with high pass filter

• 4-electrode impedance measurement for portable BIA and support contact impedance measurement

• Built-in Analog I/Q demodulator provide complex (I, Q) impedance data

• EDA channel reuse DC mode /AC mode ECG channel with additional current excitation source (EDA TX) of low frequency excitation

• Support digital I/Q demodulation for complex (I, Q) impedance data extraction

• Support on-chip CORDIC

Build-in functions

• Automatic LED dimming and AGC (automatic gain control)

• Active shielding driver

Support SPI and IIC communications

Package

• WLCSP 49 balls,0.35 mm pitch

• 2.645 mm * 2.645 mm * 0.5 mm

Internal FIFO

• Area 1: 16 k bytes (3200 samples)

• Area 2: 80 k bytes (16k samples)

Typical Applications

• Consumer electronics: wearable devices