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Question asked by naimark on Nov 12, 2015
Latest reply on Nov 19, 2015 by naimark


For our new design we’re using the ADAU1451WBCPZ  DSP.


Unfortunately I ‘m experiencing PLL lock problem.


The PLL lock way form shown below:



PLL non locked.png

We’re using external clock 24.576MHZ for the 16 channels output TDM.


PLL fitter connection showing below:

    PLL fitter connection.png

I tried to adjust R413 in a range from 0 to 10 KOhm with no results.


The only if I changed C400 from 15pF to 4700pF I got clean 2V lock level.


Do you have any idea what is wrong?


Thank you


Mark Naiditch