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PCM5101A: The analog output level changes even though the same level of audio signal is input

Shinichi Inoue
Guru 20456 points
Part Number: PCM5101A

Dear Specialists,

My customer is considering PCM5101A and has a question.

I would be grateful if you could advise.

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I have a question regarding "PCM5101APW".

When inputting the same digital audio input (with different sampling frequencies), the analog output level is about 3 dBV different.

I don't understand why the analog output level changes even though inputting audio at the same level.

Is it possible that the output level changes due to component constants or circuits after OUTL/OUTR?

Are there any other possible causes?

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I appreciate your great help in advance.

Best regards,

Shinichi

  • 0
    TI__Mastermind 23780 points

    Hello Shinichi,

    We need more specific information about the sampling rates that were used,  as well as the used  input frequency, also info about the LPF or amplifier that might be used at the output ( that he is referring to "Component constants or circuits after OUTL/OUTR" .)   

     The audio input range is 20-20KHz and thus minimum fs needed is 40KHz ( 44KHz is used commonly). Also the LPF used at the DAC output has to be able to accommodate this range. Please ask him to verify  these  criteria. 

    If still he has any issue, kindly  send me the  schematics,  along with complete information about input, I2S signals , and the LPF configuration.

    Regards,

    Arash