TIPD151

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

TIPD151

Design files

Overview

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.

Features
  • 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

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

Products

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 document-pdfAcrobat PDF open-in-new HTML
Analog switches & muxes

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

Data sheet document-pdfAcrobat PDF open-in-new HTML
Precision ADCs (<=10MSPS)

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

Data sheet document-pdfAcrobat PDF open-in-new HTML
Precision op amps (Vos<1mV)

OPA140Single, 11-MHz, single supply, low-noise, precision, rail-to-rail output, JFET amplifier

Data sheet document-pdfAcrobat PDF open-in-new HTML
Precision op amps (Vos<1mV)

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

Data sheet document-pdfAcrobat PDF open-in-new HTML
Series voltage references

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

Data sheet document-pdfAcrobat PDF
Series voltage references

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

Data sheet document-pdfAcrobat PDF open-in-new HTML

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Software

Support software

TIPD151 Simulation – TIDC244.ZIP (75 K)

Technical documentation

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Type Title Date
* User guide 16-Bit 400-kSPS Four-Channel MUX Data Acquisition System Reference Guide (Rev. B) Mar. 29, 2016
Technical article Does a low-leakage multiplexer really matter in a high-impedance PLC system? Feb. 19, 2016

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