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PCM5122: BCLK GPIO Output

Kuramochi Tadahiko
Guru 28715 points
Part Number: PCM5122


Hi,

There is "010: BCK (256FS)" on the following list.

Is this "BCK(256fs)" a raw BCK signal or a pseudo-BCLK generated from 256FS?

Best Regards,

Kuramochi

  • 0
    TI__Guru 54903 points

    Hi Kuramochi-san,

    The mode takes the output of the internal interpolation filter.  As the internal digital filter operations at 384ksps, the FS, in this case, is 48kHz.  The output format is the same as the DF1701 family of devices.  This mode has limited customer applications - may I ask what you are trying to use it for?

    Thanks,

    Paul

  • 0 in reply to Paul_Frost
    Guru 28715 points

    Hello Paul-san,

    Thank you for your help.

    My customer is considering using multiple PCM5122s and connecting digital audio signals by the daisy-chain.

    This is related to the following thread;

    We would like to know that this "BCL(256fs)" can be used as this signal.

    We think that we can use "BCLK(256fs)" if it is the raw BCLK signal.

    On the other hand, we can not use it if it is pseudo-signal.

    Does your reply mean that it is pseudo-signal?

    Best Regards,

    Kuramochi

    "BCL(256fs)"

  • 0 in reply to Kuramochi Tadahiko
    TI__Guru 54903 points

    The BCLK(256FS) will not be the raw BCLK that is being applied to the device.  This BCK will be approximately 12.288MHz, as the frequency is to support the DF1701 filter mode (384ksps*32bits).

    I do not recommend using this for a "daisy-chain" mode. 

    Thanks,

    Paul