Low Power, Five Electrode Electrocardiogram (ECG) Analog Front End Data Sheet ADAS1000/ADAS1000-1/ADAS1000-2 The ADAS1000 is a full-featured, 5-channel ECG including FEATURES respiration and pace detection, while the ADAS1000-1 offers Biopotential signals in digitized signals out only ECG channels with no respiration or pace features. Similarly, 5 acquisition (ECG) channels and one driven lead the ADAS1000-2 is a subset of the main device and is configured Parallel ICs for up to 10+ electrode measurements for gang purposes with only the ECG channels enabled (no Master ADAS1000 or ADAS1000-1 used with slave respiration, pace, or right leg drive). ADAS1000-2 AC and dc lead-off detection The ADAS1000/ADAS1000-1/ADAS1000-2 are designed to Internal pace detection algorithm on 3 leads simplify the task of acquiring and ensuring quality ECG signals. Support for users own pace They provide a low power, small data acquisition system for Thoracic impedance measurement (internal/external path) biopotential applications. Auxiliary features that aid in better Selectable reference lead quality ECG signal acquisition include multichannel averaged Scalable noise vs. power control, power-down modes driven lead, selectable reference drive, fast overload recovery, Low power operation from flexible respiration circuitry returning magnitude and phase 11 mW (1 lead), 15 mW (3 leads), 21 mW (all electrodes) information, internal pace detection algorithm operating on Lead or electrode data available three leads, and the option of ac or dc lead-off detection. Several Supports AAMI EC11:1991/(R)2001/(R)2007, AAMI EC38 digital output options ensure flexibility when monitoring and R2007, EC13:2002/(R)2007, IEC60601-1 ed. 3.0 b:2005, analyzing signals. Value-added cardiac post processing is IEC60601-2-25 ed. 2.0 :2011, IEC60601-2-27 ed. 2.0 executed externally on a DSP, microprocessor, or FPGA. b:2005, IEC60601-2-51 ed. 1.0 b: 2005 Because ECG systems span different applications, the Fast overload recovery ADAS1000/ADAS1000-1/ADAS1000-2 feature a power/noise Low or high speed data output rates scaling architecture where the noise can be reduced at the Serial interface SPI-/QSPI-/DSP-compatible expense of increasing power consumption. Signal acquisition 56-lead LFCSP package (9 mm 9 mm) channels can be shut down to save power. Data rates can be 64-lead LQFP package (10 mm 10 mm body size) reduced to save power. APPLICATIONS To ease manufacturing tests and development as well as offer ECG: monitor and diagnostic holistic power-up testing, the ADAS1000/ADAS1000-1/ Bedside patient monitoring, portable telemetry, Holter, ADAS1000-2 offer a suite of features, such as dc and ac test AED, cardiac defibrillators, ambulatory monitors, pace excitation via the calibration DAC and cyclic redundancy check maker programmer, patient transport, stress testing (CRC) redundancy testing, in addition to readback of all relevant register address space. GENERAL DESCRIPTION The input structure is a differential amplifier input, thereby The ADAS1000/ADAS1000-1/ADAS1000-2 measure electro allowing users a variety of configuration options to best suit cardiac (ECG) signals, thoracic impedance, pacing artifacts, their application. and lead-on/lead-off status and output this information in the form of a data frame supplying either lead/vector or electrode The ADAS1000/ADAS1000-1/ADAS1000-2 are available in two data at programmable data rates. Its low power and small size package options, a 56-lead LFCSP package and a 64-lead LQFP make it suitable for portable, battery-powered applications. package. Both packages are specified over a 40C to +85C The high performance also makes it suitable for higher end temperature range. diagnostic machines. Rev. C Document Feedback Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. rights of third parties that may result from its use. Specifications subject to change without notice. No Tel: 781.329.4700 20122018 Analog Devices, Inc. All rights reserved. license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Technical Support www.analog.com Trademarks and registered trademarks are the property of their respective owners. ADAS1000/ADAS1000-1/ADAS1000-2 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 Pacing Artifact Detection Function (ADAS1000 Only) ....... 45 Applications ....................................................................................... 1 Biventricular Pacers ................................................................... 48 General Description ......................................................................... 1 Pace Detection Measurements ................................................. 48 Revision History ............................................................................... 3 Evaluating Pace Detection Performance ................................. 48 Functional Block Diagram .............................................................. 4 Pace Width .................................................................................. 48 Specifications ..................................................................................... 5 Pace Latency ................................................................................ 48 Noise Performance ..................................................................... 10 Pace Detection via Secondary Serial Interface (ADAS1000 and ADAS1000-1 Only) ............................................................ 48 Timing Characteristics .............................................................. 11 Filtering ........................................................................................ 49 Absolute Maximum Ratings .......................................................... 14 Voltage Reference ....................................................................... 50 Thermal Resistance .................................................................... 14 Gang Mode Operation ............................................................... 50 ESD Caution ................................................................................ 14 Interfacing in Gang Mode ......................................................... 52 Pin Configurations and Function Descriptions ......................... 15 Serial Interfaces ............................................................................... 54 Typical Performance Characteristics ........................................... 19 Standard Serial Interface ........................................................... 54 Applications Information .............................................................. 26 SPI Interface Resync .................................................................. 56 Overview ...................................................................................... 26 Secondary Serial Interface ......................................................... 58 ECG InputsElectrodes/Leads ................................................ 29 RESET .......................................................................................... 58 ECG Channel .............................................................................. 30 PD Function ................................................................................ 58 Electrode/Lead Formation and Input Stage Configuration .. 31 SPI Output Frame Structure (ECG and Status Data) ................ 59 Defibrillator Protection ............................................................. 35 SPI Register Definitions and Memory Map ................................ 60 ESIS Filtering ............................................................................... 35 Control Registers Details ............................................................... 61 ECG Path Input Multiplexing ................................................... 35 Examples of Interfacing to the ADAS1000 ............................. 79 Common-Mode Selection and Averaging .............................. 36 Software Flowchart .................................................................... 82 Wilson Central Terminal (WCT) ............................................. 37 Power Supply, Grounding, and Decoupling Strategy ............ 83 Right Leg Drive/Reference Drive ............................................. 37 AVDD .......................................................................................... 83 Calibration DAC ......................................................................... 38 ADCVDD and DVDD Supplies ............................................... 83 Gain Calibration ......................................................................... 38 Unused Pins/Paths ..................................................................... 83 Lead-Off Detection .................................................................... 38 Layout Recommendations ........................................................ 83 AC Lead-Off Detection ............................................................... 39 Outline Dimensions ....................................................................... 84 Shield Driver ............................................................................... 40 Ordering Guide .......................................................................... 85 Respiration (ADAS1000 Model Only) ..................................... 40 Evaluating Respiration Performance ....................................... 43 Extend Switch On Respiration Paths ....................................... 44 Rev. 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