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TDA5255E1 Datasheet(PDF) 49 Page - Infineon Technologies AG

No. de pieza TDA5255E1
Descripción Electrónicos  ASK/FSK 434MHz Wireless Transceiver
Download  91 Pages
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Fabricante Electrónico  INFINEON [Infineon Technologies AG]
Página de inicio  http://www.infineon.com
Logo INFINEON - Infineon Technologies AG

TDA5255E1 Datasheet(HTML) 49 Page - Infineon Technologies AG

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TDA5255 E1
Version 1.2
Application
Data Sheet
49
2007-02-26
Choosing CL as large as possible results in a small pulling sensitivity. On the other hand a small CL
keeps the influence of the serial inductance and the tolerances associated to it small (see formula
[3-17]).
Start-up Time
where:
-R:
is the negative impedance of the oscillator
see Figure 3-15
Rext:
is the sum of all external resistances (e.g. R1 or any
other resistance that may be present in the circuit,
see Figure 3-14
The proportionality of L1 and C1 of the crystal is defined by formula [3-13]. For a crystal with a small
C1 the start -up time will also be slower. Typically the lower the value of the crystal frequency, the
lower the C1.
A short conclusion regarding crystal and crystal oscillator dependencies is shown in the following
table:
The crystal oscillator in the TDA5255 is a NIC (negative impedance converter) oscillator type. The
input impedance of this oscillator is a negative impedance in series to an inductance. Therefore the
load capacitance of the crystal CL (specified by the crystal supplier) is transformed to the
capacitance Cv as shown in formula [3-17].
Table 3-1
Crystal and crystal oscilator dependency
Result
Independent variable
Relative Tolerance Maximum Deviation
tStart-up
C1 >
>>
>>
<
C0 >
<<
-
frequency of quartz >
>>>
>
<<
LOSC >
>>
>
-
CL >
><
-
()2
0
1
2
´
L
L
S
S
L
C
C
C
C
f
f
C
D
+
=
=
δ
δ
δ
δ
[3 – 15]
ext
Start
R
R
L
t
1
~
[3 – 16]


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