4-20mA Current Loop Transmitter Reference Design


Design files


TIDA-00648 is an industry standard 4-20 mA current-loop transmitter. It allows injection of FSK-modulated digital data into the 4-20 mA current loop for HART communication. External protection circuitry is deployed in-place for compliance with regulatory IEC61000-4 standards such as EFT, ESD and surge requirements. EMC compliance to IEC61000-4 is necessary to ensure that the design not only survives but also performs as intended in the harsh/noisy industrial environment.

  • 4- to 20-mA current-loop output signal
  • 16-bit resolution
  • Loop-error detection and reporting
  • Programmable output-current error levels
  • Simple HART modulator interfacing
  • Designed to meet IEC 61000 requirements
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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.

TIDUAM6.PDF (1159 K)

Reference design overview and verified performance test data

TIDRH13.PDF (553 K)

Detailed schematic diagram for design layout and components

TIDRH14.PDF (113 K)

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

TIDRH15.PDF (205 K)

Detailed overview of design layout for component placement

TIDRH17.ZIP (865 K)

Files used for 3D models or 2D drawings of IC components


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

TIDRH16.PDF (1423 K)

PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

Precision DACs (≤10 MSPS)

DAC161S99716-Bit Precision DAC With Internal Reference and 4mA-to-20mA Current Loop Drive

Data sheet: PDF | HTML
Linear & low-dropout (LDO) regulators

TPS7A16100-mA, 60-V, ultra-low-IQ, low-dropout (LDO) voltage regulator with power good and enable

Data sheet: PDF | HTML
MSP430 microcontrollers

MSP430F517225 MHz MCU with 32KB Flash, 2KB SRAM, 10-bit ADC, comparator, DMA, 16-bit High Resolution timer

Data sheet: PDF | HTML

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Support software

TIDA-00648 Firmware — TIDCAX7.ZIP (118 K)

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Technical documentation

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Type Title Date
* Design guide 4-mA to 20-mA Current Loop Transmitter Design Guide Sep. 17, 2015

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