PCM2904

PCM2906

SLES042A − JUNE 2002 − REVISED JUNE 2004

www.ti.com

6

PCM2904 Terminal Functions

TERMINAL

I/O

DESCRIPTION

NAME

NO.

I/O

DESCRIPTION

AGNDC

11

−

Analog ground for codec

AGNDP

18

−

Analog ground for PLL

AGNDX

22

−

Analog ground for oscillator

D–

2

I/O

USB differential input/output minus(1)

D+

1

I/O

USB differential input/output plus(1)

DGND

26

−

Digital ground

DGNDU

4

−

Digital ground for USB transceiver

HID0

5

I

HID key state input (mute), active high(3)

HID1

6

I

HID key state input (volume up), active high(3)

HID2

7

I

HID key state input (volume down), active high(3)

SEL0

8

I

Must be set to high(5)

SEL1

9

I

Must be set to high(5)

SSPND

28

O

Suspend flag, active low (Low: suspend, High: operational)

TEST0

24

I

Test pin, must be connected to GND

TEST1

25

O

Test pin, must be left open

VBUS

3

−

Connect to USB power (VBUS)

VCCCI

10

−

Internal analog power supply for codec(4)

VCCP1I

17

−

Internal analog power supply for PLL(4)

VCCP2I

19

−

Internal analog power supply for PLL(4)

VCCXI

23

−

Internal analog power supply for oscillator(4)

VCOM

14

−

Common for ADC/DAC (VCCCI/2) (4)

VDDI

27

−

Internal digital power supply(4)

VINL

12

I

ADC analog input for L-channel

VINR

13

I

ADC analog input for R-channel

VOUTL

16

O

DAC analog output for L-channel

VOUTR

15

O

DAC analog output for R-channel

XTI

21

I

Crystal oscillator input(2)

XTO

20

O

Crystal oscillator output

(1) LV-TTL level

(2) 3.3-V CMOS-level input

(3) 3.3-V CMOS-level input with internal pulldown. This pin informs the PC of serviceable control signals such as mute, volume up, or volume down,

which have no direct connection with the internal DAC or ADC. See the Interface #3 and End-Points sections.

(4) Connect a decoupling capacitor to GND.

(5) TTL Schmitt trigger, 5-V tolerant