TDA7110XT Infineon Technologies, TDA7110XT Datasheet - Page 26

• Manufacturer Part Number: TDA7110XT
• Manufacturer: Infineon Technologies

Specifications of TDA7110XT

• Operating Supply Voltage (max): 4V
• Operating Temp Range: -40C to 85C
• Operating Temperature Classification: Industrial
• Mounting: Surface Mount
• Pin Count: 16
• Lead Free Status / RoHS Status: Compliant

Wireless Components
Example for the FSK-Mode:
FSK modulation is achieved by switching the load capacitance of the crystal as
shown below.
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.
Because of the inductive part of the TDA7110, these values must be corrected
by Formula 1). The value of Cv± can be calculated.
C
C
f:
ω:
N:
df:
L
0
:
:
crystal load capacitance for nominal frequency
shunt capacitance of the crystal
frequency
ω = 2
division ratio of the PLL
peak frequency deviation
CL
-R
±
π
f: angular frequency
=
3 - 6
FSKDTA
Csw
CL
L
IC
1
Cv
m
±
C
±
N
0
Δ
=
*
N
FSKOUT
COSC
f
CL
f
Δ
*
1
1
f
1 (
f
±
1
+
1
1 (
+
f, CL Cv1
( 2
ω
+
C
2
( 2
L
0
C
C
+
1
0
C
CL
Data Sheet, December 2008
+
1
CL
)
)
)
)
Cv2
Applications
TDA7110