Loop-powered 4-mA to 20-mA transmitter EMC and EMI-tested reference design


Design files


This certified reference design implements a 12-bit loop-powered, or 2-wire, transmitter using 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 applicable for industrial automation and process control applications requiring a low-cost solution for two-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 | HTML
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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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

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