Low Power, Three Electrode Electrocardiogram (ECG) Analog Front End Data Sheet ADAS1000-3/ADAS1000-4 The ADAS1000-4 is a full-featured, 3-channel ECG including FEATURES respiration and pace detection, while the ADAS1000-3 offers Biopotential signals in digitized signals out only ECG channels with no respiration or pace features. 3 acquisition (ECG) channels and one driven lead Can be ganged for 8 electrode + RLD using master The ADAS1000-3/ADAS1000-4 are designed to simplify ADAS1000 or ADAS1000-1 the task of acquiring and ensuring quality ECG signals. AC and DC lead-off detection They provide a low power, small data acquisition system for Internal pace detection algorithm on 3 leads biopotential applications. Auxiliary features that aid in better Support for users own pace quality ECG signal acquisition include: multichannel averaged Thoracic impedance measurement (internal/external path) driven lead, selectable reference drive, fast overload recovery, Selectable reference lead flexible respiration circuitry returning magnitude and phase Scalable noise vs. power control, power-down modes information, internal pace detection algorithm operating Low power operation from on three leads, and the option of ac or dc lead-off detection. 11 mW (1 lead), 15 mW (3 leads) Several digital output options ensure flexibility when monitor- Lead or electrode data available ing and analyzing signals. Value-added cardiac post processing Supports AAMI EC11:1991/(R)2001/(R)2007, AAMI EC38 is executed externally on a DSP, microprocessor, or FPGA. R2007, EC13:2002/(R)2007, IEC60601-1 ed. 3.0 b:2005, Because ECG systems span different applications, the IEC60601-2-25 ed. 2.0 :2011, IEC60601-2-27 ed. 2.0 ADAS1000-3/ADAS1000-4 feature a power/noise scaling b:2005, IEC60601-2-51 ed. 1.0 b: 2005 architecture where the noise can be reduced at the expense Fast overload recovery of increasing power consumption. Signal acquisition channels Low or high speed data output rates may be shut down to save power. Data rates can be reduced to Serial interface SPI-/QSPI-/DSP-compatible save power. 56-lead LFCSP package (9 mm 9 mm) To ease manufacturing tests and development as well as offer 64-lead LQFP package (10 mm 10 mm body size) holistic power-up testing, the ADAS1000-3/ADAS1000-4 APPLICATIONS offer a suite of features, such as dc and ac test excitation via ECG: monitor and diagnostic the calibration DAC and CRC redundancy testing in addition Bedside patient monitoring, portable telemetry, Holter, to readback of all relevant register address space. AED, cardiac defibrillators, ambulatory monitors, pace The input structure is a differential amplifier input thereby maker programmer, patient transport, stress testing allowing users a variety of configuration options to best suit GENERAL DESCRIPTION their application. The ADAS1000-3/ADAS1000-4 measure electro cardiac (ECG) The ADAS1000-3/ADAS1000-4 are available in two package signals, thoracic impedance, pacing artifacts, and lead-on/off options: either a 56-lead LFCSP or a 64-lead LQFP package status and output this information in the form of a data frame they are specified over 40C to +85C temperature range. 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. Rev. B 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. 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Technical Support www.analog.com ADAS1000-3/ADAS1000-4 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 Evaluating Respiration Performance ....................................... 41 Applications ....................................................................................... 1 Pacing Artifact Detection Function (ADAS1000-4 Only).... 41 General Description ......................................................................... 1 Biventricular Pacers ................................................................... 45 Revision History ............................................................................... 3 Pace Detection Measurements ................................................. 45 Functional Block Diagram .............................................................. 4 Evaluating Pace Detection Performance ................................. 45 Specifications ..................................................................................... 5 Pace Width .................................................................................. 45 Noise Performance ..................................................................... 10 Pace Latency ................................................................................ 45 Timing Characteristics .............................................................. 11 Pace Detection via Secondary Serial Interface ....................... 45 Absolute Maximum Ratings .......................................................... 14 Filtering ....................................................................................... 46 Thermal Resistance .................................................................... 14 Voltage Reference ....................................................................... 47 ESD Caution ................................................................................ 14 Gang Mode Operation ............................................................... 47 Pin Configurations and Function Descriptions ......................... 15 Interfacing in Gang Mode ......................................................... 50 Typical Performance Characteristics ........................................... 18 Serial Interfaces ............................................................................... 51 Applications Information .............................................................. 25 Standard Serial Interface ........................................................... 51 Overview ...................................................................................... 25 Secondary Serial Interface ......................................................... 55 ECG InputsElectrodes/Leads ................................................ 27 RESET .......................................................................................... 55 ECG Channel .............................................................................. 28 PD Function ................................................................................ 55 Electrode/Lead Formation and Input Stage Configuration .. 29 SPI Output Frame Structure (ECG and Status Data) ................ 56 Defibrillator Protection ............................................................. 33 SPI Register Definitions and Memory Map ................................ 57 ESIS Filtering............................................................................... 33 Control Registers Details ............................................................... 58 ECG Path Input Multiplexing ................................................... 33 Interface Examples ..................................................................... 74 Common-Mode Selection and Averaging .............................. 34 Software Flowchart .................................................................... 77 Wilson Central Terminal (WCT) ............................................. 35 Power Supply, Grounding, and Decoupling Strategy ............ 78 Right Leg Drive/Reference Drive ............................................. 35 AVDD .......................................................................................... 78 Calibration DAC ......................................................................... 36 ADCVDD and DVDD Supplies ............................................... 78 Gain Calibration ......................................................................... 36 Unused Pins/Paths ..................................................................... 78 Lead-Off Detection .................................................................... 36 Layout Recommendations ........................................................ 78 Shield Driver ............................................................................... 37 Outline Dimensions ....................................................................... 79 Respiration (ADAS1000-4 Model Only) ................................. 37 Ordering Guide .......................................................................... 80 Rev. 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