NSC LM348J Datasheet

LM148/LM248/LM348
Quad 741 Op Amps
LM149

LM148/LM149 Series Quad 741 Op Amp

December 2000

Wide Band Decompensated (A

General Description

The LM148 series is a true quad 741. It consists of four
independent, high gain, internally compensated, low power
operational amplifiers which have been designed to provide
functional characteristics identical to those of the familiar
741 operational amplifier. In addition the total supply current
for all four amplifiers is comparable to thesupplycurrentofa
single 741 type op amp. Other features include input offset
currents and input bias current which are much less than
those of a standard 741. Also, excellent isolation between
amplifiers has been achieved by independently biasing each
amplifier and using layout techniques which minimize
thermal coupling. The LM149 series has the same features
as the LM148 plus a gain bandwidth product of 4 MHz at a
gain of 5 or greater.

The LM148 canbeused anywhere multiple 741 or 1558 type
amplifiers are being used and in applications where amplifier
matching or high packing density is required. For lower
power refer to LF444.

Schematic Diagram

V (MIN)

=5)

Features

n 741 op amp operating characteristics
n Class AB output stage—no crossover distortion
n Pin compatible with the LM124
n Overload protection for inputs and outputs
n Low supply current drain: 0.6 mA/Amplifier
n Low input offset voltage: 1 mV
n Low input offset current: 4 nA
n Low input bias current 30 nA
n High degree of isolation between amplifiers: 120 dB
n Gain bandwidth product
n LM148 (unity gain): 1.0 MHz
n LM149 (A

≥ 5): 4 MHz

V

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* 1 pF in the LM149

© 2001 National Semiconductor Corporation DS007786 www.national.com

Absolute Maximum Ratings (Note 4)

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

LM148/LM149 LM248 LM348

Supply Voltage
Differential Input Voltage

±
±

22V

44V
Output Short Circuit Duration (Note 1) Continuous Continuous Continuous
Power Dissipation (P
Thermal Resistance (θ

LM148/LM149/LM248/LM348

Molded DIP (N) P

Cavity DIP (J) P

Maximum Junction Temperature (T
Operating Temperature Range −55˚C ≤ T

d

d

θ

jA

d

θ

JA

at 25˚C) and

), (Note 2)

jA

— — 750 mW

— — 100˚C/W

1100 mW 800 mW 700 mW

110˚C/W 110˚C/W 110˚C/W

) 150˚C 110˚C 100˚C

jMAX

≤ +125˚C −25˚C ≤ TA≤ +85˚C 0˚C ≤ TA≤ +70˚C

A

Storage Temperature Range −65˚C to +150˚C −65˚C to +150˚C −65˚C to +150˚C
Lead Temperature (Soldering, 10 sec.) Ceramic 300˚C 300˚C 300˚C
Lead Temperature (Soldering, 10 sec.) Plastic 260˚C
Soldering Information

Dual-In-Line Package

Soldering (10 seconds) 260˚C 260˚C 260˚C

Small Outline Package

Vapor Phase (60 seconds) 215˚C 215˚C 215˚C

Infrared (15 seconds) 220˚C 220˚C 220˚C
See AN-450 “Surface Mounting Methods and Their Effect on Product Reliability” for other methods of soldering surface mount
devices.

ESD tolerance (Note 5) 500V 500V 500V

±
±

18V
36V

±
±

18V
36V

Electrical Characteristics

(Note 3)

Parameter Conditions LM148/LM149 LM248 LM348 Units

Min Typ Max Min Typ Max Min Typ Max

Input Offset Voltage T
Input Offset Current T
Input Bias Current T
Input Resistance T
Supply Current All Amplifiers T
Large Signal Voltage Gain T

Amplifier to Amplifier T
Coupling (Input Referred) See Crosstalk −120 −120 −120 dB

Small Signal Bandwidth LM148 Series 1.0 1.0 1.0 MHz

Phase Margin LM148 Series (A

Slew Rate LM148 Series (A

Output Short Circuit Current T
Input Offset Voltage R
Input Offset Current 75 125 100 nA

= 25˚C, RS≤ 10 kΩ 1.0 5.0 1.0 6.0 1.0 6.0 mV

A

= 25˚C 4 25 4 50 4 50 nA

A

= 25˚C 30 100 30 200 30 200 nA

A

= 25˚C 0.8 2.5 0.8 2.5 0.8 2.5 MΩ

A

= 25˚C, VS=±15V 2.4 3.6 2.4 4.5 2.4 4.5 mA

A

= 25˚C, VS=±15V 50 160 25 160 25 160 V/mV

A

V

=±10V, RL≥ 2kΩ

OUT

= 25˚C, f = 1 Hz to 20 kHz

A

Test Circuit

T

= 25˚C

A

LM149 Series 4.0 4.0 4.0 MHz

= 1) 60 60 60 degrees

V

T

= 25˚C

A

LM149 Series (A

T

= 25˚C

A

LM149 Series (A

= 25˚C 25 25 25 mA

A

≤ 10 kΩ 6.0 7.5 7.5 mV

S

= 5) 60 60 60 degrees

V

= 1) 0.5 0.5 0.5 V/µs

V

= 5) 2.0 2.0 2.0 V/µs

V

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Electrical Characteristics (Continued)

