ADAS1000-4 ECG AFE: Pinout, Features and Datasheet

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The ADAS1000-4 is a full-featured, 3-channel ECG including respiration and pace detection. The ADAS1000-4 is designed to simplify the task of acquiring and ensuring quality ECG signals. It provides a low power, small data acquisition system for biopotential applications. Auxiliary features that aid in better quality ECG signal acquisition include: multichannel averaged driven lead, selectable reference drive, fast overload recovery, flexible respiration circuitry returning magnitude and phase information, internal pace detection algorithm operating on three leads, and the option of ac or dc lead-off detection. Several digital output options ensure flexibility when monitoring and analyzing signals. Value-added cardiac post processing is executed externally on a DSP, microprocessor, or FPGA. The ADAS1000-4 is available in two package options: either a 56-lead LFCSP or a 64-lead LQFP package; it is specified over −40°C to +85°C temperature range.

This article provides you with a basic overview of the ADAS1000-4 ECG Analog Front End, including its pin descriptions, features and specifications, etc., to help you quickly understand what ADAS1000-4 is.

● Biopotential signals in; digitized signals out

● 3 acquisition (ECG) channels and one driven lead

● Can be ganged for 8 electrode + RLD using master

● AC and DC lead-off detection

● Internal pace detection algorithm on 3 leads: Support for user’s own pace

● Thoracic impedance measurement (internal/external path)

● Selectable reference lead

● Scalable noise vs. power control, power-down modes

● Low power operation from: 11 mW (1 lead), 15 mW (3 leads)

● Lead or electrode data available

● Supports AAMI EC11:1991/(R)2001/(R)2007, AAMI EC38 R2007, EC13:2002/(R)2007, IEC60601-1 ed. 3.0 b:2005,                     IEC60601-2-25 ed. 2.0 :2011, IEC60601-2-27 ed. 2.0 b:2005, IEC60601-2-51 ed. 1.0 b: 2005

● Fast overload recovery

● Low or high speed data output rates

● Serial interface SPI-/QSPI™-/DSP-compatible

● 64-lead LQFP package (10 mm × 10 mm body size)

The ADAS1000-4 provides user programmable variables to optimize the performance of the algorithm within the ECG system, given all these limiting elements. The ADAS1000-4 has a high performance, low noise, on-chip 1.8 V reference for use in the ADC and DAC circuits. The ADAS1000-4 runs from an external crystal or clock input frequency of 8.192 MHz. The external clock input is provided for use in gang mode so conversions between the two devices are synchronized.

The ADAS1000-4 measures electro cardiac (ECG) signals, thoracic impedance, pacing artifacts, and lead-on/off status and output this information in the form of a data frame supplying either lead/vector or electrode data at programmable data rates. Its low power and small size make it suitable for portable, battery-powered applications. The high performance also makes it suitable for higher end diagnostic machines. Because ECG systems span different applications, the ADAS1000-4 features a power/noise scaling architecture where the noise can be reduced at the expense of increasing power consumption. Signal acquisition channels may be shut down to save power. Data rates can be reduced to save power. To ease manufacturing tests and development as well as offer holistic power-up testing, the ADAS1000-4 offers a suite of features, such as dc and ac test excitation via the calibration DAC and CRC redundancy testing in addition to readback of all relevant register address space. The input structure is a differential amplifier input thereby allowing users a variety of configuration options to best suit their application.

Analog Devices Inc. ADAS1000-4BSTZ technical specifications, attributes, parameters and parts with similar specifications to Analog Devices Inc. ADAS1000-4BSTZ.

Simplified Block Diagram

Simplified Respiration Block Diagram

3-Channel Full Featured Model

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Analog Devices (NASDAQ: ADI) is a world leader in the design, manufacture, and marketing of a broad portfolio of high performance analog, mixed-signal, and digital signal processing (DSP) integrated circuits (ICs) used in virtually all types of electronic equipment. Since our inception in 1965, we have focused on solving the engineering challenges associated with signal processing in electronic equipment. Used by over 100,000 customers worldwide, our signal processing products play a fundamental role in converting, conditioning, and processing real-world phenomena such as temperature, pressure, sound, light, speed, and motion into electrical signals to be used in a wide array of electronic devices.