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UCD90240: Reference Decoupling

Ryan.Bishop
Expert 3900 points
Part Number: UCD90240

Hi,

Page 42 of the device datasheet states "One 1-μF X7R ceramic capacitor in parallel with one 0.01-μF X7R ceramic capacitor for VREFA+ decoupling".

On the UCD90240 EVM, we place .01uF, .1uF, and 10uF capacitors on the VREF line.

Is one of the above configurations more preferred/recommended by TI for a customer design? Or is the difference between them negligible? 

Thanks!

Ryan

  • 0
    TI__Guru 60800 points
    The 10uF is required by the Reference device itself.
    1uF gives more filtering functions. there is no much difference. If you have concerns, please follow the number from Datasheet.
    Regards
    Yihe