Channel-to-channel isolated analog input module reference design


Design files


This reference design is a four channel-to-channel, isolated 4–20 mA, current-loop analog input module. The design includes a short circuit, overcurrent and overvoltage limit function for condition monitoring sensor and module applications. The major features of this analog input module design include channel isolation, a multi-channel analog input module powered up by a single flyback converter using LM5180, a power supply to 2-wire transmitter and short-circuit protection circuit. This design can also support a four-channel analog input module.

  • One to four channel-to-channel isolated analog input module
  • Supply for field transmitters with output power limitation (short limited to 25 mA)
  • Transmitter supply of 25 ±1V, IOUT < 25-mA peak
  • Input protected against miswiring
  • UART interface 24b ΔΣADC to reduce BOM size and cost
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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.

TIDUEN8.PDF (1054 K)

Reference design overview and verified performance test data


Detailed schematic diagram for design layout and components


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

TIDRZH3.PDF (1348 K)

Detailed overview of design layout for component placement

TIDRZH5.ZIP (3092 K)

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

TIDCFE9.ZIP (1559 K)

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

TIDRZH4.PDF (1366 K)

PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

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eFuses & hot swap controllers

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Technical documentation

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Type Title Date
* Design guide Channel-to-Channel Isolated Analog Input Module Reference Design Apr. 04, 2019
Product overview Isolated Power Topologies for PLC I/O Modules and Other Low-Power Applications PDF | HTML Nov. 09, 2022

Related design resources

Design tools & simulation

ANALOG-ENGINEER-CALC Analog engineer's calculator LM5180DESIGN-CALC LM5180 PSR flyback converter design tool

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