LM348N/NOPB - National Semiconductor

LM148,LM248,LM348

LM148/LM248/LM348 Quad 741 Op Amps

Literature Number: SNOSBT2D

LM148/LM248/LM348

Quad 741 Op Amps

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 the supply current of a

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 ther-

mal coupling.

The LM148 can be used 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.

Features

n741 op amp operating characteristics

nClass AB output stage — no crossover distortion

nPin compatible with the LM124

nOverload protection for inputs and outputs

nLow supply current drain: 0.6 mA/Amplifier

nLow input offset voltage: 1 mV

nLow input offset current: 4 nA

nLow input bias current 30 nA

nHigh degree of isolation between amplifiers: 120 dB

nGain bandwidth product

nLM148 (unity gain): 1.0 MHz

Schematic Diagram

00778601

* 1 pF in the LM149

November 2003

LM148/LM248/LM348 Series Quad 741 Op Amp

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 LM248 LM348

Supply Voltage ±22V ±18V ±18V

Differential Input Voltage ±44V ±36V ±36V

Output Short Circuit Duration (Note 1) Continuous Continuous Continuous

Power Dissipation (P

at 25˚C) and

Thermal Resistance (θ

), (Note 2)

Molded DIP (N) P

— — 750 mW

— — 100˚C/W

Cavity DIP (J) P

1100 mW 800 mW 700 mW

110˚C/W 110˚C/W 110˚C/W

Maximum Junction Temperature (T

jMAX

) 150˚C 110˚C 100˚C

Operating Temperature Range −55˚C ≤T

≤+125˚C −25˚C ≤T

≤+85˚C 0˚C ≤T

≤+70˚C

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

Electrical Characteristics

(Note 3)

Parameter Conditions LM148 LM248 LM348 Units

Min Typ Max Min Typ Max Min Typ Max

Input Offset Voltage T

= 25˚C, R

≤10 kΩ1.0 5.0 1.0 6.0 1.0 6.0 mV

Input Offset Current T

= 25˚C 4 25 4 50 4 50 nA

Input Bias Current T

= 25˚C 30 100 30 200 30 200 nA

Input Resistance T

= 25˚C 0.8 2.5 0.8 2.5 0.8 2.5 MΩ

Supply Current All Amplifiers T

= 25˚C, V

=±15V 2.4 3.6 2.4 4.5 2.4 4.5 mA

Large Signal Voltage Gain T

= 25˚C, V

=±15V 50 160 25 160 25 160 V/mV

OUT

=±10V, R

≥2kΩ

Amplifier to Amplifier T

= 25˚C,f=1Hzto20kHz

Coupling (Input Referred) See Crosstalk −120 −120 −120 dB

Test Circuit

Small Signal Bandwidth T

= 25˚C,

LM148 Series

1.0 1.0 1.0 MHz

Phase Margin T

= 25˚C,

LM148 Series (A

=1)

60 60 60 degrees

Slew Rate T

= 25˚C,

LM148 Series (A

=1)

0.5 0.5 0.5 V/µs

Output Short Circuit Current T

= 25˚C 25 25 25 mA

Input Offset Voltage R

≤10 kΩ6.0 7.5 7.5 mV

Input Offset Current 75 125 100 nA

LM148/LM248/LM348

www.national.com 2

Electrical Characteristics (Continued)

(Note 3)

Parameter Conditions LM148 LM248 LM348 Units

Min Typ Max Min Typ Max Min Typ Max

Input Bias Current 325 500 400 nA

Large Signal Voltage Gain V

=±15V, V

OUT

=±10V, 25 15 15 V/mV

>2kΩ

Output Voltage Swing V

=±15V, R

=10kΩ±12 ±13 ±12 ±13 ±12 ±13 V

=2kΩ±10 ±12 ±10 ±12 ±10 ±12 V

Input Voltage Range V

=±15V ±12 ±12 ±12 V

Common-Mode Rejection R

≤10 kΩ70 90 70 90 70 90 dB

Ratio

Supply Voltage Rejection R

≤10 kΩ,±5V ≤V

≤±15V 77 96 77 96 77 96 dB

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 TJMAX,θJA, and the ambient temperature,

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

JMAX −T

A)/θJA or the 25˚C PDMAX, whichever is less.

