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


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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TI Devices (1)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
XTR105  4-20mA Current Transmitter with Sensor Excitation and Linearization  Special function amplifiers  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
XTR105 Download Download
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User guide (1)
Title Type Size (KB) Date
PDF 1551 23 Jul 2015
Design files (3)
Title Type Size (KB) Date
PDF 193 19 Oct 2015
PDF 192 19 Oct 2015
ZIP 637 19 Oct 2015

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