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SP000012902 View Datasheet(PDF) - Infineon Technologies

Part NameDescriptionManufacturer
SP000012902 ASK Single Conversion Receiver Infineon
Infineon Technologies Infineon
SP000012902 Datasheet PDF : 38 Pages
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TDA 5201
ASK Single Conversion Receiver
Applications
4.2
Data Filter Design
Utilizing the on-board voltage follower and the two 100 kon-chip resistors a 2nd order Sallen-Key low pass data
filter can be constructed by adding 2 external capacitors between pin 19 (SLP) and pin 22 (FFB) and to pin 21
(OPP) as depicted in the following figure and described in the following formulas1).
C1
C2
Pins:
22
21
19
R
R
100k
100k
Figure 7 Data Filter Design
C1 = 2Q b
R2Πf 3dB
C2 =
b
4QRΠf3dB
with
Q= b
a
the quality factor of the poles where
in case of a Bessel filter
and thus
and in case of a Butterworth filter
and thus
a = 1.3617, b = 0.618
Q = 0.577
a = 1.141, b = 1
Q = 0.71
Example
Butterworth filter with
f3dB = 5 kHz and R = 100 k
C1 = 450 pF, C2 = 225 pF
1) Taken from Tietze/Schenk: Halbleiterschaltungstechnik, Springer Berlin, 1999
Data Sheet
23
(1)
(2)
(3)
Revision 1.6, 2010-12-21
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