Datasheet

ADPD1080/ADPD1081 Data Sheet
Rev. B | 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
I
2
C 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 C
VLED
..................................................................... 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
Register Listing ............................................................................... 54
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
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