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PCM9211: About S/PDIF input

Ryu Yamashita
Genius 3020 points
Part Number: PCM9211

Tool/software:

Hi team,

I have S/PDIF input to RXIN0 and unintentionally had an inverter circuit in between.
It just seems to work fine, but if I invert the S/PDIF, will RXIN0 still recognize it without any problem?

Best Regards,
Ryu.

  • +1
    TI__Mastermind 26671 points

    Hi Ryu,

    My guess is that the device still will recognize it input as "valid data"  but not necessarily the correct data or the S/PDIF that you are sending;  

    Thus  while you get an output,  it might not be  what you expect. If you look at S/PDIF control word components, Sampling frequency is coded as  0000 for  44.1 kHz, 0100 for 48 kHz, 1100 for  32 kHz in b0-b3 so by inverting it , you would have a different fs ( for example 1111 which is the inverted of 0000 is not even in the list). 

    I would confirm the result is correct by sending a sinewave and analyzing the output. 

    Regards,

    Arash

  • 0 in reply to Arash Loloee
    Genius 3020 points

    Hi Arash,

    Thank you for your response.
    It works fine for normal songs as well as sine waves.
    Therefore, I thought that inverting it would not be a problem.

    Best Regards,
    Ryu.

  • +1 in reply to Ryu Yamashita
    TI__Mastermind 26671 points

    Hi Ryu, thanks for confirming it works fine with inverted signal. If it works both for songs and sinewave, then it is ok .  Thanks for sharing.

    Regards,

    Arash