HIGH PERFORMANCE QUAD OPERATIONAL AMPLIFIER SINGLE SPLIT SUPPLY O
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LS404
HIGH PERFORMANCE QUAD OPERATIONAL AMPLIFIER
SINGLE SPLIT SUPPLY OPERATION POWER CONSUMPTION SHORT CIRCUIT PROTECTION DISTORTION, NOISE HIGH GAIN-BANDWIDTH PRODUCT HIGH CHANNEL SEPARATION
DIP14 (Plastic Package)
DESCRIPTION LS404 high performance quad operational amplifier with frequency phase compensation built into chip. internal phase compensation allows stable operation voltage follower spite high Gain-Bandwidth Product. circuit presents very stable electrical characteristics over entire supply voltage range, particularly intended professional telecom applications (active filter, etc). patented input stage circuit allows small input signal swings below negative supply voltage prevents phase inversion when inputs over drivers. ORDER CODE
Package Part Number Temperature Range LS404C 0°C, +70°C LS404I -40°C, +105°C LS404M -55°C, +125°C Example LS204CN
Non-inverting Input Non-inverting Input Inverting Input Output
SO14 (Plastic Micropackage)
CONNECTIONS (top view)
Output Inverting Input
Output Inverting Input Non-inverting Input Non-inverting Input Inverting Input Output
Dual Line Package (DIP) Small Outline Package (SO) also available Tape Reel (DT)
November 2001
1/11
LS404
SCHEMATIC DIAGRAM (1/4 LS404)
Inverting input
Non-inverting input
Output
ABSOLUTE MAXIMUM RATINGS
Symbol Toper Ptot Tstg Power Dissipation Tamb 70°C Storage Temperature Range Supply voltage Input Voltage Differential Input Voltage Operating Temperature Range LS204C LS204I LS204I Positive Negative Parameter Value +VCC ±(VCC +105 +125 +150 Unit
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LS404
ELECTRICAL CHARACTERISTICS ±15V, 25°C (unless otherwise specified)
LS404I LS404M Symbol Parameter Min. Supply Current Input Bias Current Input Resistance 1kHz) Input Offset Voltage 10k) Input Offset Voltage Drift 10k) Tmin Tmax Input Offset Current Input Offset Current Drift Tmin Tmax Output Short-circuit Current Large Signal Voltage Gain ±15V Gain Bandwith Product =100kHz, 100pF Equivalent Input Noise Voltage 1kHz, Total Harmonic Distortion Unity Gain 1kHz 20kHz Output Voltage Swing ±15V Large Signal Voltage Swing 10kHz, Slew Rate unity gain) Supply Voltage Rejection Ratio 100Hz Common Mode Rejection Ratio Typ. 0.08 Max. Min. Typ. Max. µV/°C nA/°C LS404C Unit
0.01 0.03 0.01 0.03
±Vopp
Vopp
V/µs
Vo1/Vo2 Channel Separation 1kHz)
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LS404
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LS404
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LS404
APPLICATION INFORMATION: Active low-pass filter BUTTERWORTH Butterworth "maximally flat" amplitude response filter (figure Butterworth filters used filtering signals data acquisition systems prevent aliasing errors samples-data applications general purpose low-pass filtering. cut-off frequency frequency which amplitude response down 3dB. attenuation rate beyond cutoff frequency octave frequency where order (number poles) filter. Other characteristics Flattest possible amplitude response Excellent gain accuracy frequency passband BESSEL Bessel type "linear phase" filter. Because their linear phase characteristics, these filters approximate constant time delay over limited frequency range. Bessel filters pass transient waveforms with minimum distortion. They also used provide time delays pass filtering modulated waveforms "running average" type filter. maximum phase shift radians where order (number poles) filter. cut-off frequency defined frequency which phase shift half this value. input.
Number Poles Peak Overshoot Overshoot Butterworth Settling Time final value) 1.1Fc sec. 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% 1.7Fc sec. 2.8/fc 3.9S/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% 1.9Fc sec. 3.8/fc 5.0S/fc 7.1/fc 1.7/fc 2.4/fc 2.7/fc 3.2/fc
accurate delay, cut-off frequency should twice maximum signal frequency. following table used obtain -3dB frequency filter.
