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Application NoteNxp

Four-channel universal input solution with NAFE13388 family of devices

Application note for designing a four-channel universal-input system using NAFE13388 AI-AFEs, supporting RTD, thermocouple, voltage, current, and Wheatstone bridge sensors.

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Overview

This application note provides a design guide for a four-channel, software-configurable universal-input system based on the NAFE13388 family of industrial-grade analog front-ends (AI-AFE). It details how to configure the NAFE13188 variant to measure diverse industrial transducers including ±10 V voltage, 4-20 mA current loops, 2/3/4-wire RTDs, thermocouples with cold junction compensation, and Wheatstone bridges. The document describes the device's architecture, including its 24-bit sigma-delta ADC, programmable gain amplifier (PGA), integrated excitation sources, and internal sequencer that allows for seamless switching between 16 logical channel configurations. It also includes application schematics and pin-mapping for various transducer types.

Use Cases

  • Industrial data acquisition systems
  • Programmable Logic Controllers (PLC)
  • Remote Terminal Units (RTU)
  • Multichannel sensor interfaces
  • Process control instrumentation

Topics

NAFE13388
NAFE13188
NAFE73388
NAFE13144
AI-AFE
Analog Front-End
Universal Input
RTD
Thermocouple
24-bit ADC
PGA
Wheatstone bridge

Referenced Parts

NAFE13188

NXP

The NAFE13188, which is the part used in this report, is a 288 kSPS, eight-input, 24-bit ADC version.

NAFE13388

NXP

four-channel, universal-input system using the NAFE13388/NAFE73388 (NAFEx3388) family of devices

NAFE73388

NXP

Other version includes NAFE73388, which features a data rate up to 576 kSPS

NAFE13144

NXP

or the NAFE13144, which is a four-input version.

Four-channel universal input solution with NAFE13388 family of devices | Design Resources