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Analog Devices Semiconductor Electronic Components Datasheet

ADAS1000-3 Datasheet

Three Electrode Electrocardiogram (ECG) Analog Front End

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Data Sheet
Low Power, Three Electrode
Electrocardiogram (ECG) Analog Front End
ADAS1000-3/ADAS1000-4
FEATURES
Biopotential signals in; digitized signals out
3 acquisition (ECG) channels and one driven lead
Can be ganged for 8 electrode + RLD using master
ADAS1000 or ADAS1000-1
AC and DC lead-off detection
Internal pace detection algorithm on 3 leads
Support for user’s own pace
Thoracic impedance measurement (internal/external path)
Selectable reference lead
Scalable noise vs. power control, power-down modes
Low power operation from
11 mW (1 lead), 15 mW (3 leads)
Lead or electrode data available
Supports AAMI EC11:1991/(R)2001/(R)2007, AAMI EC38
R2007, EC13:2002/(R)2007, IEC60601-1 ed. 3.0 b:2005,
IEC60601-2-25 ed. 2.0 :2011, IEC60601-2-27 ed. 2.0
b:2005, IEC60601-2-51 ed. 1.0 b: 2005
Fast overload recovery
Low or high speed data output rates
Serial interface SPI-/QSPI™-/DSP-compatible
56-lead LFCSP package (9 mm × 9 mm)
64-lead LQFP package (10 mm × 10 mm body size)
APPLICATIONS
ECG: monitor and diagnostic
Bedside patient monitoring, portable telemetry, Holter,
AED, cardiac defibrillators, ambulatory monitors, pace
maker programmer, patient transport, stress testing
GENERAL DESCRIPTION
The ADAS1000-3/ADAS1000-4 measure electro cardiac (ECG)
signals, thoracic impedance, pacing artifacts, and lead-on/off
status and output this information in the form of a data frame
supplying either lead/vector or electrode data at programmable
data rates. Its low power and small size make it suitable for
portable, battery-powered applications. The high performance
also makes it suitable for higher end diagnostic machines.
The ADAS1000-4 is a full-featured, 3-channel ECG including
respiration and pace detection, while the ADAS1000-3 offers
only ECG channels with no respiration or pace features.
The ADAS1000-3/ADAS1000-4 are designed to simplify
the task of acquiring and ensuring quality ECG signals.
They provide a low power, small data acquisition system for
biopotential applications. Auxiliary features that aid in better
quality ECG signal acquisition include: multichannel averaged
driven lead, selectable reference drive, fast overload recovery,
flexible respiration circuitry returning magnitude and phase
information, internal pace detection algorithm operating
on three leads, and the option of ac or dc lead-off detection.
Several digital output options ensure flexibility when monitor-
ing and analyzing signals. Value-added cardiac post processing
is executed externally on a DSP, microprocessor, or FPGA.
Because ECG systems span different applications, the
ADAS1000-3/ADAS1000-4 feature a power/noise scaling
architecture where the noise can be reduced at the expense
of increasing power consumption. Signal acquisition channels
may be shut down to save power. Data rates can be reduced to
save power.
To ease manufacturing tests and development as well as offer
holistic power-up testing, the ADAS1000-3/ADAS1000-4
offer a suite of features, such as dc and ac test excitation via
the calibration DAC and CRC redundancy testing in addition
to readback of all relevant register address space.
The input structure is a differential amplifier input thereby
allowing users a variety of configuration options to best suit
their application.
The ADAS1000-3/ADAS1000-4 are available in two package
options: either a 56-lead LFCSP or a 64-lead LQFP package;
they are specified over −40°C to +85°C temperature range.
Rev. B
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Analog Devices Semiconductor Electronic Components Datasheet

ADAS1000-3 Datasheet

Three Electrode Electrocardiogram (ECG) Analog Front End

No Preview Available !

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


Part Number ADAS1000-3
Description Three Electrode Electrocardiogram (ECG) Analog Front End
Maker Analog Devices
Total Page 30 Pages
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