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PCM2902E Datasheet(PDF) 24 Page - Texas Instruments

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Part No. PCM2902E
Description  STEREO AUDIO CODEC WITH USB INTERFACE, SINGLE ENDED ANALOG INPUT/OUTPUT AND S/PDIF
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

PCM2902E Datasheet(HTML) 24 Page - Texas Instruments

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PCM2900
PCM2902
SLES035B − MARCH 2002 − REVISED JUNE 2004
www.ti.com
24
Copyright Management (PCM2902)
Isochronous-in data is affected by the serial copy management system (SCMS). Where receiving digital audio
data that is indicated as original data in the control bit, input digital audio data transfers to the host. If the data
is indicated as first generation or higher, transferred data is selected to analog input.
Digital audio data output is always encoded as original with SCMS control.
The implementation of this feature is an option for the customer. Note that it is the user’s responsibility whether
they implement this feature in their product or not.
INTERFACE SEQUENCE
Power On, Attach, and Playback Sequence
The PCM2900/2902 is ready for setup when the reset sequence has finished and the USB bus is attached. After
connection has been established by setup, the PCM2900/2902 is ready to accept USB audio data. While
waiting, the audio data (idle state) and analog output are set to bipolar zero (BPZ).
When receiving the audio data, the PCM2900/2902 stores the first audio packet, which contained 1-ms audio
data, into the internal storage buffer. The PCM2900/2902 starts playing the audio data when detecting the
following start of frame (SOF) packet.
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.)
1st Audio Data
2nd Audio Data
VBUS (Pin 3)
SSPND
VOUTL
VOUTR
700
µs
Device Setup
1 ms
Figure 32. Initial Sequence
Play, Stop, and Detach Sequence
When the host finishes or aborts the playback, the PCM2900/2902 stops playing after the last audio data has
played.
Record Sequence
The PCM2900/2902 starts the audio capture into the internal memory after receiving the SET_INTERFACE
command.


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