ADAU1445 PLL filter.

From the datasheet:

We spec PVDD = 3.3 V. The PLL loop filter should be connected to 3.3 V at all times. Connecting it to 1.8 V would probably just cause the PLL to stop functioning, but would not cause damage.

Hi, the confusion here was really caused by an error on my part. When designing the PCB I had connected PVDD up to the DVDD rail and at the time I hadn't even noticed that there was a P, I thought it said DVDD. I had however connected the PLL filter up to the 3.3v line and when I came to power on the board, nothing happened, except that the CLKOUT clock looked a mess. At this time I was still under the impression that PVDD should be connected to 1.8 volts, as should the PLL filter, but as I had connected it to 3.3 volts I thought it might have destroyed something. I fixed the error by cutting some traces and hooked PVDD up to the 3.3 volt line and everything jumped into action.

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Thank you,
EZ Admin