ADAS1000-2(RevA) Просмотр технического описания (PDF) - Analog Devices

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ADAS1000-2
(Rev.:RevA)

Low Power, Five Electrode Electrocardiogram (ECG) Analog Front End

Analog Devices 

Data Sheet

ADAS1000/ADAS1000-1/ADAS1000-2

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.

REFIN REFOUT CAL_DAC_IO RLD_SJ RLD_OUT CM_IN

CM_OUT/WCT SHIELD

VREF

CALIBRATION

DAC

RESPIRATION

DAC

AC

LEAD-OFF

DAC

DRIVEN

LEAD

AMP

VCM_REF

(1.3V)

SHIELD

DRIVE

AMP

COMMON-

MODE AMP

VCM

VREF

ECG1_LA

DC LEAD-

OFF/MUXES

ECG PATH

AMP

ADC

ECG2_LL

AMP

ADC

ECG3_RA

AMP

ADC

ECG4_V1

AMP

ADC

AVDD IOVDD

ADCVDD, DVDD

1.8V

REGULATORS

ADCVDD

DVDD

ADAS1000

AC

LEAD-OFF

DETECTION

PACE

DETECTION

FILTERS,

CONTROL,

AND

INTERFACE

LOGIC

CS

SCLK

SDI

SDO

DRDY

PD

RESET

SYNC_GANG

ECG5_V2

EXT_RESP_LA

EXT_RESP_LL

EXT_RESP_RA

RESPDAC_LA

RESPDAC_LL

RESPDAC_RA

AMP

ADC

AMP

ADC

MUX

RESPIRATION PATH

REFGND AGND

DGND

Figure 53. ADAS1000 Simplified Block Diagram

GPIO0/MCS

GPIO1/MSCLK

GPIO2/MSDO

GPIO3

CLOCK GEN/OSC/

EXTERNAL CLK

SOURCE

XTAL1 XTAL2

CLK_IO

Rev. A | Page 25 of 80

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