Note 3: These specifications apply for VS=±15V and over the absolute maximum operating temperature range (TL≤TA≤TH) unless otherwise noted.

Note 4: Refer to RETS 148X for LM148 military specifications.

Note 5: Human body model, 1.5 kΩin series with 100 pF.

Cross Talk Test Circuit V

=±15V

00778606 00778607

00778643

LM148/LM248/LM348

www.national.com3

Typical Performance Characteristics

Supply Current Input Bias Current

00778623 00778624

Voltage Swing Positive Current Limit

00778625 00778626

Negative Current Limit Output Impedance

00778627

00778628

LM148/LM248/LM348

www.national.com 4

Typical Performance Characteristics (Continued)

Common-Mode Rejection Ratio Open Loop Frequency Response

00778629 00778630

Bode Plot LM148 Large Signal Pulse Response (LM148)

00778631 00778633

Small Signal Pulse Response (LM148) Undistorted Output Voltage Swing

00778635 00778637

LM148/LM248/LM348

www.national.com5

Typical Performance Characteristics (Continued)

Gain Bandwidth Slew Rate

00778638 00778639

Inverting Large Signal Pulse Response (LM148) Input Noise Voltage and Noise Current

00778641 00778642

Positive Common-Mode Input Voltage Limit Negative Common-Mode Input Voltage Limit

00778643

00778605

LM148/LM248/LM348

www.national.com 6

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 characteris-

tics 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 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 cor-

rect. 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 maxi-

mum 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.

As with most amplifiers, care should be taken lead dress,

component placement and supply decoupling in order to

ensure stability. For example, resistors from the output to an

input should be placed with the body close to the input to

minimize “pickup” and maximize the frequency of the feed-

back pole which capacitance from the input to ground cre-

ates.

A feedback pole is created when the feedback around any

amplifier is resistive. The parallel resistance and capacitance

from the input of the device (usually the inverting input) to AC

ground set the frequency of the pole. In many instances the

frequency of this pole is much greater than the expected 3

dB frequency of the closed loop gain and consequently there

is negligible effect on stability margin. However, if the feed-

back pole is less than approximately six times the expected

3 dB frequency a lead capacitor should be placed from the

output to the input of the op amp. The value of the added

capacitor should be such that the RC time constant of this

capacitor and the resistance it parallels is greater than or

equal to the original feedback pole time constant.

Typical Applications—LM148

One Decade Low Distortion Sinewave Generator

00778608

fMAX = 5 kHz, THD ≤0.03%

R1 = 100k pot. C1 = 0.0047 µF, C2 = 0.01 µF, C3 = 0.1 µF, R2 = R6 = R7 = 1M,

R3 = 5.1k, R4 = 12Ω,R5=240Ω, Q = NS5102, D1 = 1N914, D2 = 3.6V avalanche

diode (ex. LM103), VS=±15V

A simpler version with some distortion degradation at high frequencies can be made by using A1 as a simple inverting amplifier, and by putting back to back

zeners in the feedback loop of A3.

LM148/LM248/LM348

www.national.com7

Typical Applications—LM148 (Continued)

Low Cost Instrumentation Amplifier

00778609

VS=±15V

R = R2, trim R2 to boost CMRR

Low Drift Peak Detector with Bias Current Compensation

00778610

Adjust R for minimum drift

D3 low leakage diode

D1 added to improve speed

VS=±15V

LM148/LM248/LM348

www.national.com 8

Typical Applications—LM148 (Continued)

Universal State-Variable Filter

00778611

Tune Q through R0,

For predictable results: fOQ≤4x10

Use Band Pass output to tune for Q

LM148/LM248/LM348

www.national.com9

Typical Applications—LM148 (Continued)

A 1 kHz 4 Pole Butterworth

00778612

Use general equations, and tune each section separately

Q1stSECTION = 0.541, Q2ndSECTION = 1.306

The response should have 0 dB peaking

A 3 Amplifier Bi-Quad Notch Filter

00778613

Ex: fNOTCH = 3 kHz, Q = 5, R1 = 270k, R2 = R3 = 20k, R4 = 27k, R5 = 20k, R6 = R8 = 10k, R7 = 100k, C1 = C2 = 0.001 µF

Better noise performance than the state-space approach.

