Data acquisition for ECG systems, discrete LEAD I ECG implementation reference design


Design files


This 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.

  • 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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A fully assembled board has been developed for testing and performance validation only, and is not available for sale.

Design files & products

Design files

Download ready-to-use system files to speed your design process.

TIDR213.PDF (102 K)

Detailed schematic diagram for design layout and components

SLAC586.ZIP (1500 K)

Detailed schematic diagram for design layout and components

TIDR214.PDF (78 K)

Complete listing of design components, reference designators, and manufacturers/part numbers

TIDC162.ZIP (1295 K)

Design file that contains information on physical board layer of design PCB


Includes TI products in the design and potential alternatives.

Precision ADCs

ADS888118-Bit, 1-MSPS, 1-Ch SAR ADC with True-Differential Input, SPI Interface and Daisy-Chain

Data sheet: PDF | HTML
General-purpose op amps

OPA313Single, 5.5-V, 1-MHz, low quiescent current (50-μA), RRIO operational amplifier

Data sheet: PDF
Precision op amps (Vos<1mV)

OPA23331.8-V, 17-µA, two-channel, micropower zero-drift CMOS operational amplifier

Data sheet: PDF | HTML
Series voltage references

REF333030-ppm/°C drift, 3.9µA, 3-pin SOT-23, 3-pin SC70, 8-pin UQFN series voltage reference

Data sheet: PDF | HTML

Start development


Technical documentation

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Type Title Date
* User guide TIPD116 Verified Design Reference Guide Jun. 18, 2013
More literature Precision Amplifier Quickstart Kit brochure (Rev. A) Jan. 13, 2015

Related design resources

Design tools & simulation

TINA-TI SPICE-based analog simulation program

Support & training

TI E2E™ forums with technical support from TI engineers

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