SLLA284F July   2022  – July 2022 ISO5451 , ISO5452 , ISO5851 , ISO5852S , ISO7142CC , ISO7142CC-Q1 , ISO721 , ISO721-Q1 , ISO721M , ISO721M-EP , ISO722 , ISO7220A , ISO7220M , ISO7221A , ISO7221B , ISO7221C , ISO7221M , ISO722M , ISO7230A , ISO7230C , ISO7230M , ISO7231A , ISO7231C , ISO7231M , ISO7240A , ISO7240C , ISO7240CF , ISO7240M , ISO7241A , ISO7241C , ISO7241M , ISO7242A , ISO7242C , ISO7242M , ISO7310-Q1 , ISO7310C , ISO7340-Q1 , ISO7340C , ISO7340FC , ISO7341-Q1 , ISO7341C , ISO7341FC , ISO7342-Q1 , ISO7342C , ISO7342FC , ISO7740 , ISO7741 , ISO7742 , ISO7760 , ISO7761 , ISO7762 , ISO7810 , ISO7820 , ISO7821 , ISO7830 , ISO7831 , ISO7840 , ISO7841 , ISO7842

 

  1.   Digital Isolator Design Guide
  2.   Trademarks
  3. 1Operating Principle
    1. 1.1 Edge-Based Communication
    2. 1.2 On-Off Keying (OOK) Based Communication
  4. 2Typical Applications for Digital Isolators and Isolated Functions
  5. 3Digital Isolator Selection Guide
    1. 3.1 Parameters of Interest
    2. 3.2 Isolator Families
  6. 4PCB Design Guidelines
    1. 4.1 PCB Material
    2. 4.2 Layer Stack
    3. 4.3 Creepage Distance
    4. 4.4 Controlled Impedance Transmission Lines
    5. 4.5 Reference Planes
    6. 4.6 Routing
    7. 4.7 Vias
    8. 4.8 Decoupling Capacitors
  7. 5Summary
  8. 6References
  9. 7Revision History

Summary

This design guide helps system designers of galvanically isolated systems to begin designing with TI's broad portfolio of digital isolators and isolated functions in the shortest time possible. This document explains the basic operating principle of an isolator, suggests where to place it within a system design, and recommends guidelines for an EMC-compatible circuit-board design. Despite the enormous amount of technical literature, seminars, newsletters, and internet forums on PCB design, this document provides designers with layout guidelines in a comprehensive way. By following the recommendations presented herein, designers can accomplish EMC-compliant board design in the shortest time possible.

Read our blog, Robust isolators prevent you from saying “I see dead circuits!”