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PCM2912A Design with Dynamic Microphone Not Electret Microphone

DaveLee75
Prodigy 205 points
Other Parts Discussed in Thread: PCM2912A

Do I need a Preamp for the Dynamic Microphone to input with PCM2912A?

  • 0
    TI__Guru** 109395 points
    Hi David,

    PCM2912A has an integrated mic amplifier which can be configured for +20/0dB and also an internal PGA that goes from -12dB to +30dB in 1dB steps.

    Best regards,
    -Ivan Salazar
    Texas Instruments
  • 0
    Prodigy 205 points
    Hi Ivan,
     
    In my case it does not need the BIAS Voltage so would you please help me to configure the microphone input.
    Please see attached data sheet for my Microphone  FB-EI-60080 
    It is not an electret microphone. It is a Balanced Armature Microphone.
    How to configure to have + 30dB Since I had very low input result.
    Thanks a lot from your help.
     
    David Trinh Le 
    Tactical Command Industries | A BRAND OF THE SAFARILAND GROUP |
    Electrical Engineer
    3120 East Mission Boulevard
    Ontario, CA  91761
    Office: (909) 923.7300 ext. 33742
     
     
  • 0 in reply to DaveLee75
    TI__Guru** 109395 points
    Hi David,

    You can try this:
    - Set MAMP (pin 23) to High (3.3V from Vcc); you can connect MAMP to Vccp. This will set the input mic amplifier to +20dB.
    - Connect PCM2912A USB to a PC and configure the Mic input volume at the Recording Devices menu to the desired level. This internal PGA goes from -12dB to +30dB.
    You can set PGA to max and turn on mic amp (MAMP) to see if that's enough gain for your application.
    MBIAS can be left unconnected.

    Best regards,
    -Ivan Salazar
    Texas Instruments