ETC LM148D/883B

www.fairchildsemi.com
LM148
Low Power Quad 741 Operational Amplifier
Features
Description
•
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•
•
•
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•
•
The LM148 is a true quad 741. It consists of four
independent high-gain, internally compensated, low-power
operational amplifiers which have been designed to provide
functional characteristics identical to those of the familiar
741 operational amplifier. In addition, the total supply
current for all four amplifiers is comparable to the supply
current of a single 741 type op amp. Other features include
input offset currents and input bias currents which are much
less than those of a standard 741. Also, excellent isolation
between amplifiers has been achieved by independently
biasing each amplifier and using layout techniques which
minimize thermal coupling.
741 op amp operating characteristics
Low supply current drain—0.6 mA/amplifier
Class AB output stage—no crossover distortion
Pin compatible with the LM124
Low input offset voltage—1.0 mV
Low input offset current—4.0 nA
Low input bias current—30 nA
Unity gain bandwidth—1.0 MHz
Channel Separation—120 dB
Input and output overload protection
The LM148 can be used anywhere multiple 741 type
amplifiers are being used and in applications where amplifier
matching or high packing density is required.
Block Diagram
–Input (A)
+Input (A)
A
+
D
+
Output (A)
Output (C)
+
B
+
–Input (B)
+Input (D)
Output (D)
Output (B)
+Input (B)
–Input (D)
C
+Input (C)
–Input (C)
65-148-01
Rev. 1.0.0
LM148
PRODUCT SPECIFICATION
Pin Assignments
Output (A)
–Input (A))
+Input (A)
+VS
+Input (B)
–Input (B)
Output (B)
1
14
2
13
3
12
4
11
5
10
6
9
7
8
Output (D)
–Input (D)
+Input (D)
Ground
+Input (C)
–Input (C)
Output (C)
65-148-02
Absolute Maximum Ratings
Parameter
Min.
Max.
Unit
Supply Voltage
-22
+22
V
44
V
+22
V
Differential Input Voltage
1
Input Voltage
-22
Output Short Circuit Duration2
Indefinite
Storage Temperature Range
-65
+150
°C
Operating Temperature Range
-55
+125
°C
Lead Soldering Temperature (60 sec.)
+300°C
Notes:
1. For supply voltages less than ±15V, the absolute maximum input voltage is equal to the supply voltage.
2. Short circuit to ground on one amplifier only.
Thermal Characteristics
Parameter
Maximum Junction Temperature
Maximum PD TA < 50°C
2
14-Lead Ceramic DIP
+175°C
1042 mW
Thermal Resistance, qJC
60°C/W
Thermal Resistance, qJA
120°C/W
For TA > 50°C derate at
8.33 mW/°C
PRODUCT SPECIFICATION
LM148
Electrical Characteristics
(VS = ±15V and TA = 25°C, unless otherwise noted)
Parameter
Test Conditions
Input Offset Voltage
RS £ 10KW
Min.
Input Offset Current
Input Bias Current
Input Resistance (Differential Mode)1
0.8
Supply Current, All Amplifiers
VS = ±15V
Large Signal Voltage Gain
VS = ±15V, VOUT = ±10V,
RL ³ 2KW
Channel Separation
F = 1 Hz 20 KHz
Typ.
Max.
Unit
1.0
5.0
mV
4.0
25
nA
30
100
2.5
2.4
50
Unity Gain Bandwidth
nA
MW
3.6
160
mA
V/mV
120
dB
1.0
MHz
Phase Margin
60
Degrees
Slew Rate
0.5
V/mS
Short Circuit Current
25
mA
The following specifications apply for VS = ±15V, -55°C £ TA £ +125°C.
