alc658 Realtek Semiconductor Corporation, alc658 Datasheet - Page 48

• Manufacturer Part Number: alc658
• Description: Six-channel Ac?97 2.3 Audio Codec
• Manufacturer: Realtek Semiconductor Corporation

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.
Six-Channel AC’97 2.3 Audio Codec
CD-IN
1
2
3
4
+3.3VCC
Yes (1)
Yes (1)
No (0)
No (0)
No (0)
0
0
0
Table 67. Power OFF CD Function Circuitry
Figure 9. Power OFF CD Function Circuitry
1u
1u
1u
Yes (1)
Yes (1)
No (0)
No (0)
+5VA
-
11
10
12
13
14
15
16
17
18
20
21
22
23
24
2
3
6
5
8
XTL-IN
XTL-OUT
RESET#
BITCLK
SYNC
SDOUT
SDIN
PC-BEEP
PHONE
AUX-L
AUX-R
JD2
JD1/GPIO1
CD-L
CD-R
MIC1
MIC2
LINE-L
LINE-R
0.1u
+5Vstandby
+
10u
Yes (1)
No (0)
No (0)
44
-
-
ALC658
+3.3VCC
MONO-OUT/VREFOUT3
1N5817M/CYL
Digital on, Analog is off
FRONT-OUT-L
FRONT-OUT-R
SPDIFI/EAPD
SURR-OUT-R
SURR-OUT-L
+
FRONT-MIC
VREFOUT2
JD0/GPIO0
D1
10u
VREFOUT
Operation Mode
CEN-OUT
LFE-OUT
SPDIFO
Power Off CD
Power Off CD
XTLSEL
AFILT1
AFILT2
+5VA
VREF
Shut Down
NC
NC
NC
Normal
0.1u
35
36
37
27
28
29
30
31
32
33
34
43
44
45
46
47
48
39
40
41
1N5817M/CYL
D2
+5Vstandby
Datasheet
ALC658
Rev. 1.3