Texas Instruments PCM2706 Evaluation Module PCM2706EVM-U PCM2706EVM-U Datenbogen
Produktcode
PCM2706EVM-U
Ready for Setup
Ready for Playback
V
DD
0 V
D+ / D-
SSPND
V
L
V
R
OUT
OUT
2.0 V (typ)
Bus Idle
Bus Reset
Set Configuration
SOF
First Audio Data
SOF
SOF
Second Audio Data
3.3 V (typ)
BPZ
1 ms
Device Setup
700 s
m
Internal Reset
SBFS036A – AUGUST 2011 – REVISED JULY 2012
USB Host Interface Sequence
Power-On, Attach, and Playback Sequence
The PCM2704C/5C/6C/7C are ready for setup when the reset sequence has finished and the USB bus is
attached. After a connection has been established (through the set-up process), the PCM2704C/5C/6C/7C are
ready to accept USB audio data. While waiting for the audio data (that is, the device is in an idle state), the
analog output is set to bipolar zero (BPZ).
attached. After a connection has been established (through the set-up process), the PCM2704C/5C/6C/7C are
ready to accept USB audio data. While waiting for the audio data (that is, the device is in an idle state), the
analog output is set to bipolar zero (BPZ).
Upon receiving the audio data, the PCM2704C/5C/6C/7C stores the first audio packet into the internal storage
buffer. The packet contains 1 ms of audio data. The PCM2704C/5C/6C/7C start playing the audio data after
detecting the next subsequent start-of-frame (SOF) packet.
buffer. The packet contains 1 ms of audio data. The PCM2704C/5C/6C/7C start playing the audio data after
detecting the next subsequent start-of-frame (SOF) packet.
shows the initial operation sequence for
the device.
Figure 31. Initial Sequence
28
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