PCM2704,PCM2705

PCM2706,PCM2707

SLES081A − JUNE 2003 – REVISED MAY 2004

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29

TYPICAL CIRCUIT CONNECTION 3 (EXAMPLE OF DSP SURROUND PROCESSING AMP)

VBUS

D+

GND

USB ’B’

Connector

D–

C7

R1

SUSPEND

R8

R9

Headphone

31

30

29

28

27

32

26

PGND

VCCP

HOST

FUNC3

FUNC0

HID0/MS

HID1/MC

HID2/MD

PCM2707PJT

25

23

22

21

20

19

24

18

17

10

11

12

13

14

915

16

2

3

4

5

6

1

7

8

VBUS

D+

D–

VDD

DGND

FUNC1

FUNC2

DOUT

C5

+

C6

C3

C4

X1

C1

C2

R5

+

C8

+

C9

R10

R11

C10

R6

C11

R7

R3

R4

R12

R2

DOUT

SYSTEM CLOCK

BCK

MD

MC

MS

LRCK

DIN

TAS300X

I2S I/F Audio Device

Power

3.3 V

GND

+

Notes:

X1: 12-MHz crystal resonator

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

resonator)

C3, C4: 1-µF ceramic

C5: 0.1-µF ceramic and 10-µF electrolytic

C6, C7: 47-µF electrolytic

C8, C9: 100-µF electrolytic (depending on required frequency

response)

C10, C11: 0.022-µF ceramic

R1, R12: 1 MW

R2, R5: 1.5 kW

R3, R4: 22 W

R6, R7: 16 W

R8, R9, R10, R11: 3.3 kW

SPI host (DSP) must have responsibility to handle D+ pullup if descriptor is programmed by SPI. SPI host must not activate D+ pullup until all internal

registers have been set. D+ pullup must not be activated while detaching from host.

D+must not activate (HIGH: 3.3 V) before programming of the PCM2707 by SPI is completed.

D+must not activate (HIGH: 3.3 V) while the device is detached from the USB.

VBUS of the USB can be used to detect USB bus power status. (Note that VBUS of the USB connector is 5 V.)

Figure 33. Self-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.