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PCM2903B Datasheet(PDF) 23 Page - Texas Instruments

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Part # PCM2903B
Description  STEREO AUDIO CODEC WITH USB INTERFACE, SINGLE-ENDED ANALOG INPUT/OUTPUT, AND S/PDIF
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

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INTERFACE SEQUENCE
Power On, Attach, and Playback Sequence
D+/D–
SEL1(Pin9)
2.5V(Typ)
0V
InternalReset
ReadyforSetup
Attach
(ConnecttoUSBBus)
SOF
ReadyforPlayback
BusReset
SetConfiguration
SOF
SOF
BPZ
BusIdle
3.3V (Typ)
5V=V
BUS
(Typ)
1 AudioData
st
2
AudioData
nd
V
(Pin27)
DD
SSPND
V
L
OUT
V
R
OUT
700 s
m
DeviceSetup
1ms
T0055-03
PCM2903B
www.ti.com ........................................................................................................................................................................................... SLES228 – DECEMBER 2008
The PCM2903B is ready for setup when the reset sequence has finished and the USB bus is attached. In order
to perform certain reset sequences defined in the USB specification, VDD, VCCC, VCCP1, VCCP2, and VCCX must rise
up within 10 ms / 3.3 V. After connection has been established by setup, the PCM2903B 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 PCM2903B stores the first audio packet, which contained 1-ms audio data,
into the internal storage buffer. The PCM2903B starts playing the audio data when detecting the next start of
frame (SOF) packet, as illustrated in Figure 35 and Figure 36.
Figure 35. Attach After Power On
Copyright © 2008, Texas Instruments Incorporated
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