Single Supply Analog Input Module Reference Design with 16-Bit, 8-Channel ADC for PLC


Design files


This design is for a 16-bit, 8-channel analog input module for industrial programmable logic controller (PLC) systems. The circuit is realized with an 8-channel, 16-bit, successive-approximation-register (SAR), analog-to-digital converter (ADC) with an integrated precision reference and analog front-end (AFE) circuit.

  • Voltage Input Range : +/- 10V, 0-10V, +/-5V, 0-5V
  • Current Input Range : +/- 20mA, 0-20mA, 4-20mA
  • 4 wire RTD Temperature Range : -40 to 160 °C
  • Single Supply operation
  • Overall Accuracy achieved: 0.1 % for voltage and current inputs & 0.25% for temperature input
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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.

TIDRF25.PDF (671 K)

Detailed schematic diagram for design layout and components

TIDRF26.PDF (165 K)

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

TIDCAE3.ZIP (2591 K)

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


Includes TI products in the design and potential alternatives.

Instrumentation amplifiers

INA333Low-Power, Zero-Drift, Precision Instrumentation Amplifier

Data sheet: PDF | HTML
Precision ADCs (<=10MSPS)

ADS868816-bit, 500-kSPS, 8-channel, single-supply SAR ADC with bipolar input ranges

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

OPA320Precision, zero-crossover, 20-MHz, 0.9-pA Ib, RRIO, CMOS operational amplifier

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

OPA376Precision (0.025mV), low noise (7.5nV/rtHz), low quiescent current (760uA) op amp

Data sheet: PDF | HTML

Technical documentation

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Type Title Date
* User guide Single-Supply Analog Input Module With 16-Bit 8-Channel ADC for PLC Design Guide (Rev. A) Jul. 10, 2015

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