Datasheet

INTERFACESEQUENCE
PowerOn,Attach,andPlaybackSequence
D+/D–
2.5V(Typ)
0V
InternalReset
ReadyforSetup
SOF
ReadyforPlayback
BusReset
SetConfiguration
SOF SOF
BPZ
BusIdle
5V (Typ)
1 AudioData
st
2 AudioData
nd
V (Pin3)
BUS
SSPND
V L
OUT
V R
OUT
700 sm
DeviceSetup
1ms
T0055-02
Play,Stop,andDetachSequence
D+/D–
V L
OUT
V R
OUT
AudioDataAudioData Last AudioData
Detach
SOF SOF SOF SOF SOF
1ms
V (Pin3)
BUS
T0056-02
PCM2900B
PCM2902B
SLES229–DECEMBER2008........................................................................................................................................................................................... www.ti.com
ThePCM2900B/2902BisreadyforsetupwhentheresetsequencehasfinishedandtheUSBbusisattached.
Afterconnectionhasbeenestablishedbysetup,thePCM2900B/2902BisreadytoacceptUSBaudiodata.While
waiting,theaudiodata(idlestate)andanalogoutputaresettobipolarzero(BPZ).
Whenreceivingtheaudiodata,thePCM2900B/2902Bstoresthefirstaudiopacket,whichcontains1-msaudio
data,intotheinternalstoragebuffer.ThePCM2900B/2902Bstartsplayingtheaudiodatawhendetectingthe
nextstartofframe(SOF)packet,asillustratedinFigure32.
Figure32.InitialSequence
Whenthehostfinishesorabortsplayback,thePCM2900B/2902Bstopsplayingafterthelastaudiodatahave
played,asshowninFigure33.
Figure33.Play,Stop,andDetachSequence
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ProductFolderLink(s):PCM2900BPCM2902B
Not Recommended For New Designs