Analog Linearized 3-Wire PT100 RTD to 2-Wire 4-20mA Current Loop Transmitter Reference Design


Design files


This design features a single-chip solution to linearize and transmit a 3-wire PT100 RTD over the industry standard 2-wire 4-20mA current loop.  The design was configured for a -200°C to 800°C  temperature range, but other temperature ranges can be achieved by adjusting the component values as discussed in the Theory of Operation section of the reference design guide.

  • Input:  3-Wire PT100 RTD
  • Temperature Range:  -200°C to 800°C
  • Output:  2-Wire 4-20mA Current Loop
  • Includes analog RTD sensor linearization for >40x linearity improvement over end-point fit
  • Reference design includes theory, calculated error analysis, component selection, PCB layout, and measured results.
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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.

TIDUAC6.PDF (1551 K)

Reference design overview and verified performance test data


Detailed schematic diagram for design layout and components


Detailed schematic diagram for design layout and components


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


Includes TI products in the design and potential alternatives.

4-20mA signal conditioners

XTR1054-20mA Current Transmitter with Sensor Excitation and Linearization

Data sheet: PDF

Technical documentation

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Type Title Date
* Design guide Analog Linearized 4-mA to 20-mA Current Loop Design Guide Jul. 23, 2015

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