TDA5251XT Infineon Technologies, TDA5251XT Datasheet - Page 45

• Manufacturer Part Number: TDA5251XT
• Manufacturer: Infineon Technologies

Specifications of TDA5251XT

• 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

Figure 3-9
Above you can see the measurement of the evalboard with a span of 100MHz. The evalboard has
been optimized for 3V. The load is about 250+j0 at 315MHz.
A tuning-free realization requires a careful design of the components within the matching network.
A simple linear CAE-tool will help to see the influence of tolerances of matching components.
Suppression of spurious harmonics may require some additional filtering within the antenna
matching circuit. Both can be seen in Figure 3-10 and Figure 3-11 The total spectrum of the
evalboard can be summarized as:
Data Sheet
Carrier fc
fc-13.125MHz
fc+13.125MHz
2
3
nd
rd
harmonic
harmonic
Sparam_measured_100M
+9dBm
-74dBm
-74dBm
-38dBm
-40dBm
45
Sparam_measured_315.pcx
TDA5251 F1
Version 1.1
Application
2007-02-26