Audio Input not working (PCM2900c)

Hi, David,

Unfortunately, we made a mistake and assembled some boards with the wrong IC, and these got out before we found out the error.

Please return this board to the place you bought it and ask for a replacement.

Alternately, you can request a free PCM2906C device from our website and change the part out yourself.

-d2

Hi, 

Even if the IC is a PCM2900c shouldn´t the audio in line (microphone) be working? Is it necessary to enable something to make it able to record? 

Thank you

Hi David:

           Do you try to use line in to record the music? Because our EVM input don't have the MICBIAS to make the MIC work, you should add a external MICBIAS to make it work. And default setting can make the board work.

Hi David:

               What's your part series? Usually the MIC's input is very small. And need PGA to increase the MIC voice. 

              You can find in this application note.http://www.ti.com/lit/an/sbfa020/sbfa020.pdf

Yes I am trying to record, how can I add an external MICBIAS? From what I've read I have to add more voltage to the microphone right? 

How can I achieve my objective? how can I add an external MICBIAS?

Thank you!

Hi David：

                 Below is the PCM2912's user guide. You can refer to this schematic. And you should use external MICBIAS like VDD to replace the MICBIAS pin.

                 http://www.ti.com/lit/ug/sbau132/sbau132.pdf