Electronic Components Datasheet Search
Selected language     English  ▼
Part Name
         Description


LS204 Datasheet(PDF) 6 Page - STMicroelectronics

Part No. LS204
Description  HIGH PERFORMANCE DUAL OPERATIONAL AMPLIFIERS
Download  10 Pages
Scroll/Zoom Zoom In 100% Zoom Out
Maker  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
Logo 

 
 6 page
background image
APPLICATION INFORMATION :
Active low-pass filter
BUTTERWORTH
The Butterworth is a ”maximally flat” amplitude
response filter (figure 10) Butterworth filters are
used for filtering signals in data acquisition systems
to prevent aliasing errors in samples-data applica-
tions and for general purpose low-pass filtering.
The cut-off frequency Fc, is the frequency at which
the amplitude response is down 3dB. The attenu-
ation rate beyond the cutoff frequency is n6 dB per
octave of frequency where n is the order (number
of poles) of the filter.
Other characteristics :
.
Flattest possible amplitude response
.
Excellent gain accuracy at low frequency end
of passband
BESSEL
The Bessel is a type of ”linear phase” filter. Be-
cause of their linear phase characteristics, these
filters approximate a constant time delay over a
limited frequency range. Bessel filters pass tran-
sient waveforms with a minimum of distortion. They
are also used to provide time delays for low pass
filtering of modulated waveforms and as a ”running
average” type filter.
The maximum phase shift is
−n
Π
2
radians where n
is the order (number of poles) of the filter. The
cut-off frequency fc, is defined as the frequency at
which the phase shift is one half of this value. For
accurate delay, the cut-off frequency should be
twice the maximum signal frequency.
The following table can be used to obtain the -3dB
frequency of the filter.
2 Pole
4 Pole
6 Pole
8 Pole
-3dB Frequency
0.77fc
0.67fc
0.57fc
0.50fc
Other characteristics :
.
Selectivity not as great as Chebyschev or But-
terworth
.
Very little overshoot response to step inputs
.
Fast rise time
CHEBYSCHEV
Chebyschev filters have greater selectivity than
either Bessel ro Butterworth at the expense of
ripple in the passband (figure 11).
Chebyschev filters are normally designed with
peak-to-peak ripple values from 0.2dB to 2dB.
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 specificed maximum ripple band and enters the
stop band.
Other characteristics :
.
Greater selectivity
.
Very non-linear phase response
.
High overshoot response to step inputs
The table below shows the typical overshoot and settling time response of the low pass filters to a 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
16
1.1Fcsec.
1.7/fc
2.4/fc
3.1/fc
1.7Fcsec.
2.8/fc
3.9/fc
5.1/fc
1.9Fcsec.
3.8/fc
5.0/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
-
-
-
-
Design of 2nd order active low pass filter (Sallen and Key configuration unity gain-op-amp)
LS204
6/10




Html Pages

1  2  3  4  5  6  7  8  9  10 


Datasheet Download



Related Electronics Part Number

Part NumberComponents DescriptionHtml ViewManufacturer
OP-04DUAL MATCHED HIGH PERFORMANCE OPERATIONAL AMPLIFIERS 1 2 3 4 5 MoreAnalog Devices
LH2101ADUAL HIGH PERFORMANCE OPERATIONAL AMPLIFIERS 1 2 3 National Semiconductor (TI)
LR4558The LR4558 consists of two high performance operational amplifiers 1 2 3 4 5 MoreList of Unclassifed Manufacturers
MC1748HIGH PERFORMANCE OPERATIONAL AMPLIFIERS 1 2 3 4 Motorola, Inc
UPC4558HIGH PERFORMANCE DUAL OPERATIONAL AMPLIFIER   1 2 3 4 5 MoreNEC
LS404HIGH PERFORMANCE QUAD OPERATIONAL AMPLIFIERS 1 2 3 4 5 MoreSTMicroelectronics
UPC4559HIGH PERFORMANCE DUAL OPERATIONAL AMPLIFIER    1 2 3 4 5 MoreNEC
LM4562Dual High Performance High Fidelity Audio Operational Amplifier 1 2 3 4 5 MoreNational Semiconductor (TI)
TS512HIGH SPEED PRECISION DUAL OPERATIONAL AMPLIFIERS 1 2 3 4 5 MoreSTMicroelectronics
UPC4560HIGH PERFORMANCE DUAL OPERATIONAL AMPLIFIER   1 2 3 4 5 MoreNEC

Link URL

Does ALLDATASHEET help your business so far?  [ DONATE ]  

About Alldatasheet   |   Advertisement   |   Datasheet Upload   |   Contact us   |   Privacy Policy   |   Bookmark   |   Link Exchange   |   Manufacturer List
All Rights Reserved© Alldatasheet.com 2003 - 2017    


Mirror Sites
English : Alldatasheet.com  , Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp  |   Russian : Alldatasheetru.com
Korean : Alldatasheet.co.kr   |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com  |   Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl