參數(shù)資料
型號(hào)： TDK5100
廠商： INFINEON TECHNOLOGIES AG
英文描述： ASK/FSK Transmitter 868/433 MHz
中文描述： 詢價(jià)/ FSK發(fā)射器433分之868兆赫
文件頁(yè)數(shù)： 27/40頁(yè)
文件大小： 629K
代理商： TDK5100
Applications
3 - 8
TDK 5100
Wireless Components
Specification, October 2002
Example for the FSK-Mode:
FSK modulation is achieved by switching the load capacitance of the crystal as
shown below.
The frequency deviation of the crystal oscillator is multiplied with the divider
factor N of the Phase Locked Loop to the output of the power amplifier. In case
of small frequency deviations (up to +/- 1000 ppm), the two desired load
capacitances can be calculated with the formula below.
C
L
:
C
0
:
f:
ω
:
N:
df:
crystal load capacitance for nominal frequency
shunt capacitance of the crystal
frequency
ω = 2
π
f: angular frequency
division ratio of the PLL
peak frequency deviation
Because of the inductive part of the TDK 5100, these values must be corrected
by Formula 1). The value of Cv± can be calculated.
IC
-R
L
f, CL Cv1
Cv2
COSC
FSKOUT
FSKDTA
Csw
)
1
)
0
C
(
1
1
*
1
)
1
)
0
C
(
1
1
*
0
CL
C
f
N
f
CL
C
f
N
f
C
CL
CL
+
+
±
+
+
=
±
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