NSC LP2902N Micropower quad operational amplifier Datasheet

LP2902/LP324
Micropower Quad Operational Amplifier
General Description
Features
The LP324 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 LP324 has
an input common mode range, and output source range
which includes ground, making it ideal in single supply applications.
These amplifiers are ideal in applications which include portable instrumentation, battery backup equipment, and other
circuits which require good DC performance and low supply
current.
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Connection Diagram
Simplified Schematic
Low supply current: 125 µA (max)
Low offset voltage: 2 mV (max)
Low input bias current: 4 nA (max)
Input common mode to GND
Interfaces to CMOS logic
Wide supply range: 3V < V+ < 32V
Small Outline Package available
Pin-for-pin compatible with LM324
Dual-In-Line (N) and SO (M)
DS008562-1
Order Number LP324M or LP2902M
See NS Package Number M14A
Order Number LP324N or LP2902N
See NS Package Number N14A
© 1999 National Semiconductor Corporation
DS008562
DS008562-2
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LP2902/LP324 Micropower Quad Operational Amplifier
September 1999
Absolute Maximum Ratings (Note 1)
Operating Conditions
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Power Dissipation
(Note 4)
Tj Max
θja
Operating Temp. Range
Storage Temp. Range
Soldering
Information (10 sec.)
Vapor Phase (60 sec.)
Infrared (15 sec.)
32V or ± 16V
26V or ± 13V
32V
26V
−0.3V to 32V
−0.3V to 26V
Continuous
Supply Voltage
LP2902
Differential Input Voltage
LP2902
Input Voltage (Note 2)
LP2902
Output Short-Circuit to GND
(One Amplifier) (Note 3)
V+ ≤ 15V and TA = 25˚C
ESD Susceptibility (Note 10)
± 500V
Package
N
500 mW
M
500 mW
150˚C
150˚C
90˚C/W
140˚C/W
(Note 5)
(Note 5)
−65˚C ≤ T ≤ 150˚C
300˚C
260˚C
215˚C
220˚C
Electrical Characteristics (Note 6)
LP2902 (Note 9)
Symbol
Parameter
Conditions
Typ
Vos
Input Offset
2
LP324
Tested
Design
Limit
Limit
(Note 7)
(Note 8)
4
10
Typ
2
Tested
Design
Units
Limit
Limit
Limits
(Note 7)
(Note 8)
4
9
Voltage
Ib
Input Bias
2
20
40
2
10
20
Current
Ios
nA
(Max)
Input Offset
0.5
4
8
0.2
2
4
Current
Avol
mV
(Max)
nA
(Max)
Voltage
RL = 10k
Gain
to GND
70
40
30
100
50
40
V/mV
(Min)
V+ = 30V
CMRR
PSRR
Common
V+ = 30V
Mode Rej.
0V ≤ Vcm
Ratio
Vcm < V+− 1.5
Power
V+ = 5V to 30V
90
80
75
90
80
75
dB
(Min)
90
80
75
90
80
75
Supply Rej.
dB
(Min)
Ratio
Is
Supply
RL = ∞
85
150
250
85
150
250
Current
Vo
µA
(Max)
Output
IL = 350 µA
Voltage
to GND.
Swing
Vcm = 0V
IL = 350 µA
3.6
3.4
V+−1.9V
3.6
3.4
V+−1.9V
V
(Min)
0.7
0.8
1.0
0.7
0.8
1.0
to V+
V
(Max)
Vcm = 0V
Iout
Output
Vo = 3V
Source
Source
Vin (diff) = 1V
Iout
Output
Vo = 1.5V
Sink
Sink
Vin (diff) = 1V
Iout
Output
Vo = 1.5V
Sink
Sink
Vcm = 0V
Isource
Output
10
7
4
10
7
4
mA
(Min)
Current
5
4
3
5
4
3
mA
(Min)
Current
4
2
1
4
2
1
mA
(Min)
Current
Vin (diff) = 1V
20
Short to GND
Isink
Output
25
35
20
35
Vin (diff) = 1V
15
30
45
15
Short to V+
Vos
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25
35
35
30
mA
(Max)
45
mA
(Max)
10
10
2
µV/C˚
Electrical Characteristics (Note 6)
(Continued)
LP2902 (Note 9)
Symbol
Parameter
Conditions
Typ
LP324
Tested
Design
Limit
Limit
(Note 7)
(Note 8)
Typ
Tested
Design
Units
Limit
Limit
Limits
(Note 7)
(Note 8)
Drift
Ios
10
10
pA/C˚
100
100
KHz
50
50
V/mS
Drift
GBW
Gain
Bandwidth
Product
Sr
Slew Rate
Note 1: “Absolute Maximum Ratings” indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is
functional, but do not guarantee specific performance limits.
