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PCM1690: Figure 39 input capacitor

Yusuke Mukuno
Expert 7395 points
Part Number: PCM1690

Hi Expert, 

Regarding the Figure39 / PCM1690

I think, It is the ac coupled differential to single end conversion circuit. Is the polarity of the input capacitor reversed?

Thanks

Muk

  • 0
    TI__Guru 53923 points

    Hi Mukuno-san,

    I think you are correct, it would be best practice to have the high-side connected to the DAC output.  Ultimately though, I do not think it will cause a problem either way.  Most electrolytic caps are rated for a reverse voltage of about 10% of their rated voltage.  That is why you can see polarized electrolytic capacitors on the output of some audio systems.

    Thanks,

    Paul