[SI-LIST] Re: Decoupling Capacitor
- From: John Barnes <jrbarnes@xxxxxxxxx>
- To: nagaraj@xxxxxxxxxxxxxxxxxxxx, si-list@xxxxxxxxxxxxx
- Date: Tue, 13 Aug 2002 07:19:01 -0400
Nagaraj,
Since the TMS320c64X's are packaged in a ball-grid array (BGA), I'd
recommend providing a 100nF X7R decoupling capacitor for each "cluster"
of balls on a given supply voltage. Each cluster consists of balls that
are next to each other vertically, horizontally, or diagonally:
ooooooo oooooooo oooooooo
oooXooo oooXXooo oooXoooo
oooXooo oooooooo ooooXooo or combinations thereof
ooooooo oooooooo oooooooo
For clusters that supply power to oscillators or phase-locked loops, if
not otherwise specified by the manufacturer, add a lower-valued ceramic
in parallel with the 100nF. Such as a 220pF C0G capacitor.
Finally, on the four sides, or at the four corners of the chip, add a
"bulk" ceramic capacitor to each supply voltage. I like 2.2uF Y5U's for
these guys.
John Barnes
dBi Corporation
http://www.dbicorporation.com/
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