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PCM9211EVM-U: Register Configuration

Art Mecina
Genius 16665 points
Part Number: PCM9211EVM-U
Other Parts Discussed in Thread: PCM9211

Hello Guys,

Good day.

Our customer is having issues configuring his PCM9211 chip to handle 192 kHz audio. He has a 24.576 MHz external resonator connected to the XTI and XTO pins exactly the same as the development board but even on the development board he cannot seem to configure the registers appropriately to get PCM9211 to lock on to the 192 kHz audio. Sometimes the 39h register will detect the incoming biphase signal as 192 kHz but it will also show that the signal is still being calculated/unlocked and the PCM error light will remain on unlike when he pass a 48 or 96 kHz signal.

Do you have a register configuration that works given a 192 kHz input signal?

Thanks in advance!

Art

  • 0
    TI__Mastermind 23050 points

    Hi Art,

    What input is the signal being applied on? In general I would also recommend using direct I2C writes to the PCM9211 rather than the GUI interface as there are some known issues where the correct register settings are not written by the GUI.

    Best,

    Zak

  • 0 in reply to Zak Kaye
    TI__Genius 16665 points

    Hello Zak,

    The input that the signal is applied to is a TOSLINK optical receiver. He has the evaluation board and a custom PCB and he is using I2C to read/write to the registers. He is not using the GUI at all.

    Thanks!

    Art

  • 0 in reply to Art Mecina
    TI__Mastermind 23050 points

    Hi Art,

    Sorry for the delay but I was out of office for the holidays. I think the issue is most likely with the optical receivers. 192kHz S/PDIF means the biphase clock runs at 192khz*2channels*32bit*2 = 24.576MHz, which is faster than most standard optical receivers are rated for. You could confirm this by testing with coax instead. 

    There are of course higher quality TOSLINK connectors that support higher sample rates but we don't generally use these on EVMs.

    Best,

    Zak