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LS204
HIGH PERFORMANCE DUAL OPERATIONAL AMPLIFIERS
. . . . .
LOW POWER CONSUMPTION SHORT CIRCUIT PROTECTION LOW DISTORTION, LOW NOISE HIGH GAIN-BANDWIDTH PRODUCT HIGH CHANNEL SEPARATION
N DIP8 (Plastic Package)
D SO8 (Plastic Micropackage)
DESCRIPTION The LS204 is a high performance dual operational amplifier with frequency and phase compensation built intothe chip. The internal phasecompensation allows stable operation as voltage follower in spite of its high Gain-Bandwidth Product. The circuit presents very stable electrical characteristics over the entire supply voltage range, and is particularlyintended for professional and telecom applications (active filter, etc). PIN CONNECTIONS (top view)
ORDER CODES
Part Number LS204C LS204I Temperature Range 0, +70oC -40, +105 C
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Package N * * D * *
Output 1 1 Inve rting Input 1 2 Non-inve rting Input 1 3 VCC - 4
8
VCC +
+
7
Output Non-inve rting Input 2 Inve rting Input 2
+
6 5
April 1998
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SCHEMATIC DIAGRAM (1/2 LS204)
ABSOLUTE MAXIMUM RATINGS
Symbol VCC Vi Vid Toper Ptot Tj Tstg Supply Voltage Input Voltage Differential Input Voltage Operating Temperature Range Power Dissipation at Tamb = 70oC Junction Temperature Storage Temperature Range LS204C LS204I Parameter Value 18 VCC (VCC - 1) 0 to +70 -40 to +105 500 150 -65 to +150
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Unit V
C
mW
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C C
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ELECTRICAL CHARACTERISTICS (VCC = 15V, Tamb = 25oC, unless otherwise specified)
Symbol ICC Iib Ri Vio Parameter Supply Current Input Bias Current Tmin. < Top < Tmax. Input Resistance Input Offset Voltage f = 1kHz Rs 10k Rs 10k Tmin. < Top < Tmax. DVio Iio DIio Ios Avd Input Offset Voltage Drift Input Offset Current Tmin. < Top < Tmax. Input Offset Current Drift Output Short Circuit Current Large Signal Voltage Gain Tmin. < Top < Tmax. RL = 2k VCC = 15V VCC = 4V f = 100kHz f = 1kHz Rs = 50 Rs = 1k Rs = 10k AV = 20dB R L = 2k VO = 2VPP f = 1kHz RL = 2k VCC = 15V VCC = 4V RL = 10k f = 10kHz Unity Gain, RL = 2k Vic = 10V Tmin. < Top < Tmax. Vic = 1V f = 100Hz Tmin. < Top < Tmax. f = 1kHz 0.8 90 90 100 120 13 90 1.8 Tmin. < Top < Tmax. 0.08 23 100 95 3 8 10 18 0.03 3 28 1.5 86 dB 86 120 dB 15 86 1.5 Rs 10k Tmin. < Top < Tmax. 2 5 20 40 0.1 23 100 95 2.5 10 12 20 0.03 13 3 28 1 0.1 MHz nV Hz % V VPP V/s dB 1 0.5 2.5 3.5 2 12 50 100 Test Conditions LS204I Min. Typ. 0.7 50 Max. 1.2 150 300 1 0.5 3.5 5 V/ C nA nA nA C mA dB
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LS204C Min. Typ. 0.8 100 Max. 1.5 300 700
Unit mA nA nA M mV mV
GBP en
Gain-Bandwidth Product Equivalent Input Noise Voltage
THD Vopp Vopp SR CMR SVR VO1 /VO2
Total Harmonic Distortion Output Voltage Swing Large Signal Voltage Swing Slew Rate Common Mode Rejection Ratio Supply Voltage Rejection Ratio Channel Separation
0.1
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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 applications and for general purpose low-pass filtering. The cut-off frequency Fc, is the frequency at which the amplitude response is down 3dB. The attenuation 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 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 0.67fc 6 Pole 0.57fc 8 Pole 0.50fc
. .
