Datasheet LP324MTX, LP324MT Datasheet (NSC)

LP324/LP2902
Micropower Quad Operational Amplifier

LP324/LP2902 Micropower Quad Operational Amplifier

July 2001

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 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.

Connection Diagrams

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

Features

n Low supply current: 85µA (typ)
n Low offset voltage: 2mV (typ)
n Low input bias current: 2nA (typ)
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

32V

Order Number LP324M or LP2902M

See NS Package Number M14A

Order Number LP324N or LP2902N

See NS Package Number N14A

Simplified Schematic

00856201

00856240

Order Number LP324MT and LP324MTX

See NS Package Number MTC14

00856202

© 2001 National Semiconductor Corporation DS008562 www.national.com

+

Absolute Maximum Ratings (Note 1)

If Military/Aerospace specified devices are required,

V

≤ 15V and TA= 25˚C

ESD Susceptibility (Note 10)

please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.

LP324/LP2902

Supply Voltage

LP324 32V or
LP2902 26V or

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)

±

16V

±

13V

Operating Conditions

T

JMAX

θ

(Note 4)

JA

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
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)

V

OS

I

B

I

OS

A

VOL

CMRR Common Mode Rej.

PSRR Power Supply Rej.

I

S

V

O

I

OUT

Source
I

OUT

Sink
I

OUT

Sink
I

SOURCE

I

SINK

V

OS

Drift
I

OS

Drift

Input Offset

2410 249mV

Voltage
Input Bias Current 2 20 40 21020 nA

Input Offset Current 0.5 4 8 0.2 2 4 nA

Voltage Gain RL= 10k to GND

+

= 30V

V

+

V

= 30V, 0V ≤ V

Ratio

<

V

V+− 1.5

CM
+

V

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

CM

70 40 30 100 50 40 V/mV

90 80 75 90 80 75 dB

Ratio
Supply Current RL=

Output Voltage
Swing

∞

IL= 350µA to GND

=0V

V

CM

I

= 350µA to V

L

+

85 150 250 85 150 250 µA

3.6 3.4 V

+

−1.9V 3.6 3.4 V+−1.9V V

0.7 0.8 1.0 0.7 0.8 1.0 V

VCM=0V

Output Source
Current

Output Sink Current V

Output Sink Current V

Output Short to GND VIN(diff) = 1V 20 25

Output Short to V

V

=3V

O

(diff) = 1V

V

IN

= 1.5V

O

(diff) = 1V

V

IN

= 1.5V

O

V

CM

=0V

10 7 4 10 7 4 mA

543543mA

421421mA

35 20 25

+

35

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

35

35 mA

10 10 µV/C˚

10 10 pA/C˚

±

500V

150˚C

≤ 150˚C

J

(Max)

(Max)

(Max)

(Min)

(Min)

(Min)

(Max)

(Min)

(Max)

(Min)

(Min)

(Min)

(Max)

(Max)

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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

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
device.

Note 3: Short circuits from the output to GNDcan cause excessive heatingand eventual destruction.The maximum sourcing output current is approximately30 mA
independent of the magnitude of V
(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 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 theoperating supply voltage range(3.0V to 32V forthe 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.

+

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

≤ +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.

100 100 KHz

−

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

and TJmax. TJ=TA+θJAPD.

JA

= 25˚C, V+=5V,Vcm= V/2, and RL=100k connected to GND

A=TJ

LP324/LP2902

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Typical Performance Curves

Input Voltage Range Input Current

LP324/LP2902

Supply Current Voltage Gain

00856221 00856222

Open Loop

Frequency Response

00856223

00856224

Power Supply

Rejection Ratio

00856225 00856226

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Typical Performance Curves (Continued)

LP324/LP2902

Voltage Follower

Pulse Response

Common Mode
Rejection Ratio

00856227

Voltage Follower Pulse

Response (Small Signal)

00856228

Large Signal

Frequency Response

Output Characteristics

Current Sourcing

00856229

00856231

00856230

Output Characteristics

Current Sinking

00856232

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Typical Performance Curves

(Continued)

Current Limiting

LP324/LP2902

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 linearmode 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 outputshave 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 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

(at 25˚C).Aninputclamp diode

DC

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 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

.

DC

00856233

metal fusing, but rather due to the large increase in IC chip
dissipation which will cause eventual failure due to exces­sive junction temperatures. Forexample: 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 inputswill 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

00856203

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LP324/LP2902

Application Hints (Continued)

Comparator with Hysteresis

Non-Inverting Amplifier

Adder/Subtractor

Differential Integrator

00856206

00856209

Howland Current Pump

00856204

00856210

Unity Gain Buffer

Positive Integrator

Bridge Current Amplifier

00856207

00856205

00856211

µ Power Current Source

00856208

00856212

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Application Hints (Continued)

LP324/LP2902

Lowpass Filter

00856213

1 kHz Bandpass Active Filter

Band-Reject Filter

00856214

00856215

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Application Hints (Continued)

LP324/LP2902

Pulse Generator

00856216

Window Comparator

00856217

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Physical Dimensions inches (millimeters)

unless otherwise noted

LP324/LP2902

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

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

LP324/LP2902 Micropower Quad Operational Amplifier

14-Pin TSSOP

Order Number LP324MT and LP324MTX

NS Package Number MTC14

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can be reasonably expected to cause the failure of
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