參數(shù)資料
型號: TDA5200
廠商: INFINEON TECHNOLOGIES AG
元件分類: 參考電壓二極管
英文描述: surface mount silicon Zener diodes
中文描述: 表面貼裝硅穩(wěn)壓二極管
文件頁數(shù): 25/43頁
文件大?。?/td> 911K
代理商: TDA5200
C
Applications
4 - 5
TDA 5200
Wireless Components
Specification, March 2000
4.3 Quartz Load Capacitance Calculation
The value of the capacitor necessary to achieve that the quartz oscillator is
operating at the intended frequency is determined by the reactive part of the
negative resistance of the oscillator circuit as shown in Section 5.1.3 and by the
quartz specifications given by the quartz manufacturer.
Quartz_load.wmf
Figure 4-4
Determination of Series Capacitance Value for the Quartz Oscillator
Crystal specified with load capacitance
with C
l
the load capacitance (refer to the quartz crystal specification).
Examples:
6.7 MHz:
C
L
= 12 pF
X
L
=750
X
L
=1250
C
S
= 8.7 pF
C
S
= 5.3 pF
13.401 MHz: C
L
= 12 pF
These values may be obtained in high accuracy by putting two capacitors in
series to the quartz, such as 20pF and 15pF in the 6.7MHz case and 15pF and
8.2pF in the 13.401MHz case.
C
S
Crystal
Input
impedance
Z
1-28
TDA5200
Pin 28
Pin 1
L
l
S
X
f
C
π
2
1
1
+
=
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