Input Offset Voltage
RS £ 10KW
6.0
mV
Input Offset Current
75
nA
Input Bias Current
325
nA
Large Signal Voltage Gain
VS = ±15V, VOUT = 10V,
RL < 2KW
25
Output Voltage Swing
VS = ±15V
RL = 10KW
±12
±13
RL = 2KW
±10
±12
V/mV
V
Input Voltage Range
VS = ±15V
±12
Common Mode Rejection Ratio
RS £ 10KW
70
90
dB
Power Supply Rejection Ratio
RS £ 10KW
77
96
dB
V
Note:
1. Guaranteed by design but not tested.
3
LM148
PRODUCT SPECIFICATION
Typical Performance Characteristics
90
6
80
4
+25 C
3
+125 C
IB (nA)
-55 C
70
VS = ±20V
60
VS = ±15V
50
VS = ±10V
VS = ±5V
40
30
2
±5
±10
±15
±20
±25
65-148-04
1
0
0
20
65-148-03
10
0
-55 -35 -15
±30
+5 +25 +45 +65 +85 +105 +125
±VS (V)
TA (¡C)
Figure 1. Supply Current vs. Supply Voltage
Figure 2. Input Bias Current vs. Temperature
50
15
TA = +25 C
VS =
30
20
65-148-05
10
0
15V
10
VOUT (V)
VOUT P-P (V)
40
0
±5
±10
±15
±20
5
-55 C
+25 C
+125 C
0
±25
0
5
10
15
20
+I SOURCE (mA)
±VS
Figure 3. Output Voltage Swing vs. Supply Voltage
-15
65-148-06
I SY (mA)
5
25
30
Figure 4. Positive Current Limit
Output Voltage vs. Output Source Current
1K
VS = ±15V
VS = 15V
T A = +25 C
100
+25 C
-55 C
-5
0
0
5
10
15
20
25
ISINK (mA)
Figure 5. Negative Current Limit
Output Voltage vs. Output Sink Current
4
30
A V = 10
10
1
0.1
100
A V = 1.0
1K
10K
65-148-08
+125 C
ROUT (W )
A V = 100
65-148-07
VOUT (V)
-10
100K
1M
F (Hz)
Figure 6. Output Impedance vs. Frequency
PRODUCT SPECIFICATION
LM148
Typical Performance Characteristics (continued)
110
120
VS = 15V
T A = +25 C
100
70
LM148
65-148-09
40
20
0
10
100
1K
10K
100K
1M
50
30
10
0
-10
10
10M
LM148
100
1K
10K
F (Hz)
1
F (MHz)
10K
F (Deg)
F
AV
100W
VOUT
65-148-11
AV (dB)
100
90
80
70
60
50
40
30
20
10
0
-10
VS = 15V
T A = +25 C
2K
10
65-148-12
0
10
VOUT (V)
VOUT (mV)
Figure 10. Gain, Phase Test Circuit
VS = 15V
T A = +25 C
AV = 1
100
0
100
0
-100
10
65-148-13
2
3
4
Time ( mS)
Figure 11. Small Signal Pulse Response
Input, Output Voltage vs. Time
5
VIN (V)
-10
VIN (mV)
-100
1
10M
Figure 8. Open Loop Gain vs. Frequency
Figure 9. Gain, Phase vs. Frequency
0
1M
F (Hz)
Figure 7. CMRR vs. Frequency
120
15
10
5
0
-5
-10
-15
-20
-25
-30
-35
0.1
100K
VS = 15V
T A = +25 C
AV = 1
R L 2K
0
-10
0
40
80
120
160
65-148-14
60
65-148-10
AV (dB)
80
CMRR (dB)
VS = 15V
T A = +25 C
90
200
Time ( mS)
Figure 12. Large Signal Pulse Response
Output Voltage vs. Time
5
LM148
PRODUCT SPECIFICATION
Typical Performance Characteristics (continued)
32
20
GBW (MHz)
24
16
12
8
3
2
65-148-15
1
4
0
100
1K
10K
0
-55 -35 -15
100K
65-148-16
VOUT (V)
4
VS = 15V
T A = +25 C
AV = 1
R L = 2K
< 1% Dist.