Note 2: The input voltage is not allowed to go more than −0.3V below V− (GND) as this will turn on a parasitic transistor causing large currents to flow through the
device.
Note 3: 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+. At values of supply voltage in excess of 15 VDC, 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 4: For operation at elevated temperatures, these devices must be derated based on a thermal resistance of θja and Tj max. Tj = TA + θjaPD.
Note 5: The LP2902 may be operated from −40˚C ≤ TA ≤ +85˚C, and the LP324 may be operated from 0˚C ≤ TA ≤ +70˚C.
Note 6: Boldface numbers apply at temperature extremes. All other numbers apply only at TA = Tj = 25˚C, V+ = 5V, Vcm = V/2, and RL = 100k connected to GND
unless otherwise specified.
Note 7: Guaranteed and 100% production tested.
Note 8: Guaranteed (but not 100% production tested) over the operating supply voltage range (3.0V to 32V for the LP324, LP324, and 3.0V to 26V for the LP2902),
and the common mode range (0V to V+ −1.5V), unless otherwise specified. These limits are not used to calculate outgoing quality levels.
Note 9: The LP2902 operating supply range is 3V to 26V, and is not tested above 26V.
Note 10: The test circuit used consists of the human body model of 100 pF in series with 1500Ω.
Typical Performance Curves
Input Voltage Range
Input Current
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Voltage Gain
Supply Current
DS008562-22
Open Loop
Frequency Response
DS008562-23
Power Supply
Rejection Ratio
DS008562-24
DS008562-25
3
DS008562-26
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Typical Performance Curves
Voltage Follower
Pulse Response
(Continued)
Voltage Follower Pulse
Response (Small Signal)
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Large Signal
Frequency Response
DS008562-28
Output Characteristics
Current Sourcing
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Common Mode
Rejection Ratio
DS008562-29
Output Characteristics
Current Sinking
DS008562-32
Current Limiting
DS008562-33
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 resulting
forward diode within the IC could destroy the unit.
Application Hints
The LP324 series is a micro-power pin-for-pin equivalent to
the LM324 op amps. Power supply current, input bias current, and input offset current have all been reduced by a factor of 10 over the LM324. Like its predecessor, the LP324 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 VDC.
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).
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Large differential input voltages can be easily accommodated and, as input differential voltage protection diodes are
not needed, no large input currents result from large differential input voltages. The differential input voltage may be
larger than V+ without damaging the device. Protection
should be provided to prevent the input voltages from going
negative more than −0.3 VDC (at 25˚C). An input clamp diode
with a resistor to the IC input terminal can be used.
4
Application Hints
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. Exceeding 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 returning the input within
the common mode range puts the input stage and thus the
amplifier in a normal operating mode.
(Continued)
The amplifiers have a class B output stage which allows the
amplifiers to both source and sink output currents. In applications where crossover distortion is undesirable, a resistor
should be used from the output of the amplifier to ground.
The resistor biases the output into class A operation.
The LP324 has improved stability margin for driving capacitive 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 LM324 is being replaced by an
LP324. Such situations usually occur when the LM324 has
been operated near its power bandwidth.
Output short circuits either to ground or to the positive power
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 excessive junction temperatures. For example: If all four amplifiers
were simultaneously shorted to ground on a 10V supply the
junction temperature would rise by 110˚C.
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, introducing a pseudo-ground (a bias voltage reference to V+/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
Comparator with Hysteresis
DS008562-3
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Non-Inverting Amplifier
Adder/Subtractor
DS008562-4
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Unity Gain Buffer
Positive Integrator
DS008562-5
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5
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Application Hints
(Continued)
Howland Current Pump
Differential Integrator
DS008562-9
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Bridge Current Amplifier
µ Power Current Source
DS008562-12
DS008562-11
Lowpass Filter
DS008562-13
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6
Application Hints
(Continued)
1 kHz Bandpass Active Filter
DS008562-14
Band-Reject Filter
DS008562-15
Pulse Generator
DS008562-16
7
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Application Hints
(Continued)
Window Comparator
DS008562-17
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Physical Dimensions
inches (millimeters) unless otherwise noted
S.O. Package (M)
Order Number LP324M or LP2902M
NS Package Number M14A
Dual-in-Line Package (N)
Order Number LP324N or LP2902N
NS Package Number N14A
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LP2902/LP324 Micropower Quad Operational Amplifier
Notes
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