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PDF ADPD174GGI Data sheet ( Hoja de datos )
| Número de pieza | ADPD174GGI | |
| Descripción | Integrated Optical Module | |
| Fabricantes | Analog Devices | |
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Data Sheet
Integrated Optical Module with Ambient
Light Rejection and Three LEDs
ADPD174GGI
FEATURES
2.8 mm × 6.5 mm module with integrated optical components
2 green LEDs located on either side of the photodiode,
1 infrared LED, and 1 photodiode
True 3-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
Custom optical package made to work under a glass window
Optimized SNR for signal limited cases
APPLICATIONS
Optical heart rate monitoring
Reflective SpO2 measurement
GENERAL DESCRIPTION
The ADPD174GGI is a complete photometric system designed to
measure optical signals from ambient light and from synchronous
reflected 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, three
LEDs, and a 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 ASIC consists of a control block, a 14-bit
analog-to-digital converter (ADC) with a 20-bit burst accumula-
tor, and three flexible, independently configurable LED drivers.
The control circuitry includes flexible LED signaling and synchro-
nous detection. The analog front end (AFE) features best-in-class
rejection of signal offset and corruption due to modulated
interference commonly caused by ambient light. The data
output and functional configuration occur over a 1.8 V I2C
interface.
ADPD174GGI
PHOTODIODE
FUNCTIONAL BLOCK DIAGRAM
VDD1
ANALOG BLOCK
VDD2
VLED2
VLED1
LEDs
IR
GREEN
LED3/DNC
LED2
LED1/DNC
CH. 1
TIA
VBIAS
AMBIENT
LIGHT
REJECTION
AFE
GAIN
AFE: SIGNAL CONDITIONING
14-BIT
ADC
AFE CONFI GUR ATI ON,
TIME SLOT A
AFE CONFI GUR ATI ON,
TIME SLOT B
LED3 DRIVER
LED2 DRIVER
LED1 DRIVER
LED3 LEVEL AND TIMING CONTROL
LED2 LEVEL AND TIMING CONTROL
LED1 LEVEL AND TIMING CONTROL
TIME SLOT A
DATA
TIME SLOT B
DATA
DIGITAL
INTERFACE
AND
CONTROL
LGND
NOTES
1. DNC = DO NOT CONNECT. DO NOT CONNECT TO THIS PIN WHEN USING INTERNAL LEDs.
Figure 1.
AGND
VREF
1µF
SDA
SCL
INT
DGND
Rev. SpA
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
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
©2015 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com
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