机械电子专业毕业设计英文翻译Word文档格式.docx
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机械电子专业毕业设计英文翻译Word文档格式.docx
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Thesetransceiversdrawbetween120μAand500μAofsupplycurrentwhenunloadedorfullyloadedwithdisableddrivers.Additionally,theMAX481,MAX483,andMAX487havealow-currentshutdownmodeinwhichtheyconsumeonly0.1μA.Allpartsoperatefromasingle5Vsupply.Driversareshort-circuitcurrentlimitedandareprotectedagainstexcessivepowerdissipationbythermalshutdowncircuitrythatplacesthedriveroutputsintoahigh-impedancestate.Thereceiverinputhasafail-safefeaturethatguaranteesalogic-highoutputiftheinputisopencircuit.TheMAX487andMAX1487featurequarter-unit-loadreceiverinputimpedance,allowingupto128MAX487/MAX1487transceiversonthebus.Full-duplexcommunicationsareobtainedusingtheMAX488–MAX491,whiletheMAX481,MAX483,MAX485,MAX487,andaredesignedforhalf-duplexapplications.
Applications
Low-PowerRS-485Transceivers
Low-PowerRS-422Transceivers
LevelTranslators
TransceiversforEMI-SensitiveApplications
Industrial-ControlLocalAreaNetworks
Features
InμMAXPackage:
Smallest8-PinSO
Slew-RateLimitedforError-FreeData
Transmission(MAX483/487/488/489)
0.1μALow-CurrentShutdownMode(MAX481/483/487)
LowQuiescentCurrent:
120μA(MAX483/487/488/489)、230μA(MAX1487)、300μA(MAX481/485/490/491)
-7Vto+12VCommon-ModeInputVoltageRange
Three-StateOutputs
30nsPropagationDelays,5nsSkew
(MAX481/485/490/491/1487)
Full-DuplexandHalf-DuplexVersionsAvailable
OperatefromaSingle5VSupply
Allowsupto128TransceiversontheBus
(MAX487/MAX1487)
Current-LimitingandThermalShutdownfor
DriverOverloadProtection
TheMAX481/MAX483/MAX485/MAX487–MAX491andMAX1487arelow-powertransceiversforRS-485andRS-422communications.TheMAX481,MAX485,MAX490,MAX491,andMAX1487cantransmitandreceiveatdataratesupto2.5Mbps,whiletheMAX483,MAX487,MAX488,andMAX489arespecifiedfordataratesupto250kbps.TheMAX488–MAX491arefull-duplextransceiverswhiletheMAX481,MAX483,MAX485,MAX487,andMAX1487arehalf-duplex.Inaddition,DriverEnablepinsareincludedonthe(DE)andReceiverEnable(RE)MAX481,MAX483,MAX485,MAX487,MAX489,MAX491,andMAX1487.Whendisabled,thedriverandreceiveroutputsarehighimpedance.128TransceiversontheBus。
The48k,1/4-unit-loadreceiverinputimpedanceoftheMAX487andMAX1487allowsupto128transceiversonabus,comparedtothe1-unitload(12kinputimpedance)ofstandardRS-485drivers(32transceiversmaximum).AnycombinationofMAX487/MAX1487andotherRS-485transceiverswithatotalof32unitloadsorlesscanbeputonthebus.TheMAX481/MAX483/MAX485andMAX488–MAX491havestandard12kReceiverInputimpedance.
TestCircuits
DriverDCTestLoad
ReceiverTimingTestLoad
Driver/ReceiverTimingTestCircuit
DriverTimingTestLoad
MAX483/MAX487/MAX488/MAX489:
ReducedEMIandReflections
TheMAX483andMAX487–MAX489areslew-ratelimited,minimizingEMIandreducingreflectionscausedbyimproperlyterminatedcables.Figure1showsthedriveroutputwaveformanditsFourieranalysisofa150kHzsignaltransmittedbyaMAX481,MAX485,MAX490,MAX491,orMAX1487.High-frequencyharmonicswithlargeamplitudesareevident.Figure13showsthesameinformationdisplayedforaMAX483,MAX487,MAX488,orMAX489transmittingunderthesameconditions.Figure2’shigh-frequencyharmonicshavemuchloweramplitudes,andthepotentialforEMIissignificantlyreduced.
Figure1DriverOutputWaveformandFFTPlotofMAX481/
MAX485/MAX490/MAX491/MAX1487Transmittinga150kHz
Signal
Figure2.DriverOutputWaveformandFFTPlotofMAX483/
MAX487–MAX489Transmittinga150kHzSignal
Low-PowerShutdownMode
(MAX481/MAX483/MAX487)
Alow-powershutdownmodeisinitiatedbybringingbothREhighandDElow.Thedeviceswillnotshutdownunlessboththedriverandreceiveraredisabled.Inshutdown,thedevicestypicallydrawonly0.1μAofsupplycurrent.REandDEmaybedrivensimultaneously;
thepartsareguaranteednottoentershutdownifREishighandDEislowforlessthan50ns.Iftheinputsareinthisstateforatleast600ns,thepartsareguaranteedtoentershutdown..
FortheMAX481,MAX483,andMAX487,thetZHandtZLenabletimesassumethepartwasnotinthelow-powershutdownstate(theMAX485/MAX488–MAX491andMAX1487cannotbes
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