28
+5 +25 +45 +65 +85 +105 +125
TA (¡C)
F (Hz)
Figure 13. Undistorted Output Voltage
Swing vs. Frequency
Figure 14. Gain Bandwidth Product vs. Temperature
-20
+125 C
3
-VCM (V)
2
-15
+25 C
-55 C
-10
65-148-18
-5
100
+5 +25 +45 +65 +85 +105 +125
-10
TA (¡C)
-15
Figure 15. Slew Rate vs. Temperature
Figure 16. Negative Common Mode
Input Voltage vs. Supply Voltage
160
VS = 15V
T A = +25 C
AV = 1
R L = 2K
0
140
120
en (nV Hz)
VOUT (V)
10
10
0
-10
65-148-19
VIN (V)
-10
0
20 40
60 80 100 120 140 160 180 200
Time ( mS)
Figure 17. Inverting Large Signal Pulse Response
Input, Output Voltage vs. Time
6
-20
-VS (V)
1.6
VS = 15V
T A = +25 C
1.4
1.2
100
1.0
80
60
40
0.8
en
0.6
IN
0.4
20
0
100
0.2
100
IN (pA Hz)
0
-55 -35 -15
65-148-17
1
1K
F (Hz)
0
10K
Figure 18. Input Noise Voltage, Current
Densities vs. Frequency
65-148-20
SR (V/ mS)
4
PRODUCT SPECIFICATION
LM148
Typical Performance Characteristics (continued)
20
TA
+125 C
15
10
65-148-21
+VCM (V)
55 C
5
5
10
15
20
+VS (V)
Figure 19. Positive Common Mode, Input Voltage vs. Supply Voltage
Typical Simulation
+Vs
+Vs
1.803V
RC1
5.3K
C1
5.46 pF
VA
RC2
5.3K
C2*
VH 30 pF
RO1 D3
32W
VOUT
(+)
D1
(-)
RE2
2.712K
RE1
2.712K
VE
Gen
5.9W
R2
100K
VA
GA
150.8m W
VB
GB
247.5m W
RO2
42.87K
RC
21.3
mW
VE
Cc
2.41 pF
RE
9.87M
20.226 µA
bO1 = 112
bO2 = 14
I S = 8 x 10
D4
D2
2.803V
C C VO
46.96W -Vs
65-148-22
-16
-Vs
Figure 20. LM148 Macromodel for Computer Simulation
7
LM148
PRODUCT SPECIFICATION
Applications Discussion
The LM148 is short circuit protected to ground and supplies
continuously when only one of the four amplifiers is shorted.
If multiple shorts occur simultaneously, the unit can be
destroyed due to excessive power dissipation.
The LM148 low power quad operational amplifier exhibits
performance comparable to the popular 741. Substitution
can therefore be made with no change in circuit behavior.
To assure stability and to minimize pickup, feedback resistors should be placed close to the input to maximize the feedback pole frequency (a function of input to ground
capacitance). A good rule of thumb is that the feedback pole
frequency should be 6 times the operating -3.0B frequency.
If less, a lead capacitor should be placed between the output
and input.
The input characteristics of these devices allow differential
voltages which exceed the supplies. Output phase will be
correct as long as one of the inputs is within the operating
common mode range. If both exceed the negative limit, the
output will latch positive. Current limiting resistors should
be used on the inputs in case voltages become excessive.
When capacitive loading becomes much greater than 100pF,
a resistor should be placed between the output and feedback
connection in order to reduce phase shift.
R3
R5
R4
D1
C2
D2
R2
R7
R6
Q1
C3
C1
C1
2
3
LM148
A
1
A1
R1
6
LM148
B
5
R1
7
A2
1
x
K
2 p R1C1
1
1
1
R4R5
+
+
K=
R5
R DS R4
R3
F=
9
10
LM148
C
VOUT
8
A3
65-148-23
R ON
V GS 1/2
1VP
FMAX = 5.0 KHz, THD
0.03%
R1 = 100K pot., C1 = 0.0047 m F, C2 = 0.01 m F, C3 = 0.1 m F, R2 = R6 = R7 = 1M, R3 = 5.1K, R4 = 12W .
R5 = 240 W, Q1 = NS5102, D1 = 1N914, D2 = 3.6V avalanche diode (ex. LM103), V s = 15V
R DS ~
A simpler version with some distortion degradation at high frequencies can be made by using A1
as a simple inverting amplifier, and by putting back to back zeners in feedback loop of A3.
