I use the AD1934 to build a precision audio generator. I want to play back audio with very precise timing in the 1ms range. I notice a lag of ~6ms when I turn ON my audio stream, which is supplied by an FPGA. The TDM clocks are always on. My guess is, there is a (hidden) auto mute feature to reduce idle noise, which will power down the filter and DAC when it detects a certain number of consecutive zeros in the audio stream. Can anyone confirm this?
I also notice ~600us lag when I turn OFF my audio stream, but this can be completely explained as the delay of the digital oversampling filter in the DAC.