ADAS1000BSTZ datasheet(25/80 Pages) AD

25 / 80 page

Data Sheet

ADAS1000/ADAS1000-1/ADAS1000-2

Rev. A | Page 25 of 80

APPLICATIONS INFORMATION

OVERVIEW

The ADAS1000/ADAS1000-1/ADAS1000-2 are electro cardiac

(ECG) front-end solutions targeted at a variety of medical

applications. In addition to ECG measurements, the ADAS1000

version also measures thoracic impedance (respiration) and

detects pacing artifacts, providing all the measured information

to the host controller in the form of a data frame supplying

either lead/vector or electrode data at programmable data rates.

The ADAS1000/ADAS1000-1/ADAS1000-2 are designed to

simplify the task of acquiring ECG signals for use in both

monitor and diagnostic applications. Value-added cardiac

post processing may be executed externally on a DSP,

microprocessor, or FPGA. The ADAS1000/ADAS1000-1/

ADAS1000-2 are designed for operation in both low power,

portable telemetry applications and line powered systems;

therefore, the parts offer power/noise scaling to ensure

suitability to these varying requirements.

The devices also offer a suite of dc and ac test excitation via

a calibration DAC feature and CRC redundancy checks in

addition to read-back of all relevant register address space.

Figure 53. ADAS1000 Simplified Block Diagram

–

RLD_SJ

DRIVEN

LEAD

AMP

SHIELD

DRIVE

AMP

SHIELD

ECG1_LA

ECG2_LL

ECG3_RA

ECG4_V1

ECG5_V2

RLD_OUT CM_IN

VREF

REFOUT

XTAL1

XTAL2

SCLK

SDI

DGND

SDO

DRDY

RESET

AGND

IOVDD

CLOCK GEN/OSC/

EXTERNAL CLK

SOURCE

SYNC_GANG

REFIN

CAL_DAC_IO

RESPIRATION PATH

EXT_RESP_LA

EXT_RESP_LL

DC LEAD-

OFF/MUXES

VCM_REF

(1.3V)

LEAD-OFF

DAC

RESPIRATION

DAC

CALIBRATION

DAC

CLK_IO

AVDD

ADCVDD

DVDD

GPIO3

GPIO1/MSCLK

GPIO2/MSDO

GPIO0/MCS

AMP

ECG PATH

VREF

FILTERS,

CONTROL,

AND

INTERFACE

LOGIC

EXT_RESP_RA

RESPDAC_LA

RESPDAC_LL

RESPDAC_RA

MUX

REFGND

CM_OUT/WCT

ADCVDD, DVDD

1.8V

REGULATORS

ADAS1000

VCM

AMP

ADC

AMP

ADC

AMP

ADC

AMP

ADC

–

LEAD-OFF

DETECTION

PACE

DETECTION

COMMON-

MODE AMP

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