TDA5250D2_07 INFINEON [Infineon Technologies AG], TDA5250D2_07 Datasheet - Page 77

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

Figure 3-39
3.10.5
Applying the test setup in Figure 3-36 even a wide offset in the received frequency spectrum results
only in a slight decrease of receiving sensitivity. At an offset of 100kHz one of the two 50kHz FSK
peaks is at the 3dB border of the IQ filter (150kHz), which is the reason for the decline of the
sensitivity (see point A in Figure 3-40).
A frequency offset of 50kHz (FSK deviation: 50kHz) increases the data jitter of the demodulated
signal and therefore results in little loss of sensitivity (see point B in Figure 3-40).
In this case one of the peaks of the FSK-spectrum lies in the DC-blocking notch of the baseband
limiters.
Figure 3-40
Data Sheet
Sensitivity at Frequency Offset
Datarates and Sensitivity
BER Frequency Offset
77
BER_FrequOffset_FSK_3V..wmf
TDA5250 D2
Version 1.7
Application
BER_Datarate.wmf
2007-02-26