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TIDA-010982

Field transmitter platform, 4mA to 20mA loop-powered interface reference design

Design files

TIDA-010982

Design files

Overview

This reference design gives an example implementation of a 4–20mA interface for 2-wire loop-powered sensors. The design enables evaluation of the AFE881H1 and AFE882H1 in a lower power application-like environment with a 1.8V signal chain. The AFE881H1 and AFE882H1 integrate a high-precision 16-bit digital-to-analog converter (DAC) and a HART® modem. The reference design provides a serial peripheral interface (SPI) and universal asynchronous receiver-transmitter (UART) interface on a pin header to connect to a microcontroller (MCU). This pin header provides 3.3V and 1.8V to power a MCU and a 1.25V reference voltage to be used for an analog-to-digital converter (ADC).

Features
  • Implementation of 4–20mA loop interface for 2-wire loop-powered sensor
  • Complete 1.8V signal chain allows low power consumption and maintains high accuracy
  • AFE88xH1 16-bit DAC with integrated reference and HART modem
  • MCU interface providing power output (1.8V, 3.3V, 1.25V reference voltage), SPI and UART interface
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Design files & products

Design files

Download ready-to-use system files to speed your design process.

download Design guide — TIDA-010982
PDF | HTML
TIDUFE3A.PDF (4055 KB)

Reference design overview and verified performance test data

download Assembly drawing — TIDA-010982
SLVRBT5.ZIP (429 KB)

Detailed overview of design layout for component placement

download Bill of materials (BOM) — TIDA-010982
SLVRBT4.ZIP (305 KB)

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

download CAD/CAE symbol — TIDA-010982
SLVRBT7.ZIP (6845 KB)

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

download Gerber file — TIDA-010982
SLVC884.ZIP (1282 KB)

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

download PCB layout — TIDA-010982
SLVRBT6.PDF (890 KB)

PCB layer plot file used for generating PCB design layout

download Schematic — TIDA-010982
SLVRBT3.ZIP (954 KB)

Detailed schematic diagram for design layout and components

Products

Includes TI products in the design and potential alternatives.

Precision DACs (≤10 MSPS)

AFE881H1 — 16-bit low-power analog front end (AFE) with DAC, ADC and HART® modem for sensor transmitters

Data sheet: PDF | HTML
Precision DACs (≤10 MSPS)

AFE882H1 — Low-power AFE with HART ®, 16-bit DAC, 12-bit ADC for PLC and sensor transmitter applications

Data sheet: PDF | HTML
Series voltage references

REF35 — 650-nA quiescent current, 12-ppm/°C drift, ultra-low-power precision voltage reference

Data sheet: PDF | HTML
TVS diodes

TVS3301 — 33 V Bidirectional Flat-Clamp surge protection device

Data sheet: PDF | HTML
Analog & precision switches & muxes

TMUX1219 — 5V, 2:1 (SPDT), 1-channel, analog switch, 1.8V compatible logic

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

TPS7A03 — Nanopower-IQ 200nA 200mA low-dropout (LDO) voltage regulator with fast transient response

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

OPA391 — Micropower, single, high-precision low-bias-current RRIO op amp with high speed-to-power ratio

Data sheet: PDF | HTML
Voltage translating flip-flops, latches & registers

SN74LV8T165 — 1.65-V to 5.5-V 8-bit parallel-load shift register with voltage translation

Data sheet: PDF | HTML

Start development

Hardware development

Evaluation board

SNSR-DUAL-ADC-EVM — ADS122S14 and MSPM0G1507 evaluation module

This reference design gives an example implementation of a 4–20mA interface for 2-wire loop-powered sensors. The design enables evaluation of the AFE881H1 and AFE882H1 in a lower power application-like environment with a 1.8V signal chain. The AFE881H1 and AFE882H1 integrate a high-precision (...)
EVM user’s guide: PDF | HTML
Supported products & hardware

Supported products & hardware

Hardware development
Reference design
TIDA-010982 — Field transmitter platform, 4mA to 20mA loop-powered interface reference design
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SNSR-DUAL-ADC-EVM — ADS122S14 and MSPM0G1507 evaluation module

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Hardware development
Reference design
TIDA-010982 — Field transmitter platform, 4mA to 20mA loop-powered interface reference design
TI’s Standard Terms and Conditions for Evaluation Items apply.

Software development

Firmware

SNSR-DUAL-ADC-EVM-FW — SNSR-DUAL-ADC-EVM Firmware source code

Supported products & hardware

Supported products & hardware

Hardware development
Reference design
TIDA-010982 — Field transmitter platform, 4mA to 20mA loop-powered interface reference design
Evaluation board
SNSR-DUAL-ADC-EVM — ADS122S14 and MSPM0G1507 evaluation module

SNSR-DUAL-ADC-EVM-FW — SNSR-DUAL-ADC-EVM Firmware source code

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Latest version
Version: 1.0.0
Release date: Jan 21, 2026
open-in-new

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Hardware development
Reference design
TIDA-010982 — Field transmitter platform, 4mA to 20mA loop-powered interface reference design
Evaluation board
SNSR-DUAL-ADC-EVM — ADS122S14 and MSPM0G1507 evaluation module

Release Information

Initial Release

Technical documentation

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* Design guide Field Transmitter Platform: 4mA to 20mA Loop-Powered Interface Reference Design (Rev. A) PDF | HTML Jan 12, 2026

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