C371346_375F2440A66FD1C882296D07948AE54C.pdf - 第5页

CM108AH

Highly Integrated USB Audio I/O Controller

www.cmedia.com.tw

 Host-side data loss noise-reduction function

 Embedded 16-bit ADC input with microphone boost

 Embedded power-on reset block

 Embedded 5V to 3.3V regulator for single external 5V operation

 Compatible with Win XP/Vista/7/8, Linux and Mac OS X without additional drivers (WinCE/Win Mobile are

supported by C-Media’s proprietary driver)

 48-pin LQFP package

CM108AH

Highly Integrated USB Audio I/O Controller

www.cmedia.com.tw

3 Pin Descriptions

3.1 Pin Assignment by Pin Number

Pin #

Signal Name

Pin #

Signal Name

Pin #

Signal Name

Pin #

Signal Name

1

SPDIFO

13

GPIO3

25

VBIAS

37

REGV

2

DI

14

DVSS1

26

VREF

38

MSEL

3

DO

15

GPIO4

27

MICIN

39

VOLUP

4

SK

16

SDIN

28

N.C.

40

PDSW

5

CS

17

ADSCLS

29

AVDD1

41

USBDP

6

MUTER

18

MUTEP

30

LOL

42

USBDM

7

PWRSEL

19

ADLRCK

31

LOBS

43

GPIO1

8

XI

20

ADMCLK

32

LOR

44

SDOUT

9

XO

21

LEDR

33

AVSS2

45

DAMCLK

10

MODE

22

ADSEL

34

AVDD2

46

DALRCK

11

N.C.

23

TEST

35

DVDD

47

DASCLK

12

LEDO

24

AVSS1

36

DVSS2

48

VOLDN

3.2 Pin-Out Diagram

CM108AH

SPDIFO

DI

DO

SK

CS

MUTER

PWRSEL

XI

XO

MODE

N.C.

LEDO

DVSS2

DVDD

AVDD2

AVSS2

LOR

LOBS

LOL

AVDD1

N.C.

MICIN

VREF

VBIAS

GPIO3

DVSS1

GPIO4

SDIN

ADSCLK

MUTEP

ADLRCK

ADMCLK

LEDR

ADSEL

TEST

AVSS1

VOLDN

DASCLK

DALRCK

DAMCLK

SDOUT

GPIO1

USBDM

USBDP

PDSW

VOLUP

MSEL

REGV

1

13

25

37

Pin Assignments (top view)

CM108AH

Highly Integrated USB Audio I/O Controller

www.cmedia.com.tw

3.3 Pin Signal Descriptions

Pin #

Symbol

Type

Description

1

SPDIFO

DO, 8mA, SR

SPDIF output

2

DI

DIO, 8mA,

PD, 5VT

EEPROM interface data read from EEPROM

3

DO

DO, 4mA, SR

EEPROM interface data write to EEPROM

4

SK

DO, 4mA, SR

EEPROM interface clock

5

CS

DO, 4mA, SR

EEPROM interface chip select

6

MUTER

DI, ST, PU

Mute recording (edge trigger with de-bouncing)

7

PWRSEL

DI, ST

Chip power select pin, worked by MODE Pin

Speaker mode – H: 100mA self-powered

L: 500mA Bus-powered

Headset mode – H: 100mA Bus-powered,

L: 500mA Bus-powered

(H: push up to 3.3V, L: push down to ground)

8

XI

DI

Input pin for 12MHz oscillator

9

XO

DO

Output pin for 12MHz oscillator

10

MODE

DI, ST

Operating mode selection

H: speaker mode - playback only

L: headset mode - playback & recording

(H: push up to 3.3V, L: pull down to ground)

11

N.C.

12

LEDO

DO, SR, 8mA

LED operation light: output H for power on, toggling for data transmit

13

GPIO3

DIO, 8mA,

PD, 5VT

GPIO pin

14

DVSS1

P

Digital ground

15

GPIO4

DIO, 8mA,

PD, 5VT

GPIO pin

16

SDIN

DIO, 8mA,

PD, 5VT

ADC I2S data input

17

ADSCLK

DIO, 4mA, SR

ADC I2S serial clock

18

MUTEP

DI, ST, PU

Mute playback (edge trigger with de-bouncing)

19

ADLRCK

DO, 4mA, SR

ADC I2S left/right clock

20

ADMCLK

DIO, 4mA, SR

11.2896MHz output for 44.1KHz sampled data and

12.288MHz output for 48KHz sampled data

21

LEDR

DO, SR, 8mA

LED for mute recording indicator, output H when recording is muted

22

ADSEL

DI, ST, PD

ADC input source select pin

H: use external (via I2S) ADC

L: use internal ADC

(H: push up to 3.3V, L: push down to ground)

23

TEST

DI, ST, PD

Test mode select pin,

H: test mode

L: normal operation

(H: push up to 3.3V, L: push down to ground)

24

AVSS1

P

Analog ground

25

VBIAS

AO

Microphone bias voltage supply (4.5V), with small driving capability

26

VREF

AO

Connecting to external decoupling capacitor for embedded bandgap

circuit, 2.25V output

27

MICIN

AI

Microphone input

28

N.C.

29

AVDD1

P

5V analog power for analog circuit

30

LOL

AO

Line out: left channel

31

LOBS

AO

DC 2.25V output for line out bias

32

LOR

AO

Line out: right channel

33

AVSS2

P

Analog ground