参数资料
型号: PEF3452
厂商: INFINEON TECHNOLOGIES AG
英文描述: Line Interface Unit for DS3, STS 1 and E3
中文描述: 线路接口单元的DS3中,STS 1和E3
文件页数: 55/71页
文件大小: 1372K
代理商: PEF3452
PEF 3452
TE3-LIU V1.3
Electrical Characteristics
Preliminary Data Sheet
45
2001-12-05
PRELIMINARY
Figure 22
Crystal Pulling Range
Note: C
Leff
= C
Lext
+ C
Lint
+ C
Lpara
C
Lext
=
0.5 x C
L
Table 21
X
TAL Crystal Parameter Values
No.
Parameter
Limit Values
min.
typ.
14.912
17.280
11.456
Unit
max.
1
Crystal nominal frequency DS3
Crystal nominal frequency STS-1
Crystal nominal frequency E3
Crystal motional capacitance C
1
Crystal shunt capacitance C
0
Crystal load capacitance C
Leff1)
Crystal resonance resistance R
r
Internal parasitic load capacitance C
Lint
MHz
MHz
MHz
fF
pF
pF
pF
2
3
4
5
6
25
7
15
1)
This value includes the capacitance of the external capacitors (C
Lext
) plus all internal (C
Lint
) and external
parasitic capacitances (C
Lpara
). The value of the external capacitor has to be chosen depending on the printed
circuit board layout. A typical value for C
L
is 0 to 10 pF, C
L
should be adapted to the parasitics to achieve a
symmetrical pulling range.
30
7.5
F0259
0
-50
-100
-150
-200
+
50
+
100
+
150
+
200
15
Load Capacitance C
Leff
[
pF
]
f - f
0
f
0
[
ppm
]
p
20
10
nominal value
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