ADAS1000-4 Просмотр технического описания (PDF) - Analog Devices

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ADAS1000-4

Low Power, Three Electrode Electrocardiogram (ECG) Analog Front End

Analog Devices 

ADAS1000-3/ADAS1000-4

TABLE OF CONTENTS

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

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

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

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

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

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

Noise Performance ..................................................................... 10

Timing Characteristics .............................................................. 11

Absolute Maximum Ratings.......................................................... 14

Thermal Resistance .................................................................... 14

ESD Caution................................................................................ 14

Pin Configurations and Function Descriptions ......................... 15

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

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

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

ECG Inputs—Electrodes/Leads................................................ 27

ECG Channel .............................................................................. 28

Electrode/Lead Formation and Input Stage Configuration.. 29

Defibrillator Protection ............................................................. 33

ESIS Filtering............................................................................... 33

ECG Path Input Multiplexing ................................................... 33

Common-Mode Selection and Averaging .............................. 34

Wilson Central Terminal (WCT) ............................................. 35

Right Leg Drive/Reference Drive ............................................. 35

Calibration DAC......................................................................... 36

Gain Calibration ......................................................................... 36

Lead-Off Detection .................................................................... 36

Shield Driver ............................................................................... 37

Respiration (ADAS1000-4 Model Only) ................................. 37

Data Sheet

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

Pacing Artifact Detection Function (ADAS1000-4 Only).... 41

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

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

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

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

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

Pace Detection via Secondary Serial Interface ....................... 45

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

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

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

Interfacing in Gang Mode ......................................................... 50

Serial Interfaces............................................................................... 51

Standard Serial Interface ........................................................... 51

Secondary Serial Interface......................................................... 55

RESET .......................................................................................... 55

PD Function ................................................................................ 55

SPI Output Frame Structure (ECG and Status Data) ................ 56

SPI Register Definitions and Memory Map................................ 57

Control Registers Details............................................................... 58

Interface Examples ..................................................................... 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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