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LS204 데이터시트(PDF) 8 Page - STMicroelectronics

부품명 LS204
상세설명  High performance dual operational amplifier
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제조업체  STMICROELECTRONICS [STMicroelectronics]
홈페이지  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

LS204 데이터시트(HTML) 8 Page - STMicroelectronics

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Application information for active low-pass filters
LS204
8/16
Increased ripple in the passband allows increased attenuation above the cut-off frequency.
The cut-off frequency is defined as the frequency at which the amplitude response passes
through the specified maximum ripple band and enters the stop band.
Other characteristics:
Greater selectivity
Very non-linear phase response
High overshoot response to step inputs
Table 5 shows the typical overshoot and setting time response of the low pass filters to a
step input.
4.4
Design of 2nd order active low pass filter (Sallen and Key
configuration unity gain op-amp)
For fixed R = R1 = R2, we have (see Figure 13):
Table 5.
Overshoot and setting time response of low pass filters to step input
Number of
poles
Peak overshoot
Settling time (% of final value)
% Overshoot
±1%
±0.1%
±0.01%
Butterworth
2
4
6
8
4
11
14
14
1.1Fc sec.
1.7/
Fc
2.4/
Fc
3.1/
Fc
1.7Fc sec.
2.8/
Fc
3.9S/
Fc
5.1/
Fc
1.9Fc sec.
3.8/
Fc
5.0S/
Fc
7.1/
Fc
Bessel
2
4
6
8
0.4
0.8
0.6
0.1
0.8/
Fc
1.0/
Fc
1.3/
Fc
1.6/
Fc
1.4/
Fc
1.8/
Fc
2.1/
Fc
2.3/
Fc
1.7/
Fc
2.4/
Fc
2.7/
Fc
3.2/
Fc
Chebyschev (ripple ±0.25dB)
2
4
6
8
11
18
21
23
1.1/
Fc
3.0/
Fc
5.9/
Fc
8.4/
Fc
1.6/
Fc
5.4/
Fc
10.4/
Fc
16.4/
Fc
-
-
-
-
Chebyschev (ripple ±1dB)
2
4
6
8
21
28
32
34
1.6/
Fc
4.8/
Fc
8.2/
Fc
11.6/
Fc
2.7/
Fc
8.4/
Fc
16.3/
Fc
24.8/
Fc
-
-
-
C1 =
1
R
---- ζ
ωc
------
C2 =
1
R
----
1
ξ ωc
-----------


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