ADI ADF4355微波宽带546800 MHz频率合成器解决方案设计.docx
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ADIADF4355微波宽带546800MHz频率合成器解决方案设计
ADIADF4355微波宽带(54-6800MHz)频率合成器解决方案
ADI公司的ADF4355是微波宽带(54-6800MHz)可实现小数N分频或整数N分频锁相环(PLL)的频率合成器,高分辨率38位模数,低相位噪声电压控制振荡器(VCO),可编程1/2/4/8/16/32/64分频输出,模拟和数字电源为3.3V,主要用在无线基础设施(W-CDMA,TD-SCDMA,WiMAX,GSM,PCS,DCS,DECT),点到点/点到多点微波链路,卫星/VSAT,测试设备/仪器仪表和时钟产生.本文介绍了ADF4355主要特性,框图和几种应用电路,以及评估板EV-ADF4355SD1Z主要特性,电路图,材料清单和PCB设计图.
TheADF4355allowsimplementationoffractional-Norinteger-Nphase-lockedloop(PLL)frequencysynthesizerswhenusedwithanexternalloopfilterandanexternalreferencefrequency.Aseriesoffrequencydividerspermitsoperationfrom54MHzto6800MHz.
TheADF4355hasanintegratedVCOwithafundamentaloutputfrequencyrangingfrom3400MHzto6800MHz.Inaddition,theVCOfrequencyisconnectedtodivideby1,2,4,8,16,32,or64circuitsthatallowtheusertogenerateRFoutputfrequenciesaslowas54MHz.Forapplicationsthatrequireisolation,theRFoutputstagecanbemuted.Themutefunctionisbothpinandsoftwarecontrollable.
Controlofallon-chipregistersisthroughasimple3-wireinterface.TheADF4355operateswithanaloganddigitalpowersuppliesrangingfrom3.15Vto3.45V,withchargepumpandVCOsuppliesfrom4.75Vto5.25V.TheADF4355alsocontainshardwareandsoftwarepower-downmodes.
ADF4355主要特性:
RFoutputfrequencyrange:
54MHzto6800MHz
Fractional-Nsynthesizerandinteger-Nsynthesizer
Highresolution38-bitmodulus
Lowphasenoise,voltagecontrolledoscillator(VCO)
Programmabledivideby1,2,4,8,16,32,or64output
Analoganddigitalpowersupplies:
3.3V
ChargepumpandVCOpowersupplies:
5.0Vtypical
Logiccompatibility:
1.8V
Programmabledualmodulusprescalerof4/5or8/9
Programmableoutputpowerlevel
RFoutputmutefunction
3-wireserialinterface
Analoganddigitallockdetect
ADF4355应用:
Wirelessinfrastructure(W-CDMA,TD-SCDMA,WiMAX,GSM,PCS,DCS,DECT)
Pointtopoint/pointtomultipointmicrowavelinks
Satellites/VSATs
Testequipment/instrumentation
Clockgeneration
图1.ADF4355功能框图
图2.ADF4355直接转换调制器电路图
图3.ADF4355功电源电路图
评估板EV-ADF4355SD1Z
TheEV-ADF4355SD1ZevaluatestheperformanceoftheADF4355frequencysynthesizerwithintegratedVCOforphase-lockedloops(PLLs).AphotographoftheevaluationboardisshowninFigure1.TheevaluationboardcontainstheADF4355frequencysynthesizerwithintegratedVCO,adifferential122.88MHzreference(TCXO),aloopfilter,aUSBinterface,powersupplyconnectors,andsubminiatureVersionA(SMA)connectors.AUSBcableisincludedtoconnecttheboardtoaPCUSBport.Foreasyprogrammingofthesynthesizer,downloadtheWindows-basedsoftwarefrom.analog./ADF4355.ThisboardrequiresanSDP-S(showninFigure1,butnotsuppliedwiththekit).TheSDP-SallowssoftwareprogrammingoftheEV-ADF4355SD1Zdevice.
评估板EV-ADF4355SD1Z主要特性:
Selfcontainedboard,includingADF4355frequency
synthesizerwithintegratedVCO,differential122.88MHz
temperaturecontrolledcrystaloscillator(TCXO),loop
filter(20kHz),USBinterface,andvoltageregulators
Windows®-basedsoftwareallowscontrolofsynthesizerfunctionsfromaPC
Externallypoweredby6V
图4.评估板EV-ADF4355SD1Z外形图
图5.评估板EV-ADF4355SD1Z电路图
(1)
图6.评估板EV-ADF4355SD1Z电路图
(2)
图7.评估板EV-ADF4355SD1Z电路图(3)
评估板EV-ADF4355SD1Z材料清单:
图8.评估板EV-ADF4355SD1ZPCB设计图
(1)
图9.评估板EV-ADF4355SD1ZPCB设计图
(2)
图10.评估板EV-ADF4355SD1ZPCB设计图(3)
图11.评估板EV-ADF4355SD1ZPCB设计图(4)
图12.评估板EV-ADF4355SD1ZPCB设计图(5)
图13.评估板EV-ADF4355SD1ZPCB设计图(6)