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TIPD116

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

Design files

TIPD116

Design files

Overview

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.

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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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.

download Schematic — TIPD116
TIDR213.PDF (102 K)

Detailed schematic diagram for design layout and components

download Schematic — TIPD116
SLAC586.ZIP (1500 K)

Detailed schematic diagram for design layout and components

download Bill of materials (BOM) — TIPD116
TIDR214.PDF (78 K)

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

download Gerber file — TIPD116
TIDC162.ZIP (1295 K)

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

Products

Includes TI products in the design and potential alternatives.

Precision ADCs

ADS8881 — 18-Bit, 1-MSPS, 1-Ch SAR ADC with True-Differential Input, SPI Interface and Daisy-Chain

Data sheet: PDF | HTML
General-purpose op amps

OPA313 — Single, 5.5-V, 1-MHz, low quiescent current (50-μA), RRIO operational amplifier

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

OPA2333 — 1.8-V, 17-µA, two-channel, micropower zero-drift CMOS operational amplifier

Data sheet: PDF | HTML
Series voltage references

REF3330 — 30-ppm/°C drift, 3.9µA, 3-pin SOT-23, 3-pin SC70, 8-pin UQFN series voltage reference

Data sheet: PDF | HTML

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Software

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

SIMULATION TOOL
TINA-TI — SPICE-based analog simulation program

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