11

®

PCM2702

Play, Stop, and Detach sequence

When host finishes or aborts audio playback, the PCM2702

will stop playing after the last transmitted audio data has

been received. Figure 6 shows the operation sequence for

play, stop, and detach.

PLYBCK, SSPND, AND ZERO FLAG

PLYBCK, SSPND, and Zero flag in Figures 4, 5, and 6 are

defined as follows.

PLYBCK—while PCM audio input data is playing back,

PLYBCK (pin 10) is switched LOW.

Detach

1ms

4ms

23ms

(1024/f

SOF

SOF

SOF

SOF

SOF

SOF

Audio Data

Last Audio Data

Audio Data

V

BUS

D+/D–

PLYBCK

SSPND

ZERO

V

V

FIGURE 6. Play, Stop, and Detach.

SSPND—upon detection of a suspend state on the USB port,

SSPND (pin 11) is switched LOW.

ZERO—if the PCM audio input data is continuously zero

to HIGH.

TEST PINS

The PCM2702 has four test pins—TEST0 (pin 16), TEST1

(pin 15), TEST2 (pin 14), and TEST3 (pin 13)—which are

used solely for testing at the factory. These pins must be

connected to a digital ground for proper operation.

XTI

V

DGNDC

V

DD

DGND

D+

D–

V

BUS

DGNDU

PLYBCK

SSPND

ZERO

TEST3

TEST2

XTO

V

AGNDP

V

AGNDL

V

V

CC

V

COM

AGND

V

AGNDR

V

TEST0

TEST1

1

2

3

4

5

6

7

8

9

10

11

12

13

14

28

27

26

25

24

23

22

21

20

19

18

17

16

15

PCM2702

R

2

R

3

R

4

X

1

12MHz

C

2

C

1

C

3

+3.3V

+5V

C

4

C

6

C

8

C

7

C

5

USB Series

“B” Connector

POST

LPF

L-Channel

POST

LPF

R-Channel

+

1

C

9

FIGURE 7. Typical Connection Diagram.