ALC658

Datasheet

Six-Channel AC’97 2.3 Audio Codec

Rev. 1.3

44

9.8. POWER OFF CD Function

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

power is supplied, the ALC658 will turn on the CD-IN op-amp and output amplifier. It is possible to design a system that can

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

The figure below indicates the system application circuitry that supports the ‘POWER OFF CD’ function. The operation mode

is determined by +3.3VCC and +5VA. Analog power without VAUX is required for ALC20x series CODECs.

Table 67. Power OFF CD Function Circuitry

+3.3VCC

+5VA

+5Vstandby

Operation Mode

No (0)

No (0)

No (0)

Shut Down

No (0)

Yes (1)

-

Power Off CD

No (0)

-

Yes (1)

Power Off CD

Yes (1)

No (0)

No (0)

Digital on, Analog is off

Yes (1)

Yes (1)

-

Normal

+3.3VCC

+5VA

+5Vstandby

D1

1N5817M/CYL

1

2

3

4

+

10u

+

10u

0.1u

0.1u

1u

1u

1u

0

0

0

ALC658

2

3

5

6

8

10

11

12

13

14

15

16

17

18

20

21

22

23

24

27

28

29

30

31

32

33

34

35

36

37

39

40

41

43

44

45

46

47

48

XTL-IN

XTL-OUT

SDOUT

BITCLK

SDIN

SYNC

RESET#

PC-BEEP

PHONE

AUX-L

AUX-R

JD2

JD1/GPIO1

CD-L

CD-R

MIC1

MIC2

LINE-L

LINE-R

VREF

VREFOUT

AFILT1

AFILT2

NC

NC

VREFOUT2

FRONT-MIC

FRONT-OUT-L

MONO-OUT/VREFOUT3

SURR-OUT-L

NC

SURR-OUT-R

CEN-OUT

LFE-OUT

JD0/GPIO0

XTLSEL

SPDIFI/EAPD

SPDIFO

D2

1N5817M/CYL

CD-IN

FRONT-OUT-R

Figure 9. Power OFF CD Function Circuitry