ADAU1442 Clocks

Hi all,

I've got a setup in which a DSP (ADAU1442) is connected to 3 ADC (1974) as input and another DSP as output. Currently the ADAU1442 is master of the TDM stream to the ADC's bus slave to the TDM stream in the output. However, I noticed some artifacts, probably due to the internal clk difference of ADAU 1442 (XTAL) and the output. Is it possible to make the sync on the TDM signal of the output and use this same clock to connect to the ADC? Any advice on this is highly appreciated! Thanks in advice!

Best regards,

Guy

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  • Hi Alan,

    Thank you for your fast reply! I haven't been using the ASRC's because the sample rate isn't realy different, it's just the clocks that are not synced. Anyway, I can imagine that using the ASRC's could help. I will try to figure it out. If there is useful information regarding (setting up) the ASRC, please let me know, I'm not familiar with it and it looks rather complex.

    Regarding the AD1974 and ADAU1442, they both have their own crystal but the ADC is configured in slave mode. Isn't this enough? If not, is it better to use ASRC as well or make MCLK clock distribution instead of separate chrystals? Thanks in advance!

    Best regards,

    Guy

Reply
  • Hi Alan,

    Thank you for your fast reply! I haven't been using the ASRC's because the sample rate isn't realy different, it's just the clocks that are not synced. Anyway, I can imagine that using the ASRC's could help. I will try to figure it out. If there is useful information regarding (setting up) the ASRC, please let me know, I'm not familiar with it and it looks rather complex.

    Regarding the AD1974 and ADAU1442, they both have their own crystal but the ADC is configured in slave mode. Isn't this enough? If not, is it better to use ASRC as well or make MCLK clock distribution instead of separate chrystals? Thanks in advance!

    Best regards,

    Guy

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