Just completed a board that uses the ADAU1462to read audio through the S/PDIF optical input. The design closely follows the ADAU1466 evaluation board, with a self-boot EEPROM (which I successfully programmed from SigmaStudio).
I also followed the instructions to set up the SPDIF input, using an ASRC.
It mostly "works like a charm", except for the loud pop/click when audio starts. By "when audio starts", I mean when I click PLAY for the first time on the audio player (using audacious on Linux). This seems to correspond to the moment when the SPDIF line becomes active.
And by "loud pop/click", I mean really loud (as in, I-burned-one-tweeter loud!!!).
I tried the "mute when lock lost" setting of the ASRC, but it seems to make no difference. Here's a screenshot:
The SPDIF tab seems to have a similar setting, but that control is disabled and does not allow me to even show the pull-down list:
Neither the top-left "SPDIF LOCK DET" nor the "SPDIF Loss of Lock" controls allow me to do anything (they're both disabled). I cannot even read the whole text that is selected in the "SPDIF Loss of Lock" pull-down list.
Do I have something incorrect in the settings? Or am I missing something else? How can I make the system entirely clickless?