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PCM5102A: mute, un-mute finction

Toshiro Imi
Expert 7170 points
Part Number: PCM5102A

Tool/software:

Hello,

Ever since our customer studies PCM5102A, he has some questions about mute, un-mute in below/

1)  Does un-mute function start only when XSMT=Lo to Hi and BCK/LRCK clock in, that means un-mute function does not started as long as BCK/LRCK is not applied even though XSMT=Lo to Hi.

2) When PCM5102A recovers from mute to un-mute by zero data detection, does PCM5102A return to un-mute quickly or return to un-mute via soft un-mute function (recovering to 0dbFS by 104 samples.

Best regards,

T.Imi

  • 0
    TI__Mastermind 30261 points

    Hello,

    The XSMT (external soft mute) is a mechanism to slowly mute the part to help avoid pops in the audio. 

    when you want to mute using soft mute by inserting the SOFT MUTE ( while clks are present) , it takes about 104 cycles to   fully attenuate the data. But when there is no clock ( or any clock error happens), the  device switches to an internal oscillator and continue to the drive the DAC output, while it starts to attenuate the data from its last known value and then hard mute the output to ground. 

    For zero data detection , once it detects zero data  it uses analog mute (for a programmed given number of cycles) and  when it recovers from zero detect it just unmutes the output.

    Regards,

    Arash

  • 0 in reply to Arash Loloee
    TI__Expert 7170 points

    Hello, 

    Thank you for your answer. Let me recap your answers below.

    1) PCM5102A outputs hard mute even if XSMUT=Hi and no BCK/LRCK, becuase internal oscillator makes hard mute, described in "Clock Error Detect" in the datasheet.

    2) Soft un-mute does not work but un-mute quickly when PCM5102A recovers from zero data detect to non zero data.

    Please let me know, if my understanding is incorrect.

    Best regards,

  • 0 in reply to Toshiro Imi
    TI__Mastermind 30261 points

    Hello, 

    1) the soft mute activates automatically but uses internal oscillator to attenuate the output  and then it is hard muted at the end.

    2)  Yes, it unmutes quickly

    Regards,

    Arash