SSM2250

–9–

REV. 0

C7

0.1 F

C6

10 F

36

35

34

33

32

31

30

29

28

27

26

25

1

2

3

4

5

6

7

8

9

10

11

12

SSM2250

C4

10 F

+

1

2

3

4

5

6

7

NC

NC

R1

20k

NC

NC

R3

1k

NC

R4

1k

R5

20k

C1

100 F

+

TO SPEAKER

TO SPEAKER+

C5

100 F

+

R2

100k

48

47

46

45

44

43

42

41

40

39

38

37

13

14

15

16

17

18

19

20

21

22

23

24

14

13

12

11

10

9

8

C24

1 F

LINE IN RIGHT

C25

1 F

C27

1 F

C28

0.001 F

C30

1 F

R15

4.7k

R13

4.7k

C32

1 F

C33

1 F

R19

4.7k

R18

4.7k

NC

C31

1 F

R17

4.7k

R16

4.7k

AUX IN

MONO

PHONE

C29

1 F

R14

4.7k

R12

4.7k

C26

1 F

AUX

LEFT

PCBEEP

C22

1 F

C23

0.1 F

C9

1 F

C10

1 F

C13

0.047 F

C15

1 F

C16

270pF

C17

270pF

C12

0.1 F

C14

1 F

LINE OUT RIGHT

LINE OUT LEFT

C21

0.1 F

C16

10 F

C19

0.1 F

R9

2k

R10

10k

R11

1k

RST#

SYNC

SDATA

IN 0

BITCLK

SDATA

OUT

C20

27pF

R8

47

Y1

24.576MHz

SMT

AC CLK

C11

22pF

C8

22pF

NC

MONO OUT

C3

0.1 F

C2

10 F

AD1881

LINE IN LEFT

MIC IN

CD GND

CD RIGHT

CD LEFT

R6

20k

R7

20k

NC = NO CONNECT

NC NC NC NC

NC NC NC

NC

NC

Figure 18. PC 99 Compliant Audio System Reference Design

The AD1881 is an AC’97 Ver. 2.1 audio codec available from

Analog Devices. The stereo output from the AD1881 is coupled

into the SSM2250, which is used to drive a mono internal

speaker and stereo headphones. The internal speaker switching

is controlled by the SSM2250 through the normalizing pin on

the headphone jack. The AD1881 controls the shutdown pin on

the SSM2250, and is activated through the power management

software drivers installed on the computer.

For more information on the AD1881, the data sheet

can be downloaded from the Analog Devices web site at

http://www.analog.com.