STMICROELECTRONICS LS204CDT

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.
D
SO-8
(Plastic micro package)
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).
June 2008
Pin connections
(top view)
Rev 2
Output 1
1
Inverting input 1
2
-
Non-inverting input 1
3
+
V
CC
- 4
8
VCC+
7
Output 2
-
6
Inverting input 2
+
5
Non-inverting input 2
1/16
www.st.com
16
Circuit schematics
1
Circuit schematics
Figure 1.
Schematic diagram (1/2 LS204)
2/16
LS204
LS204
Absolute maximum ratings and operating conditions
2
Absolute maximum ratings and operating conditions
Table 1.
Absolute maximum ratings
Symbol
Value
Unit
±18
V
±VCC
V
±(VCC-1)
V
Rthja
Thermal resistance junction to ambient(4)
SO-8
DIP8
125
85
°C/W
Rthjc
Thermal resistance junction to case(4)
SO-8
DIP8
40
41
°C/W
VCC
Vi
Vid
Parameter
Supply voltage(1)
Input voltage
(2)
(3)
Differential input voltage
Output short-circuit duration(5)
Tj
Tstg
Junction temperature
Storage temperature range
HBM: human body
ESD
Infinite
150
°C
-65 to +150
°C
2
kV
200
V
1.5
kV
model(6)
MM: machine model
(7)
(8)
CDM: charged device model
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 kΩ 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 Ω). 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.
Operating conditions
Symbol
Parameter
VCC
Supply voltage
Vicm
Common mode input voltage range
Toper
Operating free-air temperature range
LS204C
LS204I
Unit
6 to 30
V
VDD+1.5 to VCC-1.5
V
0 to +70
-40 to +105
°C
3/16
Electrical characteristics
LS204
3
Electrical characteristics
Table 3.
Electrical characteristics at VCC = ±15 V, Tamb = +25° C (unless otherwise specified)
LS204I
Symbol
LS204C
Parameter
Unit
Min. Typ. Max. Min. Typ. Max.
ICC
Supply current
0.7
1.2
0.8
1.5
mA
Iib
Input bias current
Tmin < Tamb < Tmax
50
150
300
100
300
700
nA
Ri
Input resistance (F = 1kHz)
1
Vio
Input offset voltage (Rs ≤ 10kΩ)
Tmin < Tamb < Tmax
DVio
Iio
0.5
Input offset voltage drift (Rs ≤ 10kΩ) Tmin < Tamb < Tmax
5
Input offset current
Tmin < Tamb < Tmax
5
DIio
Input offset current drift Tmin < Tamb < Tmax
Ios
Output short-circuit current
Avd
Large signal voltage gain Tmin < Tamb < Tmax
RL = 2kΩ, VCC = ±15V
RL = 2kΩ, VCC = ±4V
90
100
95
Gain bandwidth product (F =100kHz)
1.8
3
GBP
en
Equivalent input noise voltage F = 1kHz, Rs = 100Ω
Rs = 50Ω
Rs = 1kΩ
Rs = 10kΩ
THD
Total harmonic distortion (F = 1kHz, Av = 20dB, RL = 2kΩ,
Vo = 2Vpp)
±Vopp
Output voltage swing
RL = 2kΩ, VCC = ±15V
RL = 2kΩ, VCC = ±4V
1
2.5
3.5
0.5
MΩ
3.5
5
5
20
40
12
mV
µV/°C
50
100
nA
0.08
0.1
nA/°C
23
23
mA
86
100
95
dB
1.5
2.5
MHz
8
10
18
10
12
20
nV
-----------Hz
0.03
0.03
%
±13
±13
V
±3
±3
28
28
Vpp
1.5
1
V/µs
Vopp
Large signal voltage swing RL = 10kΩ, F= 10kHz
SR
Slew rate (RL = 2kΩ, unity gain)
0.8
SVR
Supply voltage rejection ratio Tmin < Tamb < Tmax
90
86
dB
CMR
Common mode rejection ratio Vic = ±10V
Tmin < Tamb < Tmax
90
86
dB
Vo1/Vo2 Channel separation (F= 1 kHz)
4/16
100
120
120
dB
LS204
Electrical characteristics
Figure 2.
Supply current versus supply
voltage
Figure 3.
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
Supply voltage rejection versus
frequency
Figure 7.
Supply current versus ambient
temperature
5/16
Electrical characteristics
Figure 8.
Large signal frequency response
LS204
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)
6/16
LS204
Application information for active low-pass filters
4
Application information for active low-pass filters
4.1
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:
4.2
●
Flattest possible amplitude response
●
Excellent gain accuracy at low frequency end of passband
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 π radians,
The maximum phase shift is –---------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
-3 dB frequency
2 Poles
4 Poles
6 Poles
8 Poles
0.77 Fc
0.67 Fc
0.57 Fc
0.50 Fc
Other characteristics:
4.3
●
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 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.
7/16
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
4.4
Peak overshoot
% Overshoot
±1%
±0.1%
±0.01%
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
Butterworth
2
4
6
8
4
11
14
14
Bessel
2
4
6
8
0.4
0.8
0.6
0.1
0.8/Fc
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
4
6
8
11
18
21
23
1.1/Fc
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
4
6
8
21
28
32
34
1.6/Fc
4.8/Fc
8.2/Fc
11.6/Fc
2.7/Fc
8.4/Fc
16.3/Fc
24.8/Fc
-
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 ζ
C1 = ---- -----R ωc
1 1
C2 = ---- ----------R ξ ωc
8/16
Settling time (% of final value)
LS204
Application information for active low-pass filters
Figure 13. Filter configuration
C2
R1
R2
Vin
Vout
C1
Three parameters are needed to characterize the frequency and phase response of a 2nd
order active filter:
●
the gain (Gv),
●
the damping factor (ξ ) or the Q factor (Q = 2 ξ )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 ξ (or Q factor) determines the filter response (see Table 6).
