AnsweredAssumed Answered

Hidden auto mute feature in AD1934?

Question asked by FalkB on Oct 9, 2013
Latest reply on Oct 15, 2013 by ColemanR



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.