(Note 3)

Parameter Conditions LM148/LM149 LM248 LM348 Units

Min Typ Max Min Typ Max Min Typ Max

Input Bias Current 325 500 400 nA
Large Signal Voltage Gain V

Output Voltage Swing V

Input Voltage Range V
Common-Mode Rejection R

=±15V, V

S

>

R

2kΩ

L

=±15V, RL=10kΩ

S

R

=2kΩ

L

=±15V

S

≤ 10 kΩ 70 90 70 90 70 90 dB

S

=±10V, 25 15 15 V/mV

OUT

±12±
±10±
±

12

13
12

±12±
±10±
±

12

13
12

±12±

13 V

±10±

12 V

±

12 V

Ratio
Supply Voltage Rejection R

Note 1: Any of the amplifier outputs can be shorted to ground indefinitely; however, more than one should not be simultaneously shorted as the maximum junction
temperature will be exceeded.

Note 2: The maximum power dissipation for these devices must be derated at elevated temperatures and is dicated by T

. The maximum available power dissipation at any temperature is Pd=(T

T

A

Note 3: These specifications apply for V
Note 4: Refer to RETS 148X for LM148 military specifications and refer to RETS 149X for LM149 military specifications.
Note 5: Human body model, 1.5 kΩ in series with 100 pF.

≤ 10 kΩ,±5V ≤ VS≤±15V 77 96 77 96 77 96 dB

S

, θjA, and the ambient temperature,

)/θjAor the 25˚C P

=±15V and over the absolute maximum operating temperature range (TL≤ TA≤ TH) unless otherwise noted.

S

jMAX−TA

, whichever is less.

dMAX

jMAX

Cross Talk Test Circuit

LM148/LM149/LM248/LM348

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VS=±15V

Application Hints

The LM148 series are quad low power 741 op amps. In the
proliferation of quad op amps, these are the first to offer the
convenience of familiar, easy to use operating
characteristics of the 741 op amp. In those applications
where 741 op amps have been employed, the LM148 series
op amps can be employed directly with no change in circuit
performance.

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The LM149 series has the same characteristics as the
LM148 except it has been decompensated to provide a
wider bandwidth. As a result the part requires a minimum
gain of 5.

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Typical Performance Characteristics

Supply Current

LM148/LM149/LM248/LM348

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Positive Current Limit

Input Bias Current

Negative Current Limit

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Voltage Swing

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Output Impedance

Common-Mode Rejection
Ratio

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Open Loop Frequency
Response

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Bode Plot LM148

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Typical Performance Characteristics (Continued)

LM148/LM149/LM248/LM348

Bode Plot LM149

Small Signal Pulse
Response (LM148)

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Large Signal Pulse
Response (LM148)

Small Signal Pulse
Response (LM149)

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Large Signal Pulse
Response (LM149)

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Undistorted Output
Voltage Swing

Gain Bandwidth

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Slew Rate

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Inverting Large Signal Pulse
Response (LM149)

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Typical Performance Characteristics (Continued)

Inverting Large Signal Pulse
Response (LM148)

LM148/LM149/LM248/LM348

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Negative Common-Mode Input
Voltage Limit

Input Noise Voltage and
Noise Current

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Positive Common-Mode
Input Voltage Limit

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Application Hints

The LM148 series are quad low power 741 op amps. In the
proliferation of quad op amps, these are the first to offer the
convenience of familiar, easy to use operating
characteristics of the 741 op amp. In those applications
where 741 op amps have been employed, the LM148 series
op amps can be employed directly with no change in circuit
performance.

The LM149 series has the same characteristics as the
LM148 except it has been decompensated to provide a
wider bandwidth. As a result the part requires a minimum
gain of 5.

The package pin-outs are such that the inverting input of
each amplifier is adjacent to its output. In addition, the
amplifier outputs are located in the corners of the package
which simplifies PC board layout and minimizes package
related capacitive coupling between amplifiers.

The input characteristics of these amplifiers allow differential
input voltages which can exceed the supply voltages. In
addition, if either of the input voltages is within the operating
common-mode range, the phase of the output remains
correct. If the negative limit of the operating common-mode
range is exceeded at both inputs, the output voltage will be
positive. For input voltages which greatly exceed the
maximum supply voltages, either differentially or
common-mode, resistors should be placed in series with the
inputs to limit the current.

Like the LM741, these amplifiers can easily drive a 100 pF
capacitive load throughout the entire dynamic output voltage
and current range. However, if very large capacitive loads
must be driven by a non-inverting unity gain amplifier, a
resistor should be placed between the output (and feedback
connection) and the capacitance to reduce the phase shift
resulting from the capacitive loading.

The output current of each amplifier in the package is limited.
Short circuits from an output to either ground or the power
supplies will not destroy the unit. However, if multiple output
shorts occur simultaneously, the time duration should be
short to prevent the unit from being destroyed as a result of
excessive power dissipation in the IC chip.

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