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Simultaneous serial audio and digital microphones on ADAU1777?

Question asked by HonestEffort on Mar 8, 2018
Latest reply on Mar 12, 2018 by DaveThib

From the data sheet for the ADAU1777, it is clear that the input path can accept analog microphones, digital microphones, and serial audio inputs. I have successfully brought up designs on the EVAL-ADAU1777 that use mixed analog and digital PDM mic inputs, such as 2 analog and 2 digital PDM.

 

My question is, can the ADAU1777 simultaneously accept both digital PDM mic inputs AND serial audio inputs?

 

 

DAC_SDATA (the serial input pin) is only shared as a multipurpose pin MP0. I see where the serial data output ADC_SDATA0 cannot be used simultaneously with PDMOUT, and that serial data output ADC_SDATA1 shares a pin with CLKOUT, needed for digital microphones.

 

Can the serial data inputs be used simultaneously with, say, 2 digital microphones? I see that the "core input selection" block has 6 inputs and 4 outputs into the audio processing core, so I doubt that serial audio data inputs can be processed simultaneously to 4 digital microphones (6 channels total).

 

Anyone with experience in this area?

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