LM148/LM248/LM348

www.national.com 10

Typical Applications—LM148 (Continued)

A 4th Order 1 kHz Elliptic Filter (4 Poles, 4 Zeros)

00778614

R1C1 = R2C2 = t

R'1C'1 = R'2C'2 = t'

fC= 1 kHz, fS= 2 kHz, fp= 0.543, fZ= 2.14, Q = 0.841, f' P= 0.987, f' Z= 4.92, Q' = 4.403, normalized to ripple BW

Use the BP outputs to tune Q, Q', tune the 2 sections separately

R1 = R2 = 92.6k, R3 = R4 = R5 = 100k, R6 = 10k, R0 = 107.8k, RL= 100k, RH= 155.1k,

R'1 = R'2 = 50.9k, R'4 = R'5 = 100k, R'6 = 10k, R'0 = 5.78k, R'L= 100k, R'H= 248.12k, R'f = 100k. All capacitors are 0.001 µF.

Lowpass Response

00778615

LM148/LM248/LM348

www.national.com11

Typical Simulation

LM148, LM741 Macromodel for Computer Simulation

00778621

For more details, see IEEE Journal of Solid-State Circuits, Vol. SC-9, No. 6, December 1974

Note 6: o1 = 112IS=8x10

−16

Note 7: o2 = 144*C2=6pFforLM149

00778622

LM148/LM248/LM348

www.national.com 12

Connection Diagram

00778602

Top View

Order Number LM148J, LM148J/883, LM248J, LM348M, or LM348N

See NS Package Number J14A, M14A or N14A

LM148J is available per JM38510/11001

LM148/LM248/LM348

www.national.com13

Physical Dimensions inches (millimeters)

unless otherwise noted

Ceramic Dual-In-Line Package (J)

Order Number LM148J, LM148J/883, LM248J

NS Package Number J14A

S.O. Package (M)

Order Number LM348M or LM348MX

NS Package Number M14A

LM148/LM248/LM348

www.national.com 14

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

Molded Dual-In-Line Package (N)

Order Number LM348N

NS Package Number N14A

LIFE SUPPORT POLICY

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:

1. Life support devices or systems are devices or

systems which, (a) are intended for surgical implant

into the body, or (b) support or sustain life, and

whose failure to perform when properly used in

accordance with instructions for use provided in the

labeling, can be reasonably expected to result in a

significant injury to the user.

2. A critical component is any component of a life

support device or system whose failure to perform

can be reasonably expected to cause the failure of

the life support device or system, or to affect its

safety or effectiveness.

BANNED SUBSTANCE COMPLIANCE

National Semiconductor certifies that the products and packing materials meet the provisions of the Customer Products

Stewardship Specification (CSP-9-111C2) and the Banned Substances and Materials of Interest Specification

(CSP-9-111S2) and contain no ‘‘Banned Substances’’ as defined in CSP-9-111S2.

National Semiconductor

Americas Customer

Support Center

Email: new.feedback@nsc.com

Tel: 1-800-272-9959

National Semiconductor

Europe Customer Support Center

Fax: +49 (0) 180-530 85 86

Email: europe.support@nsc.com

Deutsch Tel: +49 (0) 69 9508 6208

English Tel: +44 (0) 870 24 0 2171

Français Tel: +33 (0) 1 41 91 8790

National Semiconductor

Asia Pacific Customer

Support Center

Email: ap.support@nsc.com

National Semiconductor

Japan Customer Support Center

Fax: 81-3-5639-7507

Email: jpn.feedback@nsc.com

Tel: 81-3-5639-7560

www.national.com

LM148/LM248/LM348 Series Quad 741 Op Amp

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.

