SLLA284G July   2022  – September 2023 ISO5451 , ISO5452 , ISO5851 , ISO5852S , ISO7142CC , ISO7142CC-Q1 , ISO721 , ISO721-Q1 , ISO721M , ISO721M-EP , ISO722 , ISO7220A , ISO7220M , ISO7221A , ISO7221B , ISO7221C , ISO7221M , ISO722M , ISO7230C , ISO7230M , ISO7231C , ISO7231M , ISO7240C , ISO7240CF , ISO7240M , ISO7241C , ISO7241M , 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.   1
  2.   Digital Isolator Design Guide
  3.   Trademarks
  4. 1Operating Principle
    1. 1.1 Edge-Based Communication
    2. 1.2 On-Off Keying (OOK) Based Communication
  5. 2Typical Applications for Digital Isolators and Isolated Functions
  6. 3Digital Isolator Selection Guide
    1. 3.1 Parameters of Interest
    2. 3.2 Isolator Families
  7. 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
  8. 5Summary
  9. 6References
  10. 7Revision History

Abstract

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 portfolio includes the ISO78xx family of 5.7-kVrms reinforced digital isolators, the ISO67xx and ISO77xx family of 5-kVrms digital isolators, the ISO73xx family of 3-kVrms digital isolators, and the ISO71xx family of 2.5-kVrms digital isolators, among others. This document explains the basic operating principle of an isolator, suggests where to place it within a system design, and recommends guidelines for an electromagnetic compatible (EMC) circuit-board design. When looking for a reliable and robust upgrade to your optocoupler designs, consider TI's pin-to-pin opto-emulator products.

Further information is available in the respective product data sheets and the EVM manuals.