Low Cost Loop-Powered 4-20mA Transmitter EMC/EMI Tested Reference Design


Design files


This CerTIfied Reference Design is a low cost system that implements a 12-bit loop-powered, or 2-wire, transmitter using the DAC7311, OPA317, and TL431B. The design includes a protection circuit that provides immunity to the IEC61000-4 test suite. The design also includes a circuit to rectify a reverse polarity supply voltage. The protection circuit and rectifier do not negatively affect the current output performance, resulting in <0.2% total unadjusted error (TUE).

This design is well suited for industrial automation and process conrol applications requiring a low-cost solution for 2-wire data transmission.

  • 12-bit, loop-powered 4-20mA, transmitter
  • 10-36 V Loop Supply Voltage
  • <0.2% total unadjusted error (TUE)
  • <0.04% calibrated error
  • Low Cost Design
  • Verified to pass IEC61000-4-2/3/4/6 tests
  • Functional with reverse polarity supply connection
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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.

TIDC383A.ZIP (2604 K)

Detailed schematic diagram for design layout and components

TIDRB04.PDF (132 K)

Detailed schematic diagram for design layout and components

TIDRB05.PDF (79 K)

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


Includes TI products in the design and potential alternatives.

Precision DACs (≤10 MSPS)

DAC731112-bit, single-channel, ultra-low power DAC in 6-pin SC70 package for battery powered applications

Data sheet: PDF
Precision op amps (Vos<1mV)

OPA317Low Offset, Rail-to-Rail I/O Operational Amplifier

Data sheet: PDF | HTML
Shunt voltage references

TL431Adjustable precision shunt regulator

Data sheet: PDF | HTML

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Support software

TIPD158 Simulation — TIDC680.ZIP (642 K)

Technical documentation

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Type Title Date
* User guide Low-Cost Loop-Powered 4-mA to 20-mA Transmitter EMC/EMI Tested Design Guide Apr. 23, 2014
Technical article How to design fully isolated 4-wire sensor transmitters Oct. 21, 2015
Technical article How to design power-isolated 4-wire sensor transmitters Sep. 18, 2015
Technical article Designing output isolated 4-wire sensor transmitters Aug. 28, 2015
Technical article 2-wire 4-20mA sensor transmitters: Increasing Sensor Power with Switching Power Supplies (Part 6) Apr. 14, 2015

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