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1、Maxim>DesignSupport>TechnicalDocuments>Tutorials>A/DandD/AConversion/SamplingCircuits>APP5450Maxim>DesignSupport>TechnicalDocuments>Tutorials>Amplifiers>APP5450Maxim>DesignSupport>TechnicalDocuments>Tutorials>AnalogSwitchesandMultiplexers>APP5450Keywords:PCB,mixed-signal,layout,ground,grounding,gr
2、ounds,printedcircuitboardTUTORIAL5450SuccessfulPCBGroundingwithMixed-SignalChips-FollowthePathofLeastImpedanceBy:MarkFortunato,SeniorPrincipalMemberofTechnicalStaffOct15,2012Abstract:Thistutorialdiscussesproperprinted-circuitboard(PCB)groundingformixed-signaldesigns.Formostapplicationsasimplemetho
3、dwithoutcutsinthegroundplaneallowsforsuccessfulPCBlayoutswiththiskindofIC.Webeginthisdocumentwiththebasics:wherethecurrentflows.Later,wedescribehowtoplacecomponentsandroutesignaltracestominimizeproblemswithcrosstalk.Finally,wemoveontoconsiderpowersupply-currentsandendbydiscussinghowtoextendwhatweh
4、avelearnedtocircuitswithmultiplemixed-signalICs.AsimilarversionofthisarticleappearsinthreepartsonEDN,August27,2012,September11,2012,andSeptember17,2012.IntroductionBoard-leveldesignersoftenhaveconcernsabouttheproperwaytohandlegroundingforintegratedcircuits(ICs),whichhaveseparateanaloganddigitalgro
5、unds.ShouldthetwobecompletelyseparateAttendthisbriefwebcastbyMaximonandnevertouch?ShouldtheyconnectatasinglepointwithcutsinthegroundplanetoenforcethisTechOnlinesinglepointor"Mecca"ground?HowcanaMeccagroundbeimplementedwhenthereareseveralICsthatcallforanaloganddigitalgrounds?Thistutorialdiscussespr
6、operprinted-circuitboard(PCB)groundingformixed-signaldesigns.FormostapplicationsasimplemethodwithoutcutsinthegroundplaneallowsforsuccessfulPCBlayoutswiththiskindofIC.Next,welearnhowtoplacecomponentsandroutesignaltracestominimizeproblemswithcrosstalk.Finallywemoveontoconsiderpowersupply-currentsand
7、endbydiscussinghowtoextendwhatwehavelearnedtocircuitswithmultiplemixed-signalICs.FollowtheCurrentRememberthatwecallacollectionofconnectedelectricalorelectroniccomponentsa"circuit"becausecurrentsalwaysflowfromasou
