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3.2.3.10DigitalAmplifier
3.2.4LC89052T(DIR:DigitalAudioI/FReceiver)ControlWindow
3.2.4.1AudioClock/DataControlOptions
SpeakerShortDetection,L-Ch;SpeakerShortDetection,R-Ch
Figure3-22showstheDigitalAmplifierfunction.
Figure3-22.DigitalAmplifierFunctionMenuTab
SettingtheoperatingspeedoftheClass-Dspeakeramplifierdependsontheperformancerequirements;
clickthecheckboxtoenablethisfunction.SpectrumSpreadingcontrol(withLow,Mid,orHighoptions)
andtheSwitchingfrequency(1.5MHzto3MHz)canbeselectedhere.Usingthisfeaturewillhelpreduce
EMInoise.Asthespectrumspreadingcontrolmovestohigh,theeffectwillberemarkable.Note,however,
thatthesignal-to-noiseratio(SNR)performanceofthespeakeroutputisaffectedbythisfunction.
Figure3-23illustratestheLC89052Interfaceformatchoices.
Figure3-23.LC89052InterfaceFormatSelectionOptions
Thereareseveraloptionsavailablefortheaudioclockanddatacontrolfeaturesinthe
DEM-DAI3793A/3794AEVMsoftware.
Forthesystemaudioclockcontrol,userscanselectanyoftheseoptions:
•PLLSCK:SelectsthesystemclockrateforthePCM3793A.
•XINSCKorE-SCK:SelectsthecrystaloscillatorfrequencyonDaughterCard#2
•CKOUTDiv:SelectsthedividingrateforCKOUT
Theserialaudiodataformatiscontrolledbytheotherpartofthedrop-downmenu;seeFigure3-23.
SelectthedataformatfortheDACinterfaceofthePCM3793A(itshouldmatchwiththeDACsettingon
theAudioInterfacetab).
SBAU127–July2007Set-UpGuide39
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