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PCM4202: Vcom pin bypass cap

Mochi
Genius 4035 points
Part Number: PCM4202

Hello,

Our customer plans to increase bypass cap value from 0.1uF on application circuit to optimize sound character.

What is internal Vcom buffer output node stability or start up timing issue? Can we increase it to like 470uF?

Is there any guideline of maximum capacitance?

 

Regards,

Mochizuki

  • 0
    TI__Mastermind 23050 points

    Hi Mochi-san,

    I would not recommending increasing the capacitance to a value this large. Although these are buffered outputs they only have a few hundred uA of drive capability. Since there shouldn't really be varying load conditions on VCOM there shouldn't be any transients, but increasing this capacitance is not going to boost performance and will lead to much higher inrush currents on startup and potentially delay the rise of VCOM so I would not recommend using a value larger than 10uF or so.

    Best,

    Zak

  • 0 in reply to Zak Kaye
    Genius 4035 points

    Hi Zak-san,

    Thank you for your prompt reply for this type of legacy ADC.

    Our customer appreciate your suggestion, they will try to optimize sound with 10uF or less Vcom bypass cap value.

    Regards,

    Mochizuki