TDA5250D2_07 INFINEON [Infineon Technologies AG], TDA5250D2_07 Datasheet - Page 47

• Manufacturer Part Number: TDA5250D2_07
• Description: ASK/FSK 868MHz Wireless Transceiver
• Manufacturer: INFINEON [Infineon Technologies AG]

Figure 3-9
Above you can see the measurement of the evalboard with a span of 200MHz. The evalboard has
been optimized for 3V. The load is about 240+j0 at 868.3MHz.
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-18.1MHz
fc+18.1MHz
2
3
nd
rd
harmonic
harmonic
Sparam_measured_200M
+9dBm
-66dBm
-40dBm
-44dBm
-62dBm
47
Sparam_measured_200M.pcx
TDA5250 D2
Version 1.7
Application
2007-02-26