QN8027-SANB-Hardware-Application-Note-V-0-25-10220

ApplicationNoteQN8027Rev0.25(10/09)Copyright©2009byQuinticCorporationPage1ConfidentialBConfidentialInformationcontainedhereiniscoveredunderNon-DisclosureAgreement(NDA).QN8027HardwareApplicationNoteOctober,2009HardwareApplicationNoteQN8027,Rev0.25(10/09)Copyright©2009byQuinticCorporationPage2ConfidentialBConfidentialInformationcontainedhereiniscoveredunderNon-DisclosureAgreement(NDA).Contents1FeatureOverview....................................................................................................41.1MainFeatureforQN8027..............................................................................................................42HardwareDesign.....................................................................................................52.1PowerSupply.................................................................................................................................52.2ControlInterface.............................................................................................................................52.3ClockInterface...............................................................................................................................62.4AudioInputInterface.....................................................................................................................72.5DifferentialAudioInputReferenceCircuit....................................................................................82.6FMTransmitterAntennaInterface.................................................................................................92.7DifferencebetweenQn8000andQN8027...................................................................................102.8PowerAmplifierCircuitforQN8027...........................................................................................102.9SchematicofQN8027ReferenceDesign.....................................................................................122.10PCBLayoutforQN8027..............................................................................................................132.11ANExampleofPCBLayout........................................................................................................15HardwareApplicationNoteQN8027,Rev0.25(10/09)Copyright©2009byQuinticCorporationPage3ConfidentialBConfidentialInformationcontainedhereiniscoveredunderNon-DisclosureAgreement(NDA).REVISIONHISTORYREVISIONSummaryofChangesDate0.1Draft.0301090.21AddPAreferencecircuit0624090.221.Change‘FMO’to‘RFO’;2.AddthePAoutputresult,amplify15dBoftheRFpower.0629090.23ChangetheQN8027SANBreferencedesign.07/24/20090.241.InFigure11:-AddaPAreferencedesignschematicforQN802715cmantenna;-Addanote:“IfVCCisintherange+2.8V~+3.3V,VIOmaydirectlyconnecttoVCC(pin3),ifthevoltageforVIOpinisbiggerthan+3.6VQN8027willbedamaged”onthereferenceschematicneartheVIOpin-Addanote:“thebypassripplecapC01&C02maybeplacedasnearaspossibletopin3whenpcblayout”onthereferenceschematicnearthecapacitorC01&C02-Addanote“itmaybeplacedasnearaspossibletopin5toreducetheparasiticalinductorwhenpcblayout,theparasiticalinductormayinfluenceL4value,ctmmayfinetuneL4valuefrom100nHto150nHtoseewhichoneisthebest”.OnthereferenceschematicneartheinductorL42.AddPCBlayoutguideinSection2.1108/31/20090.251.CorrectamistakeaboutthePACAPcalibrationresultonpage9.Changefrom0x3f~0x00to0x1f~0x00;2.ReplacetheFigure1;3.Modifythegrammarandsyntax.10/22/2009ImportantNoticeThematerialcontainedinthisdocumentisprovided“asis”andissubjecttochange,withoutnotice,infutureeditions.Further,tothemaximumextentpermittedbyapplicablelaw,Quinticdisclaimsallwarranties,eitherexpressorimplied,withregardtothismanualandanyinformationcontainedherein,includingbutnotlimitedtotheimpliedwarrantiesofmerchantabilityandfitnessforaparticularpurpose.Quinticshallnotbeliableforerrorsorforincidentalorconsequentialdamagesinconnectionwiththefurnishing,use,orperformanceofthisdocumentorofanyinformationcontainedherein.ShouldQuinticandtheuserhaveaseparatewrittenagreementwithwarrantytermscoveringthematerialinthisdocumentthatconflictwiththeseterms,thewarrantytermsintheseparateagreementshallcontrol.HardwareApplicationNoteQN8027,Rev0.25(10/09)Copyright©2009byQuinticCorporationPage4ConfidentialBConfidentialInformationcontainedhereiniscoveredunderNon-DisclosureAgreement(NDA).1FeatureOverviewTheQN8027isahighperformance,lowpower,single-chipstereoFMtransmitter,designedforMP3players,GPS.TheQN8027alsosupportsRDS/RBDSdatatransmit.1.1MainFeatureforQN8027
76MHz~108MHzfullbandtuningin
AutoPAoutputpowercalibration
RDS/RBDStransmit
12MHz/24MHzcrystalsupportand12MHz/24MHzexternalclocksupportHardwareApplicationNoteQN8027,Rev0.25(10/09)Copyright©2009byQuinticCorporationPage5ConfidentialBConfidentialInformationcontainedhereiniscoveredunderNon-DisclosureAgreement(NDA).2HardwareDesignThischapterdescribesthedetailsofhardwaredesignandschematicofreferencedesign.2.1PowerSupplyQN8027isintegratedLDOinside,andtheVCCacceptsthepowersupplyvoltagerangefrom2.7V~5.0V.QN8027hasapin‘VIO’whichisusedt