Datasheet LP2902 Datasheet (National Semiconductor)

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LP2902/LP324
Micropower Quad Operational Amplifier

LP2902/LP324 Micropower Quad Operational Amplifier

September 1999

General Description

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 goodinputspecifications,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.

Features

n Low supply current: 125 µA (max)
n Low offset voltage: 2 mV (max)
n Low input bias current: 4 nA (max)
n Input common mode to GND
n Interfaces to CMOS logic
n Wide supply range: 3V
n Small Outline Package available
n Pin-for-pin compatible with LM324

+

<

V

Connection Diagram Simplified Schematic

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

<

32V

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© 1999 National Semiconductor Corporation DS008562 www.national.com

Absolute Maximum Ratings (Note 1)

If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.

Supply Voltage 32V or

LP2902 26V or

Differential Input Voltage 32V

LP2902 26V

Input Voltage (Note 2) −0.3V to 32V

LP2902 −0.3V to 26V

Output Short-Circuit to GND Continuous

(One Amplifier) (Note 3)

+

≤ 15V and T

V

ESD Susceptibility (Note 10)

=

25˚C

A

±
±

±

16V
13V

500V

Operating Conditions

Package

Power Dissipation 500 mW 500 mW

(Note 4)

Max 150˚C 150˚C

T

j

θ

ja

Operating Temp. Range (Note 5) (Note 5)
Storage Temp. Range −65˚C ≤ T ≤ 150˚C
Soldering

Information (10 sec.) 300˚C 260˚C
Vapor Phase (60 sec.) 215˚C
Infrared (15 sec.) 220˚C

NM

90˚C/W 140˚C/W

Electrical Characteristics (Note 6)

Symbol Parameter Conditions Tested Design Tested Design Units

V

os

I

b

I

os

A

vol

CMRR Common V

PSRR Power V

I

s

V

o

I

out

Source Source V

I

out

Sink Sink V

I

out

Sink Sink V

I

source

I

sink

V

os

Input Offset 2 4 10 24 9mV
Voltage (Max)
Input Bias 2 20 40 210 20 nA
Current (Max)
Input Offset 0.5 4 8 0.2 2 4 nA
Current (Max)
Voltage R
Gain to GND (Min)

Mode Rej. 0V ≤ V
Ratio V

Supply Rej. (Min)
Ratio
Supply R
Current (Max)
Output I
Voltage to GND. (Min)
Swing V

Output V

Current
Output V

Current
Output V

Current
Output Vin(diff)=1V 20 25 35 20 25 35 mA
Short to GND 35 35 (Max)
Output Vin(diff)=1V 15 30 45 15 30 45 mA

+

Short to V

=

10k 70 40 30 100 50 40 V/mV

L

+

=

30V

V

+

=

30V 90 80 75 90 80 75 dB

cm

<

V+− 1.5

cm
+

=

5V to 30V 90 80 75 90 80 75 dB

=

∞

L

=

350 µA 3.6 3.4 V

L

=

0V

cm

=

350 µA 0.7 0.8 1.0 0.7 0.8 1.0 V

I

L

+

to V

=

0V

V

cm

=

3V 10 7 4 10 7 4 mA

o

(diff)=1V (Min)

in

=

1.5V 5 4 3 54 3mA

o

(diff)=1V (Min)

in

=

1.5V 4 2 1 42 1mA

o

=

0V (Min)

cm

LP2902 (Note 9) LP324

Typ Limit Limit Typ Limit Limit Limits

(Note 7) (Note 8) (Note 7) (Note 8)

(Min)

85 150 250 85 150 250 µA

+

−1.9V 3.6 3.4 V+−1.9V V

(Max)

10 10 µV/C˚

(Max)

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Electrical Characteristics (Note 6) (Continued)

Symbol Parameter Conditions Tested Design Tested Design Units

Drift
I

os

Drift
GBW Gain

Bandwidth 100 100 KHz
Product

S

r

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
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
ticularly 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 θ
Note 5: The LP2902 may be operated from −40˚C ≤ T
Note 6: Boldface numbers apply at temperature extremes. All other numbers apply only at T

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

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.

Slew Rate 50 50 V/mS

+

. At values of supply voltage in excess of 15 VDC, continuous short-circuit to GND can exceed the power dissipation ratings (par-

≤ +85˚C, and the LP324 may be operated from 0˚C ≤ TA≤ +70˚C.

A

+

−1.5V), unless otherwise specified. These limits are not used to calculate outgoing quality levels.

LP2902 (Note 9) LP324

Typ Limit Limit Typ Limit Limit Limits

(Note 7) (Note 8) (Note 7) (Note 8)

10 10 pA/C˚

−

(GND) as this will turn on a parasitic transistor causing large currents to flow through the

=

V/2, and R

=

+ θjaPD.

T

j

A

=

100k connected to GND

L

and Tjmax. T

ja

=

A

+

=

25˚C, V

=

5V,V

cm

T

j

Typical Performance Curves

Input Voltage Range

Voltage Gain

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Input Current

Open Loop

Frequency Response

DS008562-22

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Supply Current

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Power Supply

Rejection Ratio

DS008562-26

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Typical Performance Curves (Continued)

Voltage Follower

Pulse Response

Large Signal

Frequency Response

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Voltage Follower Pulse

Response (Small Signal)

DS008562-28

Output Characteristics

Current Sourcing

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Current Limiting

Common Mode
Rejection Ratio

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Output Characteristics

Current Sinking

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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 V

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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.

DC

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.

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 V
with a resistor to the IC input terminal can be used.

(at 25˚C). An input clamp diode

DC

Application Hints (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.

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.

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

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Non-Inverting Amplifier

Unity Gain Buffer

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Comparator with Hysteresis

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Adder/Subtractor

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Positive Integrator

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Application Hints (Continued)

Differential Integrator

Bridge Current Amplifier

Howland Current Pump

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µ Power Current Source

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Lowpass Filter

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DS008562-13

Application Hints (Continued)

1 kHz Bandpass Active Filter

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Band-Reject Filter

Pulse Generator

DS008562-15

DS008562-16

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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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Notes

LP2902/LP324 Micropower Quad Operational Amplifier

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NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT
DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL
COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein:

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National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications.

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