PCM2704,PCM2705

PCM2706,PCM2707

SLES081A − JUNE 2003 – REVISED MAY 2004

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27

TYPICAL CIRCUIT CONNECTION 1 (EXAMPLE OF USB SPEAKER)

Figure 31 illustrates a typical circuit connection for an internal-descriptor, bus-powered, 500-mA application.

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

DOUT

DGND

VDD

D–

D+

VBUS

SSPND

HOST

XTI

TEST1

HID2/MD

PGND

VCCP

HID0/MS

HID1/MC

External ROM

(Optional)

SCL

11

12

13

14

ZGND

AGNDL

VCCL

VOUTL

18

17

16

15

AGNDR

VCCR

VOUTR

VCOM

R9

C4

D–

D+

GND

R1

C2

X1

C1

SDA

S/PDIF OUT

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

+

Notes:

X1: 12-MHz crystal resonator

C1, C2: 10-pF to 33-pF (depending on load capacitance of crystal resonator)

C3, C4, C5, C6, C7: 1-µF ceramic

C8: 47-µF electrolytic

C9, C10: 100-µF electrolytic (depending on tradeoff between required frequency response and discharge time for resume)

C11, C12: 0.022-µF ceramic

C13, C14: 1-µF electrolytic

R1: 1 MW

R2, R9: 1.5 kW

R3, R4: 22 W

R5, R6: 16 W

R7, R8: 330 W (depending on tradeoff between required THD performance and pop-noise level for suspend)

Output impedance of VOUTL and VOUTR during suspend mode or lack of power supply is 26 kW ±20%, which is the discharge path for C9 and C10.

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 31. Bus-Powered Application

Note that the circuit illustrated above is for information only. Whole-board design should be considered to meet the

USB specification as a USB-compliant product.