Maxim MAX19994A双路RF下变换方案

MaximMAX19994A双路RF下变换方案Maxim公司的MAX19994A是双路RF下变换器,RF范围从1200MHz到2000MHz,LO范围从1450MHz到2050MHz,IF范围从50MHz到500MHz,典型的转换增益为8.4dB,典型的噪音为9.8dB,输入IP3典型值为+25dBm,输入1dB压缩点为+14dBm,单电源5.0V或3.3V工作,主要用在WCDMA/LTE,TD-SCDMA,GSM/EDGE和cdma2000M无线基站,无线本地回路(WLL),固定宽带无线接入,私人移动电台和军用系统.本文介绍MAX19994A主要特性,功能方框图,以及典型应用电路图和所用元件表.

TheMAX19994Adual-channeldownconverterisdesignedtoprovide8.4dBofconversiongain,+25dBminputIP3,+14dBm1dBinputcompressionpoint,andanoisefigureof9.8dBfor1200MHzto2000MHzdiversityreceiverapplications.WithanoptimizedLOfrequencyrangeof1450MHzto2050MHz,thismixersupportsbothhigh-andlow-sideLOinjectionarchitecturesforthe1200MHzto1700MHzand1700MHzto2000MHzRFbands,respectively.

Inadditiontoofferingexcellentlinearityandnoiseperformance,thedevicealsoyieldsahighlevelofcomponentintegration.Thisdeviceincludestwodouble-balancedpassivemixercores,twoLObuffers,adual-inputLOselectableswitch,andapairofdifferentialIFoutputamplifiers.Integratedon-chipbalunsallowforsingleendedRFandLOinputs.TheMAX19994ArequiresanominalLOdriveof0dBmandatypicalsupplycurrentof330mAatVCC=5.0V,or264mAatVCC=3.3V.

TheMAX19994AispincompatiblewiththeMAX9985/MAX9995/MAX19985A/MAX19993/MAX19995/MAX19995Aseriesof700MHzto2500MHzmixersandpinsimilarwiththeMAX19997A/MAX19999seriesof1850MHzto4000MHzmixers,makingthisentirefamilyofdownconvertersidealforapplicationswhereacommonPCBlayoutisusedacrossmultiplefrequencybands.

Thedeviceisavailableina6mmx6mm,36-pinthinQFNpackagewithanexposedpad.Electricalperformanceisguaranteedovertheextendedtemperaturerange,fromTC=-40NCto+85NC.

MAX19994A主要特性:

1200MHzto2000MHzRFFrequencyRange

1450MHzto2050MHzLOFrequencyRange

50MHzto500MHzIFFrequencyRange

8.4dBTypicalConversionGain

9.8dBTypicalNoiseFigure

+25dBmTypicalInputIP3

+14dBmTypicalInput1dBCompressionPoint

68dBcTypical2LO-2RFSpuriousRejectionatPRF=-10dBm

DualChannelsIdealforDiversityReceiverapplication

47dBTypicalChannel-to-ChannelIsolation

Low-6dBmto+3dBmLODrive

IntegratedLOBuffer

InternalRFandLOBalunsforSingle-EndedInputs

Built-InSPDTLOSwitchwith48dBLO-to-LOIsolationand50nsSwitchingTime

PinCompatiblewiththeMAX9985/MAX9995/MAX19985A/MAX19993/MAX19995/MAX19995ASeriesof700MHzto2200MHzMixers

PinSimilartotheMAX19997A/MAX19999Seriesof1850MHzto4000MHzMixers

Single5.0Vor3.3VSupply

ExternalCurrent-SettingResistorsProvideOptionforOperatingDeviceinReduced-Power/Reduced-PerformanceMode

MAX19994A应用:

WCDMA/LTEBaseStations

TD-SCDMABaseStations

GSM/EDGEBaseStations

cdma2000MBaseStations

WirelessLocalLoop

FixedBroadbandWirelessAccess

Pri