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LS204
High performance dual operational amplifier
Features

Low power consumption Short-circuit protection Low distortion, low noise High gain-bandwidth product High channel separation
N DIP8 (Plastic package)
Description
The LS204 is a high performance dual operational amplifier with frequency and phase compensation built into the chip. The internal phase compensation 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 particularly intended for professional and telecom applications (such as active filtering).
D SO-8 (Plastic micro package)
Pin connections (top view)
Output 1
Inverting input 1 Non-inverting input 1 V CC
1 2 3
+ +
8 7 6 5
VCC+
Output 2 Inverting input 2 Non-inverting input 2
-4
June 2008
Rev 2
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Circuit schematics
LS204
1
Figure 1.
Circuit schematics
Schematic diagram (1/2 LS204)
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LS204
Absolute maximum ratings and operating conditions
2
Table 1.
Symbol VCC Vi Vid Rthja
Absolute maximum ratings and operating conditions
Absolute maximum ratings
Parameter Supply voltage(1) Input voltage
(2) (3)
Value 18 VCC (VCC-1) 125 85 40 41 Infinite 150 -65 to +150 2 200
Unit V V V C/W
Differential input voltage
Thermal resistance junction to ambient(4) SO-8 DIP8 Thermal resistance junction to case(4) SO-8 DIP8 Output short-circuit duration(5)
Rthjc
C/W
Tj Tstg
Junction temperature Storage temperature range HBM: human body model(6)
(7) (8)
C C kV V kV
ESD
MM: machine model
CDM: charged device model
1.5
1. All voltage values, except differential voltage, are with respect to the zero reference level (ground) of the supply voltages where the zero reference level is the midpoint between VCC+ and VCC-. 2. The magnitude of the input voltage must never exceed the magnitude of the supply voltage or 15 volts, whichever is less. 3. Differential voltages are the non-inverting input terminal with respect to the inverting input terminal. 4. Short-circuits can cause excessive heating and destructive dissipation. Values are typical. 5. The output may be shorted to ground or to either supply. Temperature and/or supply voltages must be limited to ensure that the dissipation rating is not exceeded. 6. Human body model: A 100 pF capacitor is charged to the specified voltage, then discharged through a 1.5 k resistor between two pins of the device. This is done for all couples of connected pin combinations while the other pins are floating. 7. Machine model: A 200 pF capacitor is charged to the specified voltage, then discharged directly between two pins of the device with no external series resistor (internal resistor < 5 ). This is done for all couples of connected pin combinations while the other pins are floating. 8. Charged device model: all pins and the package are charged together to the specified voltage and then discharged directly to the ground through only one pin. This is done for all pins.
Table 2.
Symbol VCC Vicm Toper
Operating conditions
Parameter Supply voltage Common mode input voltage range Operating free-air temperature range LS204C 6 to 30 VDD+1.5 to VCC-1.5 0 to +70 -40 to +105 LS204I Unit V V C
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Electrical characteristics
LS204
3
Table 3.
Symbol ICC Iib Ri Vio DVio Iio DIio Ios Avd GBP
Electrical characteristics
Electrical characteristics at VCC = 15 V, Tamb = +25 C (unless otherwise specified)
LS204I Parameter Min. Typ. Max. Min. Typ. Max. Supply current Input bias current Tmin < Tamb < Tmax Input resistance (F = 1kHz) Input offset voltage (Rs 10k) Tmin < Tamb < Tmax Input offset voltage drift (Rs 10k) Tmin < Tamb < Tmax Input offset current Tmin < Tamb < Tmax Input offset current drift Tmin < Tamb < Tmax Output short-circuit current Large signal voltage gain Tmin < Tamb < Tmax RL = 2k, VCC = 15V RL = 2k, VCC = 4V Gain bandwidth product (F =100kHz) Equivalent input noise voltage F = 1kHz, Rs = 100 Rs = 50 Rs = 1k Rs = 10k Total harmonic distortion (F = 1kHz, Av = 20dB, RL = 2k, Vo = 2Vpp) Output voltage swing , RL = 2k VCC = 15V , RL = 2k VCC = 4V Large signal voltage swing RL = 10k F= 10kHz , Slew rate (RL = 2k unity gain) , Supply voltage rejection ratio Tmin < Tamb < Tmax Common mode rejection ratio Vic = 10V Tmin < Tamb < Tmax 0.8 90 90 100 120 13 3 28 1.5 86 86 120 90 1.8 0.7 50 1 0.5 5 5 0.08 23 100 95 3 8 10 18 0.03 86 1.5 20 40 2.5 3.5 1.2 150 300 0.8 100 1 0.5 5 12 0.1 23 100 95 2.5 10 12 20 0.03 50 100 3.5 5 1.5 300 700 mA nA M mV V/C nA nA/C mA LS204C Unit
dB MHz
en
nV ----------Hz
THD
%
Vopp Vopp SR SVR CMR
13 3 28 1
V Vpp V/s dB dB dB
Vo1/Vo2 Channel separation (F= 1 kHz)
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LS204
Electrical characteristics
Figure 2.
