TL H 8562
LP124LP2902LP324
Micropower
Quad
Operational
Amplifier
February 1995
LP124 LP2902 LP324 Micropower Quad
Operational Amplifier
General Description
The LP124 series consists of four independent high gain
internally compensated micropower operational amplifiers
These amplifiers are specially suited for operation in battery
systems while maintaining good input specifications and
extremely low supply current drain In addition the LP124
has an input common mode range and output source range
which includes ground making it ideal in single supply appli-
cations
These amplifiers are ideal in applications which include por-
table instrumentation battery backup equipment and other
circuits which require good DC performance and low supply
current
Features
Y
Low supply current
125 mA (max)
Y
Low offset voltage
2 mV (max)
Y
Low input bias current
4 nA (max)
Y
Input common mode to GND
Y
Interfaces to CMOS logic
Y
Wide supply range
3V
k
V
a
k
32V
Y
Small Outline Package available
Y
Pin-for-pin compatible with LM124
Connection Diagram
Dual-in-Line (J N) and SO (M)
TL H 8562 1
Order Number LP124J or LP324J
See NS Package Number J14A
Order Number LP324M or LP2902M
See NS Package Number M14A
Order Number LP324N or LP2902N
See NS Package Number N14A
Simplified Schematic
TL H 8562 2
C1996 National Semiconductor Corporation
RRD-B30M56 Printed in U S A
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Absolute Maximum Ratings
If Military Aerospace specified devices are required
please contact the National Semiconductor Sales
Office Distributors for availability and specifications
Supply Voltage
32V or
g
16V
LP2902
26V or
g
13V
Differential Input Voltage
32V
LP2902
26V
Input Voltage (Note 1)
b
0 3V to 32V
LP2902
b
0 3V to 26V
Output Short-Circuit to GND
Continuous
(One Amplifier) (Note 2)
V
a
s
15V and T
A
e
25 C
ESD Susceptibility (Note 9)
g
500V
Operating Conditions
Package
J
N
M
Power Dissipation
500 mW
500 mW
500 mW
(Note 3)
T
j
Max
150 C
150 C
150 C
i
ja
90 C W
90 C W
140 C W
Operating Temp Range
(Note 4)
(Note 4)
(Note 4)
Storage Temp Range
b
65 C
s
T
s
150 C
Soldering
Information (10 sec )
300 C
260 C
Vapor Phase (60 sec )
215 C
Infrared (15 sec )
220 C
Electrical Characteristics
(Note 5)
LP124
LP2902 (Note 8)
LP324
Symbol
Parameter
Conditions
Tested
Design
Tested
Design
Tested
Design
Units
Typ
Limit
Limit
Typ
Limit
Limit
Typ
Limit
Limit
Limits
(Note 6)
(Note 7)
(Note 6)
(Note 7)
(Note 6)
(Note 7)
V
os
Input Offset
1
2
7
2
4
10
2
4
9
mV
Voltage
4
(Max)
I
b
Input Bias
1
4
8
2
20
40
2
10
20
nA
Current
8
(Max)
I
os
Input Offset
0 1
1
2
0 5
4
8
0 2
2
4
nA
Current
2
(Max)
A
vol
Voltage
R
L
e
10k
100
70
60
70
40
30
100
50
40
V mV
Gain
to GND
60
(Min)
V
a
e
30V
CMRR
Common
V
a
e
30V
100
85
75
90
80
75
90
80
75
dB
Mode Rej
0V
s
V
cm
80
(Min)
Ratio
V
cm
k
V
a
b
1 5
PSRR
Power
V
a
e
5V to 30V 100
85
75
90
80
75
90
80
75
dB
Supply Rej
80
(Min)
Ratio
I
s
Supply
R
L
e
%
85
125
200
85
150
250
85
150
250
m
A
Current
150
(Max)
V
o
Output
I
L
e
350 mA
3 6
3 4
V
a
b
1 9V 3 6
3 4
V
a
b
1 9V 3 6
3 4
V
a
b
1 9V
V
Voltage
to GND
3 1
(Min)
Swing
V
cm
e
0V
I
L
e
350 mA
0 7
0 8
1 0
0 7
0 8
1 0
0 7
0 8
1 0
V
to V
a
1 0
(Max)
V
cm
e
0V
I
out
Output
V
o
e
3V
11
9
4
10
7
4
10
7
4
mA
Source
Source
V
in
(diff)
e
1V
4
(Min)
Current
I
out
Output
V
o
e
1 5V
6
5
4
5
4
3
5
4
3
mA
Sink
Sink
V
in
(diff)
e
1V
4
(Min)
Current
I
out
Output
V
o
e
1 5V
5
3
1 5
4
2
1
4
2
1
mA
Sink
Sink
V
cm
e
0V
0 5
(Min)
Current
I
source
Output
V
in
(diff)
e
1V
20
25
35
20
25
35
20
25
35
mA
Short to GND
35
35
35
(Max)
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Electrical Characteristics
(Note 5) (Continued)
LP124
LP2902 (Note 8)
LP324
Symbol
Parameter
Conditions
Tested
Design
Tested
Design
Tested
Design
Units
Typ
Limit
Limit
Typ
Limit
Limit
Typ
Limit
Limit
Limits
(Note 6)
(Note 7)
(Note 6)
(Note 7)
(Note 6)
(Note 7)
I
sink
Output
V
in
(diff)
e
1V
15
30
45
15
30
45
15
30
45
mA
Short to V
a
40
(Max)
V
os
7
10
10
m
V C
Drift
I
os
5
10
10
pA C
Drift
GBW
Gain
Bandwidth
100
100
100
KHz
Product
S
r
Slew Rate
50
50
50
V mS
Note 1
The input voltage is not allowed to go more than
b
0 3V below V
b
(GND) as this will turn on a parasitic transistor causing large currents to flow through the
device
Note 2
Short circuits from the output to GND can cause excessive heating and eventual destruction The maximum sourcing output current is approximately 30 mA
independent of the magnitude of V
a
At values of supply voltage in excess of 15 V
DC
continuous short-circuit to GND can exceed the power dissipation ratings
(particularly at elevated temperatures) and cause eventual destruction Destructive dissipation can result from simultaneous shorts on all amplifiers
Note 3
For operation at elevated temperatures these devices must be derated based on a thermal resistance of i
ja
and T
j
max T
j
e
T
A
a
i
ja
P
D
Note 4
The LP124 may be operated from
b
55 C
s
T
A
s a
125 C The LP2902 may be operated from
b
40 C
s
T
A
s a
85 C and the LP324 may be operated
from 0 C
s
T
A
s a
70 C
Note 5 Boldface numbers apply at temperature extremes
All other numbers apply only at T
A
e
T
j
e
25 C V
a
e
5V V
cm
e
V 2 and R
L
e
100k
connected to GND unless otherwise specified
Note 6
Guaranteed and 100% production tested
