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PDF ADPD144RI Data sheet ( Hoja de datos )
| Número de pieza | ADPD144RI | |
| Descripción | Integrated Optical Module | |
| Fabricantes | Analog Devices | |
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Data Sheet
Integrated Optical Module with Ambient
Light Rejection and Two LEDs
ADPD144RI
FEATURES
GENERAL DESCRIPTION
2.8 mm × 5.0 mm module with integrated optical components
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
APPLICATIONS
Optical heart rate monitoring
Reflective SpO2 measurement
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, inde-
pendently 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.
FUNCTIONAL BLOCK DIAGRAM
VDD1
VDD2
ADPD144RI
PD3
PD1
PD4 PD2
ANALOG BLOCK
CH1
TIA
VBIAS
AMBIENT
LIGHT
REJECTION
AFE
GAIN
VLED
LEDs
880nm
660nm
LED2/DNC
LED1/DNC
CH2
TIA
VBIAS
AMBIENT
LIGHT
REJECTION
AFE
GAIN
CH3
TIA
VBIAS
AMBIENT
LIGHT
REJECTION
AFE
GAIN
CH4
TIA
AMBIENT
LIGHT
REJECTION
AFE
GAIN
VBIAS
AFE: SIGNAL CONDITIONING
14-BIT
ADC
AFE CONFIGURATION,
TIME SLOT A
AFE CONFIGURATION,
TIME SLOT B
LED2 DRIVER
LED1 DRIVER
LED2 LEVEL AND TIMING CONTROL
LED1 LEVEL AND TIMING CONTROL
TIME SLOT A
DATA
TIME SLOT B
DATA
DIGITAL
INTERFACE
AND
CONTROL
AGND
VREF
1µF
SDA
SCL
INT
DGND
LGND
NOTES
1. DNC = DO NOT CONNECT TO THIS PIN UNLESS DRIVING EXTERNAL LEDs.
Figure 1.
Rev. Sp0
Document Feedback
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibilityisassumedbyAnalogDevices for itsuse,nor foranyinfringementsofpatentsor other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
©2016 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com
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