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LS204ID View Datasheet(PDF) - STMicroelectronics

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LS204ID Datasheet PDF : 16 Pages
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Application information for active low-pass filters
LS204
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.
Table 5. Overshoot and setting time response of low pass filters to step input
Number of Peak overshoot
poles
% Overshoot
Settling time (% of final value)
±1%
±0.1% ±0.01%
2
4
Butterworth
6
8
2
Bessel
4
6
8
2
Chebyschev (ripple ±0.25dB)
4
6
8
2
Chebyschev (ripple ±1dB)
4
6
8
4
1.1Fc sec. 1.7Fc sec. 1.9Fc sec.
11
1.7/Fc 2.8/Fc 3.8/Fc
14
2.4/Fc 3.9S/Fc 5.0S/Fc
14
3.1/Fc 5.1/Fc 7.1/Fc
0.4
0.8/Fc 1.4/Fc 1.7/Fc
0.8
1.0/Fc 1.8/Fc 2.4/Fc
0.6
1.3/Fc 2.1/Fc 2.7/Fc
0.1
1.6/Fc 2.3/Fc 3.2/Fc
11
1.1/Fc 1.6/Fc
-
18
3.0/Fc 5.4/Fc
-
21
5.9/Fc 10.4/Fc
-
23
8.4/Fc 16.4/Fc
-
21
1.6/Fc 2.7/Fc
28
4.8/Fc 8.4/Fc
-
32
8.2/Fc 16.3/Fc
-
34
11.6/Fc 24.8/Fc
-
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):
C1
=
-1--
R
ω--ζ--c-
C2
=
-1--
R
-ξ----1-ω---c-
8/16
 

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