Texas Instruments DEM-DAI3793A Stereo Receiver User Manual


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5.2MasterModewithAudioPrecisionSYS-2722
SCKI
BCK
LRCK
DOUT
DIN
DAC
DIR:LC89052T
ADC
PCM3793A
Daughtercard#2 Daughtercard#1
DIT:DIT4096
U302
CN302
U301
CN301
SW301
SW001
Clock
Manager
AudioInterface
Isolatedby
CN305
MasterModewithAudioPrecisionSYS-2722
ToenabletheDEM-DAI3793A/3794AEVMmotherboardforuseinMastermode,thepathoftheS/PDIF
inputtothePCM3793AthroughDIRisnotavailableforuse.LRCKandBCKchangetherespectiveoutput
statesatthePCM3793Asideinmastermode;therespectivejumpersofR-BCK,R-LRCK,andRX-DATA
shouldberemovedfromCN305toavoidconflictbetweentheinputandoutputoftheseclocks.
Furthermore,inthissituation,DINtothePCM3793AisalsoinvalidbecauseDIRLC89052Tdoesnot
receiveclocks(LC89052Tcannotworkinslavemode).Therefore,anyanalogoutputfromtheDACis
invalidbecausethereisnodatainput.
However,inthisconfiguration,userscanconfirmmastermodeoperationofbothLRCKandBCKfrom
PCM3793Awithadigitaloscilloscope.Userscaneasilyidentifymastermodewithouttheuseofother
externalequipmentsuchasthePSIA-2722analyzer.
ThePCM3793AhasnointegratedinternalPLL.However,theclockmanagerfunctioncanprovideLRCK
(f
S
)andBCKinmastermode,asdescribedinFigure5-3.
Figure5-3.MasterModeConfigurationWithSYS-2722
RefertothejumpercombinationshowninFigure5-4toputtheDEM-DAI3793A/3794AEVMmotherboard
intomastermodeconfiguration.
52EvaluationandMeasurementsSBAU127–July2007
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