tda5251f1 Infineon Technologies Corporation, tda5251f1 Datasheet - Page 45

• Manufacturer Part Number: tda5251f1
• Description: Ask/fsk 315mhz Wireless Transceiver
• Manufacturer: Infineon Technologies Corporation

Confidential
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:
Preliminary Specification
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 1.0
Application
2003-02-18