标签: phones

Lesson21Third-GenerationMobilePhonesDigitalVoiceandData.ppt

GPS前端评估板BGU7005AEC-Q100用户手册UM10381UsermanualfortheBGU7005GPSFrontendevaluationboardRev.01―21October2009UsermanualDocumentinformationInfoContentKeywordsLNA,FE,GPS,SAW,BGU7005,MobilePhonesCo-habitationAbstractThisdocumentexplainstheBGU7005GPSfront-endevaluationboardNXPSemiconductorsUM10381BGU7005GPSFEEVBRevisionhistoryRevDateDescription0121October2009FirstreleaseContactinformationForadditionalinformation,pleasevisit:http://www.nxp.comForsalesofficeaddresses,pleasesendanemai……

GPS前端评估板BGU7004AEC-Q100用户手册UM10490UsermanualfortheBGU7004GPSFrontendevaluationboardRev.1.0―14June2011UsermanualDocumentinformationInfoContentKeywordsLNA,FE,GPS,SAW,BGU7004,MobilePhonesCo-habitationAbstractThisdocumentexplainstheBGU7004AEC-Q100qualifiedGPSfront-endevaluationboardNXPSemiconductorsUM10490BGU7004GPSFEEVBRevisionhistoryRevDateDescription1.020110614FirstreleaseContactinformationForadditionalinformation,pleasevisit:http://www.nxp.comForsalesoff……

摘要：开关转换器集成电路设计为白光LED驱动器和一个模拟开关控制LED照明在移动手机（翻盖）三种形式。Maxim>AppNotes>SWITCHESANDMULTIPLEXERSKeywords:mobilephones,clamshellphones,whiteLEDs,keyboardilluminationSep23,2005APPLICATIONNOTE3624DrivingWhiteLEDsinClamshellPhonesAbstract:Aswitching-converterIC―designedasawhite-LEDdriver―andananalogswitchcontrolthreeformsofLEDilluminationinamobile(clamshell)phone.ThiscircuitmultiplexesthedrivetothreesetsofLEDsfoundinsideclamshellphones.Thesephonesusuallyhaveanexternaldisplaythatisilluminatedwhenanincomingtelephonecalloccurs.Oncetheclamshellisopened,theexternaldisplayilluminationisswitchedoffandthemaininternaldisplayandkeyboardilluminationareactivated.ThecircuitinFigure1isbasedaroundtheMAX1848(IC1)whiteLEDdr……

IP电话的需要，在同一条电缆上的数据和电源。48V高电压电源的需要，以减少在电缆的电压降。本应用笔记介绍了一个DC-DC升压转换器，可以提供所需的48V电源从12V电源通常在这样的系统的主机，。它提供了低电压纹波，必须防止数据错误。Maxim>AppNotes>AUTOMOTIVEKeywords:High-EfficiencyBoostConverterProvides48VforIPPhonesDec27,2001APPLICATIONNOTE911High-EfficiencyBoostConverterProvides48VforIPPhonesIPphonesrequirethatdataandpoweronthesamecable.Ahighvoltagepowersourceof48Visrequired,toreducethevoltagedropinthecable.ThisapplicationnotedescribesaDC-DCstep-upconverterthatcandelivertherequired48Vsupply,fromthe12Vsourcetypicallyavailableinthehostofsuchsystems.Itdeliverslow-voltageripple,essentialtopreventdataerrors.Isolationisprovidedbythe12Vpower-supply.Forasystemwithoneortwoports,acustom-designedDC-DCconverterismoresuitablethanpowermodules,or"bricks",sincebrickstendtobeb……

摘要：添加看门狗保护的充电器的输入电路免受损害了手机卫士，当基带处理档或停止软件的执行。Maxim>AppNotes>BATTERYMANAGEMENTMICROPROCESSORSUPERVISORCIRCUITSKeywords:mobilephones,batterycharging,microprocessorsupervisors,pulse-widthmodulation,watchdogSep16,2005protectionAPPLICATIONNOTE3623Battery-ChargerPWMInputHasWatchdogProtectionAbstract:Addingwatchdogprotectiontothecharger-inputcircuitryofamobilephoneguardsagainstdamagewhenthebasebandprocessorstallsorceasessoftwareexecution.Mobile-phonebatteriesareusuallychargedthroughaproprietarychargingalgorithminthebasebandcontroller.Thephone'schargerinputisconnectedtotheinternalbatterythroughap-channelswitchoflowon-resistance,controlledbyapulse-widthmodulation(PWM)signalfromthebasebandcontroller(Figure1).Tominimizepowerdissi……

SharpCellularPhones解决方案……

Thisarticleaboutlow-voltageICsdiscussesmanytypesoflow-voltageICs,includingvoltageregulators,dataconverters,opampsandcurrentmonitors,comparators,microprocessorsupervisors,voltagereferences,analogswitches,andinterfacetransceivers.Italsopresentinformationonpowersavingsandhowtomanageissuesrelatedtolow-voltageoperation.……