TIDA-00106

16-Bit 1-MSPS Data Acquisition Reference Design, Isolated for High-Voltage Common-Mode Rejection

TIDA-00106

Design files

Overview

The circuit represents a high-performance data acquisition (DAQ) solution suitable for processing input signals (up to ±12 V) superimposed on large common-mode offsets (tested up to 155 Vp-p from dc to approximately 15 kHz) relative to the ground potential of the system's main power supply. Common-mode rejection is achieved by generating an isolated power supply to allow the analog signal chain to float with the input common-mode signal. The analog signal chain consists of a high-performance, 16-bit, 1-MSPS SAR ADC with an integrated analog front end (AFE) that offers high input impedance and a wide ±12-V input voltage range. Relevant application areas include PLC analog input modules with channel-to-channel isolation, automotive battery pack monitoring, power monitoring in AC motor drives and thermocouple measurements.

Features
  • Provides 16-bit, 1-MSPS, 120-dB CMRR, 108-dB THD, performance via Isolation
  • Isolated data acquisition to allow for high-voltage common-mode rejection
  • Isolated power supply design
  • Design facilitates injecting high common-mode voltages for testing

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.

TIDUBJ1.PDF (4826 K)

Reference design overview and verified performance test data

TIDRKS6.PDF (796 K)

Detailed schematic diagram for design layout and components

TIDRKS7.PDF (99 K)

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

TIDCBX6.ZIP (1216 K)

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

Products

Includes TI products in the design and potential alternatives.

Precision ADCs (<=10MSPS)

ADS868116-Bit, 1-MSPS, 1-Ch SAR ADC with programmable (±12/±10/±6/±5/±2.5V) input ranges on +5V supply

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

TLV3012Low-power comparator with reference (push-pull)

Data sheet document-pdfAcrobat PDF
Digital isolators

ISO7640FMQuad-channel, 4/0, 150-Mbps, default output low digital isolator

Data sheet document-pdfAcrobat PDF open-in-new HTML
Noninverting buffers & drivers

SN74AUC176-ch, 0.8-V to 2.7-V high speed buffers with Schmitt-Trigger inputs

Data sheet document-pdfAcrobat PDF
Transformer drivers

SN6501Low-noise, 350-mA, 410-kHz transformer driver for isolated power supplies

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

Technical documentation

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* Design guide Data Acquisition System for High-Voltage Common Mode Rejection Design Guide Mar. 01, 2016

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