LM349N - National Semiconductor - Datasheet.Technology

TL/H/7786

LM148/LM149 Series Quad 741 Op Amp

February 1995

LM148/LM149 Series Quad 741 Op Amp

LM148/LM248/LM348 Quad 741 Op Amps

LM149/LM349 Wide Band Decompensated (AV (MIN) e5)

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 off-

set 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 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 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.

Features

Y741 op amp operating characteristics

YLow supply current drain 0.6 mA/Amplifier

YClass AB output stageÐno crossover distortion

YPin compatible with the LM124

YLow input offset voltage 1 mV

YLow input offset current 4 nA

YLow input bias current 30 nA

YGain bandwidth product

LM148 (unity gain) 1.0 MHz

LM149 (AVt5) 4 MHz

YHigh degree of isolation between amplifiers 120 dB

YOverload protection for inputs and outputs

Schematic Diagram

TL/H/7786–1

*1 pF in the LM149

C1995 National Semiconductor Corporation RRD-B30M115/Printed in U. S. A.

Absolute Maximum Ratings

If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/

Distributors for availability and specifications.

(Note 4)

LM148/LM149 LM248 LM348/LM349

Supply Voltage g22V g18V g18V

Differential Input Voltage g44V g36V g36V

Output Short Circuit Duration (Note 1) Continuous Continuous Continuous

Power Dissipation (Pdat 25§C) and

Thermal Resistance (ijA), (Note 2)

Molded DIP (N) PdÐ Ð 750 mW

ijA Ð Ð 100§C/W

Cavity DIP (J) Pd1100 mW 800 mW 700 mW

iJA 110§C/W 110§C/W 110§C/W

Maximum Junction Temperature (TjMAX) 150§C 110§C 100§C

Operating Temperature Range b55§CsTAsa125§Cb25§CsTAsa85§C0

70§C

Storage Temperature Range b65§Ctoa

150§Cb65§Ctoa

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/LM149 LM248 LM348/LM349 Units

Min Typ Max Min Typ Max Min Typ Max

Input Offset Voltage TAe25§C, RSs10 kX1.0 5.0 1.0 6.0 1.0 6.0 mV

Input Offset Current TAe25§C 4 25 4 50 4 50 nA

Input Bias Current TAe25§C 30 100 30 200 30 200 nA

Input Resistance TAe25§C 0.8 2.5 0.8 2.5 0.8 2.5 MX

Supply Current All Amplifiers TAe25§C, VSeg15V 2.4 3.6 2.4 4.5 2.4 4.5 mA

Large Signal Voltage Gain TAe25§C, VSeg15V 50 160 25 160 25 160 V/mV

VOUT eg10V, RLt2kX

Amplifier to Amplifier TAe25§C, f e1Hzto20kHz

Coupling (Input Referred) See Crosstalk b120 b120 b120 dB

Test Circuit

Small Signal Bandwidth LM148 Series 1.0 1.0 1.0 MHz

TAe25§C

LM149 Series 4.0 4.0 4.0 MHz

Phase Margin LM148 Series (AVe1) 60 60 60 degrees

TAe25§C

LM149 Series (AVe5) 60 60 60 degrees

Slew Rate LM148 Series (AVe1) 0.5 0.5 0.5 V/ms

TAe25§C

LM149 Series (AVe5) 2.0 2.0 2.0 V/ms

Output Short Circuit Current TAe25§C252525mA

Input Offset Voltage RSs10 kX6.0 7.5 7.5 mV

Input Offset Current 75 125 100 nA

Input Bias Current 325 500 400 nA

Electrical Characteristics (Note 3) (Continued)

Parameter Conditions LM148/LM149 LM248 LM348/LM349 Units

Min Typ Max Min Typ Max Min Typ Max

Large Signal Voltage Gain VSeg15V, VOUT eg10V, 25 15 15 V/mV

RLl2kX

Output Voltage Swing VSeg15V, RLe10 kXg12 g13 g12 g13 g12 g13 V

RLe2kXg

10 g12 g10 g12 g10 g12 V

Input Voltage Range VSeg15V g12 g12 g12 V

Common-Mode Rejection RSs10 kX70 90 70 90 70 90 dB

Ratio

Supply Voltage Rejection RSs10 kX,g5V sVSsg15V 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,ijA, and the ambient temperature,

TA. The maximum available power dissipation at any temperature is Pde(TjMAX bTA)/ijA or the 25§CP

dMAX, whichever is less.

