TDA5220 Datasheet, PDF (30/44 Pages) Infineon Technologies AG – ASK/FSK Single Conversion Receiver

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TDA 5220
preliminary
Applications
f₂ = v ⋅ f₁ =11⋅ f₁
f₃ = f_3dB
f₃ is the 3dB cutoff frequency of the data filter - see Section 4.2.
Example:
R = 100kΩ,=C = 47nF
This leads tof₁ = 44Hz and f₂ = 485Hz
4.6.2 ASK Mode
In case the receiver is operated in ASK mode the datapath frequency charac-
tersitic is dominated by the data filter alone, thus it is lowpass shaped.The cutoff
frequency is determined by the external capacitors C12 and C14 and the inter-
nal 100k resistors as described in Section 4.2
0dB
-3dB
-40dB/dec
f3dB
Figure 4-9 Frequency charcteristic in case of ASK mode
f
freq_ask.WMF
Wireless Components
4 - 10
Target Specification, October 2001