一种基于AD9851芯片的DDS脉冲发生器

224200712JournalofBeijingInstituteofMachineryVol.22No.4Dec.2007:1008-1658(2007)04-0062-04AD9851DDS,(,100085):DDS(DirectDigitalSynthesize)AD9851,MSP430F169,DDSAD9851,,1Hz70MHz7,,,,,:DDS;;:TH741:AApulsegeneratorofDDSbasedonAD9851SHENGGang2bao,TENGGong2qing(DivisionofBasicCourses,BeijingInstituteofMachinery,Beijing100085,China)Abstract:InthispaperapulsegeneratorisdesignedbasedonAD9851DDS(directdigitalfrequen2cysynthesis).EmployingsinglechipcomputerMSP430F169forcontrolofAD9851,thefrequencyofoutputcanbeadjustedbychangingtheFTWORDofDDSAD9851.Thescopeoftheoutputfrequencyisfrom1Hzto70MHz.Theuseofseven2orderlow2passellipticfiltermakesthesignaldecayrapidlyinmagnitude2frequencyandtheemploymentofgaincontrolcircuitadjuststheamplitudeofthesignal.Thefrequency,phaseandamplitudeofsignalgeneratedbythegeneratorcanbeadjustedconveniently.Themodelmachineisstableinproperty,lowinpowerconsumption,smallinsizeandconvenientinutiliza2tion.Keywords:DDS;Pulsegenerator;low2passellipticfilterDDS,ADDDSAD9851,TIMSP430F169DDS,,,,,MSP430F1691DDSAD98511.1DDSDDS,,,D/A,,11DDSDDS,NNfs,K,K,,0360,:2007-10-28:(1981-),,,,GMI4:AD9851DDS,(),D/A,D/A,DDS,1.2AD9851ADAD9851,22AD9851AD9851:6,180MHz;10D/A;;32;5;2.7V5VN,FN,M,FM,30MHz,6,6,AD9851FC180MHz,(1),(2)F=FMFC/2N(1)=2FN/2M(2)22.1TIMSP430F169[1],3MSP430F16916RISC,CPU161.8V3.6V1MHz,0.1A400AFLASH,,JTAG,33,MSP430F169P4.0P4.7AD9851D0D7,AD9851,P6.3,P6.4AD9851W_CLKFQ_UDAD985130MHz,DDSAD9851,,,00.53622P6.3,P6.4,FLASH40AD9851AD9851,,VINPAD9851,VOUTP,AD9851180MHz,8MHz,172MHz,50MHz,,;,,,,DDS,,,:3dBfc50MHz,R1R2100,65MHz,Amin60dB,0.2dBAs=65MHz/50MHz=1.3,0.2,A13.9dB,Amin+A=73.9dB,7,7LCLC,:C=CZFSF(3)L=LZFSF(4)Z100,FSF=2fc,1,4,PSPISE[2]51/pFC11.23439.3C20.12173.88L21.2644.03105C31.73155.1C40.596519L40.95253.03105C51.55749.6C60.423513.5L60.98503.14105C70.999231.8475IOUT,VINPAD9851,VOUT[3],6464:AD9851DDS6MSP430F169,AD9851AD80443.3V,TPS70633,,772.2,DDS:45;6(30MHz);;8MHz(1),(2)W0-W5:W0=00100001;W1=00001011;W2=01100000;W3=10110110;W4=00001011AD985140,32,5,6,,840W_CLK8,5W_CLK,40,FQ_UD,40,DDS,W0840FLASH,P6.3,P6.4W_CLK,FQ_UD,,P440AD985183FLASHMSP430F169,,7,:[1].MSP430FLASH16[M].:,2002[2].orCADPSpiceA/DV9[M].:,2000[3],.[M]..:,200056