ADAS1021

RECOMMENDED FOR NEW DESIGNS

5-Channel ECG AFE with Respiration, Pacemaker Detection and Lead-Off/Quality Detection

Analog Devices ADAS1021 Product Info

10 February 2026 5

Features

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
  - Programmable polarity, current
Reference electrode drive
- 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
- 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 r

Part details & applications

The ADAS1021 is a highly integrated, analog front end (AFE) designed for measurement of patient biopotential information. The primary measurement performed is electrocardiogram (ECG) activity, 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 interferers.

The ADAS1021 also includes three dedicated successive approximation register (SAR) ADCs to digitize the high frequency pacemaker content that is analyzed by the on-chip pacemaker detection algorithm.

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 supporting ECG measurement: driven reference for common-mode rejection 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.

Applications

Portable and line powered ECG monitor and diagnostic measurement
Battery powered ECG equipment

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