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Original question:

PCM1772: Pin status before and after internal reset

PCM1772: Power supply line capacitor recommendation

Kazuki Kuramochi
Genius 11275 points
Part Number: PCM1772


Hello Expert,

I have question for PCM1772's recommended cap on power supply line(VCOM, VCC1, VCC2).
In datasheet, it recommend to use 10uF tantalum cap on power supply line.
Then, I'd like to know about following points.

  1. Could I use 10uF MLCC instead of tantalum cap?
  2. Is there any concern when I don't use lower capacitance cap?(e.g. there is possibility that THD+N become worse or etc...


I'm looking forward to hearing back from you.


Best regards,
Kazuki Kuramochi

  • 0
    TI__Guru 55633 points

    Hi Kuramochi-san,

    1. You can use MLCC for this application.  The PDS was written when the quality of ceramic capacitors at higher capacitance values was not as good.  Now they are recommended.

    2.  These capacitors are meant to improve the PSRR of the device.  The large values are lower the fC of any filtering behaviors that are found.  If you decrease the values, then those cutoff frequency become greater.  I do not think you would notice any audible difference between 10µF and 100nF, though it ultimately depends on the noise of the system. 

    Thanks,

    Paul