TDA5252XT Infineon Technologies, TDA5252XT Datasheet - Page 47

• Manufacturer Part Number: TDA5252XT
• Manufacturer: Infineon Technologies

Specifications of TDA5252XT

• 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

Therefore the Resonant Frequency f s of the crystal is defined as:
The Series Load Resonant Frequency f S ‘ of the crystal is defined as:
regarding Figure 3-11
f s ’ is the nominal frequency of the crystal with a specified load when tested by the crystal
manufacturer.
Pulling Sensitivity of the crystal is defined as the magnitude of the relative change in frequency
relating to the variation of the load capacitor.
Choosing C L as large as possible results in a small pulling sensitivity. On the other hand a small C L
keeps the influence of the serial inductance and the tolerances associated to it small (see formula
[3-17]).
Start-up Time
The proportionality of L 1 and C 1 of the crystal is defined by formula [3-13]. For a crystal with a small
C 1 the start -up time will also be slower. Typically the lower the value of the crystal frequency, the
lower the C 1 .
A short conclusion regarding crystal and crystal oscillator dependencies is shown in the following
table:
Data Sheet
t
δ
δ
Start
C
D
L
=
~
δ
where:
f
f
δ
−
f
S
S
S
C
`
´
R
=
=
L
f
S
L
2
2
−
π
π
1
=
R
2
L
ext
1
L
(
1
1
C
-R:
R
1
*
*
0
−
ext
C
C
+
1
C
:
1
C
1
*
L
)
2
1
+
is the negative impedance of the oscillator
see Figure 3-11
is the sum of all external resistances (e.g. R
other resistance that may be present in the circuit,
see Figure 3-10
C
0
C
+
1
C
L
47
[3 – 16]
[3 – 15]
[3 – 13]
1
or any
TDA5252 G2
Version 1.1
Application
2007-02-26