ADAS1000 datasheet(2/80 Pages) AD

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ADAS1000/ADAS1000-1/ADAS1000-2

Data Sheet

TABLE OF CONTENTS

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

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

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

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

Functional Block Diagram .............................................................. 4

Specifications..................................................................................... 5

Noise Performance ....................................................................... 9

Timing Characteristics .............................................................. 10

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

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

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

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

Typical Performance Characteristics ........................................... 18

Applications Information .............................................................. 25

Overview...................................................................................... 25

ECG Inputs—Electrodes/Leads................................................ 28

ECG Channel .............................................................................. 29

Electrode/Lead Formation and Input Stage Configuration.. 30

Defibrillator Protection ............................................................. 34

ESIS Filtering............................................................................... 34

ECG Path Input Multiplexing................................................... 34

Common-Mode Selection and Averaging .............................. 35

Wilson Central Terminal (WCT)............................................. 36

Right Leg Drive/Reference Drive ............................................. 36

Calibration DAC......................................................................... 37

Gain Calibration ......................................................................... 37

Lead-Off Detection .................................................................... 37

Shield Driver ............................................................................... 38

Respiration (ADAS1000 Model Only)..................................... 38

Evaluating Respiration Performance ....................................... 41

Extend Switch On Respiration Paths ....................................... 41

Pacing Artifact Detection Function (ADAS1000 Only) ....... 42

Biventricular Pacers ................................................................... 45

Pace Detection Measurements ................................................. 45

Evaluating Pace Detection Performance................................. 45

Pace Width .................................................................................. 45

Pace Latency................................................................................ 45

Pace Detection via Secondary Serial Interface (ADAS1000

and ADAS1000-1 Only) ............................................................ 45

Filtering ....................................................................................... 46

Voltage Reference ....................................................................... 47

Gang Mode Operation............................................................... 47

Interfacing in Gang Mode......................................................... 49

Serial Interfaces............................................................................... 50

Standard Serial Interface ........................................................... 50

Secondary Serial Interface......................................................... 54

RESET .......................................................................................... 54

PD Function................................................................................ 54

SPI Output Frame Structure (ECG and Status Data) ................ 55

SPI Register Definitions and Memory Map................................ 56

Control Registers Details............................................................... 57

Examples of Interfacing to the ADAS1000 ............................. 74

Software Flowchart .................................................................... 77

Power Supply, Grounding, and Decoupling Strategy ............ 78

AVDD .......................................................................................... 78

ADCVDD and DVDD Supplies............................................... 78

Unused Pins/Paths ..................................................................... 78

Layout Recommendations ........................................................ 78

Outline Dimensions....................................................................... 79

Ordering Guide .......................................................................... 80

Rev. B | Page 2 of 80

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