Supply current versus supply voltage
Figure 3.
Supply current versus ambient temperature
Figure 4.
Output short circuit current versus Figure 5. ambient temperature
Open loop frequency and phase response
Figure 6.
Output loop gain versus ambient temperature
Figure 7.
Supply voltage rejection versus frequency
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Electrical characteristics
LS204
Figure 8.
Large signal frequency response
Figure 9.
Output voltage swing versus load resistance
Figure 10. Total input noise versus frequency Figure 11. Amplitude response
Figure 12. Amplitude response ( 1dB ripple)
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LS204
Application information for active low-pass filters
4
4.1
Application information for active low-pass filters
Butterworth
The Butterworth is a "maximally flat" amplitude response filter (Figure 11). 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 3 dB. The attenuation rate beyond the cut-off 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
4.2
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. The maximum phase shift is - n radians, ---------2
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. Table 4 can be used to obtain the -3 dB frequency of the filter. Table 4. -3 dB frequency of the filter
2 Poles -3 dB frequency 0.77 Fc 4 Poles 0.67 Fc 6 Poles 0.57 Fc 8 Poles 0.50 Fc
Other characteristics:

Selectivity not as great as Chebyschev or Butterworth Very little overshoot response to step inputs Fast rise time
4.3
Chebyschev
Chebyschev filters have greater selectivity than either Bessel or Butterworth at the expense of ripple in the passband (Figure 12). Chebyschev filters are normally designed with peak-to-peak ripple values from 0.2 dB to 2 dB.
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Application information for active low-pass filters
LS204
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 specified maximum ripple band and enters the stop band. Other characteristics:

Greater selectivity Very non-linear phase response High overshoot response to step inputs
Table 5 shows the typical overshoot and setting time response of the low pass filters to a step input. Table 5. Overshoot and setting time response of low pass filters to step input
Number of poles 2 4 6 8 2 4 6 8 2 4 6 8 2 4 6 8 Peak overshoot % Overshoot 4 11 14 14 0.4 0.8 0.6 0.1 11 18 21 23 21 28 32 34 Settling time (% of final value) 1% 0.1% 0.01%
Butterworth
1.1Fc sec. 1.7Fc sec. 1.9Fc sec. 2.8/Fc 3.8/Fc 1.7/Fc 2.4/Fc 3.9S/Fc 5.0S/Fc 3.1/Fc 5.1/Fc 7.1/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 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 1.7/Fc 2.4/Fc 2.7/Fc 3.2/Fc -
Bessel
Chebyschev (ripple 0.25dB)
Chebyschev (ripple 1dB)
4.4
Design of 2nd order active low pass filter (Sallen and Key configuration unity gain op-amp)
For fixed R = R1 = R2, we have (see Figure 13):
1 C1 = --- -----R c 11 C2 = --- ---------R c
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LS204 Figure 13. Filter configuration
Application information for active low-pass filters
C2
R1 Vin
R2 C1 Vout
Three parameters are needed to characterize the frequency and phase response of a 2nd order active filter:

the gain (Gv), the damping factor ( ) or the Q factor (Q = 2 )1), the cut-off frequency (Fc).
The higher order response is obtained with a series of 2nd order sections. A simple RC section is introduced when an odd filter is required. The choice of (or Q factor) determines the filter response (see Table 6). Table 6. Filter response to or Q factor
3 -----2
Filter response
Q
Cut-off frequency (Fc)
Bessel
1 -----3
Frequency at which phase shift is -90C
Butterworth
2 -----2
1 -----2
Frequency at which Gv = -3 dB
Chebyschev
2 -----2
1 -----2
Frequency at which the amplitude response passes through specified max. ripple band and enters the stop bank.
