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


Design files


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.

  • 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
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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

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TIDUBJ1.PDF (4826 K)

Reference design overview and verified performance test data


Detailed schematic diagram for design layout and components


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


Includes TI products in the design and potential alternatives.

Precision ADCs

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

Data sheet: PDF | HTML

TLV3012Low-power comparator with reference (push-pull)

Data sheet: PDF | HTML
Digital isolators

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

Data sheet: PDF | HTML
Noninverting buffers & drivers

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

Data sheet: PDF
Transformer drivers

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

Data sheet: PDF | HTML

Technical documentation

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

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