Datasheet

ADAS1000-3/ADAS1000-4 Data Sheet
Rev. A | Page 2 of 76
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 ........................................... 17
Applications Information .............................................................. 24
Overview ...................................................................................... 24
ECG Inputs—Electrodes/Leads ................................................ 26
ECG Channel .............................................................................. 27
Electrode/Lead Formation and Input Stage Configuration .. 28
Defibrillator Protection ............................................................. 30
ESIS Filtering ............................................................................... 30
ECG Path Input Multiplexing ................................................... 30
Common-Mode Selection and Averaging .............................. 31
Wilson Central Terminal (WCT) ............................................. 32
Right Leg Drive/Reference Drive ............................................. 32
Calibration DAC ......................................................................... 33
Gain Calibration ......................................................................... 33
Lead-Off Detection .................................................................... 33
Shield Driver ............................................................................... 33
Respiration (ADAS1000-4 Model Only) ................................. 34
Evaluating Respiration Performance ....................................... 36
Pacing Artifact Detection Function (ADAS1000-4 Only) ... 36
Biventricular Pacers ................................................................... 39
Pace Detection Measurements ................................................. 39
Evaluating Pace Detection Performance ................................. 40
Pace Latency ................................................................................ 40
Pace Detection via Secondary Serial Interface ....................... 40
Filtering ....................................................................................... 40
Voltage Reference ....................................................................... 42
Gang Mode Operation ............................................................... 42
Interfacing in Gang Mode ......................................................... 45
Serial Interfaces ............................................................................... 46
Standard Serial Interface ........................................................... 46
Secondary Serial Interface ......................................................... 50
RESET
.......................................................................................... 50
PD
Function ................................................................................ 50
SPI Output Frame Structure (ECG and Status Data) ................ 51
SPI Register Definitions and Memory Map ................................ 52
Control Registers Details ............................................................... 53
Interface Examples ..................................................................... 69
Software Flowchart .................................................................... 72
Power Supply, Grounding, and Decoupling Strategy ............ 73
AVDD .......................................................................................... 73
ADCVDD and DVDD Supplies ............................................... 73
Unused Pins/Paths ..................................................................... 73
Layout Recommendations ........................................................ 73
Outline Dimensions ....................................................................... 74
Ordering Guide .......................................................................... 75
REVISION HISTORY
1/13—Rev. 0 to Rev. A
Changes to Endnote 2, Table 1 ........................................................ 3
Changes to Excitation Current Test Conditions/Comments ...... 5
Added Table 3 .................................................................................... 9
Changes to Figure 36, Figure 37, and Figure 39 ......................... 21
Changes to Respiration (ADAS1000-4 Model Only) Section
and Figure 63 ................................................................................... 34
Changes to Figure 64...................................................................... 35
Changes to Figure 65...................................................................... 36
Added Evaluating Pace Detection Performance Section .......... 40
Changes to Clocks Section ............................................................ 49
Changes to RESPAMP Bits Function Description, Table 29 .... 55
11/12—Revision 0: Initial Version