数字控制的正弦波发生器

数字控制的正弦波发生器Maxim>AppNotes>AutomotiveFilterCircuits(Analog)SignalGenerationCircuitsKeywords:digitallycontrolledsine-wavegenerator,sinewave,circuits,IC3Jun27,2003APPLICATIONNOTE2081DigitallyControlledSine-WaveGeneratorAsimilarversionofthisarticleappearedintheMay15,2003issueofEDNmagazine.ThecircuitofFigure1producesanaccuratevariable-frequencysinewaveforuseasageneral-purposereferencesignal.Itincludesan8th-orderelliptic,switched-capacitorlowpassfilter(IC3)thatisclockedwitha100kHzsquarewavegeneratedbymicrocontrollerIC2.(Anyotherconvenientsquarewavesourceisalsoacceptable.)Themicrocontrollerisclockedbya10MHzoscillatormodule.Avo