Datasheet > ADPD144RI-ACEZ-RL7

ADPD144RI-ACEZ-RL7

更新时间： 2024-02-02 23:58:33

品牌	Logo	应用领域
亚德诺 - ADI		/
页数	文件大小	规格书
34页	691K
描述
PPG Optical Sensor Module with Integrated Red/IR Emitters and AFE

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PPG Optical Sensor Module with Integrated

Red/IR Emitters and AFE

Data Sheet

ADPD144RI

FEATURES

GENERAL DESCRIPTION

2.8 mm × 5.0 mm module with integrated optical components

660 nm LED, 880 nm IR LED, and photodiode

Fully integrated AFE, ADC, LED drivers, and timing core

Custom optical package for use under a glass window

Programmable 2-channel, 8.5 mA to 370 mA LED drivers

Provision to use external LED emitters

The ADPD144RI is a highly integrated, photometric front end

optimized for photoplethysmography (PPG) detection of blood

oxygenation (SpO2) by synchronous detection in red and infrared

wavelengths. Synchronous measurement allows rejection of both

dc and ac ambient light interference with extremely low power

consumption.

Low power

The module combines highly efficient, light emitting diode

(LED) emitters and a sensitive 4-channel, deep diffusion

photodiode (PD1 to PD4) with a custom application specific

integrated circuit (ASIC) in a compact package that provides

optical isolation between the integrated LED emitters and the

detection photodiodes to improve through tissue, signal-to-

noise ratio (SNR).

Specifically designed for ultralow direct optical reflections

Independent AFE settings per channel

I²C data and control interface

Burst accumulator enabling 20 bits per sample period

Sample to sample accumulator enabling up to 27 bits per

data read

16-bit or 32-bit register or FIFO readout per channel

The ASIC consists of a 4-channel analog front end (AFE) with

two independently configurable datapaths with separate gain

and filter settings, a 14-bit analog-to-digital converter (ADC)

with a burst accumulator, two flexible, independently configurable,

LED drivers, and a digital control block. The digital control

block provides AFE and LED timing, signal processing, and

communication. Data output and functional configuration

occur over a 1.8 V I²C interface.

APPLICATIONS

Optical heart rate monitoring

Reflective SpO2 measurement

FUNCTIONAL BLOCK DIAGRAM

VDD1

VDD2

ADPD144RI

ANALOG BLOCK

PD3

PD1

CH1

AMBIENT

LIGHT

AFE

GAIN

TIA

REJECTION

PD4

PD2

BIAS

CH2

AMBIENT

LIGHT

REJECTION

AFE

GAIN

AGND

VREF

BIAS

CH3

1µF

AMBIENT

LIGHT

VLED

TIME SLOT A

DATA

AFE

TIA

LEDs

GAIN

REJECTION

880nm

BIAS

14-BIT

ADC

SDA

SCL

CH4

TIME SLOT B

DATA

AMBIENT

LIGHT

REJECTION

AFE

GAIN

AFE CONFIGURATION,

TIME SLOT A

INT

660nm

AFE CONFIGURATION,

TIME SLOT B

DGND

BIAS

AFE: SIGNAL CONDITIONING

DIGITAL

INTERFACE

AND

CONTROL

LED2 DRIVER

LED1 DRIVER

LEDX2

LEDX1

LED2 LEVEL AND TIMING CONTROL

LED1 LEVEL AND TIMING CONTROL

LGND

Figure 1.

Rev. A

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

rightsof third parties that may result fromits use. Specifications subject to change without notice. No

license is granted by implication or otherwise under any patent or patent rights of Analog Devices.

Trademarks andregisteredtrademarks are the property of their respective owners.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 781.329.4700

Technical Support

www.analog.com

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