Datasheet

ADAS1000-3/ADAS1000-4 Data Sheet
Rev. A | Page 24 of 76
APPLICATIONS INFORMATION
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
AC
LEAD-OFF
DETECTION
RLD_OUT CM_IN
VREF
REFOUT
XTAL1 XTAL2
PD
CS
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
AMP
ECG PATH
VREF
FILTERS,
CONTROL,
AND
INTERFACE
LOGIC
REFGND
CM_OUT/WCT
ADCVDD, DVDD
1.8V
REGULATORS
ADAS1000-3
10kΩ
VCM
ADC
ADC
AMP
ADC
AC
LEAD-OFF
DAC
10997-012