Fully Integrated Photometric System with Ambient Light Rejection Data Sheet ADPD142RG/ADPD142RI FEATURES GENERAL DESCRIPTION 2.8 mm 5 mm module with integrated optical components The ADPD142RG/ADPD142RI are complete photometric systems Red and infrared (IR) LEDs (ADPD142RI) designed to stimulate LEDs and measure the corresponding Red and green LEDs (ADPD142RG) optical return signals. These systems feature best-in-class Photodiode rejection of ambient light interference, both dc and ac. Each True dual channel 250 mA LED driver module contains a highly efficient photometric front end, two Separate LED and AFE settings for each channel LEDs, and a photodiode. The front end consists of a control Dual data registers for each LED return signal block, a 14-bit analog-to-digital converter (ADC) with 20-bit 14-bit ADC burst accumulator and two flexible, independently configurable 20-bit burst accumulator enabling 20 bits per sample period LED drivers. The analog front end (AFE) handles return data On-board sample to sample accumulator enabling up to from each LED on separate data paths, and with the option of 27 bits per data read separate AFE settings. The data output and functional con- 2 figuration occur over a 1.8 V I C interface. The control circuitry APPLICATIONS includes flexible LED signaling and synchronous detection. Optical heart rate monitoring (HRM) Reflective SpO2 measurement FUNCTIONAL BLOCK DIAGRAM AVDD DVDD ADPD142RG/ADPD142RI AGND ANALOG BLOCK VREF 1F PHOTODIODE TIME SLOT A DATA AMBIENT AFE 14-BIT TIA LIGHT SDA GAIN ADC REJECTION SCL TIME SLOT B AFE CONFIGURATION, V BIAS DATA INT TIME SLOT A DGND AFE CONFIGURATION, VLED TIME SLOT B AFE: SIGNAL CONDITIONING LED2 LED1 DIGITAL INTERFACE AND CONTROL LED1/NC LED1 DRIVER LED1 LEVEL AND TIMING CONTROL LED2/NC LED2 DRIVER LED2 LEVEL AND TIMING CONTROL LGND Figure 1. For more information about the ADPD142RG/ADPD142RI, contact Analog Devices, Inc., at optical sensors analog.com. Rev. SpB Document Feedback Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. rights of third parties that may result from its use. Specifications subject to change without notice. Tel: 781.329.4700 2014-2016 Analog Devices, Inc. All rights reserved. No license is granted by implication or otherwise under any patent or patent rights of Analog Technical Support www.analog.com Devices. Trademarks and registered trademarks are the property of their respective owners. 12166-002ADPD142RG/ADPD142RI Data Sheet NOTES 2014-2016 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D12166F-0-3/16(SpB) Rev. SpB Page 2 of 2