Data Acquisition Block for ECG Systems, discrete LEAD I ECG implementation Reference Design
TIPD116
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Key Document

Description

This TI Verified Design is for Electrocardiography (ECG), the measurement of the electrical activity of the heart, a method that requires a precision analog front end instrumentation gain stage, filtering, and high resolution digital conversion. This design features the methodology for achieving a LEAD I ECG measurement system designed from discrete analog components. Ultra low power is optimized by an instrumentation front end using an OPA2333 and is digitized by the 18 bit ADS8881.

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Features
  • 18 Bit, 10ksps Sampling Rate
  • 200Hz ECG Signals
  • Optimization: ECG
  • Power: 1.5mW @ AVDD = 3.3V
  • Utilizes ADS8881 (18bit, 1Msps SAR ADC), OPA2333 (Input/INA), OPA313 + REF3330 (Reference) 
  • This Verified Design Includes:

  • Theory
  • Component Selection
  • TINA-TI Simulation
  • Schematics and PCB Layout
  • Verification and Measured Performance
  • Modification Options
  •  


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Design Files

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TI Devices (4)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
ADS8881  18-Bit, 1-MSPS, 1-ch SAR ADC with true-ifferential input, SPI interface and daisy-chain  Analog-to-digital converters (ADCs)  Sample & Buy View Design Kits & Evaluation Modules
OPA2333  1.8V, 17µA, 2 channels, microPower, Precision, Zero Drift CMOS Op Amp  Operational amplifiers (op amps)  Sample & Buy View Design Kits & Evaluation Modules
OPA313  1-MHz, Micropower, Low-Noise, Rail-to-Rail I/O 1.8-V Operational Amplifier  Operational amplifiers (op amps)  Sample & Buy View Design Kits & Evaluation Modules
REF3330  30ppm/°C Drift, 3.9µA, SOT23-3, SC70-3, UQFN-8 Series Voltage Reference  Voltage references  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
ADS8881 Download Download
OPA2333 Download Download
Download Download
Download Download
OPA313 Download
Download Download
REF3330 Download Download
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Technical Documents

See the Important Notice and Disclaimer covering reference designs and other TI resources.

User guides (1)
Title Type Size (KB) Date
PDF 1222 18 Jun 2013
Design files (3)
Title Type Size (KB) Date
ZIP 1295 20 Sep 2013
PDF 78 20 Sep 2013
PDF 102 20 Sep 2013
More literature (1)
Title Type Size (KB) Date
PDF 743 13 Jan 2015
Related Tools & Software

Development Tools (1)

Name Part Number Tool Type
SPICE-based analog simulation program  TINA-TI  Circuit Design & Simulation 

Software (2)



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