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| 型號： | TDA5211 |
| 廠商： | INFINEON TECHNOLOGIES AG |
| 英文描述： | ZENER,SML4744,15V,5%,1W |
| 中文描述： | 詢價/ FSK信號單一轉(zhuǎn)換接收器 |
| 文件頁數(shù)： | 24/52頁 |
| 文件大小： | 1469K |
| 代理商： | TDA5211 |
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Applications
4 - 4
TDA 5211
Wireless Components
Specification, May 2001
4.2 Data Filter Design
Utilising the on-board voltage follower and the two 100k
on-chip resistors a
2nd order Sallen-Key low pass data filter can be constructed by adding 2 exter-
nal capacitors between pins 19 (SLP) and 22 (FFB) and to pin 21 (OPP) as
depicted in the following figure and described in the following formulas
1
.
Filter_Design.wmf
Figure 4-3
Data Filter Design
(1)(2)
with
(3)the quality factor of the poles
where
in case of a Bessel filter a = 1.3617, b = 0.618
and thus Q = 0.577
and in case of a Butterworth filtera = 1.414, b = 1
and thus Q = 0.71
Example: Butterworth filter with f
3dB
= 5kHz and R = 100k
:
C
1
= 450pF, C
2
= 225pF
1. taken from Tietze/Schenk: Halbleiterschaltungstechnik, Springer Berlin, 1999
Pins:
22
21
19
R
R
100k
100k
C
1
C
2
C
1
2Q b
R2
Π
f
3dB
----------------------
=
C2
b
4QR
Π
f
3dB
---------------------------
=
Q
b
a
------
=
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