SLLA601 February   2023 ISOUSB211

 

  1.   Abstract
  2.   Trademarks
  3. 1Ground Loop Interference
    1. 1.1 Common Sources of Noise Coupling
  4. 2Why Isolation Helps
  5. 3Why ISOUSB211 Can Help
  6. 4EVM Setup and Noise Injection
  7. 5Summary
  8. 6References

5 Summary

The ISOUSB211 is a galvanically-isolated USB 2.0 compliant repeater that supports high-speed (480 Mbps) signaling rates intended for use as an isolator for USB peripherals and cables. Ground loops can cause signal interference and are common in applications where there are multiple devices, interconnected, and with common grounds. The difference in ground potentials is usually the result of supply current ripple or current draw from normal operation that creates a potential over the ground line’s limited impedance, causing local grounds to shift with respect to system ground. In audio, a ground loop can show up within the audible range as a persistent hum or hiss in the music. The ISOUSB211 USB isolator adds a level of robustness to your signal chain, in the event of ground loop interference while keeping your hardware USB 2.0 compliant.