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1、单片机基础教程5Thispaperconsistsof050602122contributionsPptdocumentsmayexperiencepoorbrowsingontheWAPside・ItisrecommendedthatyoufirstselectTXT,ordownloadthesourcefiletothelocalview.Theninthchapter,MCS-51andD/AandA/Dconvertexinterface,chapterandconverterinterface9.1overviewofthe9.2D/Aconverte
2、randitsinterfaceconverteranditsinterface9.3A/Dconverteranditsinterfaceconverteranditsinterface9.1overviewFig.9TschematicdiagramofinterfacebetweensinglechipmicrocomputerandcontrolledentityReturntothehomepageofthischapter9.2D/AconverteranditsinterfaceconverteranditsinterfaceInterfacesan
3、dinterfacesfor9.2.1,D/Aconverters,converters,9.2.2,MCS-51,andD/AReturntothehomepageofthischapter9.2.1D/AconverterconverterFig.9一2blockdiagramofthesimplestD/AconverterRelation:relationship:Vout=B*VR*type,isaconstant;forintheformula,VRisaconstantreferencevoltagewhichisdecidedbytheconsta
4、ntreferencevoltageVREF;Bfordigital,oftenasabinarynumber・ThenumberofdigitsinB,usuallynumeric,oftenabinarynumber・Thenumberofbits,theaveragebit,andthe12bitconverterchipmodelaredetermined・The8bitandbitwaitaredeterminedbytheD/Aconverterchiptype・ThegeneralformulafordeterminingthebittimeofaB
5、bit,bit,andsoonisthatthegeneralformulaforthenbitis:thegeneralformulaforbittimeisB=,bn-1,bn-2・・・Bl,bO二,bn-1*2nT+,BN*2*2n-2+.・・+Blx21+BOx20xxx,thehighestposition,forthelowest,thelowest・Intheformula,bn~listhehighestofB,andBOisthelowest・HighestpointforTheprincipleof1.D/AconverterD/Aconver
6、terprinciple:theprincipleoftheconverter:theprincipleoftheconverter,theinputdigitalquantity,eachaccordingtoitsweight,respectively,convertedtoanalog,andthroughtheoperationamplifiersummationsummation(asshowninFigure9-3)・Quantityandsummationbyoperationalamplifiers(asshown).AccordingtoJFHe
7、rve，s1aw,thefollowingrelationisestablished:accordingtoJFHerve'slaw,thefollowingrelationsareestablished:13二二23,12=22,11=21,10=20,・・・Figure9-3TtyperesistornetworktypeD/Aconverter2.D/Aconverterperformanceindicators一converterperformanceindicatorsTheresolution(resolution(Resolution)resolut
8、ionre
