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TIPD151

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

Design files

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
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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.

download Schematic — TIPD151
TIDR348A.PDF (154 K)

Detailed schematic diagram for design layout and components

download Schematic — TIPD151
TIDC201.ZIP (584 K)

Detailed schematic diagram for design layout and components

download Bill of materials (BOM) — TIPD151
TIDR349B.PDF (120 K)

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

download Gerber file — TIPD151
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

MUX36D04 — 1-pA on-state leakage current, 36-V, 4:1, 2-channel precision analog multiplexer

Data sheet: PDF | HTML
Analog switches & muxes

MUX36S08 — 1-pA on-state leakage current, 36-V, 8:1, 1-channel precision analog multiplexer

Data sheet: PDF | HTML
Precision ADCs

ADS8864 — 16-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)

OPA140 — Single-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)

OPA350 — Single, single-supply, rail-to-rail, high speed, low noise operational amplifier

Data sheet: PDF | HTML
Series voltage references

REF3240 — 4.096-V 4-ppm/°C, 100-µA 6-pin SOT-23 series (bandgap) voltage reference

Data sheet: PDF
Series voltage references

REF6041 — 4.096-V, 5-ppm/°C high-precision voltage reference with integrated buffer & enable pin

Data sheet: PDF | HTML

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Software

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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