ADPD105BCPZ datasheet(2/66 Pages) AD

2 / 66 page

ADPD105/ADPD106/ADPD107

Data Sheet

Rev. A | Page 2 of 66

TABLE OF CONTENTS

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

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

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

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

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

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

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

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

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

Digital Specifications ................................................................... 9

Timing Specifications ................................................................ 10

Absolute Maximum Ratings.......................................................... 12

Thermal Resistance .................................................................... 12

Recommended Soldering Profile ............................................. 12

ESD Caution................................................................................ 12

Pin Configurations and Function Descriptions ......................... 13

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

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

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

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

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

Adjustable Sampling Frequency ............................................... 22

State Machine Operation........................................................... 23

Normal Mode Operation and Data Flow ................................ 23

AFE Operation............................................................................ 25

AFE Integration Offset Adjustment......................................... 25

I2C Serial Interface...................................................................... 27

SPI Port ........................................................................................ 28

Typical Connection Diagram ................................................... 30

LED Driver Pins and LED Supply Voltage.............................. 31

LED Driver Operation............................................................... 31

Determining the Average Current ........................................... 31

Determining CVLED ..................................................................... 32

LED Inductance Considerations .............................................. 32

Recommended Start-Up Sequence .......................................... 33

Reading Data............................................................................... 33

Clocks and Timing Calibration ................................................ 34

Optional Timing Signals Available on GPIO0 and GPIO1 .. 35

Calculating Current Consumption .......................................... 37

Optimizing SNR per Watt ......................................................... 38

Optimizing Power by Disabling Unused Channels and

Amplifiers.................................................................................... 39

TIA ADC Mode.......................................................................... 40

Digital Integrate Mode............................................................... 42

Pulse Connect Mode.................................................................. 45

Synchronous ECG and PPG Measurement Using TIA ADC

Mode ............................................................................................ 45

LED Control Registers............................................................... 52

AFE Global Configuration Registers....................................... 54

System Registers ......................................................................... 59

ADC Registers ............................................................................ 63

Data Registers ............................................................................. 64

Required Start-Up Load Procedure ......................................... 64

Outline Dimensions ....................................................................... 65

Ordering Guide .......................................................................... 66

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