TIPD202

Analog Linearized 3-Wire PT1000 RTD to 2-Wire 4-20mA Current Loop Transmitter Reference Design

TIPD202

Design files

Overview

This design features a single-chip solution to linearize and transmit a 3-wire PT1000 RTD over the industry standard 2-wire 4-20mA current loop.  The design was configured for a -50°C to 250°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.  Unadjusted design accuracy was measured to be less than 0.15°C over the selected RTD temperature span.

Features
  • Input:  3-Wire PT1000 RTD
  • RTD Temperature Range:  -50°C to 250°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

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.

TIDUB11.PDF (997 K)

Reference design overview and verified performance test data

TIDCBH5.ZIP (1130 K)

Detailed schematic diagram for design layout and components

TIDRJ17.PDF (210 K)

Detailed schematic diagram for design layout and components

TIDRJ18A.PDF (300 K)

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

Products

Includes TI products in the design and potential alternatives.

4-20mA signal conditioners

XTR1124-20mA Current Transmitters with Sensor Excitation (2 x 250-µA) and Linearization ;

Data sheet document-pdfAcrobat PDF

Technical documentation

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Type Title Date
* Design guide Analog 3-Wire PT1000 RTD to 2-Wire 4-20mA Current Loop Transmitter Design Guide Nov. 09, 2015

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