TDA5251F1 Datasheet, PDF (45/88 Pages) Infineon Technologies AG – ASK/FSK 315MHz Wireless Transceiver

Confidential
TDA5251 F1
Version 1.0
Application
Sparam_measured_315.pcx
Figure 3-9 Sparam_measured_100M
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:
Carrier fc
fc-13.125MHz
fc+13.125MHz
2^nd harmonic
3^rd harmonic
+9dBm
-74dBm
-74dBm
-38dBm
-40dBm
Preliminary Specification
45
2003-02-18