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3.5OperationalSequenceandIndicators
4SystemInterfaces
4.1PowerSupply(PSU)Interface(PVDDandGND)
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SystemInterfaces
•Afterconnectingthepowersupplyandturningiton,thepowersupplycurrentmustbe~50mA.The
amplifierresetLEDmustbeon.
–ThePVDDand3.3-VLEDsmustbeon.Ifnot,checktheconnectionstothepowersupply.
•ConnecttheSPDIFcable,eitheropticalorcoaxial,toanSPDIFsource.
•ConnecttheUSBcableandtheUSBLED(blueLEDmustbeon).
–TheEVMmustenumeratewithouttheinstallationofaUSBdriver;itisaWindows™audioclass
device.
•StarttheGUI.(ItmustnotgiveanindicationofCOMMUNICATIONERROR).
–C:\ProgramFiles\TexasInstrumentsInc\TAS5086GUI
•Loadtheconfigurationfile.
–(File,Load,ConfigFile,TAS5102EVMConfiguration.cfg)
–TheAMPRESETLEDmustgooff.
–Thepowersupplycurrentmustbe~100mA.
–Thisindicatesthattheamplifierisswitchingandreadyforaudioinput.
–TheSPDIFindicatormustbeon(blueLED),whenlockedtoavalidsourceofSPDIF.
•Iftheprecedingconditionsaremet,theEVMsystemisreadytoacceptaudiodata.
–Note:ThedefaultgainsettingoftheTAS5086GUIis0dB.Ifyouareconnectingdirectlyfroma
musicsource(CDplayer)forinputandspeakersforoutput,youmaywanttousethevolume
controlfunctionofGUItoreducethegainbeforetheprogrammaterialisstarted.
ThissectiondescribestheTAS5102/3EVMboardinregardstopowersuppliesandsysteminterfaces.
TheTAS5102/3EVMmodulemustbepoweredfromawell-regulatedexternalpowersupply.Goodaudio
performancerequiresastabilizedpowersupplywithlowripplevoltageandlowoutputimpedance.
Note:Thelengthofpowersupplycablemustbeminimized.IncreasingthelengthofthePSUcable
isequaltoincreasingthedistortionfortheamplifierathighoutputlevelsandlow
frequencies.
Maximumoutputstagesupplyvoltagedependsofthespeakerloadresistance.Fortherecommended
maximumsupplyvoltage,seetheTAS5102/3datasheet(SLLS801).
Table3.RecommendedSupplyVoltages
VoltageLimitations
DescriptionCurrentRecommendations
(8-ΩLoad)
Outputstagepowersupply8V–23V5A
SLLU106–August2008TAS5102EVMandTAS5103EVMfortheTAS5102andTAS5103DigitalAmplifierPowerOutputStages9
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