參數(shù)資料
型號： STAC9711
廠商： Electronic Theatre Controls, Inc.
元件分類： Codec
英文描述： Multi-Channel AC97 Codec With Multi-Codec Option
中文描述： 多聲道AC97編解碼器與多編解碼器方案
文件頁數(shù)： 51/56頁
文件大小： 247K
代理商： STAC9711
SigmaTel, Inc.
Preliminary
STAC9708/11
51
10/02/98
Appendix A
SPLIT INDEPENDENT POWER SUPPLY OPERATION
In PC applications, one power supply input to the STAC9708/11 may be derived from a supply regulator (as
shown in Figure 3) and the other directly from the PCI power supply bus. When power is applied to the PC, the
regulated supply input to the IC will be applied some time delay after the PCI power supply. Without proper on-
chip partitioning of the analog and digital circuitry, some manufacturer's codecs would be subject to on-chip SCR
type latch-up.
SigmaTel’s STAC9708/11 specifically allows power-up sequencing delays between the analog (AVddx) and
digital (VDddx) supply pins. These two power supplies can power-up independently and at different rates with
no adverse effects to the codec. The IC is designed with independent analog and digital circuitry that prevents
on-chip SCR type latch-up.
V I D E O _ L
V I D E O _ R
A U X _ L
AFILT1
AFILT2
AVss1
AVss2
DVss1
DVss2
A V d d 1
A V d d 2
D V d d 1
D V d d 2
0.1uF
10uF
1uF
0.1uF
0.1uF
0.1uF
560 - 1000pF
29
30
14
17
16
25
38
1
9
7
4
42
26
3
2
C A P 2
X T L _ O U T
X T L _ I N
3.3V or 5V ± 5%
24.576MHz
32
0.1uF
10uF
S igm a T e l
STAC9708/11
28
Vrefout
Vref
27
10uF
0.1uF
33pF
33pF
L I N E _ O U T _ L
L I N E _ O U T _ R
M O N O _ O U T
35
36
37
LINE_IN_R
24
LINE_IN_L
23
P H O N E
13
P C
_
B E E P
12
M I C 2
22
A U X _ R
15
M I C 1
21
6
5
8
11
10
S D A T A _ O U T
S D A T A _ I N
R E S E T
S Y N C
B I T _ C L K
C D _ G N D
C D _ R
20
19
18
C D _ L
Brd Analog Gnd
Brd Digital Gnd
NOTE: Pins 31, 33, 34, 40
43, 44, and 48 are No Connects
** Teminate ground
plane as close to power
supply as possible
D A C _ O U T _ L
D A C _ O U T _ R
39
41
46
45
CID1
CID0
560 - 1000pF
CID0
46
45
CID1
A P O P
E A P D
34
47
C A P 1
31
C A P 3
33
10uF
22uF
3.3V or 5V ± 5%
REG
* AVdd must always be >= DVdd
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