LS204I

LS204 STMICROELECTRONICS | Alldatasheet

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DUAL OPERATIONAL AMPLIFIERS April 1998 .LOW POWER CONSUMPTION .SHORT CIRCUIT PROTECTION .LOW DISTORTION, LOW NOISE .HIGH GAIN-BANDWIDTH PRODUCT .HIGH CHANNEL SEPARATION Inverting Input 2 Non-inverting Input 2Non-inve rting Input 1 -CCV CCV + + - Output 1 Inve rting Input 1 Output PIN CONNECTIONS (top view) ORDER CODES Part Number Temperature Range Package ND LS204C 0, +70 oC •• LS204I -40, +105 oC •• 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 charac- teristics over the entire supply voltage range, and is particularlyintendedfor professionaland telecom applications (active filter, etc).

SCHEMATIC DIAGRAM (1/2 LS204) ABSOLUTE MAXIMUM RATINGS Symbol Parameter Value Unit VCC Supply Voltage ±18 V Vi Input Voltage ±VCC Vid Differential Input Voltage ± (VCC -1 ) Toper Operating Temperature Range LS204C LS204I 0 to +70 -40 to +105 oC Ptot Power Dissipation at Tamb =7 0oC 500 mW Tj Junction Temperature 150 oC Tstg Storage Temperature Range -65 to +150 oC LS204

ELECTRICAL CHARACTERISTICS (VCC = ±15V, Tamb = 25oC, unless otherwise specified) Symbol Parameter Test Conditions LS204I LS204C Unit ICC Supply Current 0.7 1.2 0.8 1.5 mA Iib Input Bias Current 50 150 100 300 nA Tmin.<T op <T max . 300 700 nA R i Input Resistance f = 1kHz 1 1 M Ω Vio Input Offset Voltage R s ≤ 10kΩ 0.5 2.5 0.5 3.5 mV R s ≤ 10kΩ Tmin.<T op <T max . 3.5 5 mV DV io Input Offset Voltage Drift Rs ≤ 10kΩ Tmin.<T op <T max .2 2 µV/oC Iio Input Offset Current 5 20 12 50 nA Tmin.<T op <T max . 40 100 nA DIio Input Offset Current Drift Tmin.<T op <T max . 0.08 0.1 nA Ios Output Short Circuit Current 23 23 mA Avd Large Signal Voltage Gain T min.<T op <T max . R L =2 kΩ VCC = ±15V VCC = ±4V 90 100 86 100 dB GBP Gain-Bandwidth Product f = 100kHz 1.8 3 1.5 2.5 MHz en Equivalent Input Noise Voltage f = 1kHz R s =5 0Ω R s =1 kΩ R s = 10kΩ 15 10 nV √Hz THD Total Harmonic Distortion A V = 20dB RL =2 kΩ VO =2 VPP f = 1kHz ±Vopp Output Voltage Swing R L =2 kΩ VCC = ±15V VCC = ±4V ±13 ±13 V Vopp Large Signal Voltage Swing RL = 10kΩ f = 10kHz 28 28 V PP SR Slew Rate Unity Gain, R L =2 kΩ 0.8 1.5 1 V/ µs CMR Common Mode Rejection Ratio V ic= 10V Tmin.<T op <T max .9 0 8 6 dB SVR Supply Voltage Rejection Ratio Vic= 1V f = 100Hz Tmin.<T op <T max .9 0 8 6 dB VO1 /VO2 Channel Separation f = 1kHz 100 120 120 dB LS204

APPLICATION INFORMATION : Active low-pass filter BUTTERWORTH The Butterworth is a ”maximally flat” amplitude response filter (figure 10) Butterworth filters are used for filteringsignals 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 waveformswith a minimum of distortion.They are also used to provide time delays for low pass filtering of modulated waveformsand 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 attenuationabove 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 1.1F csec. 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 0.4 0.8 0.6 0.1 0.8/f c 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 1.1/f c 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 1.6/f c 4.8/fc 8.2/fc 11.6/fc 2.7/fc 8.4/fc 16.3/fc 24.8/fc Design of 2ndorder active low pass filter (Sallen and Key configuration unity gain-op-amp) LS204

8 PINS - PLASTIC DIP

Dim. Millimeters Inches A 3.32 0.131 a1 0.51 0.020 B 1.15 1.65 0.045 0.065 b 0.356 0.55 0.014 0.022 b1 0.204 0.304 0.008 0.012 D 10.92 0.430 E 7.95 9.75 0.313 0.384 e 2.54 0.100 e3 7.62 0.300 e4 7.62 0.300 F 6.6 0260 i 5.08 0.200 L 3.18 3.81 0.125 0.150 Z 1.52 0.060 LS204

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 notice. 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.  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. PACKAGE MECHANICAL DATA

8 PINS - PLASTIC MICROPACKAGE (SO)

Dim. Millimeters Inches A 1.75 0.069 a1 0.1 0.25 0.004 0.010 a2 1.65 0.065 a3 0.65 0.85 0.026 0.033 b 0.35 0.48 0.014 0.019 b1 0.19 0.25 0.007 0.010 C 0.25 0.5 0.010 0.020 c1 45 o (typ.) D 4.8 5.0 0.189 0.197 E 5.8 6.2 0.228 0.244 e 1.27 0.050 e3 3.81 0.150 F 3.8 4.0 0.150 0.157 L 0.4 1.27 0.016 0.050 M 0.6 0.024 o (max.) LS204