Figure 21. One Decade Low Distortion Sinewave Generator
8
PRODUCT SPECIFICATION
LM148
Applications Discussion (continued)
3
-V IN
2
LM148
A
1
R
R
R1
R/2
9
R/2
LM148
10
B
R
6
5
+VIN
8
V OUT
R2
LM148
C
2R
R1
VS = ±15V
V OUT = 2
7
+ 1 , -VS - 3V
VIN CM
+VS -3V
R = R2, trim R2 to boost CMRR
65-148-24
Figure 22. Low Cost Instrumentation Amplifier
2
VIN
500K
D1
1N941
LM148
A
3
1
D3
6
D2
1N914
5
7
LM148
B
VPEAK
CP
2N2906
Adjust R for minimum drift
D3 low leakage diode
D1 added to improve speed
VS = 15V
R2
2M 10
I BIAS
9
R
1M
2
3
(+VS )
LM148
C
8
I BIAS
65-148-25
Figure 23. Low Voltage Peak Detector with Bias Current Compensation
9
LM148
PRODUCT SPECIFICATION
Applications Discussion (continued)
R5
100K
R6
C1
0.001 m F
10K
C2
0.001 m F
2
VIN
R3
R1
1
LM148
A
3
6
5
R0
LM148
B
R2
7
9
10
VHP
LM148
C
R4
VIN(s)
=
N(s)
FNOTCH =
HOLP =
Q
-Sw0 HOBP
NHP(S) = S2 HOHP, NBP(S) =
FO =
Sw0
D(s) = S2 +
D(s)
1
R6
2p
R5
1
RH
2p
RL t1 t2
RF
13
LM148
D
12
V(s)
VLP
RL
RH
Tune Q through R0
for predictable results: FO Q
4 x104
Use bandpass output to tune for Q
8
14
VBR
+ w 02
NLP = w02 HOLP
Q
1
,
t1 = R1C1, Q =
t1t2
1/2
, HOHP =
1 + R4 | R3 + R4 | R0
R6
t1
1 + R6 | R5
R5
t2
1 + R6 | R5
1 + R3 | R0 + R3 | R4
, HOBP =
1/2
1 + R4 | R3 + R4 | R0
1 + R3 | R0 + R3 | R4
1 + R5 | R6
65-148-26
1 + R3 | R0 + R3 | R4
Figure 24. Universal State-Space Filter
100K
10K
0.001 mF
0.001 mF
2
VIN
150K
3
LM148
A
6
1
50.3K
LM148
B
5
7
50.3K
9
LM148
C
10
4.556K
8
V OUT1
100K
100K
100K
2
3
0.001 mF
10K
LM148
A
1
50.3K
6
5
0.001 mF
LM148
B
7
50.3K
9
10
39.4K
LM148
C
8
V OUT2
100K
65-148-27
Use general equations, and tune each section separately.
Q 1st Section = 0.541, Q 2nd Section = 1.306.
The response should have 0 dB peaking.
Figure 25. 1 KHz 4-Pole Butterworth Filter
10
PRODUCT SPECIFICATION
LM148
Applications Discussion (continued)
R7
R8
R1
C2
2
C1
R2
1
LM148
A
3
R6
6
5
R5
VOUT(S)
LM148
B
R3
7
9
R4
10
LM148
C
8
VIN(S)
Q=
R8
R7
R1C1
, Fo =
R3C2R2C1
Necessary condition for notch :
1
R8
R7
1
2p
R2R3C1C2
, FNOTCH =
1
R6
2p R3R5R7C1C2
R1
1
=
R4R7
R6
Examples: FNOTCH = 3 kHz, Q = 5, R1 = 270K, R2 = R3 = 20K, R4 = 27K, R5 = 20K, R6 = R8 = 10K, R7 = 100K.
C1 = C2 = 0.001 µF.
Better noise performance than the state-space approach.
65-148-28
Figure 26. 3 Amplifier Bi-Quad Notch Filter
R5
100K
Gain vs Frequency
R6
C1
C2
2
3
LM148
A
6
1
R1
5
LM148
B
R2
BP
R0
9
7
RH
AV (dB)
R3
VIN
10
LM148
C
8
R4
0
-10
-20
-30
-40
-50
-60
-70
100
1K
10K
100K
F (Hz)
RL
R'5
R'H
R'6
2
3
LM148
A
BP'
R'1
6
C'1
5
LM148
B
1
7
R'2
C'2
9
10
R'0
R'F
100K
LM148
C
8
13
R'L
12
R'4
LM148
D
14
VOUT
FC = 1 kHz, F S = 2 kHz, F P = 0.543. FZ = 2.14, Q = 0.841, F'P = 0.987, F'Z = 4.92.
