Typical Circuit Connection 1 (Example of USB Speaker)

TEST0

XTO

28

27

26

25

24

23

22

21

20

19

1

2

3

4

5

6

7

8

9

10

PCM2704DB

CK

DT

PSEL

(2)

DOUT

DGND

VDD

D–

D+

VBUS

SSPND

HOST

(2)

XTI

TEST1

HID2/MD

PGND

VCCP

(3)

HID0/MS

HID1/MC

ExternalROM

(3)

(Optional)

SCL

11

12

13

14

ZGND

AGNDL

VCCL

VOUT L

(1)

18

17

16

15

AGNDR

VCCR

VOUTR

(1)

VCOM

R9

C4

D–

D+

GND

R1

C2

X1

C1

SDA

S/PDIFOUT

C7

R2

USB ’B’

Connector

VBUS

C3

R3

R4

C6

SUSPEND

C5

+

C8

+

C9

+

C10

C11

R5

C12

R6 R7

R8

TPA200X

Power

Amp

VOLUME–

VOLUME+

MUTE

C13

+

C14

+

PCM2704

,, PCM2705

PCM2706, PCM2707

SLES081F – JUNE 2003 – REVISED JANUARY 2009....................................................................................................................................................... www.ti.com

Figure 32 illustrates a typical circuit connection for an internal-descriptor, bus-powered, 500-mA application.

NOTE: X1: 12-MHz crystal resonator. C1, C2: 10-pF to 33-pF capacitor (depending on load capacitance of crystal resonator). C3-C7: 1-µF

ceramic capacitor. C8: 10-µF electrolytic capacitor. C9, C10: 100-µF electrolytic capacitor (depending on tradeoff between required frequency

response and discharge time for resume). C11, C12: 0.022-µF ceramic capacitor. C13, C14: 1-µF electrolytic capacitor. R1: 1 MΩ resistor. R2,

R9: 1.5 kΩ resistors. R3, R4: 22 Ω resistors. R5, R6: 16 Ω resistors. R7, R8: 330 Ω resistors (depending on tradeoff between required THD

performance and pop-noise level for suspend).

(1) Output impedance of VOUTL and VOUTR during suspend mode or lack of power supply is 26 kΩ ±20%, which is the discharge path for C9

and C10.

(2) Descriptor programming through external ROM is only available when PSEL and HOST are high.

(3) External ROM power can be supplied from VCCP, but any other active component must not use VCCP, VCCL, VCCR, or VDD as a power

source.

Figure 32. Bus-Powered Application

NOTE:

The circuit illustrated in Figure 32 is for information only. The entire board design

should be considered to meet the USB specification as a USB-compliant product.

28

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