ALC250 View Datasheet(PDF) - Unspecified

Part Name

Description

Manufacturer

ALC250

TWO CHANNEL AC’97 2.3 AUDIO CODEC with EQUALIZER

Unspecified 

ALC250 Data Sheet

9.9 POWER OFF CD Function

The ‘POWER OFF CD’ function describes a state which, after the system has been shut down and a +5V analog power is

supplied at VAUX(pin-34), the ALC250 will turn on the CD-IN op and output amplifier. It is possible to design a system which

will save op-amp circuitry and bypass CD output directly to the speaker.

The figure below indicates the system application circuitry to support the ‘POWER OFF CD’ function. The operation mode is

defined by +3.3VCC and +5Vaux.

+3.3VCC

No (0)

No (0)

Yes (1)

Yes (1)

+5Vaux

No (0)

Yes (1)

No (0)

Yes (1)

Operation Mode

Shut Down

Power Off CD

Normal (+5Vaudio must be on)

Normal (+5Vaudio must be on)

+

0.1u

10u

+5VA

+5Vstandby

D1

+3.3VDD

1N5817M/CYL

D2

+

10u

0.1u

1N5817M/CYL

U3

2

3

XTL-IN

XTL-OUT

LINEOUT-L

35

36

LINEOUT-R

MONO-OUT/VREFOUT3

37

11

6

10

5

RESET#

BITCLK

SYNC

8

SDOUT

SDIN

VREF

VREFOUT

27

28

29

AFILT1

AFILT2

30

31

12

13

14

PC-BEEP

PHONE

ALC250

NC 32

DCVOL

VREFOUT2

33

34

1

2

0

1u

0

15

16

17

18

20

21

AUX-L

AUX-R

JD2

JD1

CD-L

CD-R

VAUX

GPIO0

GPIO1

NC

XTLSEL

SPDIFI/EAPD

43

44

45

46

47

48

3

4

1u

22

23

MIC1

MIC2

SPDIFO

HPOUT-L

39

40

24 LINE-L

NC 41

0

LINE-R

HPOUT-R

1u

POWER OFF CD Circuitry

Two Channel AC’97 2.3 Audio Codec

38

Tel: +49(0)234-9351135 · Fax: +49(0)234-9351137 E-MAIL: info@cornelius-consult.de

Rev1.01

http://www.cornelius-consult.de

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