Typical Circuit Connection 2 (Example of Remote Headphone)

VOLUME+

ExternalROM

(3)

(Optional)

SDA

VBUS

D+

GND

SCL

USB ’B’

Connector

D–

C8

R1

SUSPEND

R7

R8

Headphone

31

30

29

28

27

32

26

PGND

VCCP

(3)

HOST

(2)

FUNC3

FUNC0

HID0/MS

HID1/MC

HID2/MD

PCM2706PJT

25

23

22

21

20

19

24

18

17

10

11

12

13

14

91

5

16

2

3

4

5

6

1

7

8

VBUS

D+

D–

VDD

DGND

FUNC1

FUNC2

DOUT

C5

+

C6

C3

C4

X1

C1

C2

R11

+

C9

+

C10

R9

R10

C11

R5

C12

R6

C7

R2

R3

R4

PLAY/PAUSE

NEXT TRACK

MUTE

VOLUME–

PREVIOUSTRACK

STOP

PCM2704

,, PCM2705

PCM2706, PCM2707

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

Figure 33 illustrates a typical circuit connection for a bus-powered, 100-mA headphone with seven HIDs.

NOTE: X1: 12-MHz crystal resonator. C1, C2: 10-pF to 33-pF capacitors (depending on load capacitance of crystal resonator). C3-C5, C7, C8:

1-

µF ceramic capacitors. C

6: 10-µF electrolytic capacitor. C9, C10: 100-µF electrolytic capacitors (depending on required frequency response).

C11, C12: 0.022-µF ceramic capacitors. R1: 1 MΩ resistor. R2, R11: 1.5 kΩ resistors. R3, R4: 22 Ω resistors. R5, R6: 16 Ω resistors. R7-R10: 3.3

k

Ω resistors.

(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 33. Bus-Powered Application

NOTE:

The circuit illustrated in Figure 33 is for information only. The entire board design

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

Copyright © 2003–2009, Texas Instruments Incorporated

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