Photometric System. ADPD142RI Datasheet

ADPD142RI System. Datasheet pdf. Equivalent

ADPD142RI Datasheet
Recommendation ADPD142RI Datasheet
Part ADPD142RI
Description Fully Integrated Photometric System
Feature ADPD142RI; Data Sheet Fully Integrated Photometric System with Ambient Light Rejection ADPD142RG/ADPD142RI FE.
Manufacture Analog Devices
Datasheet
Download ADPD142RI Datasheet




Analog Devices ADPD142RI
Data Sheet
Fully Integrated Photometric System
with Ambient Light Rejection
ADPD142RG/ADPD142RI
FEATURES
2.8 mm × 5 mm module with integrated optical components
Red and infrared (IR) LEDs (ADPD142RI)
Red and green LEDs (ADPD142RG)
Photodiode
True dual channel 250 mA LED driver
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
APPLICATIONS
Optical heart rate monitoring (HRM)
Reflective SpO2 measurement
GENERAL DESCRIPTION
The ADPD142RG/ADPD142RI are complete photometric systems
designed to stimulate LEDs and measure the corresponding
optical return signals. These systems feature best-in-class
rejection of ambient light interference, both dc and ac. Each
module contains a highly efficient photometric front end, two
LEDs, and a photodiode. The front end consists of a control
block, a 14-bit analog-to-digital converter (ADC) with 20-bit
burst accumulator and two flexible, independently configurable
LED drivers. The analog front end (AFE) handles return data
from each LED on separate data paths, and with the option of
separate AFE settings. The data output and functional con-
figuration occur over a 1.8 V I2C interface. The control circuitry
includes flexible LED signaling and synchronous detection.
ADPD142RG/ADPD142RI
FUNCTIONAL BLOCK DIAGRAM
AVDD
DVDD
ANALOG BLOCK
PHOTODIODE
VLED
LED2
LED1
LED1/NC
LED2/NC
TIA
VBIAS
AMBIENT
LIGHT
REJECTION
AFE
GAIN
AFE: SIGNAL CONDITIONING
14-BIT
ADC
AFE CONFIGURATION,
TIME SLOT A
AFE CONFIGURATION,
TIME SLOT B
TIME SLOT A
DATA
TIME SLOT B
DATA
DIGITAL
INTERFACE
AND
CONTROL
LED1 DRIVER
LED2 DRIVER
LED1 LEVEL AND TIMING CONTROL
LED2 LEVEL AND TIMING CONTROL
LGND
Figure 1.
AGND
VREF
1µF
SDA
SCL
INT
DGND
For more information about the ADPD142RG/ADPD142RI, contact Analog Devices, Inc., at optical_sensors@analog.com.
Rev. SpB
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One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700 ©2014-2016 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com



Analog Devices ADPD142RI
ADPD142RG/ADPD142RI
NOTES
Data Sheet
©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







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