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DS90UB914A-Q1: VDDPLL Bypass capacitor

Kuramochi Tadahiko
Guru 28715 points

Part Number: DS90UB914A-Q1

Hi,

VDDPLL Bypass capacitor is recommended 0.01uF(C6)+0.1uF(C14)+4.7uF(C17) on the datasheet figure 33.

However my customer locate 22uF to support power sequence. 

Does it have any problem? (I think no problem.)

Best Regards,

Kuramochi

  • 0
    TI__Guru** 114280 points
    Hello Kuramochi-san,

    22uF is not really required because the VDDPLL and VDDIO can get high at the same time (requirement delay minimum= 0 mS).
    If they would like to keep the 22uF they can do that but they need the 10nF and 100nF to filter the high frequency noise.