ADAS1000-4BSTZ datasheet(25/80 Pages) AD

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Data Sheet

ADAS1000-3/ADAS1000-4

10B

APPLICATIONS INFORMATION

20B

OVERVIEW

The ADAS1000-3/ADAS1000-4 are electro cardiac (ECG)

front-end solutions targeted at a variety of medical applica-

tions. In addition to ECG measurements, the ADAS1000-3/

ADAS1000-4 also measure thoracic impedance (respiration)

and detect 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 ADAS1000-3/ADAS1000-4 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, microproces-

sor, or FPGA. The ADAS1000-3/ADAS1000-4 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 readback of all relevant register address space.

Figure 52. ADAS1000-3 Simplified Block Diagram

COMMON-

MODE AMP

RLD_SJ

DRIVEN

LEAD

AMP

SHIELD

DRIVE

AMP

SHIELD

ECG1_LA

ECG2_LL

ECG3_RA

LEAD-OFF

DETECTION

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

DC LEAD-

OFF/MUXES

VCM_REF

(1.3V)

CALIBRATION

DAC

CLK_IO

AVDD

ADCVDD

DVDD

GPIO3

GPIO1/MSCLK

GPIO2/MSDO

GPIO0/MCS

AMP

ECG PATH

VREF

FILTERS,

CONTROL,

AND

INTERFACE

LOGIC

REFGND

CM_OUT/WCT

ADCVDD, DVDD

1.8V

REGULATORS

ADAS1000-3

VCM

ADC

AMP

ADC

LEAD-OFF

DAC

Rev. B | Page 25 of 80

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