SigmaTel, Inc.
Data Sheet
STAC9721
Figure 3. Connection Diagram –
See Appendix A for an alternative connection diagram when using separate supplies.
See Appendix B for specific connection requirements prior to operation.
2 ohm *
Ferrite Bead *
* Suggested
3.3V or 5V ± 5%
0.1uF
10uF
0.1uF
0.1uF
0.1uF
1uF
25
38
AVdd2
1
9
27pF
2
3
AVdd1
DVdd1
DVdd2
XTL_IN
24.576MHz
27pF
12
PC_BEEP
XTL_OUT
13
14
PHONE
AUX_L
5
6
SDATA_OUT
BIT_CLK
SDATA_IN
SYNC
22 ohms
8
27pF
EMI
15
16
Filter
AUX_R
10
SigmaTel
STAC9721/23
VIDEO_L
11
45
RESET
CID0
17
18
VIDEO_R
CD_L
46
CID1
19
20
CD_GND
CD_R
27
28
Vref
0.1uF
1uF
21
22
23
MIC1
Vrefout
MIC2
Optional Anti-Pop Circuit
31
33
CAP1
CAP3
LINE_IN_L
10uF
24
32
LINE_IN_R
CAP2
100uF
34
APOP
47
35
EAPD
1uF
0.1uF
LINE_OUT_L
36
37
LINE_OUT_R
MONO_OUT
820pF
29
30
AFILT1
AFILT2
820pF
AVss1
26
AVss2
42
DVss1
4
DVss2 LNLVL_OUT_L
LNLVL_OUT_R
41
** Teminate ground
39
7
plane as close to power
supply as possible
NOTE: Pins 31, 33, 34, 40
43, 44, and 48 are No Connects
Analog Gnd
Digital Gnd
6
04/07/00
04/07/00
ETC [ ETC ]