Table 6.
Filter response to ξ or Q factor
Filter response
ξ
Q
Bessel
3
------2
1
------3
Frequency at which phase shift is -90°C
Butterworth
2
------2
1
------2
Frequency at which Gv = -3 dB
Chebyschev
2
------2
1
------2
Cut-off frequency (Fc)
Frequency at which the amplitude response passes through
specified max. ripple band and enters the stop bank.
9/16
Application information for active low-pass filters
4.5
LS204
Example
Figure 14. 5th order low-pass filter (Butterworth) with unity gain configuration
C2
Ri
R1
C4
R2
R3
Ci
R4
C1
C3
In the circuit of Figure 14, for Fc = 3.4 kHz and Ri = R1 = R2 = R3 = 10 kW, we obtain:
1 1
Ci = 1.354 ---- ------------ = 6.33nF
R 2πfc
1 1
C1 = 0.421 ---- ------------ = 1.97nF
R 2πfc
1 1
C2 = 1.753 ---- ------------ = 8.20nF
R 2πfc
1 1
C3 = 0.309 ---- ------------ = 1.45nF
R 2πfc
1 1
C4 = 3.325 ---- ------------ = 15.14nF
R 2πfc
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
1 1
Ri = --------------- ---- ------------ = 25.5kΩ
0.354 C 2πfc
1
1 1
R1 = --------------- ---- ------------ = 75.6kΩ
0.421 C 2πfc
1
1 1
R2 = --------------- ---- ------------ = 18.2kΩ
1.753 C 2πfc
1
1 1
R3 = --------------- ---- ------------ = 103kΩ
0.309 C 2πfc
1
1 1
R4 = --------------- ---- ------------ = 9.6kΩ
3.325 C 2πfc
Figure 15. 5th order high-pass filter (Butterworth) with unity gain configuration
R2
Ci
C1
R4
C2
C3
Ri
10/16
C4
R1
R3
LS204
Application information for active low-pass filters
Table 7.
Damping factor for low-pass Butterworth filters
Order
Ci
2
3
1.392
4
5
1.354
6
7
8
1.336
C1
C2
C3
C4
0.707
1.41
0.202
3.54
0.92
C5
C6
1.08
0.38
2.61
0.421
1.75
0.309
3.235
0.966
1.035
0.707
1.414
0.259
3.86
0.488
1.53
0.623
1.604
0.222
4.49
0.98
1.02
0.83
1.20
0.556
1.80
C7
C8
0.195
5.125
11/16
Package information
5
LS204
Package information
In order to meet environmental requirements, STMicroelectronics offers these devices in
ECOPACK® 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.
12/16
LS204
5.1
Package information
DIP8 package information
Figure 16. DIP8 package mechanical drawing
Table 8.
DIP8 package mechanical data
Dimensions
Ref.
Millimeters
Min.
Typ.
A
Inches
Max.
Min.
Typ.
5.33
Max.
0.210
A1
0.38
0.015
A2
2.92
3.30
4.95
0.115
0.130
0.195
b
0.36
0.46
0.56
0.014
0.018
0.022
b2
1.14
1.52
1.78
0.045
0.060
0.070
c
0.20
0.25
0.36
0.008
0.010
0.014
D
9.02
9.27
10.16
0.355
0.365
0.400
E
7.62
7.87
8.26
0.300
0.310
0.325
E1
6.10
6.35
7.11
0.240
0.250
0.280
e
2.54
0.100
eA
7.62
0.300
eB
L
10.92
2.92
3.30
3.81
0.430
0.115
0.130
0.150
13/16
Package information
5.2
LS204
SO-8 package information
Figure 17. SO-8 package mechanical drawing
Table 9.
SO-8 package mechanical data
Dimensions
Ref.
Millimeters
Min.
Typ.
A
Max.
Min.
Typ.
1.75
0.25
Max.
0.069
A1
0.10
A2
1.25
b
0.28
0.48
0.011
0.019
c
0.17
0.23
0.007
0.010
D
4.80
4.90
5.00
0.189
0.193
0.197
E
5.80
6.00
6.20
0.228
0.236
0.244
E1
3.80
3.90
4.00
0.150
0.154
0.157
e
0.004
0.010
0.049
1.27
0.050
h
0.25
0.50
0.010
0.020
L
0.40
1.27
0.016
0.050
k
1°
8°
1°
8°
ccc
14/16
Inches
0.10
0.004
LS204
6
Ordering information
Ordering information
Table 10.
Order codes
Order code
Temperature
range
Package
Packing
Marking
DIP8
Tape
LS204CN
SO-8
Tape or
Tape & reel
204C
DIP8
Tape
LS204IBN
SO-8
Tape or
Tape & reel
204I
SO-8
(Automotive grade)
Tape or
Tape & reel
204IYD
LS204CN
0°C, +70°C
LS204CD
LS204CDT
LS204IN
LS204ID
LS204IDT
-40°C, +105°C
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.
Document revision history
Date
Revision
Changes
29-Nov-2001
1
Initial release.
4-Jun-2008
2
Updated document format.
Added automotive grade order codes.
15/16
LS204
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