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TLV320DAC3101EVM-U: Buffer for MCLK

Ryuuichi machida
Guru 11595 points
Part Number: TLV320DAC3101EVM-U
Other Parts Discussed in Thread: SN74LVC1G126

Hi,

I would like you to confirm about below.

* According to schematic of TLV320DAC3101EVM-U, buffer IC(SN74LVC1G126DBVR) is implemented b/w TAS1020B and DAC3101 on MCLK line.

  Could you please tell me why this device is implemented on MCLK line ?

  (It seems that there is no input requirement for MCLK in datasheet of DAC3101...)

Best Regards,

  • 0
    TI__Guru* 98235 points
    Hi Machida-san,

    The buffer implemented on these evaluation boards is not a requirement. Using a buffer is optional.
    I was not involved in the original release but I think this was used to be controlled by VREN pin from TAS1020B; you can see pin 42 from TAS1020B is connected to pin 1 (OE) from SN74LVC1G126.

    Best regards,
    -Ivan Salazar
    Audio Applications Engineer - Low Power Audio & Actuators
  • 0 in reply to Ivan Salazar
    Guru 11595 points
    Hi Ivan-san,

    I understood that you were not involved in the original release. So, if you can not find answer, it is ok.
    But if possible, could you please confirm about below ?

    * Can you guess the role of this buffer ?

    At first, I assumed that it is used to block MCLK until valid audio source is connected.
    However, when I confirmed behavior of "VREN", "VREN" signal was enabled regardless of the audio source connection.
    So, if you have any assumption or information, please share it...
    (Customer ask us meaning of this buffer.....)

    Best Regards,
  • 0 in reply to Ryuuichi machida
    TI__Guru* 98235 points
    Machida-san,

    Perhaps this was included for possible test with an external clock connected to the board. Or also test without MCLK (by selecting a different clock source, like BCLK).
    However I couldn't be sure about it as this is not documented.

    Best regards,
    -Ivan Salazar
    Applications Engineer - Low Power Audio & Actuators