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PCM6020-Q1: Attenuator gain

Arie Li
Expert 3390 points
Part Number: PCM6020-Q1

Hi experts,

May I know the attenuator gain of PCM6020? It seems it is not mentioned in datasheet. Thanks.

Arie

  • +1
    TI__Genius 16910 points

    Hi Arie,

    You are correct. it seems that this attenuator gain is not documented in the data sheet. 

    However the configurable channel gain (0-42 db) will include this attenuation.

    May I ask why you are interested in this attenuation value?

    I don't believe that it is critical to know the exact attenuation value.

    Regards,

    Arthur

  • 0 in reply to Arthur Brown
    TI__Expert 3390 points

    Hi Arie,

    You are correct. it seems that this attenuator gain is not documented in the data sheet. 

    However the configurable channel gain (0-42 db) will include this attenuation.

    May I ask why you are interested in this attenuation value?

    I don't believe that it is critical to know the exact attenuation value.

    Regards,

    Arthur

  • 0 in reply to Arie Li
    TI__Expert 3390 points

    Hi Arthur,

    Thanks for your reply, so the attenuator and the PGA together determine the channel gain(0-42dB), right? Could you please help to explain the working principle of the attenuator and PGA? I only found a draft description in datasheet. Thank you.

  • 0 in reply to Arie Li
    TI__Genius 16910 points

    Hi Arie,

    the internal architecture of the PGA and ADC are design to accept a specific input full scale and gain range. for this reason with some large input signals it is necessary to attenuate the signal before amplification to meet the required gain range for the PGA and the full-scale value at the input of the ADC.

    the attenuator exist because for some applications the input to the PCM would be to large to meet these requirements. 

    The attenuation and gain staging is optimized for the best performance of noise + THD. unfortunately this is all I am able to share.  I am not able to share exactly how these values are selected.

    Regards,

    Arthur