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Application information for active low-pass filters
LS204
4.5
Example
Figure 14. 5th order low-pass filter (Butterworth) with unity gain configuration
C2 C4
Ri Ci
R1
R2 R3 C1 C3 R4
In the circuit of Figure 14, for Fc = 3.4 kHz and Ri = R1 = R2 = R3 = 10 kW, we obtain:
11 Ci = 1.354 --- ----------- = 6.33nF R 2fc 11 C1 = 0.421 --- ----------- = 1.97nF R 2fc 11 C2 = 1.753 --- ----------- = 8.20nF R 2fc 11 C3 = 0.309 --- ----------- = 1.45nF R 2fc 11 C4 = 3.325 --- ----------- = 15.14nF R 2fc
The attenuation of the filter is 30 dB at 6.8 kHz and better than 60 dB at 15 kHz. The same method, referring to Table 7 and Figure 15 is used to design high-pass filters. In this case the damping factor is found by taking the reciprocal of the numbers in Table 7. For Fc = 5 kHz and Ci = C1 = C2 = C3 = 1 nF we obtain:
1 11 Ri = -------------- --- ----------- = 25.5k -0.354 C 2fc 1 11 R1 = -------------- --- ----------- = 75.6k -0.421 C 2fc 1 11 R2 = -------------- --- ----------- = 18.2k -1.753 C 2fc 1 11 R3 = -------------- --- ----------- = 103k -0.309 C 2fc 1 11 R4 = -------------- --- ----------- = 9.6k -3.325 C 2fc
Figure 15. 5th order high-pass filter (Butterworth) with unity gain configuration
R2 R4
Ci
C1
C2 C3 C4 R3 R1
Ri
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LS204 Table 7.
Order 2 3 4 5 6 7 8 1.336 1.354 1.392
Application information for active low-pass filters Damping factor for low-pass Butterworth filters
Ci C1 0.707 0.202 0.92 0.421 0.966 0.488 0.98 C2 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 C3 C4 C5 C6 C7 C8
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Package information
LS204
5
Package information
In order to meet environmental requirements, STMicroelectronics offers these devices in ECOPACK(R) packages. These packages have a lead-free second level interconnect. The category of second level interconnect is marked on the package and on the inner box label, in compliance with JEDEC Standard JESD97. The maximum ratings related to soldering conditions are also marked on the inner box label. ECOPACK is an STMicroelectronics trademark. ECOPACK specifications are available at: www.st.com.
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LS204
Package information
5.1
DIP8 package information
Figure 16. DIP8 package mechanical drawing
Table 8.
DIP8 package mechanical data
Dimensions
Ref. Min. A A1 A2 b b2 c D E E1 e eA eB L 2.92 0.38 2.92 0.36 1.14 0.20 9.02 7.62 6.10
Millimeters Typ. Max. 5.33 0.015 3.30 0.46 1.52 0.25 9.27 7.87 6.35 2.54 7.62 10.92 3.30 3.81 0.115 4.95 0.56 1.78 0.36 10.16 8.26 7.11 0.115 0.014 0.045 0.008 0.355 0.300 0.240 Min.
Inches Typ. Max. 0.210
0.130 0.018 0.060 0.010 0.365 0.310 0.250 0.100 0.300
0.195 0.022 0.070 0.014 0.400 0.325 0.280
0.430 0.130 0.150
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Package information
LS204
5.2
SO-8 package information
Figure 17. SO-8 package mechanical drawing
Table 9.
SO-8 package mechanical data
Dimensions
Ref. Min. A A1 A2 b c D E E1 e h L k ccc 0.25 0.40 1 0.10 1.25 0.28 0.17 4.80 5.80 3.80
Millimeters Typ. Max. 1.75 0.25 0.004 0.049 0.48 0.23 4.90 6.00 3.90 1.27 0.50 1.27 8 0.10 0.010 0.016 1 5.00 6.20 4.00 0.011 0.007 0.189 0.228 0.150 Min.
Inches Typ. Max. 0.069 0.010
0.019 0.010 0.193 0.236 0.154 0.050 0.020 0.050 8 0.004 0.197 0.244 0.157
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LS204
Ordering information
6
Ordering information
Table 10. Order codes
Temperature range Package DIP8 0C, +70C SO-8 DIP8 -40C, +105C SO-8 SO-8 (Automotive grade) Packing Tape Tape or Tape & reel Tape Tape or Tape & reel Tape or Tape & reel Marking LS204CN 204C LS204IBN 204I 204IYD
Order code LS204CN LS204CD LS204CDT LS204IN LS204ID LS204IDT LS204IYD(1) LS204IYDT(1)
1. Qualification and characterization according to AEC Q100 and Q003 or equivalent, advanced screening according to AEC Q001 & Q 002 or equivalent are on-going.
7
Revision history
Table 11.
Date 29-Nov-2001 4-Jun-2008
Document revision history
Revision 1 2 Initial release. Updated document format. Added automotive grade order codes. Changes
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LS204
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