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


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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TI Devices (5)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
ADS8681  16-Bit, 1-MSPS, 1-Ch SAR ADC with programmable (±12/±10/±6/±5/±2.5V) input ranges on +5V supply  Analog-to-digital converters (ADCs)  Sample & Buy View Design Kits & Evaluation Modules
ISO7640FM  Quad-channel, 4/0, 150-Mbps, default output low digital isolator  Isolation  Sample & Buy View Design Kits & Evaluation Modules
SN6501  Low-noise, 350-mA, 410-kHz transformer driver for isolated power supplies  Power for signal isolators  Sample & Buy View Design Kits & Evaluation Modules
SN74AUC17  6-ch, 0.8-V to 2.7-V high speed buffers with Schmitt-Trigger inputs  Buffer/driver  Sample & Buy View Design Kits & Evaluation Modules
TLV3012  Low-power comparator with reference (push-pull)  Amplifiers  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
ADS8681 Download
Download Download
ISO7640FM Download Download
SN6501 Download Download
SN74AUC17 Download Download
TLV3012 Download Download
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Technical documentation

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User guide (1)
Title Type Size (KB) Date
PDF 4826 01 Mar 2016
Design files (3)
Title Type Size (KB) Date
ZIP 1216 16 Mar 2016
PDF 99 16 Mar 2016
PDF 796 16 Mar 2016

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