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A.2.1RegisterControlwithDSPInterface
A.3PackageInformation
PackageInformation
TableA-2summarizestherecommendedpower-onsequenceforthePCM3793A.Theshadedcellswithin
thetableindicatespecificregistersettingsthatmustbeconfiguredforthedevicetoproperlyoperatewith
aDSPinterface.
TableA-2.RecommendedPower-OnSequenceforPCM3793A
REGISTER
STEPSETTINGSNOTE
1–Turnonallpowersupplies.
(1)
24027hHeadphoneamplifierL-chvolume(–6dB)
(2)
34127hHeadphoneamplifierR-chvolume(–6dB)
(2)
44227hSpeakeramplifierL-chvolume(–6dB)
(2)
54327hSpeakeramplifierR-chvolume(–6dB)
(2)
64427hDigitalattenuatorL-ch(–24dB)
(2)
74527hDigitalattenuatorR-ch(–24dB)
(2)
8
(3)
4620hDACaudiointerfaceformat(left-justified)
(4)
94BC0hHeadphonedetectionenableandinvertingpolarity.Shortandthermaldetectionenable.
10
(3)
5102hADCaudiointerfaceformat(left-justified)
(4)
115A10hV
COM
rampup/downtimecontrol.PG1,PG2gaincontrol(0dB)
12
(5)
49E0hDAC(DAL,DAR)andanalogbiaspowerup
13
(5)
5601hZero-crossdetectionenable
144803hAnalogmixer(MXL,MXR)powerup
155811hAnalogmixerinput(SW2,SW5)select
1649FChHeadphoneamplifier(HPL,HPR,HPC)powerup
174C03hSpeakeramplifiershutdownrelease
184A01hV
COM
powerup
19523FhAnalogfrontend(ADL,ADR,D2S,MCB,PG1,2,5,6)powerup
205711hAnaloginput(MUX3,MUX4)select.Analoginput(MUX1,MUX2)select
214F0ChAnaloginputL-ch(PG3)volume(0dB)
(2)
22500ChAnaloginputR-ch(PG4)volume(0dB)
(2)
23–Anysettingsforotherdevicesorwaittime,450ms
(6)(7)
2449FFhSpeakeramplifier(SPL,SPR)powerup
(5)
(1)
V
DD
shouldbeturnonpriortoorsimultaneouslywiththeotherpowersupplies.Itisrecommendedtosetregisterdatawiththe
systemclockinputafterturningallpowersupplieson.
(2)
Anylevelisacceptableforvolumeorattenuation.Levelshouldberesumedbyregisterdatarecordedwhensystempoweroff.
(3)
I
2
S:4620h;Left-Justified:4601h;Right-Justified:4602h;DSP:4603h.
(4)
AudiointerfaceformatshouldbesettomatchtheDSPordecoderbeingused.
(5)
Betweensteps12and13,addthisvalueforslaveconfiguration:5400h.Formasterconfiguration,add:5440h.
(6)
ThePCM3793ArequirestimeforV
COM
toreachthecommonlevelfromGNDlevel.Thedelaydependsonthecapacitorvalue
forV
COM
andthesettingofregister125PTM[1:0],RES[4:0].Thedefaultsettingis450msatV
COM
=4.7μs.
(7)
ThePCM3794Adoesnotrequirethissettingbecauseithasnospeakeroutput.
Packaginginformationincludesathermalpadmechanicaldrawingandanexampleboardlayout.These
examplesaretakenfromthePCM3793Aproductdatasheet(availablefordownloadatwww.ti.com).
SBAU127–July2007Reference.csvFiles,InterfacingtoDSPs,andPackageInformation99
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