why there is a capacitor in the input voltage of a chip?


i notice there capacitor plugged in chips input voltage of dc, understand it's used filter voltage remain steady possible, heard need choose capacitor voltage of twice voltage supply.

but don't know how choose capacitor in farade wise....

in datasheets there information, not in of them.
and if need design own chip, how choose capacitor (farade)?????

what circuit referring to?


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