Q' = 4.403 normalized to ripple BW.
FP =
RP =
1
2p
R6
R5
1
1
, FZ =
t
2p
RH
RL
1
t
,Q=
1 + R4/R3 + R4/R0
x
1 + R6/R5
R6
R5
, Q' =
1 + R'4/R'0
R'6
x
1 + R'6/R'5 + R'6/RP
R'5
RH R L
RH + R L
Use the B'P outputs to tune Q, Q', tune the 2 sections separately.
R1 = R2 = 92.6K, R3 = R4 = R5 = 100K, R6 = 10K, R0 = 107.8K, RL = 100K, RH = 155.1K,
R'1 = R'2 = 50.9K, R'4 = R'5 = 100K, R'6 = 10K, R'0 = 5.78K, R'L = 100K, R'H = 248.12K, R'F = 100K.
65-148-29
All capacitors are 0.001µF.
Figure 27. 4th Order 1 KHz Elliptic Filter (4 Poles, 4 Zeros)
11
LM148
Notes:
12
PRODUCT SPECIFICATION
PRODUCT SPECIFICATION
LM148
Notes:
13
LM148
Notes:
14
PRODUCT SPECIFICATION
PRODUCT SPECIFICATION
LM148
Mechanical Dimensions
14-Pin Ceramic DIP
Inches
Symbol
Min.
A
b1
b2
c1
D
E
e
eA
L
Q
s1
a
Millimeters
Max.
—
.200
.014
.023
.045
.065
.008
.015
—
.785
.220
.310
.100 BSC
.300 BSC
.125
.200
.015
.060
.005
—
90¡
105¡
Min.
Notes:
Notes
Max.
—
5.08
.36
.58
1.14
1.65
.20
.38
—
19.94
5.59
7.87
2.54 BSC
7.62 BSC
3.18
5.08
.38
1.52
.13
—
90¡
105¡
1. Index area: a notch or a pin one identification mark shall be located
adjacent to pin one. The manufacturer's identification shall not be
used as pin one identification mark.
8
2
2. The minimum limit for dimension "b2" may be .023 (.58mm) for leads
number 1, 7, 8 and 14 only.
8
4
3. Dimension "Q" shall be measured from the seating plane to the base
plane.
4
5, 9
7
4. This dimension allows for off-center lid, meniscus and glass overrun.
3
6
5. The basic pin spacing is .100 (2.54mm) between centerlines. Each
pin centerline shall be located within ±.010 (.25mm) of its exact
longitudinal position relative to pins 1 and 14.
6. Applies to all four corners (leads number 1, 7, 8, and 14).
7. "eA" shall be measured at the center of the lead bends or at the
centerline of the leads when "a" is 90¡.
8. All leads – Increase maximum limit by .003 (.08mm) measured at the
center of the flat, when lead finish applied.
9. Twelve spaces.
D
7
1
8
14
NOTE 1
E
s1
eA
e
A
Q
L
b2
a
c1
b1
15
LM148
PRODUCT SPECIFICATION
Ordering Information
Package
Operating Temperature
Range
LM148D
14-Lead Ceramic DIP
-55°C to +125°C
LM148D/883B
14-Lead Ceramic DIP
-55°C to +125°C
Part Number
Note:
1. 883B suffix denotes Mil-Std-883, Level B processing
LIFE SUPPORT POLICY
FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES
OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD SEMICONDUCTOR
CORPORATION. As used herein:
1. Life support devices or systems are devices or systems
which, (a) are intended for surgical implant into the body,
or (b) support or sustain life, and (c) whose failure to
perform when properly used in accordance with
instructions for use provided in the labeling, can be
reasonably expected to result in a significant injury of the
user.
2. A critical component in any component of a life support
device or system whose failure to perform can be
reasonably expected to cause the failure of the life support
device or system, or to affect its safety or effectiveness.
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5/20/98 0.0m 001
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Ó 1998 Fairchild Semiconductor Corporation