ADPD144RI Integrated Optical Module with Ambient Light Rejection and Two LEDs

The ADPD144RI 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 a 4-channel photodiode (PD). All of these components 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 14-bit analog-to-digital converter (ADC) with a 20-bit burst accumulator, and two flexible, independently configurable LED drivers. The control circuitry includes flexible LED signaling and synchronous detection. The analog front end (AFE) processes data on two separate data paths in parallel, with the option of separate AFE settings. The data output and functional configuration occur over a 1.8 V I2C interface.

Applications

Optical heart rate monitoring
Reflective SpO2 measurement

Features and Benefits

2.8 mm × 5.0 mm module with integrated optical components

One 660 nm LED1, one 880 nm LED2, one 4-channel photodiode

One 660 nm LED1, one 880 nm LED2, one 4-channel photodiode

True 2-channel, 370 mA LED driver

Specifically designed for ultralow direct optical reflections

Separate LED and AFE settings for each channel

Dual data registers for each LED return signal

14-bit ADC

20-bit burst accumulator enabling 20 bits per sample period

On-board sample to sample accumulator enabling up to 27 bits per data read

Custom optical package made to work under a glass window

Optical

Optical Sensors

Data Sheets

Document	note
ADPD144RI: Integrated Optical Module with Ambient Light Rejection and Two LEDs (Rev. Sp0)	PDF 85.43 K

Order Information

Part Number	Package	Packing Qty	Temp Range	Price 100-499	Price 1000+	RoHS
ADPD105BCBZR7 Production	CHIPS W/SOLDER BUMPS/WLCSP	REEL 3000	-40 to 85C	0	2.51	Y

Evaluation Boards

Part Number	Description	Price	RoHS
EVAL-ADPD105Z-GEN	ADPD105 Generic Evaluation board	135	Y

ADPD144RI: Integrated Optical Module with Ambient Light Rejection and Two LEDs (Rev. Sp0) adpd144ri