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Micronas DAC3550A - interesting noise problem

Discussion in 'Electronic Design' started by Peter Neal, May 25, 2004.

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  1. Peter Neal

    Peter Neal Guest


    I'm using a Micronas DAC3550A (built around the reference design at the back
    of the data sheet) and I have an interesting problem.

    If I play audio to the left channel only I get crystal clear sound output on
    the left channel and seemingly random high frequency noise of about 1v
    peak-peak on the right. If play audio to the right only, the situation is
    reversed and I get crystal clear sound from the right channel and 1v
    peak-peak noise on the left.

    If I play audio to both channels I simply get noise on both channels, again
    of about 1v peak-peak (which completely drowns the audio).

    I'm pretty sure what I'm seeing isn't cross talk between the two channels as
    the noise is constant, even when the audio on the second channel is quiet.

    I am at a loss trying to understand how this could happen - can anybody shed
    any light?


  2. To me it seems that your timing of the audio stream is shifted by one bit so
    that the MSB of the
    left channel is actually LSB of the right one...If you play only left
    channel, it works with one bit
    less resolution and if you play right only, it's LSB actually changes MSB of
    the LEFT channel.

  3. Peter Neal

    Peter Neal Guest

    Fabulous - that's solved it! Now playing crystal clear stereo audio.

    Many thanks for your help.


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