參數(shù)資料
型號(hào)： TDA5221
廠商： INFINEON TECHNOLOGIES AG
英文描述： ASK/FSK Single Conversion Receiver
中文描述： 詢價(jià)/ FSK信號(hào)單一轉(zhuǎn)換接收器
文件頁(yè)數(shù)： 25/44頁(yè)
文件大?。?/td> 705K
代理商： TDA5221
Applications
4 - 5
TDA 5221
preliminary
Wireless Components
Target Specification, October 2001
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_5221.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).
Example:
10.18 MHz: C
L
= 12 pF
X
L
=870
C
S
= 7.2 pF
This value may be obtained by putting two capacitors in series to the quartz,
such as 18pF and 22pF in the 5.1MHz case and 18pF and 12pF in the 10.2MHz
case.
C
S
Crystal
Input
impedance
Z
1-28
TDA5221
Pin 28
Pin 1
L
l
S
X
f
C
C
π
2
1
1
+
=
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