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

DS007786-1

* 1 pF in the LM149

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

at 25˚C) and

), (Note 2)

— — 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

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

= 25˚C 4 25 4 50 4 50 nA

= 25˚C 30 100 30 200 30 200 nA

= 25˚C 0.8 2.5 0.8 2.5 0.8 2.5 MΩ

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

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

=±10V, RL≥ 2kΩ

OUT

= 25˚C, f = 1 Hz to 20 kHz

Test Circuit

= 25˚C

LM149 Series 4.0 4.0 4.0 MHz

= 1) 60 60 60 degrees

= 25˚C

LM149 Series (A

= 25˚C

LM149 Series (A

= 25˚C 25 25 25 mA

≤ 10 kΩ 6.0 7.5 7.5 mV

= 5) 60 60 60 degrees

= 1) 0.5 0.5 0.5 V/µs

= 5) 2.0 2.0 2.0 V/µs

www.national.com 2

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

2kΩ

=±15V, RL=10kΩ

=2kΩ

=±15V

≤ 10 kΩ 70 90 70 90 70 90 dB

=±10V, 25 15 15 V/mV

OUT

±12± ±10± ±

13 12

±12± ±10± ±

13 12

±12±

13 V

±10±

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

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

, 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.

jMAX−TA

, whichever is less.

dMAX

jMAX

Cross Talk Test Circuit

LM148/LM149/LM248/LM348

DS007786-6

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.

DS007786-7

DS007786-43

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.

www.national.com3

Typical Performance Characteristics

Supply Current

LM148/LM149/LM248/LM348

DS007786-23

Positive Current Limit

Input Bias Current

Negative Current Limit

DS007786-24

Voltage Swing

DS007786-25

Output Impedance

Common-Mode Rejection Ratio

DS007786-26

DS007786-29

Open Loop Frequency Response

DS007786-27

DS007786-30

DS007786-28

Bode Plot LM148

DS007786-31

www.national.com 4

Typical Performance Characteristics (Continued)

LM148/LM149/LM248/LM348

Bode Plot LM149

Small Signal Pulse Response (LM148)

DS007786-32

Large Signal Pulse Response (LM148)

Small Signal Pulse Response (LM149)

DS007786-33

Large Signal Pulse Response (LM149)

DS007786-34

Undistorted Output Voltage Swing

Gain Bandwidth

DS007786-35

DS007786-38

Slew Rate

DS007786-36

DS007786-39

DS007786-37

Inverting Large Signal Pulse Response (LM149)

DS007786-40

www.national.com5

Typical Performance Characteristics (Continued)

Inverting Large Signal Pulse Response (LM148)

LM148/LM149/LM248/LM348

DS007786-41

Negative Common-Mode Input Voltage Limit

Input Noise Voltage and Noise Current

DS007786-42

Positive Common-Mode Input Voltage Limit

DS007786-43

DS007786-5

Application Hints

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.

www.national.com 6

+ 12 hidden pages