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Original question:

[FAQ] PCM9211: Recommendation for ADC input connection when ADC is not used

PCM9211: Not using ADC.

Downey Kim
Expert 2675 points

Part Number: PCM9211
Other Parts Discussed in Thread: DIT4192, DIT4096

Hi TI experts,

The customer wants to convert I2S to SPDIF. So I recommended PCM9211.

Is there a simpler solution than PCM9211?

When I do not use the ADC function of PCM9211, is it necessary to supply VCCAD power?

Please check it.

Thanks

Downey Kim.

  • 0
    TI__Guru 64775 points

    Hi Downey,

    The PCM9211 works well and would have the flexibility of adding analog to S/PDIF and many other conversion options for future designs.

    A simpler solution would use the DIT4096 and DIT4192 devices which are specifically meant for Audio Serial Interface (I2S, LJ, RJ, etc.) to S/PDIF.

  • 0 in reply to Collin Wells
    Expert 2675 points

    Hi Collin,

    Thank you for your support. 

    Is it necessary to supply VDDAD power to PCM9211? They not use ADC function. 

    Thanks

    Downey Kim.

  • 0 in reply to Downey Kim
    TI__Guru 64775 points

    Hello,

    If the ADC is not used, then VCCAD does not need to be applied for normal operation of the other blocks.  This is covered in Section 8.3.8.1:

    If the onboard ADC is not used (such as when the application uses an external ADC) then no power supply is required for the VCCAD pin. This option means that a 5-V rail is not required when the internal ADC is not used. In such situations, VCCAD should be connected to AGND OR AGNDAD.