Datasheet

DAC
DigitalAudioInterface—S/PDIFOutput
ChannelStatusInformation
CopyrightManagement
DigitalAudioInterface—I
2
SInterfaceOutput(PCM2706/7)
LRCK
SYSCK
(256f )
S
BCK
(64f )
S
R-Channel
L-Channel
DOUT
1 1 1
1 1 1
2 2 2
2 2 2
3 3
3 3
MSB MSB MSBLSB LSB
1/f
S
14 14
14 14
15 15
15 15
16 16
16 16
DIN
T0009-04
PCM2704, ,PCM2705
PCM2706,PCM2707
www.ti.com .......................................................................................................................................................SLES081F–JUNE2003–REVISEDJANUARY2009
ThePCM2704/5/6/7hasaDACthatusesanoversamplingtechniquewith128-f
S
second-ordermultibitnoise
shaping.Thistechniqueprovidesextremelylowquantizationnoiseintheaudioband,andthebuilt-inanalog
low-passfilterremovesthehigh-frequencycomponentsofthenoise-shapingsignal.DACoutputsthroughthe
headphoneamplifierV
OUT
LandV
OUT
Rcanprovide12mWat32Ω,aswellas1.8V
PP
intoa10-kΩload.
ThePCM2704/5/6/7employsS/PDIFoutput.Isochronous-outdatafromthehostareencodedtoS/PDIFoutput
DOUT,aswellastoDACanalogoutputsV
OUT
LandV
OUT
R.InterfaceformatandtimingfollowtheIEC-60958
standard.Monauraldataareconvertedtothestereoformatatthesamedatarate.S/PDIFoutputisnot
supportedintheI
2
SI/Fenablemode.Theimplementationofthisfeatureisoptional.Notethatitisyour
responsibilitytodeterminwhethertoimplementthisfeatureinyourproductornot.
Thechannelstatusinformationisfixedasconsumerapplication,PCMmode,copyright,anddigital/digital
converter.Allotherbitsarefixedas0s,exceptforthesamplefrequency,whichissetautomaticallyaccordingto
thedatareceivedthroughtheUSB.
DigitalaudiodataoutputalwaysisencodedasoriginalwithSCMScontrol.Onlyonegenerationofdigital
duplicationisallowed.
ThePCM2706andPCM2707cansupporttheI
2
Sinterface,whichisenabledbyFSEL(pin9).IntheI
2
Sinterface
enabledmode,pins4,18,19,5,and17areassignedasDIN,SYSCK,BCK,LRCK,andDOUT,respectively.
Theyprovidedigitaloutput/inputdatainthe16-bitI
2
Sformat,whichalsoisacceptedbytheinternalDAC.I
2
S
interfaceformatandtimingareshowninFigure22,Figure23,andFigure24.
Figure22.AudioDataInterfaceFormat
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ProductFolderLink(s):PCM2704PCM2705PCM2706PCM2707
PCM2704 and PCM2705
Not Recommended For New Designs