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ADAU7002 PDM to PCM convert with single channel output

Question asked by Engin on Jul 30, 2018
Latest reply on Jul 31, 2018 by DaveThib

Hi,

I have two digital mems microphones which share a single PDM channel. This is the input to the ADAU7002 which is also fed by LRCLK and BCLK. Everything is fine in the sense that I can see the two mic serial PDM data on the high and low cycles of the LRCLK. Config pin is set to high so that I2S mode is selected. When I look at the SDATA, I see the same PCM serial data on both LRCLK high and low whereas I made sure that the PDM data are different. That is, different PDM data for each mic comes in and only one mic data is seen on both LRCLK high and low.  By the way, the PCM data is right for one mic signal. What might be the cause of this strange result? Anyone had a similar observation before? Is there a different package for ADAU7002 so that soldering and handling on pcb is easier? Any alternative to ADAU7002 in this context?

 

Regards

Engin

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