PCM2704CDB datasheet(24/53 Pages) TI2

24 / 53 page

Ready for Setup

Ready for Playback

0 V

D+ / D-

SSPND

OUT

2.0 V (typ)

Bus Idle

Bus Reset

Set Configuration

SOF

First Audio Data

SOF

Second Audio Data

3.3 V (typ)

BPZ

1 ms

Device Setup

700 s

Internal Reset

PCM2704C, PCM2705C, PCM2706C, PCM2707C

SBFS036B – MAY 2015 – REVISED AUGUST 2015

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9.3.10 USB Host Interface Sequence

9.3.10.1 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 setup 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 in 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. Figure 30 shows the initial operation sequence for

the device.

Figure 30. Initial Sequence

9.3.10.2 Play, Stop, and Detach Sequence

When the host finishes or aborts playback, the PCM2704C/5C/6C/7C stop playing after the last audio data output

is complete. Figure 31 shows the play, stop, and detach sequence.

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Product Folder Links: PCM2704C PCM2705C PCM2706C PCM2707C

PCM2704CDB Datasheet(PDF) 24 Page - Texas Instruments