參數資料
型號: TDA5100A
廠商: INFINEON TECHNOLOGIES AG
英文描述: ASK Transmitter 434 MHz
中文描述: ASK發(fā)射434兆赫
文件頁數: 22/29頁
文件大?。?/td> 936K
代理商: TDA5100A
Applications
4 - 5
TDA 5100 A
preliminary
Wireless Components
Specification, March 2001
4.4
Hints
1. Application Hints on the crystal oscillator
As mentioned before, the crystal oscillator achieves a turn on time less than
1 msec. To achieve this, a NIC oscillator type is implemented in the TDA 5100A.
The input impedance of this oscillator is a negative resistance in series to an
inductance. Therefore the load capacitance of the crystal CL (specified by the
crystal supplier) is transformed to the capacitance Cv.
CL:
crystal load capacitance for nominal frequency
ω
:
angular frequency
L:
inductance of the crystal oscillator
Example:
Assume a crystal frequency of 13.56 MHz and a crystal load capacitance of
CL = 20 pF. The inductance L is specified within the electrical characteristics at
13.56 MHz to a value of 4.5
μ
H. Therefore C6 is calculated to 12 pF.
IC
-R
L
f, CL
Cv
L
CL
Cv
2
1
1
ω
+
=
6
1
1
2
C
L
CL
Cv
=
+
=
ω
Formula 1)
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