LS404CN ,HIGH PERFORMANCE QUAD BIPOLAR OPERATIONAL AMPLIFIERSLS404 HIGH PERFORMANCEQUAD OPERATIONAL AMPLIFIER ■ SINGLE OR SPLIT SUPPLY OPERATION■ LOW PO ..
LS404I ,HIGH PERFORMANCE QUAD OPERATIONAL AMPLIFIERSLS404HIGH PERFORMANCEQUAD OPERATIONAL AMPLIFIERS.SINGLE OR SPLIT SUPPLY OPERATION.LOW POWER CONSUMP ..
LS404ID ,HIGH PERFORMANCE QUAD BIPOLAR OPERATIONAL AMPLIFIERSLS404 HIGH PERFORMANCEQUAD OPERATIONAL AMPLIFIER ■ SINGLE OR SPLIT SUPPLY OPERATION■ LOW PO ..
LS404IDT ,HIGH PERFORMANCE QUAD BIPOLAR OPERATIONAL AMPLIFIERSABSOLUTE MAXIMUM RATINGS Symbol Parameter Value UnitVSupply voltage ±18 VCC+VInput Voltage P ..
LS404IN ,HIGH PERFORMANCE QUAD BIPOLAR OPERATIONAL AMPLIFIERSABSOLUTE MAXIMUM RATINGS Symbol Parameter Value UnitVSupply voltage ±18 VCC+VInput Voltage P ..
LS40J2-1SR-T , Illuminated Type
LT1637HS8 ,1.1MHz, 0.4V/us Over-The-Top Micropower, Rail-To-Rail Input and Output Op Amp
LT1637IDD ,1.1MHz, 0.4V/us Over-The-Top Micropower, Rail-To-Rail Input and Output Op Amp
LT1637IMS8 ,1.1MHz, 0.4V/us Over-The-Top Micropower, Rail-To-Rail Input and Output Op Amp
LT1637IMS8 ,1.1MHz, 0.4V/us Over-The-Top Micropower, Rail-To-Rail Input and Output Op Amp
LT1637IMS8#PBF ,1.1MHz, 0.4V/us Over-The-Top Micropower, Rail-To-Rail Input and Output Op Amp
LT1638CDD ,1.2MHz, 0.4V/渭s Over-The-Top Micropower Rail-to-Rail Input and Output Op Amps
LS404CD-LS404CN-LS404ID-LS404IDT-LS404IN
HIGH PERFORMANCE QUAD BIPOLAR OPERATIONAL AMPLIFIERS
SINGLE OR SPLIT SUPPLY OPERATION LOW POWER CONSUMPTION SHORT CIRCUIT PROTECTION LOW DISTORTION, LOW NOISE HIGH GAIN-BANDWIDTH PRODUCT HIGH CHANNEL SEPARATION
DESCRIPTIONThe LS404 is a high performance quad operation-
al amplifier with frequency and phase compensa-
tion built into the chip. The internal phase compen-
sation allows stable operation as voltage follower
in spite of its high Gain-Bandwidth Product.
The circuit presents very stable electrical charac-
teristics over the entire supply voltage range, and
is particularly intended for professional and tele-
com applications (active filter, etc).
The patented input stage circuit allows small input
signal swings below the negative supply voltage
and prevents phase inversion when the inputs are
over drivers.
ORDER CODE
N = Dual in Line Package (DIP)
D = Small Outline Package (SO) - also available in Tape & Reel (DT)
PIN CONNECTIONS (top view)
HIGH PERFORMANCEQUAD OPERATIONAL AMPLIFIER
LS404
LS404
SCHEMATIC DIAGRAM (1/4 LS404)
ABSOLUTE MAXIMUM RATINGS
LS404
ELECTRICAL CHARACTERISTICS VCC = ±15V, Tamb = 25°C (unless otherwise specified)
LS404
LS404
LS404
APPLICATION INFORMATION: Active low-pass filter
BUTTERWORTHThe Butterworth is a "maximally flat" amplitude re-
sponse filter (figure 10) Butterworth filters are
used for filtering signals in data acquisition sys-
tems to prevent aliasing errors in samples-data
applications and for general purpose low-pass fil-
tering.
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
BESSELThe 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 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.
Other characteristics : Selectivity not as great as Chebyschev or
Butterworth Very little overshoot response to step inputs Fast rise time
CHEBYSCHEVChebyschev filters have greater selectivity than ei-
ther 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 setting time response of the low pass filters to a step
input.
Design of 2nd order active low pass filter (Sallen and Key configuration unity gain op-amp)–-----------
