TDA7100XT Infineon Technologies, TDA7100XT Datasheet - Page 27

• Manufacturer Part Number: TDA7100XT
• Manufacturer: Infineon Technologies

Specifications of TDA7100XT

• Operating Temperature (min): -20C
• Operating Temperature (max): 70C
• Operating Temperature Classification: Commercial
• Operating Supply Voltage (min): 2.1V
• Operating Supply Voltage (typ): 2.5/3.3V
• Lead Free Status / Rohs Status: Compliant

Example for the ASK-Mode:
Referring to the application circuit, in ASK-Mode the capacitance C2 is replaced by a
short to ground. Assume a crystal frequency of 13.56MHz and a crystal load capacitance
of CL = 12 pF. The inductance L at 13.56MHz is about 4.6 µH. Therefore C1 is calculated
to 10 pF.
Example for the FSK-Mode:
FSK modulation is achieved by switching the load capacitance of the crystal as shown
below.
Figure 15
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.
Data Sheet
FSK Mode
-R
CL
±
=
FSKDTA
Csw
Cv
CL
L
IC
1
m
=
±
C
N
CL
0
1
∆
*
N
f
f
∆
FSKOUT
COSC
*
+
27
1
1
f
1 (
f
ω
1
+
2
1 (
L
( 2
+
f, CL Cv1
C
=
( 2
0
C
C
C
+
1
0
1
C
CL
+
1
CL
)
)
)
)
Cv2
V 1.0, 2007-05-02
Applications
TDA7100