IMPORTANT NOTICE

Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications, enhancements, improvements,

and other changes to its products and services at any time and to discontinue any product or service without notice. Customers should

obtain the latest relevant information before placing orders and should verify that such information is current and complete. All products are

sold subject to TI’s terms and conditions of sale supplied at the time of order acknowledgment.

TI warrants performance of its hardware products to the specifications applicable at the time of sale in accordance with TI’s standard

warranty. Testing and other quality control techniques are used to the extent TI deems necessary to support this warranty. Except where

mandated by government requirements, testing of all parameters of each product is not necessarily performed.

TI assumes no liability for applications assistance or customer product design. Customers are responsible for their products and

applications using TI components. To minimize the risks associated with customer products and applications, customers should provide

adequate design and operating safeguards.

TI does not warrant or represent that any license, either express or implied, is granted under any TI patent right, copyright, mask work right,

or other TI intellectual property right relating to any combination, machine, or process in which TI products or services are used. Information

published by TI regarding third-party products or services does not constitute a license from TI to use such products or services or a

warranty or endorsement thereof. Use of such information may require a license from a third party under the patents or other intellectual

property of the third party, or a license from TI under the patents or other intellectual property of TI.

Reproduction of TI information in TI data books or data sheets is permissible only if reproduction is without alteration and is accompanied

by all associated warranties, conditions, limitations, and notices. Reproduction of this information with alteration is an unfair and deceptive

business practice. TI is not responsible or liable for such altered documentation. Information of third parties may be subject to additional

restrictions.

Resale of TI products or services with statements different from or beyond the parameters stated by TI for that product or service voids all

express and any implied warranties for the associated TI product or service and is an unfair and deceptive business practice. TI is not

responsible or liable for any such statements.

TI products are not authorized for use in safety-critical applications (such as life support) where a failure of the TI product would reasonably

be expected to cause severe personal injury or death, unless officers of the parties have executed an agreement specifically governing

such use. Buyers represent that they have all necessary expertise in the safety and regulatory ramifications of their applications, and

acknowledge and agree that they are solely responsible for all legal, regulatory and safety-related requirements concerning their products

and any use of TI products in such safety-critical applications, notwithstanding any applications-related information or support that may be

provided by TI. Further, Buyers must fully indemnify TI and its representatives against any damages arising out of the use of TI products in

such safety-critical applications.

TI products are neither designed nor intended for use in military/aerospace applications or environments unless the TI products are

specifically designated by TI as military-grade or "enhanced plastic."Only products designated by TI as military-grade meet military

specifications. Buyers acknowledge and agree that any such use of TI products which TI has not designated as military-grade is solely at

the Buyer's risk, and that they are solely responsible for compliance with all legal and regulatory requirements in connection with such use.

TI products are neither designed nor intended for use in automotive applications or environments unless the specific TI products are

designated by TI as compliant with ISO/TS 16949 requirements. Buyers acknowledge and agree that, if they use any non-designated

products in automotive applications, TI will not be responsible for any failure to meet such requirements.

Following are URLs where you can obtain information on other Texas Instruments products and application solutions:

Products Applications

Audio www.ti.com/audio Communications and Telecom www.ti.com/communications

Amplifiers amplifier.ti.com Computers and Peripherals www.ti.com/computers

Data Converters dataconverter.ti.com Consumer Electronics www.ti.com/consumer-apps

DLP®Products www.dlp.com Energy and Lighting www.ti.com/energy

DSP dsp.ti.com Industrial www.ti.com/industrial

Clocks and Timers www.ti.com/clocks Medical www.ti.com/medical

Interface interface.ti.com Security www.ti.com/security

Logic logic.ti.com Space, Avionics and Defense www.ti.com/space-avionics-defense

Power Mgmt power.ti.com Transportation and Automotive www.ti.com/automotive

Microcontrollers microcontroller.ti.com Video and Imaging www.ti.com/video

RFID www.ti-rfid.com

OMAP Mobile Processors www.ti.com/omap

Wireless Connectivity www.ti.com/wirelessconnectivity

TI E2E Community Home Page e2e.ti.com

Mailing Address: Texas Instruments, Post Office Box 655303, Dallas, Texas 75265