. . .
-3dB Frequency
0.77fc
Other characteristics : Selectivity not as great as Chebyschev or Butterworth 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
BESSEL The Bessel is a type of "linear phase" filter. Because of their linear phase characteristics, these filters approximate a constant time delay over a limited frequency range. Bessel filters pass transient 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. -n The maximum phase shift is radians where n 2 is the order (number of poles) of the filter. The
. . .
The table below shows the typical overshoot and settling time response of the low pass filters to a step input. Number of Poles Butterworth 2 4 6 8 2 4 6 8 2 4 6 8 2 4 6 8 Peak Overshoot % Overshoot 4 11 14 16 0.4 0.8 0.6 0.1 11 18 21 23 21 28 32 34 Settling Time (% of final value) 1% 1.1Fcsec. 1.7/fc 2.4/fc 3.1/fc 0.8/fc 1.0/fc 1.3/fc 1.6/fc 1.1/fc 3.0/fc 5.9/fc 8.4/fc 1.6/fc 4.8/fc 8.2/fc 11.6/fc 0.1% 1.7Fcsec. 2.8/fc 3.9/fc 5.1/fc 1.4/fc 1.8/fc 2.1/fc 2.3/fc 1.6/fc 5.4/fc 10.4/fc 16.4/fc 2.7/fc 8.4/fc 16.3/fc 24.8/fc 0.01% 1.9Fcsec. 3.8/fc 5.0/fc 7.1/fc 1.7/fc 2.4/fc 2.7/fc 3.2/fc -
Bessel
Chebyschev (ripple 0.25dB)
Chebyschev (ripple 1dB)
Design of 2nd order active low pass filter (Sallen and Key configuration unity gain-op-amp)
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PACKAGE MECHANICAL DATA 8 PINS - PLASTIC DIP
Dim. A a1 B b b1 D E e e3 e4 F i L Z
Millimeters Min. 0.51 1.15 0.356 0.204 7.95 2.54 7.62 7.62 6.6 5.08 3.18 3.81 1.52 0.125 1.65 0.55 0.304 10.92 9.75 0.313 Typ. 3.32 0.020 0.045 0.014 0.008 Max. Min.
Inches Typ. 0.131 0.065 0.022 0.012 0.430 0.384 0.100 0.300 0.300 0260 0.200 0.150 0.060 Max.
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PACKAGE MECHANICAL DATA 8 PINS - PLASTIC MICROPACKAGE (SO)
Dim. A a1 a2 a3 b b1 C c1 D E e e3 F L M S
Min. 0.1 0.65 0.35 0.19 0.25 4.8 5.8
Millimeters Typ.
Max. 1.75 0.25 1.65 0.85 0.48 0.25 0.5 45o (typ.) 5.0 6.2
Min. 0.004 0.026 0.014 0.007 0.010 0.189 0.228
Inches Typ.
Max. 0.069 0.010 0.065 0.033 0.019 0.010 0.020 0.197 0.244
1.27 3.81 3.8 0.4 4.0 1.27 0.6 8 (max.)
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0.050 0.150 0.150 0.016 0.157 0.050 0.024
Information furnished is believed to be accurate and reliable. However, SGS-THOMSON Microelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of SGS-THOMSON Microelectronics. Specifications mentioned in this publication are subject to change without noti ce. This publication supersedes and replaces all information previously supplied. SGS-THOMSON Microelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of SGS-THOMSON Microelectronics. (c) 1998 SGS-THOMSON Microelectronics - Printed in Italy - All Rights Reserved SGS-THOMSON Microelectronics GROUP OF COMPANIES Australia - Brazil - Canada - China - France - Germany - Italy - Japan - Korea - Malaysia - Malta - Morocco The Netherlands - Singapore - Spain - Sweden - Switzerland - Taiwan - Thailand - United Kingdom - U.S.A.
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