Bridge sensor signal conditioner with current loop output and EMC protection reference design


Design files


This bridge sensor conditioner module delivers a well-regulated current output to a ground-referenced load. The first stage uses a mixed-signal programmable gain amplifier (PGA) to provide linearization and temperature compensation to a differential bridge sensor voltage. The second stage converts the PGA output voltage into current and transmits the current over a standard 4mA to 20mA current loop. Additional circuitry protects the module against electrostatic discharge (ESD), electrical fast transients (EFT), radiated and conducted electromagnetic interference (EMI), and lightning surge.

  • EMC Tested According to IEC 61000-4 and FCC Standards
  • Digitally Calibrated 4-20mA Output
  • 0.1% Accuracy

This certified design includes:

  • Theory
  • Component Selection & Calculation
  • TINA-TI Simulation
  • Schematics and PCB Layout
  • Measurement Results
  • EMC Test Results
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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.

TIDR225.PDF (66 K)

Detailed schematic diagram for design layout and components

SLAC595.ZIP (1848 K)

Detailed schematic diagram for design layout and components

TIDR226.PDF (83 K)

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

TIDC171.ZIP (371 K)

Design file that contains information on physical board layer of design PCB


Includes TI products in the design and potential alternatives.

4-20mA signal conditioners

XTR117XTR117 4-20mA Current Loop Transmitter

Data sheet: PDF | HTML
Programmable & variable gain amplifiers (PGAs & VGAs)

PGA309PGA309 Voltage Output Programmable Sensor Conditioner

Data sheet: PDF

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Technical documentation

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Type Title Date
* User guide TIPD126 CerTIfied Design Reference Guide Jun. 18, 2013

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