Data Sheet
ADAS1021
ADI Confidential
5-Channel ECG AFE with Respiration, Pacemaker Detection
and Lead-Off/Quality Detection
FEATURES
SIMPLIFIED FUNCTIONAL BLOCK DIAGRAM
► 5 ECG acquisition channels and 1 driven reference
► Flexible front-end arrangement allows right arm electrode or
WCT referenced
► Dedicated per channel Σ-Δ ADC
► 50 mV typical calibration signal for gain correction
► Digital 50 Hz or 60 Hz mains power line filtering
► Flexible pacemaker detection capability
► Digital detection algorithm on selectable 3 of 5 ECG channels
► Programmable threshold levels
► Dedicated high sample rate SAR ADCs
► Lead-off or lead fail detection
► DC lead-off detection on ECG and RLD_OUT
► Programmable polarity, current, and threshold levels
► AC lead quality measurement
Figure 1.
► Programmable polarity, current
► Reference electrode drive
GENERAL DESCRIPTION
The ADAS1021 is a highly integrated, analog front end (AFE)
designed for measurement of patient biopotential information. The
primary measurement performed is electrocardiogram (ECG) activi-
ty, where the ADAS1021 employs dedicated Σ-Δ analog-to-digital
converters (ADCs) per channel to acquire and digitize on a lead
basis. The signal acquisition is architected to support low noise,
diagnostic level measurement in the presence of a variety of inter-
ferers.
► Flexible redirection to other electrodes if RLD lead failure
► Respiration measurement using impedance pneumography
► Shield drive amplifier
► Parallel ICs for larger lead count configurations
► SPI communication and 8 user programmable GPIOs
► Power
► Low power architecture
► Single channel ECG power: 3.04 mW
► 3 channel ECG power: 4.95 mW
► 5 channel ECG power: 7.64 mW
The ADAS1021 also includes three dedicated successive approx-
imation register (SAR) ADCs to digitize the high frequency pace-
maker content that is analyzed by the on-chip pacemaker detection
algorithm.
► Designed for use with ADP5320 PMU
► Operates from 2 or 3 voltage rails: 5 V, 1.8 V, or 1.2 V
► Packages and temperature range
► Operating temperature range: −10°C to +85°C
► Package: 65-ball, 5.6 mm × 6.2 mm WLCSP
A dedicated and flexible impedance measurement block captures
impedance variation during patient respiration and is available on
multiple leads.
The ADAS1021 has a number of complementary features support-
ing ECG measurement: driven reference for common-mode rejec-
tion and lead-off detection that identifies if an electrode connection
is degrading or has fallen off. The product also includes a shield
drive amplifier to bias the shield of the cable.
► Supports medical standards: IEC 60601-2-25 Ed. 2.0 2011,
IEC 60601-2-27 Ed. 3.0 2011, and IEC 60601-2-47 Ed. 2.0 2012
APPLICATIONS
► Portable and line powered ECG monitor and diagnostic meas-
urement
► Battery powered ECG equipment
For up to date information on the production release timelines, contact your local Analog Devices, Inc., sales representatives or send an email
to ADAS1021@analog.com.
Rev. SpA
Information furnished by Analog Devices is believed to be accurate and reliable "as is". However, no responsibility is assumed by Analog
Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications subject to
DOCUMENT FEEDBACK
change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and
registered trademarks are the property of their respective owners.
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