alc203-lf Realtek Semiconductor Corporation, alc203-lf Datasheet - Page 44

• Manufacturer Part Number: alc203-lf
• Description: Two-channel Ac?97 2.3 Audio Codec
• Manufacturer: Realtek Semiconductor Corporation

9.10 POWER OFF CD Function
The ‘POWER OFF CD’ function describes a state where, after the system has been shut down and a +5V analog power is
supplied at VAUX(pin-34), the ALC203 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.
Two-Channel AC’97 2.3 Audio Codec
+3.3VCC
Yes (1)
Yes (1)
No (0)
No (0)
1
2
3
4
+5Vaux
Yes (1)
Yes (1)
No (0)
No (0)
0
0
0
1u
1u
1u
Normal (+5Vaudio must be on)
Normal (+5Vaudio must be on)
11
10
12
13
14
15
16
17
18
20
21
22
23
24
2
3
6
5
8
POWER OFF CD Circuitry
XTL-IN
XTL-OUT
RESET#
BITCLK
SYNC
SDOUT
SDIN
PC-BEEP
PHONE
AUX-L
AUX-R
JD2
JD1
CD-L
CD-R
MIC1
MIC2
LINE-L
LINE-R
Operation Mode
0.1u
Power Off CD
Shut Down
+
10u
40
ALC203
+3.3VDD
MONO-OUT/VREFOUT3
1N5817M/CYL
VREFOUT2/DCVOL
SPDIFI/EAPD
+
LINEOUT-R
LINEOUT-L
10u
VREFOUT
HPOUT-R
HPOUT-L
D1
SPDIFO
XTLSEL
AFILT1
AFILT2
GPIO0
GPIO1
VRAD
VRDA
+5VA
VREF
VAUX
ID0#
NC
0.1u
35
36
37
27
28
29
30
31
32
33
34
43
44
45
46
47
48
39
40
41
U3
1N5817M/CYL
ALC203 DataSheet
D2
+5Vstandby
Rev1.6