SBAA548A April   2022  – May 2022 ADS8588S , ADS8681 , ADS8686S , ADS8688 , ADS8688A

 

  1.   Abstract
  2.   Trademarks
  3. 1Introduction
  4. 2Circuit Design and Test System
    1. 2.1 Design Description
      1. 2.1.1 Input Protection
      2. 2.1.2 Power Supply Design and Protection
      3. 2.1.3 Digital Isolation Design
      4. 2.1.4 Component Selection and Layout Considerations
    2. 2.2 Test System
      1. 2.2.1 Reference
    3. 2.3 Standards and Test Criteria
  5. 3Test Details and Results
    1. 3.1 Electrical Fast Transients (EFT)
    2. 3.2 Electrostatic Discharge (ESD)
    3. 3.3 Surge Immunity (SI)
    4. 3.4 Conducted Immunity (CI)
    5. 3.5 Radiated Immunity (RI)
    6. 3.6 Radiated Emissions (RE)
      1.      20
  6. 4Schematics
  7. 5PCB Layouts
  8. 6Bill of Materials
  9. 7Acknowledgments
  10. 8References
  11. 9Revision History

2.1 Design Description

This circuit is designed with 16 analog input channels, isolated power supplies, and an isolated digital serial peripheral interface (SPI) that interfaces with a precision host interface (PHI) controller card for monitoring conversion data from the ADS8686S. The printed circuit board (PCB) layout is designed to satisfy the IEC 61000-4-x and CISPR 11 standards for working in a harsh electromagnetic environment. An external protection circuitry is designed on each analog input to protect the ADS8686S from electrical overstress (EOS) failure, and also surge (IEC61000-4-5), electrostatic discharge (ESD) (IEC61000-4-2), electrical fast transient (EFT) (IEC61000-4-4) transient signals.