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TIPD158

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

Design files

TIPD158

Design files

Overview

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.

Features
  • 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.

download Schematic — TIPD158
TIDC383A.ZIP (2604 K)

Detailed schematic diagram for design layout and components

download Schematic — TIPD158
TIDRB04.PDF (132 K)

Detailed schematic diagram for design layout and components

download Bill of materials (BOM) — TIPD158
TIDRB05.PDF (79 K)

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

Products

Includes TI products in the design and potential alternatives.

Precision DACs (≤10 MSPS)

DAC7311 — 12-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)

OPA317 — Low Offset, Rail-to-Rail I/O Operational Amplifier

Data sheet: PDF | HTML
Shunt voltage references

TL431 — Adjustable precision shunt regulator

Data sheet: PDF | HTML

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Software

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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