LP324NNOPB - NATIONAL SEMICONDUCTOR

LP2902,LP324

LP324/LP2902 Micropower Quad Operational Amplifier

Literature Number: SNOSBX6B

LP324/LP2902

Micropower Quad Operational Amplifier

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 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 ap-

plications.

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

nLow supply current: 85µA (typ)

nLow offset voltage: 2mV (typ)

nLow input bias current: 2nA (typ)

nInput common mode to GND

nInterfaces to CMOS logic

nWide supply range: 3V <V

<32V

nSmall Outline Package available

nPin-for-pin compatible with LM324

Connection Diagrams

Dual-In-Line (N) and SO (M) 14-Pin TSSOP

00856201

Order Number LP324M or LP2902M

See NS Package Number M14A

Order Number LP324N or LP2902N

See NS Package Number N14A

00856240

Order Number LP324MT and LP324MTX

See NS Package Number MTC14

Simplified Schematic

00856202

July 2001

LP324/LP2902 Micropower Quad Operational Amplifier

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

LP324 32V or ±16V

LP2902 26V or ±13V

Differential Input Voltage

LP324 32V

LP2902 26V

Input Voltage (Note 2)

LP324 −0.3V to 32V

LP2902 −0.3V to 26V

Output Short-Circuit to GND Continuous

(One Amplifier) (Note 3)

≤15V and T

= 25˚C

ESD Susceptibility (Note 10) ±500V

Operating Conditions

JMAX

150˚C

(Note 4)

MT Package 154˚C/W

N Package 90˚C/W

M Package 140˚C/W

Operating Temp. Range (Note 5)

Storage Temp. Range −65˚C≤T

≤150˚C

Soldering Information

Wave Soldering(10sec) 260˚C(lead temp.)

Convection or Infrared(20sec) 235˚C

Electrical Characteristics (Note 6)

LP2902 (Note 9) LP324

Symbol Parameter Conditions Tested Design Tested Design Units

Typ Limit Limit Typ Limit Limit Limits

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

Input Offset

Voltage 2410 249mV

(Max)

Input Bias Current 2 20 40 21020 nA

(Max)

Input Offset Current 0.5 4 80.2 2 4nA

(Max)

VOL

Voltage Gain R

= 10k to GND

= 30V 70 40 30 100 50 40 V/mV

(Min)

CMRR Common Mode Rej.

Ratio V

= 30V, 0V ≤V

− 1.5 90 80 75 90 80 75 dB

(Min)

PSRR Power Supply Rej.

Ratio V

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

(Min)

Supply Current R

=∞85 150 250 85 150 250 µA

(Max)

Output Voltage

Swing I

= 350µA to GND

=0V 3.6 3.4 V

−1.9V 3.6 3.4 V

−1.9V V

(Min)

= 350µA to V

=0V 0.7 0.8 1.0 0.7 0.8 1.0 V

(Max)

OUT

Source Output Source

Current V

=3V

(diff) = 1V 10 7 410 7 4mA

(Min)

OUT

Sink Output Sink Current V

= 1.5V

(diff) = 1V 543543mA

(Min)

OUT

Sink Output Sink Current V

= 1.5V

=0V 421421mA

(Min)

SOURCE

Output Short to GND V

(diff) = 1V 20 25

35 35 20 25

35 35 mA

(Max)

SINK

Output Short to V

(diff) = 1V 15 30 45 15 30 45 mA

(Max)

Drift 10 10 µV/C˚

Drift 10 10 pA/C˚

LP324/LP2902

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Electrical Characteristics (Note 6) (Continued)

LP2902 (Note 9) LP324

Symbol Parameter Conditions Tested Design Tested Design Units

Typ Limit Limit Typ Limit Limit Limits

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

GBW Gain Bandwidth

Product 100 100 KHz

SR Slew Rate 50 50 V/mS

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 TJmax. TJ=T

A+θ

JAPD.

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=T

J= 25˚C, V+=5V,V

cm = 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.

LP324/LP2902

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Typical Performance Curves

Input Voltage Range Input Current

00856221 00856222

Supply Current Voltage Gain

00856223 00856224

Open Loop

Frequency Response Power Supply

Rejection Ratio

00856225 00856226

LP324/LP2902

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Typical Performance Curves (Continued)

Voltage Follower

Pulse Response Voltage Follower Pulse

Response (Small Signal)

00856227 00856228

Common Mode

Rejection Ratio Large Signal

Frequency Response

00856229 00856230

Output Characteristics

Current Sourcing Output Characteristics

Current Sinking

00856231 00856232

LP324/LP2902

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Typical Performance Curves

(Continued)

Current Limiting

00856233

Application Hints

The LP324 series is a micro-power pin-for-pin equivalent to

the LM324 op amps. Power supply current, input bias cur-

rent, 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).

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 accommo-

dated 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

without damaging the device. Protection

should be provided to prevent the input voltages from going

negative more than −0.3 V

(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

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 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 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 de-

stroyed, 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 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, introduc-

ing 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

00856203

LP324/LP2902

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Application Hints (Continued)

Comparator with Hysteresis

00856206

Non-Inverting Amplifier

00856204

Adder/Subtractor

00856207

Unity Gain Buffer

00856205

Positive Integrator

00856208

Differential Integrator

00856209

Howland Current Pump

00856210

Bridge Current Amplifier

00856211

µ Power Current Source

00856212

LP324/LP2902

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Application Hints (Continued)

Lowpass Filter

00856213

1 kHz Bandpass Active Filter

00856214

Band-Reject Filter

00856215

LP324/LP2902

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Application Hints (Continued)

Pulse Generator

00856216

Window Comparator

00856217

LP324/LP2902

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Physical Dimensions inches (millimeters)

unless otherwise noted

S.O. Package (M)

Order Number LP324M, LP324MX, LP2902M or LP2902MX

NS Package Number M14A

Dual-in-Line Package (N)

Order Number LP324N or LP2902N

NS Package Number N14A

LP324/LP2902

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Physical Dimensions inches (millimeters) unless otherwise noted (Continued)

14-Pin TSSOP

Order Number LP324MT and LP324MTX

NS Package Number MTC14

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www.national.com

LP324/LP2902 Micropower Quad Operational Amplifier

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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