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ADS8406
SLAS426A–AUGUST2004–REVISEDDECEMBER2004
aswiththeagndconnections,+vashouldbeconnectedtoa5-vpowersupplyplaneortracethatisseparate
fromtheconnectionfordigitallogicuntiltheyareconnectedatthepowerentrypoint.powertotheads8406
shouldbecleanandwellbypassed.a0.1-µfceramicbypasscapacitorshouldbeplacedasclosetothedevice
aspossible.seetable2fortheplacementofthecapacitor.inaddition,a1-µfto10-µfcapacitoris
推荐.insomesituations,additionalbypassingmayberequired,suchasa100-µfelectrolyticcapacitor
orevenapifiltermadeupofinductorsandcapacitors—alldesignedtoessentiallylow-passfilterthe5-vsupply,
removingthehighfrequencynoise.
table2.powersupplydecouplingcapacitorplacement
POWERSUPPLYPLANE
CONVERTERANALOGSIDECONVERTERDIGITALSIDE
SUPPLYPINS
(4,5),(8,9),(10,11),(13,15),
pinpairsthatrequireshortestpathtodecouplingcapacitors(24,25),(34,35)
(43,44),(45,46)
pinsthatrequirenodecoupling12,1437
22
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