Datasheet

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
PD
CS
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)
AC
LEAD-OFF
DAC
RESPIRATION
DAC
CALIBRATION
DAC
CLK_IO
AVDD
ADCVDD
DVDD
GPIO3
GPIO1/MSCLK
GPIO2/MSDO
GPIO0/MCS
AMP
AMP
ECG PATH
VREF
FILTERS,
CONTROL,
AND
INTERFACE
LOGIC
EXT_RESP_RA
RESPDAC_LA
RESPDAC_LL
RESPDAC_RA
MUX
REFGND
CM_OUT/WCT
10k
Ω
ADCVDD, DVDD
1.8V
REGULATORS
ADAS1000
10k
Ω
VCM
AMP
ADC
ADC
ADC
AMP
ADC
AMP
ADC
AMP
ADC
–
+
AC
LEAD-OFF
DETECTION
PACE
DETECTION
COMMON-
MODE AMP
09660-011