Simple thermocouple measurement reference design, less than 1°C accuracy


Design files


This thermocouple measurement verified design provides a very simple and accurate method way to implement thermocouple measurement. This design outlines the necessary anti-aliasing filters and biasing resistors to provide sensor diagnostics. This example also provides a novel way of accomplishing cold junction compensation for the system using the onboard temperature sensor on the ADS1118. For thermocouple linearization, the design also provides a very simple algorithm for linear that can be implemented on most microcontrollers.

  • Measures K-type thermocouple temperature
  • Accuracy <1 °C
  • Precision and repeatability of 0.2°C
  • Includes cold junction compensation
  • Includes software algorithm
  • Uses ADS1118 16-bit ADC with PGA
  • 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.

TIDR189.PDF (54 K)

Detailed schematic diagram for design layout and components

SLAC579.ZIP (330 K)

Detailed schematic diagram for design layout and components

TIDR190.PDF (65 K)

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

TIDC148.ZIP (281 K)

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


Includes TI products in the design and potential alternatives.

Precision ADCs

ADS111816-bit, 860-SPS, 4-channel, delta-sigma ADC with PGA, oscillator, VREF, temp sensor and SPI

Data sheet: PDF | HTML

Technical documentation

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Type Title Date
* User guide TIPD109 Verified Design Reference Guide Sep. 19, 2013

Related design resources

Design tools & simulation

TINA-TI SPICE-based analog simulation program

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