HX3695 is an ultra-low power integrated AFE for Wearable, Optical, Heart-Rate Monitor and Bio sensor with I2C/SPI interface. HX3695 include transmitter and receiver two parts. The receiver have four PPG input channels ,±172uA offset IDAC and a high resolution ADC. The transmitter has eight fully integrated LED drivers with 8-bit current control. The device has a high dynamic range transmit and receive circuitry that helps with the sensing of very small signal.
1.Ultra-low power ,4 PD input, 8 LED drives Biological sign monitoring analog AFE.
2.The dynamic range of the optical signal path is up to 110dB, which can accurately process small signals.
3.Support 8-phase data conversion each time, each phase PD input is dynamically selectable, and LED emission is dynamically selectable.
4.Ultra-low power : @FS=25Hz，LED(32uS)25mA:LED20uA,Receiver 25uA.
5.Transmitter: 8 LED drivers (internal 2 independent LED driver cores), supporting a maximum 200mA 8-bit programmable LED drive current; When the configurable LED is lit Receiving Support 2-way or multiplex PD input, built-in accuracy ADC 8uA. 8BITS configurable ALS elimination IDAC± 64uA, 8bits configurable DC elimination IDAC each phase.
6.FIFO depth is 256 PPG data, which is applicable to the algorithm scheme of power consumption optimization.
1.Voltage: TX_SUP =3.3 V~5.25V VDDA =2.7 V~3.6 V IO_SUP = 1.8 V~VDDA
2.Communication interface: IIC/SPI
3.Temperature range: -20℃~85℃
4.Superiority: Ultra High Performance，High end dynamic HRM ,SPO2 and HRV
5.Compact Size: Package1：WLCSP25 2.1*2.1*0.5mm