RTD to Voltage Reference Design Using Instrumentation Amplifier and Current Reference


Design files


This reference design translates resistance temperature detectors (RTD) resistance to a voltage level convenient for an ADC input. A precision current reference provides excitation and an instrumentation amplifier scales the signal. The design also uses a three wire RTD configuration to minimize errors due to wiring resistance.

  •  Converts RTD resistance to voltage
  •  0 to 5V output across temperature range
  •  Eliminates lead resistance error
  •  Adjustable set with discrete resistors

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.


Detailed schematic diagram for design layout and components

TIDRF12.PDF (24 K)

Detailed schematic diagram for design layout and components

TIDRF13.PDF (203 K)

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


Includes TI products in the design and potential alternatives.

Current references

REF200Dual, 100-µA current source & sink

Data sheet document-pdfAcrobat PDF open-in-new HTML
Instrumentation amplifiers

INA326Precision, Low Drift, CMOS Instrumentation Amplifier

Data sheet document-pdfAcrobat PDF

Technical documentation

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Type Title Date
* User guide RTD to Voltage Using Instrumentation Amplifier Design Guide Apr. 28, 2015

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