16-bit 400KSPS 4-Ch. Multiplexed Data Acquisition Ref Design for High Voltage Inputs, Low Distortion


Design files


This TI Verified Design implements a 16-bit, differential 4-channel multiplexed data acquisition system at 400KSPS throughput for high voltage differential input of ±20 V (40 Vpk-pk) industrial applications. The circuit is realized with a 16-bit successive-approximation-resistor (SAR) analog-to-digital converter (ADC), a precision high voltage signal conditioning front end, and a 4-channel differential multiplexer (MUX). The design details the process for optimizing the precision high voltage front end drive circuit using the OPA192 and OPA140 to achieve excellent dynamic performance with the ADS8864.

  • 4-Channel, High-Voltage (±20 V), Multiplexed, Data Acquisition System
  • 400 KSPS (100KSPS/Channel) Sampling Rate
  • ±1LSB INL
  • 16 Bit, Full Scale, Channel-to-Channel Settling
  • 14.2 Bits ENOB
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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.

TIDR348A.PDF (154 K)

Detailed schematic diagram for design layout and components

TIDC201.ZIP (584 K)

Detailed schematic diagram for design layout and components

TIDR349B.PDF (120 K)

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

TIDC243.ZIP (476 K)

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


Includes TI products in the design and potential alternatives.

Analog switches & muxes

MUX36D041-pA on-state leakage current, 36-V, 4:1, 2-channel precision analog multiplexer

Data sheet: PDF | HTML
Analog switches & muxes

MUX36S081-pA on-state leakage current, 36-V, 8:1, 1-channel precision analog multiplexer

Data sheet: PDF | HTML
Precision ADCs

ADS886416-Bit, 400-kSPS, 1-Ch SAR ADC with Single-Ended Input, SPI Interface and Daisy-Chain

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

OPA140Single-channel, 11-MHz, low-noise 36-V JFET precision operational amplifier with rail-to-rail output

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

OPA350Single, single-supply, rail-to-rail, high speed, low noise operational amplifier

Data sheet: PDF | HTML
Series voltage references

REF32404.096-V 4-ppm/°C, 100-µA 6-pin SOT-23 series (bandgap) voltage reference

Data sheet: PDF
Series voltage references

REF60414.096-V, 5-ppm/°C high-precision voltage reference with integrated buffer & enable pin

Data sheet: PDF | HTML

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Support software

TIDC244 TIPD151 Simulation

Technical documentation

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* User guide 16-Bit 400-kSPS Four-Channel MUX Data Acquisition System Reference Guide (Rev. B) Mar. 29, 2016

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