We have an ADAU1761 audio codec with a single ADMP421 MEMS mic setup configured for the left channel. Would like information on the following issues:
1) Is it possible to split a single channel mono input over both channels on the output of the ADAU1761? We DMA the output samples directly into memory, but the DMA captures both left and right channels although we only have the MEMS mic configured for the left channel. Is it possible to split the MEMS mic left channel input so that it appears on both channels at the output of the ADAU1761?
2) The volume control block in the SigmaStudio schematic causes high noise in the captured sound with any setting above -35. Has anyone faced this issue before?