TDA5200_10 INFINEON [Infineon Technologies AG], TDA5200_10 Datasheet - Page 25

• Manufacturer Part Number: TDA5200_10
• Description: ASK Single Conversion Receiver
• Manufacturer: INFINEON [Infineon Technologies AG]

4.3
The value of the capacitor necessary to achieve that the quartz oscillator is operating at the intended frequency is
determined by the reactive part of the negative resistance of the oscillator circuit as shown in
by the quartz specifications given by the quartz manufacturer.
Figure 8
Crystal specified with load capacitance
with
Examples
6.7 MHz
13.401 MHz
These values may be obtained in high accuracy by putting two capacitors in series to the quartz, such as 20 pF
and 15 pF in the 6.7 MHz case and 15 pF and 8.2 pF in the 13.401 MHz case.
But please note that the calculated value of
C
Data Sheet
S
=
C
L
C
the load capacitance (refer to the quartz crystal specification).
1
L
+
2
Quartz Load Capacitance Calculation
Determination of Series Capacitance Value for the Quartz Oscillator
1
π
f
X
L
C
C
L
L
= 12 pF
= 12 pF
Crystal
C
C
S
impedance
Z
S
includes the parasitic capacitors also.
1-28
Input
25
X
X
L
L
= 750 Ω
= 1250 Ω
TDA5200
Pin 1
Pin 28
ASK Single Conversion Receiver
C
C
S
S
Revision 3.0, 2010-12-28
= 8.7 pF
= 5.3 pF
Chapter 5.1.3
Applications
TDA 5200
and
(4)