ADPD188GG-ACEZR7

ADPD188GG is a complete photometric system designed to measure optical signals from ambient light and from synchronous reflected light emitting diode (LED) pulses. Synchronous measurement offers best-in-class rejection of ambient light interference, both dc and ac. The module integrates a highly efficient photometric front end, two LEDs, and two photodiode (PD). All of these items are housed in a custom package that prevents light from going directly from the LED to the photodiode without first entering the subject. The front end of the application specific integrated circuit (ASIC) consists of a control block, a 14bit analogue-to-digital converter (ADC) with a 20bit burst accumulator, and three flexible, independently configurable LED drivers. The control circuitry includes flexible LED signalling and synchronous detection. It is used in application such as optical heart rate monitoring, reflective PPG measurement, CNIBP measurement etc.

• 2 green LEDs, 2 PDs with IR cut filter, 2 external sensor inputs
• 20bit burst accumulator enabling 20bits per sample period
• On-board sample to sample accumulator enabling upto 27bits per data read
• Custom optical package made to work under a glass window
• Optimized SNR for signal limited cases, I²C or SPI communications
• LED peak current setting is 12mA to 370mA
• Peak VDD supply current is 4.5mA typ at (single-channel, register 0x3C, bits[8:3] = 0x38)
• Supply voltage is 1.8V typ at (applied at the VDD1 and VDD2 pins)
• Operating temperature is -40°C to +85°C
• Package style is 24-terminal chip array small outline no lead cavity [LGA-CAV]

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