TDA5255XT Infineon Technologies, TDA5255XT Datasheet - Page 50
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TDA5255XT
Manufacturer Part Number
TDA5255XT
Description
Manufacturer
Infineon Technologies
Datasheet
1.TDA5255XT.pdf
(91 pages)
Specifications of TDA5255XT
Operating Temperature (min)
-40C
Operating Temperature (max)
85C
Operating Temperature Classification
Industrial
Product Depth (mm)
4.4mm
Product Length (mm)
9.7mm
Operating Supply Voltage (min)
2.1V
Operating Supply Voltage (max)
5.5V
Lead Free Status / Rohs Status
Compliant
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Figure 3-15
With the aid of this formula it becomes obvious that the higher the serial capacitance C V is, the
higher is the influence of L OSC .
The tolerance of the internal oscillator inductivity is much higher, so the inductivity is the dominating
value for the tolerance.
FSK modulation and tuning are achieved by a variation of C
In case of small frequency deviations (up to +/- 1000 ppm), the desired load capacitances for FSK
modulation are frequency depending and can be calculated with the formula below.
Data Sheet
C
L
=
C L ±
C
1
V
−
Crystal Oscillator
ω
1
=
2
L
C L
----------------------------------------------------------------------------------------- -
OSC
C
ω:
L
C
C
C
f:
N:
∆f:
OSC
1
L
L
0
1
+ −
:
:
:
:
±
↔
C 0
----------
N f ⋅
:
∆f
C
⋅
----------
N f ⋅
V
∆f
-R
⋅
=
crystal load capacitance for nominal frequency
angular frequency
inductivity of the crystal oscillator - typ: 2.7µH with pad of board
crystal load capacitance for nominal frequency
shunt capacitance of the crystal
motional capacitance of the crystal
crystal oscillator frequency
division ratio of the PLL
peak frequency deviation
1
C
⋅
1
+
L
1
2
---------------------------------
+
+
⋅
ω
1
(
2
---------------------------------
C 0
2
TDA 5250
⋅
C
L
(
1
L
OSC
C
+
OSC
C
0
C L
1
+
C
)
L
)
50
f, C
v
.
L
C
V
2.45µH without pad
[3 – 18]
[3 – 17]
TDA5255 E1
Version 1.2
Application
2007-02-26
QOSZ_NIC.wmf
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