參數(shù)資料
型號: CPS1087
英文描述: Analog IC
中文描述: 模擬IC
文件頁數(shù): 39/64頁
文件大?。?/td> 870K
代理商: CPS1087
Agere Systems Inc.
Data Sheet
January 2002
CSP1027 Voice Band Codec for
Cellular Handset and Modem Applications
39
7 Application Information
(continued)
Figure 31. Negative Resistance of Crystal Oscillator Circuit, V
DD
= 4.75 V
Figure 32. Negative Resistance of Crystal Oscillator Circuit, V
DD
= 3.0 V
5-7610 (F)
0
–20
–40
–60
–80
–100
–120
–140
–200
5
10
15
20
25
30
35
40
45
50
FREQUENCY (MHz)
R
)
–160
–180
C
EXT
=
50 pF
XLO
XHI
C
1
C
2
C
0
Z(
ω
)
C
1
= C
2
= C
EXT
CRYSTAL (7 pF MAXIMUM)
PROC
5.0 V
3.0 V
5.0 V
3.0 V
5.0 V
3.0 V
C
EXT
10 pF
10 pF
20 pF
20 pF
50 pF
50 pF
C
0
= PARASITIC CAPACITANCE OF
C
EXT
=
10 pF
C
EXT
=
20 pF
5-7611 (F)
0
–20
–40
–60
–80
–100
–120
–140
–200
6
10
14
18
22
26
30
34
38
FREQUENCY (MHz)
R
)
–160
–180
XLO
XHI
C
1
C
2
C
0
Z(
ω
)
C
1
= C
2
= C
EXT
CRYSTAL (7 pF MAXIMUM)
PROC
5.0 V
3.0 V
5.0 V
3.0 V
5.0 V
3.0 V
C
EXT
10 pF
10 pF
20 pF
20 pF
50 pF
50 pF
8
12
16
20
24
28
32
36
40
C
EXT
=
50 pF
C
0
= PARASITIC CAPACITANCE OF
C
EXT
=
10 pF
C
EXT
=
20 pF
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