MSP430F149-Tkool Electronics

Tkool Electronics

DescriptionTheCD405xBanalogmultiplexersanddemultiplexersaredigitally-controlledanalogswitcheshavinglowONimpedanceandverylowOFFleakagecurrent.ThesemultiplexercircuitsdissipateextremelylowquiescentpoweroverthefullVDDVSSandVDDVEEsupplyvoltageranges,independentofthelogicstateofthecontrolsignals.TheCD4051Bisasingle8-Channelmultiplexerhavingthreebinarycontrolinputs,A,B,andC,andaninhibitinput.Thethreebinarysignalsselect1of8channelstobeturnedon,andconnectoneofthe8inputstotheoutput.CatalogDescriptionPinoutConfigurationandFunctionCD4051BlockDiagramDocumentsandMediaFeaturesApplicationCD4051TypicalApplicationCircuitsOrdering&QuantityPinoutConfigurationandFunctionCD4051BlockDiagramThelogicdiagramofCD4051iscomposedofthreeparts:logiclevelconversioncircuit,8select1decodingcircuitand8CMOSswitchunits.A,BandCare3-bitbinaryaddressinputterminals,and8combinationsof3-bitbinarycanbeusedforselection8channels;INHistheaddressinputprohibitionterminal,whenitishigh,theaddressinputterminalisinvalid,thatis,nochannelisstrobed.TheinputlevelsofA,B,CandINHarecompatiblewithTTL.CD4051has8input\outputterminals,1output/inputterminal,digitalcircuitpowersupply+Eand-E1,analogcircuitpowersupply+Eand-E2.ThemainfunctionofthelogiclevelconversioncircuitistoinputtheaddressA,B,CandaddressinputinhibitterminalINHinputTTLlogiclevelisconvertedintoCMOSlevel,sothattheswitchunitcanbecontrolledbyTTLlevel.Themainfunctionofthe8-to-1addressdecodingcircuitistoconverttheaddressinputsignalfromthelogiclevelconversioncircuitintothecorrespondingswitchunitstrobesignalandturnonthecorrespondingswitchunit.DocumentsandMediaDatasheetCD405xBCMOSSingle8-ChannelAnalogMultiplexer/DemultiplexerwithLogic-LevelConversiondatasheet(Rev.I)FeaturesWideRangeofDigitalandAnalogSignalLevelsDigital:3Vto20VAnalog:20VP-PLowONResistance,125Ω(Typical)Over15VP-PSignalInputRangeforVDDVEE=18VHighOFFResistance,ChannelLeakageof100pA(Typical)atVDDVEE=18VLogic-LevelConversionforDigitalAddressingSignalsof3Vto20V(VDDVSS=3Vto20V)toSwitchAnalogSignalsto20VP-P(VDDVEE=20V)MatchedSwitchCharacteristics,rON=5Ω(Typical)forVDDVEE=15VVeryLowQuiescentPowerDissipationUnderAllDigital-ControlInputandSupplyConditions,0.2W(Typical)atVDDVSS=VDDVEE=10VBinaryAddressDecodingonChip5V,10V,and15VParametricRatings100%TestedforQuiescentCurrentat20VMaximumInputCurrentof1Aat18VOverFullPackageTemperatureRange,100nAat18Vand25CBreak-Before-MakeSwitchingEliminatesChannelOverlapApplicationAnalogandDigitalMultiplexingandDemultiplexingA/DandD/AConversionSignalGatingFactoryAutomationTelevisionsAppliancesConsumerAudioProgrammableLogicCircuitsSensorsCD4051TypicalApplicationCircuits1.CD4051,CH3130multi-channeldemodulatorcircuitdiagramThiscircuitismainlycomposedof8-channelanalogswitchCD4051andvoltagefollowerCH3130,etc.TheinputsignaloftheprohibitionterminalINHofanalogswitchCD4051isusedtocontrolthegatingofvoltagefollowerCH3130,therebyperformdemodulationtomultipleanalogsignals.2.CD4051constructs32-channelcircuitBecausetheCD4051hasonlyeightinputports,fourCD4051sareneededtobuilda32-waymultiplexer,labeledINH1,INH2,INH3,andINH4.The32-waymultiplexershouldhave5controlports,ofwhichthefirstthreearetheinputportsofCD4051andthelasttwoarecontrolports.(BecauseCD4051hasthreeinputports),labelthemasD1,D2,D3,D4,D5(0000011111,00000channel0,11111channel31).Thebasicideaistorealizethechoiceof32channelports(0-7,8-15,16-23,24-31)byselecting4CD4051s.IfyouchoosethethirdCD4051,youcanchoose16-23(10000-10111)channelport.However,theselectionofCD4051isachievedbycontrollingtheINHlevelofeachCD4051.Forexample,ifyouwanttoturnonthethirdCD4051,makeitsINHhigh(atthistimeD5=1,D4=0,thenINH3=D5!D4).Therefore,thechoiceofINHisachievedbycontrollingthelogicalrelationshipbetweenD5andD4.WhereINH1=!D5!D4;INH2=!D5D4;INH3=D5!D4;INH4=D5D4.