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ISOUSB211: Audio isolation

Chang YATING
Prodigy 20 points

Part Number: ISOUSB211

Tool/software:

In the Application Note- USB Audio Isolation with Isolated USB 2.0 Redriver

https://www.ti.com/lit/an/slla601/slla601.pdf?ts=1723650485763&ref_url=https%253A%252F%252Fwww.ti.com%252Fproduct%252FISOUSB211

About the isolation audio circuit shows as the right image in Figure 2-1, I want to know if the grounds at both ends need to be connected together externally to form a loop after being isolated?

For example, they are connected through the outer metal shell? If a loop is not formed, will the audio not be output?

Thanks

  • 0
    TI__Genius 15460 points

    Hi Chang,

    Thank You for reaching out. Glad to see this ISOUSB application note coming to use for your application of interest. Now coming to your question:

    NO, the 2 isolated grounds need not be connected in any way for the successful operation of USB Peripheral Audio Output. Please refer Figure 3-2 from the same document below:

    Moreover, If you connect the 2 grounds in any way, like outer metal shell, then it will nullify the advantage of using the ISOUSB in this application as it creates a Ground Loop path again.

    Hope this helps your application use case.

    Regards
    Varun