ADPD1081 datasheet(2/74 Pages) AD

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ADPD1080/ADPD1081

Data Sheet

Rev. C | Page 2 of 74

TABLE OF CONTENTS

Features.............................................................................................. 1

Applications ...................................................................................... 1

General Description......................................................................... 1

Table of Contents ............................................................................. 2

Revision History ............................................................................... 3

Functional Block Diagrams............................................................. 4

Specifications .................................................................................... 6

Temperature and Power Specifications .................................... 6

Performance Specifications......................................................... 7

Analog Specifications................................................................... 8

Digital Specifications ................................................................. 10

Timing Specifications ................................................................ 11

Absolute Maximum Ratings ......................................................... 13

Thermal Resistance .................................................................... 13

Recommended Soldering Profile ............................................. 13

ESD Caution................................................................................ 13

Pin Configurations and Function Descriptions......................... 14

Typical Performance Characteristics........................................... 17

Theory of Operation ...................................................................... 19

Introduction................................................................................ 19

Dual Time Slot Operation......................................................... 19

Time Slot Switch......................................................................... 20

Adjustable Sampling Frequency............................................... 23

State Machine Operation .......................................................... 24

Normal Mode Operation and Data Flow................................ 24

AFE Operation............................................................................ 26

AFE Integration Offset Adjustment ........................................ 26

I2C Serial Interface...................................................................... 28

SPI Port........................................................................................ 29

Applications Information.............................................................. 31

Typical Connection Diagram ................................................... 31

LED Driver Pins and LED Supply Voltage............................. 32

LED Driver Operation............................................................... 32

Determining the Average Current........................................... 33

Determining CVLED ..................................................................... 33

LED Inductance Considerations.............................................. 34

Recommended Start-Up Sequence.......................................... 34

Reading Data............................................................................... 34

Clocks and Timing Calibration................................................ 36

Optional Timing Signals Available on GPIO0 and GPIO1 . 36

Calculating Current Consumption.......................................... 38

Optimizing SNR per Watt ........................................................ 39

Optimizing Power by Disabling Unused Channels and

Amplifiers.................................................................................... 41

Optimizing Dynamic Range for High Ambient Light

Conditions................................................................................... 42

TIA ADC Mode.......................................................................... 43

Pulse Connect Mode.................................................................. 46

Synchronous ECG and PPG Measurement Using TIA ADC

Mode ............................................................................................ 46

Float Mode .................................................................................. 47

LED Control Registers............................................................... 58

AFE Configuration Registers.................................................... 60

Float Mode Registers ................................................................. 64

System Registers......................................................................... 66

ADC Registers ............................................................................ 71

Data Registers ............................................................................. 72

Required Start-Up Load Procedure......................................... 72

Outline Dimensions....................................................................... 73

Ordering Guide .......................................................................... 74

Automotive Products ................................................................ 74

ADPD1081 Datasheet(PDF) 2 Page - Analog Devices

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