Datasheet

AD9954
Rev. B | Page 32 of 40
LAYOUT CONSIDERATIONS
For the best performance, the following layout guidelines
should be observed. Always separate the analog power supply
(AVDD) and the digital power supply (DVDD), even if just
from two different voltage regulators driven by a common
supply. Likewise, the ground connections (AGND and DGND)
should be kept separate as far back to the source as possible (for
example, separate the ground planes on a localized board, even
if the grounds connect to a common point in the system).
Bypass capacitors should be placed as close to device pins as
possible. Usually a multitiered bypassing scheme consisting of a
small high frequency capacitor (100 pF) placed close to the
supply pin and progressively larger capacitors (0.1 µF and 10 µF)
further back to the actual supply source works best.