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ADAS1000
(Rev.:RevA)

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

Analog Devices 

ADAS1000/ADAS1000-1/ADAS1000-2

TABLE OF CONTENTS

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

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

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

Revision History ............................................................................... 2

Functional Block Diagram .............................................................. 3

Specifications..................................................................................... 4

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 ............................................................. 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 ............................................................................... 36

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

Evaluating Respiration Performance ....................................... 39

Data Sheet

Extend Switch On Respiration Paths ....................................... 39

Pacing Artifact Detection Function (ADAS1000 Only) ....... 40

Biventricular Pacers ................................................................... 42

Pace Detection Measurements ................................................. 42

Evaluating Pace Detection Performance ................................. 43

Pace Latency................................................................................ 43

Pace Detection via Secondary Serial Interface (ADAS1000

and ADAS1000-1 Only) ............................................................ 43

Filtering ....................................................................................... 43

Voltage Reference ....................................................................... 45

Gang Mode Operation............................................................... 45

Interfacing in Gang Mode ......................................................... 47

Serial Interfaces............................................................................... 48

Standard Serial Interface ........................................................... 48

Secondary Serial Interface......................................................... 52

RESET .......................................................................................... 52

PD Function ................................................................................ 52

SPI Output Frame Structure (ECG and Status Data) ................ 53

SPI Register Definitions and Memory Map................................ 54

Control Registers Details............................................................... 55

Examples of Interfacing to the ADAS1000 ............................. 72

Software Flowchart .................................................................... 75

Power Supply, Grounding, and Decoupling Strategy ............ 76

AVDD .......................................................................................... 76

ADCVDD and DVDD Supplies ............................................... 76

Unused Pins/Paths ..................................................................... 76

Layout Recommendations ........................................................ 76

Outline Dimensions ....................................................................... 77

Ordering Guide .......................................................................... 78

REVISION HISTORY

1/13—Rev. 0 to Rev. A

Changes to Features Section............................................................ 1

Changes to Table 1............................................................................ 3

Changes to Excitation Current, Test Conditions/Comments,

Table 2 ................................................................................................ 5

Added Table 3; Renumbered Sequentially .................................... 9

Changes to Respiration (ADAS1000 Model Only) Section,

Figure 66, and Internal Respiration Capacitors Section............ 37

Changes to Figure 67...................................................................... 38

Changes to Figure 68...................................................................... 39

Added Evaluating Pace Detection Performance Section .......... 43

Added Table 15 ............................................................................... 47

Changes to Clocks Section ............................................................ 51

Changes to RESPAMP Name, Function, Table 28 ..................... 57

Changes to Bits[14:9], Function, Table 30 .................................. 59

Changes to Ordering Guide .......................................................... 78

8/12—Revision 0: Initial Version

Rev. A | Page 2 of 80

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