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AD1937:Distortion noise when wav file finishes playing

Hi, ADI

>I have a problem when used AD1937 on my board.We can saw a clear distortion when we play the sine wav file, we also use the Cool Edit Pro tools to review the soure file, it's a good sine wavform, not found any distortion from the begining to the last.

>Attached the hardware circuit for AD1937,the AD1937 code and driver we used and also the output waveform we probed on audio jack.

Thanks

Ryan

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  • Hi,Coleman

    >>27 MHz XTAL is the input source of MAX9485 and we used the CLK1 pin of MAX9485 as the MCLk of AD1937. The CLK1 output can be choosed by the HW or SW setting and we probed 24.576 MHz actually.

    >> I have tried Nitin's new zImage with updated register, seems it' a bad settings.Attached the output waveform.

    Thanks

    Ryan

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  • Hi,Coleman

    >>27 MHz XTAL is the input source of MAX9485 and we used the CLK1 pin of MAX9485 as the MCLk of AD1937. The CLK1 output can be choosed by the HW or SW setting and we probed 24.576 MHz actually.

    >> I have tried Nitin's new zImage with updated register, seems it' a bad settings.Attached the output waveform.

    Thanks

    Ryan

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