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TPA5050/TPA5051 Behavior When It Does Not Supply Clocks

Hi,

We have obtained a question from our customers.
When the supply of BCLK and LRCLK is cut off, how does these devices behave?
Could you please advise us about it?

Best Regards,
Kato

  • Hi Kato-san,

    If the supplies of BCLK and LRCLK are cut off, the delay will not be active and the data-out will follow the data-in (no delay).

    Regards,

    ~John

  • Hi John-san,

    Thank you for your reply quickly.
    If we modify default settings to other settings for audio delay registers by using I2C interface, supply the BCLK, LRCLK and Data,
    we believe that the signal which delayed depending on register settings is output from the DATA_OUT terminal.
    Then, if the supplies of BCLK and LRCLK are cut off, does the output mode become the rhrough mode automatically?
    This means that audio delay registers becomes all zero data.
    Is it correct?

    Moreover, which clock do these deivces operate as the master clock?
    We believe that the master clock is BCLK.
    Could you please advise us?

    Best Regards,
    Kato

  • Hi Kato-san,

    The delayed signal will come out of the DATA_OUT terminal, that is correct. If the clock supplies are cut off, there is no longer a way for the device to count how many bits to delay. This results in the DATA_OUT having no delay from the input DATA pin.

    As long as power is still on the device, the registers set by I2C should not clear when removing the clock lines.

    These devices do not have a system/master clock and operate on the BCLK/LRCLK.

    Regards,

    ~John

  • Hi John-san,

    Thank you for your cooperation.
    We understood your information, had one more question.
    Because these devices have the delay memory, operate on the BCLK and LRCLK, do not have internal PLL.
    Is it correct?

    Best Regards,
    Kato

  • Kato-san,

    You are correct.

    -d2

  • Hi, Don-san,

    Thank you for your cooperation.
    We understood it.
    Thank you so much.

    Best Regards,
    Kato