PCM2901

PCM2903

SLES034B − MARCH 2002 − REVISED JUNE 2004

www.ti.com

8

PCM2903 Terminal Functions

TERMINAL

I/O

DESCRIPTIONS

NAME

PIN

I/O

DESCRIPTIONS

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

DIN

24

I

S/PDIF input(5)

DOUT

25

O

S/PDIF output

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(6)

SEL1

9

I

Connected to the USB port of VBUS(6)

SSPND

28

O

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

VBUS

3

−

Must be connected to VDD

VCCC

10

−

Analog power supply for codec(4)

VCCP1

17

−

Analog power supply for PLL(4)

VCCP2

19

−

Analog power supply for PLL(4)

VCCX

23

−

Analog power supply for oscillator(4)

VCOM

14

−

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

VDD

27

−

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 has no connection with the internal DAC or ADC directly. See the Interface #3 and End-Points sections.

(4) Connect a decouple capacitor to GND

(5) 3.3-V CMOS level input with internal pulldown, 5 V tolerant

(6) TTL Schmitt trigger, 5 V tolerant