For our new design we’re using the ADAU1451WBCPZ DSP.
Unfortunately I ‘m experiencing PLL lock problem.
The PLL lock way form shown below:
We’re using external clock 24.576MHZ for the 16 channels output TDM.
PLL fitter connection showing below:
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?