Reference Design for 16-Bit High-Accuracy 4-20mA Input Isolated Analog Front End (AFE)

Manufactured By:Maxim Integrated
Reference Design for 16-Bit High-Accuracy 4-20mA Input Isolated Analog Front End (AFE) Reference Design for 16-Bit High-Accuracy 4-20mA Input Isolated Analog Front End (AFE)
Reference Design for 16-Bit High-Accuracy 4-20mA Input Isolated Analog Front End (AFE)
Reference Design for 16-Bit High-Accuracy 4-20mA Input Isolated Analog Front End (AFE)
Part Number:MAXREFDES4
In industrial control and industrial automation applications, high-resolution data converters are often required. Although today's field programmable gate arrays (FPGAs) and microcontrollers may integrate analog-to-digital converters (ADCs), in many cases, the resolution is not high enough and isolation is lacking. The Campbell (MAXREFDES4#) subsystem reference design is a 16-bit high-accuracy industrial analog front end (AFE) that accepts a 4–20mA current loop or a 0.2V to 4.096V voltage input signal, and features isolated power and data—all integrated into a small form factor.

The Campbell design integrates a precision low-noise buffer (MAX44250), a high-accuracy ADC (MAX11100), an ultra-high-precision 4.096V voltage reference (MAX6126), 600VRMS data isolation (MAX14850), and isolated/regulated 5V power rails (MAX256/MAX1659). This AFE solution can be used in any application that needs high-accuracy analog-to-digital conversion.

Applications:
  • Industrial sensors
  • Industrial automation
  • Process control
  • Programmable logic controllers (PLCs)
  • Medical applications.

Features

  • High accuracy
  • 4–20mA current loop input
  • 0.2V to 4.096V input range
  • Isolated power and data
  • Small printed circuit board (PCB) area
  • Device drivers
  • Example C source code
  • Pmod™-compatible form factor

Ships With

  • Board

Required Tools

Accessory Tools

Documents

Downloads

Simulation Model/CAD Models