ANALOG DEVICES ADAS1000, ADAS1000-1, ADAS1000-2 Service Manual

Low Power

, 5 Electrode

Rev. Pr.E

CAL_DAC

Electrocardiogram (ECG) Analog Front

Preliminary Technical Data

FEATURES

Biopotential signals in; digitized signals out 5

acquisition (ECG) channels + 1 driven lead Parallel ICs for up to 10+ Electrode measurements AC and DC Leads Off Detection Internal Pace Detection Algorithm on 3 leads Support for users own pace Thoracic Impedance Measurement (internal/external path) Selectable Reference Lead Scalable Noise vs. Power Control, Power Down Modes Low Power Operation from:

11mW (one lead), 14mW (3 leads), 21mW (all electrodes) Lead or Electrode Data available Supports AAMI EC11:1991/(R)2001/(R)2007,

EC13:2002/(R)2007, IEC60601-1 ed. 3.0b, 2005, IEC60601-

2-25 ed. 1.0b, IEC60601-2-27 ed. 2.0, 2005 IEC60601-2-51

ed. 1.0, 2005 Fast Overload Recovery Low or High speed Data Output Rates Serial interface SPI®-/QSPI™-/DSP-compatible 56 lead LFCSP package (9mm x9mm) 64 lead LQFP package (10mm x10mm Body size)

ADAS1000/ADAS1000-1/ADAS1000-2

APPLICATIONS

ECG: Monitor & Diagnostic Bedside Patient Monitoring, Portable Telemetry, Holter,

AED, Cardiac Defibrillators, Ambulatory Monitors, Pace Maker Programmer, Patient Transport, Stress testing,

GENERAL DESCRIPTION

The ADAS1000 measures electro cardiac (ECG) signals,

horacic impedance, pacing artifacts, lead on/off status and

t outputs this information in the form of a data frame supplying either Lead/Vector or Electrode data at programmable data rates. Its low power from 11mW 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 is designed to simplify the task of acquiring and ensuring quality ECG signals. Value-added cardiac postprocessing is executed externally on a DSP, microprocessor or FPGA. Several digital output options ensure flexibility when monitoring and analyzing signals. The ADAS1000 provides a low power, small data acquisition system for biopotential applications.

ELECTRODES

x 5

EXT RESP_LA

EXT RESP LL

EXT RESP_RA

REFOUTREFIN

VREF

CAL IBR ATION

DAC

RES PIRA TIO N

DAC

AC LEA DS

OFF DA C

FUNCTIONAL BLOCK DIAGRAM

SHIELD

DRIVE

AMP

ADC

SHIELD

DRIVE

MUXES

_IO

RLD_SJ

10k

Buffer

DRIVEN

LEAD

AMP

RLD_OUT

VCM

(1.3V)

CM_IN

CM_OUT/WCT

CO MM ON MO DE A MP

5 x ECG PATH

AMP

RESPIRATION PATH

Figure 1 Functional Block Diagram – ADAS1000 Full featured Model

AVDD

ADCVDD, DVDD

1.8V

Regulators

ADAS1000

AC LEADS

OFF

DETECTION

PACE

DETECTION

FILTERS,

CONTROL

INTERFACE

LOGIC

CLOCK GEN/OSC

/EXTERNALCLK

SOURCE

XTAL1 XTAL2

IOVDD

ADCVDD

DVDD

CS SCLK

SDI

SDO

DRDY

GPIO0/MCS

GPIO1/MSCL

GPIO2/MSDO

GPIO3

CLK_IO

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 rights of third parties that may result from its use. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective owners.

ADAS1000/ADAS1000-1/ADAS1000-2 Preliminary Technical Data

SHIEL

GENERAL DESCRIPTION - CONTINUED

Auxiliary features that aid in better quality ECG signal acquisition include: multi-channel averaged driven lead, selectable reference drive, fast over load recovery, flexible respiration circuitry returning magnitude and phase information, internal pace detection algorithm operating on 3 leads and option of AC or DC leads off detection. Since ECG systems span different applications, the ADAS1000 features a novel power/noise scaling architecture where the noise can be reduced at the expense of increasing power consumption. Signal acquisition channels may be shutdown to save power. Data rates can be reduced to save power. To ease manufacturing tests, development, as well as offer holistic power-up testing, the ADAS1000 offers a suite of dc and ac test excitation via the CAL DAC, CRC redundancy testing in addition to read-back of all relevant register address space. The ADAS1000 is a full featured 5 channel ECG including respiration and pace detection, while the ADAS1000-1 offers only ECG channels with no respiration or pace features. Similarly the ADAS1000-2 is a subset of the main device and is configured for gang purposes with only ECG channels enabled (no respiration, pace, RLD, etc). The input structure is a differential amplifier input thereby allowing the user a variety of configuration options to best suit their application.

The ADAS1000 variants are available in two package options, either a 56 lead LFCSP or a 64 lead LQFP package and are specified over -40°C to +85°C temperature range.

IOVDD

REFIN CAL_DAC_IO

CALIBRA TION

ECG1 (LA)

ECG 2 (LL)

ECG 3 (RA)

ECG 4 (V1)

REFOUT

VREF

DAC

RESPIR ATION

DAC

AC LEA DS

OFF DA C

DC LEADS

OFF/MUXES

RLD_SJ

10k

RLD_OUT CM_IN

DRIVEN

LEAD

AMP

VCM

(1.3V)

10k

COM MON

MOD E AMP

CM_OUT/WCT

SHIELD

DRIVE

AMP

DRIVE

ADAS1000

VREF

ECG PATH

AMP

ADC

VDD

ADCVDD, DVDD

1.8V

Regulators

AC LEADS

OFF

DETECTION

PACE

DETECTION

FILTERS,

CONTROL

INTERFACE

LOGIC

ADCVDD

DVDD

SCLK

SDI

SDO

DRDY

RESET SYNC_GANG

ECG 5 (V2)

EXT RESP_LA

EXT RESP LL

EXT RESP_RA

RESPDAC_LA

RESPDAC_LL

RESPDAC_RA

MUX

AMP

ADC

RESPIRATION PATH

AGND

REFGND

DGND

Figure 2. ADAS1000 Model Simplified Block Diagram

CLOCK GEN/OSC

/EXTERNAL CLK

SOURCE

XTAL1 XTAL2

GPIO0/MCS GPIO1/MSCL

GPIO2/MSDO

GPIO3

CLK_IO

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