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1、VersatileWaveformGeneratorOperatesfrom0.1Hzto20MHzAsasingle-chipsourceofhigh-frequencywaveforms,theMAX038canservebothasthecoreofamoderate-performancewaveformgenerator,andasacard-levelwaveformsourceforelectronicsystemsinwhichthecostofadedicatedwaveformg
2、eneratormaybeprohibitive.TheMAX038isaprecision,high-frequencyfunctiongeneratorthatproducesaccuratesine,square,triangle,sawtooth,andpulsewaveformswithaminimumofexternalcomponents.Theinternal2.5Vreference(plusanexternalcapacitorandpotentiometer)letsyouva
3、rythesignalfrequencyfrom0.1Hzto20MHz.Anapplied±2.3Vcontrolsignalvariesthedutycyclebetween10%and90%,enablingthegenerationofsawtoothwaveformsandpulse-widthmodulation.Asecondfrequency-controlinput-usedprimarilyasaVCOinputinphase-locked-loopapplications-pr
4、ovides±70%offinecontrol.Thiscapabilityalsoenablesthegenerationoffrequencysweepsandfrequencymodulation.Thefrequencyandduty-cyclecontrolshaveminimalinteractionwitheachother.Alloutputamplitudesare2Vp-p,symmetricalaboutground.Thelow-impedanceoutputterminal
5、deliversasmuchas±20mA,andatwo-bitcodeappliedtotheTTL-compatibleA0andA1inputsselectsthesine,square,ortriangleoutputwaveform:TosynchronizeMAX038operationwithotherdevicesinthesystem,theinternaloscillatorproducesaTTL-compatibleSYNCoutput,whosedutycyclerema
6、insconstantat50%regardlessofthedutycyclesetfortheoutputwaveform.TheMAX038'sinternalphasedetectorenablessuchsynchronizationaswell.Italsoenablesthedemodulationoffrequency-modulatedsignals.DetailsofOperationByalternatelycharginganddischarginganexternalcap
7、acitor,theMAX038'srelaxationoscillatorproducessimultaneoussquareandtrianglewaves.Aninternalsine-shapingcircuitconvertsthetriangletoalow-distortion,constant-amplitudesinewave.Thesine,square,andtrianglewavesareappliedtoaninternalmultiplexerthatletsyousel
8、ecttheoutputwaveformaccordingtothestateofaddresslinesA0andA1.Theoutputamplituderemainsconstantat±1Vregardlessofwaveshapeorfrequency(Figure1).Figure1.AmongwaveformsavailableattheMAX038outputarethesine(a,b),triangle(c,d),andsquare(e,f).Se