Pole -3dB Frequency 0.77fc Pole 0.67fc Pole 0.57fc Pole 0.50fc
Other characteristics Selectivity great Chebyschev Butterworth Very little overshoot response step inputs Fast rise time CHEBYSCHEV Chebyschev filters have greater selectivity than either Bessel Butterworth expense ripple passband (figure 11). Chebyschev filters normally designed with peak-to-peak ripple values from 0.2dB 2dB. Increased ripple passband allows increased attenuation above cut-off frequency. cut-off frequency defined frequency which amplitude response passes through specificed maximum ripple band enters stop band. Other characteristics Greater selectivity Very non-linear phase response High overshoot response step inputs
table below shows typical overshoot setting time response pass filters step
Bessel
Chebyschev (ripple ±0.25dB)
Chebyschev (ripple ±1dB)
Design order active pass filter (Sallen configuration unity gain op-amp)
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LS404
Fixed have (see figure Figure Filter Configuration
Vout
Three parameters needed characterize frequency phase response order active filter: gain (Gv), damping factio factor )1), cuttoff frequency (fc). Table
Filter Response Bessel
higher order response obtained with series order sections. simple section introduced when filter required. choice factor) determines filter response (see table
Cuttoff Frequency Frequency which Phase Shift -90°C
Butterworth
Frequency which -3dB
Chebyschev
Frequency which amplitude response passes through specified max. ripple band enters stop bank.
EXAMPLE Figure Order Low-pass Filter (Butterworth) with Unity Gain configuration
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LS404
circuit figure 3.4kHz 10k, obtain: 1.354 6.33nF 0.421 1.97nF 1.753 8.20nF 0.309 1.45nF 3.325 15.14nF attenuation filter 30dB 6.8kHz better than 60dB 15kHz. Table Damping Factor Low-pass Butterworth Filters
Order 1.336 1.354 1.392 0.707 0.202 0.92 0.421 0.966 0.488 0.98 1.41 3.54 1.08 1.75 1.035 1.53 1.02 0.38 0.309 0.707 0.623 0.83 2.61 3.235 1.414 1.604 1.20 0.259 0.222 0.556 3.86 4.49 1.80 0.195 5.125
same method, referring table figure used design high-pass filter. this case damping factor found taking reciprocal numbers table 5kHz obtain: 25.5k 0.354 75.6k 0.421 18.2k 1.753 103k 0.309 9.6k 3.325
Figure Order High-pass Filter (Butterworth) with Unity Gain configuration
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LS404
Figure Multiple Feedback 8-pole Bandpass Filter
0.1µ 0.1µF
LS404
LS404
LS404
LS404
0.1µF
220µ
0.22
Figure pole 355Hz Low-pass Filter (chebychev type)
0.47µF 16.3nF 86.1nF 220nF 161nF
3.54nF 60nF
This pole Chebychev type with ±0.25dB ripple passband. decoupling stage used avoid influence input impedance filter's characteristics. attenuation about 55dB 710Hz reaches 80dB 1065Hz. band attenuation limited practise ±0.25dB ripple does exceed 0.5dB 0.9fc. Figure Subsonic Filter 0dB)
(Hz)
(µF)
Vout
0.68 0.47 0.33 0.22 0.10
Figure High filter 0dB)
(Hz)
(nF)
(nF)
Vout
0.68
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LS404
PACKAGE MECHANICAL DATA PINS PLASTIC PACKAGE
Millimeters Dimensions Min. 0.51 1.39 0.25 2.54 15.24 1.27 2.54 0.050 Typ. Max. 1.65 Min. 0.020 0.055
Inches Typ. Max. 0.065 0.020 0.010 0.787 0.335 0.100 0.600 0.280 0.201 0.130 0.100
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LS404
PACKAGE MECHANICAL DATA PINS PLASTIC MICROPACKAGE (SO)
Millimeters Dimensions Min. 0.35 0.19 (typ.) 8.55 1.27 7.62 1.27 0.68 (max.) 0.150 0.181 0.020 8.75 0.336 0.228 Typ. Max. 1.75 0.46 0.25 Min. 0.004 0.014 0.007
Inches Typ. Max. 0.069 0.008 0.063 0.018 0.010 0.020 0.344 0.244 0.050 0.300 0.157 0.208 0.050 0.027
Note include mold flash protrusions Mold flash protrusions shall exceed 0.15mm (.066 inc) ONLY DATA BOOK.
Information furnished believed accurate reliable. However, STMicroelectronics assumes responsibil consequences such information infring ement patents other righ third parties which result from use. license granted implication otherwise under patent patent rights STMicroelectronics. Specifications mentioned this publication subject change witho notice. This publ ication supersedes replaces information previously supplied. STMicroelectronics products authorized critical components life suppo devices systems withou express written approval STMicroelectronics. logo registered trademark STMicroelectronics 2001 STMicroelectronics Printed Italy Rights Reserved STMicroelectronics GROUP COMPANIES Australia Brazil Canada China Finland France Germany Hong Kong India Israel Italy Japan Malaysia Malta Morocco Singapore Spain Sweden Swit zerland United Kingdom United States http://www. st.com
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