Note 7
Guaranteed (but not 100% production tested) over the operating supply voltage range (3 0V to 32V for the LP124 LP324 and 3 0V to 26V for the LP2902)
and the common mode range (0V to V
a
b
1 5V) unless otherwise specified These limits are not used to calculate outgoing quality levels
Note 8
The LP2902 operating supply range is 3V to 26V and is not tested above 26V
Note 9
The test circuit used consists of the human body model of 100 pF in series with 1500X
Typical Performance Curves
Input Voltage Range
Input Current
Supply Current
Voltage Gain
Frequency Response
Open Loop
Rejection Ratio
Power Supply
TL H 8562 18
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Typical Performance Curves
(Continued)
Pulse Response
Voltage Follower
Response (Small Signal)
Voltage Follower Pulse
Rejection Ratio
Common Mode
TL H 8562 20
Frequency Response
Large Signal
Current Sourcing
Output Characteristics
Current Sinking
Output Characteristics
Current Limiting
TL H 8562 19
Application Hints
The LP124 series is a micro-power pin-for-pin equivalent to
the LM124 op amps Power supply current input bias cur-
rent and input offset current have all been reduced by a
factor of 10 over the LM124 Like its predecessor the
LP124 series op amps can operate on single supply have
true-differential inputs and remain in the linear mode with
an input common-mode voltage of 0 V
DC
The pinouts of the package have been designed to simplify
PC board layouts Inverting inputs are adjacent to outputs
for all of the amplifiers and the outputs have also been
placed at the corners of the package (pins 1 7 8 and 14)
Precautions should be taken to insure that the power supply
for the integrated circuit never becomes reversed in polarity
or the unit is not inadvertently installed backwards in the
test socket as an unlimited current surge through the result-
ing forward diode within the IC could destroy the unit
Large differential input voltages can be easily accommodat-
ed and as input differential voltage protection diodes are
not needed no large input currents result from large differ-
ential input voltages The differential input voltage may be
larger than V
a
without damaging the device Protection
should be provided to prevent the input voltages from going
negative more than
b
0 3 V
DC
(at 25 C) An input clamp
diode with a resistor to the IC input terminal can be used
The amplifiers have a class B output stage which allows the
amplifiers to both source and sink output currents In appli-
cations where crossover distortion is undesirable a resistor
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Application Hints
(Continued)
should be used from the output of the amplifier to ground
The resistor biases the output into class A operation
The LP124 has improved stability margin for driving capaci-
tive loads No special precautions are needed to drive loads
in the 50 pF to 1000 pF range It should be noted however
that since the power supply current has been reduced by a
factor of 10 so also has the slew rate and gain bandwidth
product This reduction can cause reduced performance in
AC applications where the LM124 is being replaced by an
LP124 Such situations usually occur when the LM124 has
been operated near its power bandwidth
Output short circuits either to ground or to the positive pow-
er supply should be of short time duration Units can be
destroyed not as a result of the short circuit current causing
metal fusing but rather due to the large increase in IC chip
dissipation which will cause eventual failure due to exces-
sive junction temperatures For example If all four amplifi-
ers were simultaneously shorted to ground on a 10V supply
the junction temperature would rise by 110 C
Exceeding the negative common-mode limit on either input
will cause a reversal of phase to the output and force
the amplifier to the corresponding high or low state Exceed-
ing the negative common-mode limit on both inputs will
force the amplifier output to a high state Exceeding the
positive common-mode limit on a single input will not
change the phase of the output However if both inputs
exceed the limit the output of the amplifier will be forced to
a low state In neither case does a latch occur since return-
ing the input within the common mode range puts the input
stage and thus the amplifier in a normal operating mode
The circuits presented in the section on typical applications
emphasize operation on only a single power supply voltage
If complementary power supplies are available all of the
standard op amp circuits can be used In general introduc-
ing a pseudo-ground (a bias voltage reference to V
a
2) will
allow operation above and below this value in single power
supply systems Many application circuits are shown which
take advantage of the wide input common-mode voltage
range which includes ground In most cases input biasing is
not required and input voltages which range to ground can
easily be accommodated
Driving CMOS
TL H 8562 3
Comparator with Hysteresis
TL H 8562 6
Non-Inverting Amplifier
TL H 8562 4
Adder Subtractor
TL H 8562 7
Unity Gain Buffer
TL H 8562 5
Positive Integrator
TL H 8562 8
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