Note 3: These specifications apply for VSeg15V and over the absolute maximum operating temperature range (TLsTAsTH) unless otherwise noted.

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 kXin series with 100 pF.

Cross Talk Test Circuit

TL/H/7786–6 TL/H/7786–7

Crosstalk eb

20 log eÊOUT

101 ceOUT

(dB)

VSeg15V

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 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 am-

plifier 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 differen-

tial 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 volt-

age 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 feed-

back connection) and the capacitance to reduce the phase

shift resulting from the capacitive loading.

The output current of each amplifier in the package is limit-

ed. 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 capaci-

tance from the input of the device (usually the inverting in-

put) 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 feedback 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 Performance Characteristics

Supply Current Input Bias Current Voltage Swing

Positive Current Limit Negative Current Limit Output Impedance

Ratio

Common-Mode Rejection

Response

Open Loop Frequency

Bode Plot LM148

Bode Plot LM149 Response (LM148)

Large Signal Pulse

Response (LM149)

Large Signal Pulse

TL/H/7786–3

Typical Performance Characteristics (Continued)

Response (LM148)

Small Signal Pulse

Response (LM149)

Small Signal Pulse

Voltage Swing

Undistorted Output

Gain Bandwidth Slew Rate Response (LM149)

Inverting Large Signal Pulse

Response (LM148)

Inverting Large Signal Pulse

Noise Current

Input Noise Voltage and

Input Voltage Limit

Positive Common-Mode

TL/H/7786–4

Voltage Limit

Negative Common-Mode Input

TL/H/7786–5

Typical ApplicationsÐLM148

One Decade Low Distortion Sinewave Generator

fe1

2qR1C1 c0K, K eR4R5

R3 #1

rDS

R4 a1

R5 J,r

DS &RON

#1bVGS

VPJ(/2

TL/H/7786–8

fMAX e5 kHz, THD s0.03%

R1 e100k pot. C1 e0.0047 mF, C2 e0.01 mF, C3 e0.1 mF, R2 eR6 eR7 e1M,

R3 e5.1k, R4 e12X,R5e240X,QeNS5102, D1 e1N914, D2 e3.6V avalanche

diode (ex. LM103), VSeg15V

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.

Low Cost Instrumentation Amplifier

TL/H/7786–9

VOUT e2#2R

R1 a1J,V

Sb3V sVIN CM sVSab3V,

VSeg15V

ReR2, trim R2 to boost CMRR

Typical ApplicationsÐLM148 (Continued)

Low Drift Peak Detector with Bias Current Compensation

Adjust R for minimum drift

D3 low leakage diode

D1 added to improve speed

VSeg15V

TL/H/7786–10

Universal State-Variable Filter

Tune Q through R0,

For predictable results: fOQs4c104

Use Band Pass output to tune for Q

TL/H/7786–11

V(s)

VIN(s)

eN(s)

D(s)

, D(s) eS2aS0o

Qa0o2

NHP(s) eS2HOHP,N

BP(s) ebs0OHOBP

QNLP e0o2HOLP.

foe1

2q0R6

R5 01

t1t2 ,t

ieR

i,Q

e#1

R3 aR4

1aR6

R5 J#R6

t2J(/2

fNOTCH e1

2q#RH

RLt1t2J(/2

OHP e1aR6

1aR3

R0 aR3

R4 ,H

OBP e1aR4

R3 aR4

1aR3

R0 aR3

HOLP e1aR5

1aR3

R0 aR3

Typical ApplicationsÐLM148 (Continued)

A 1 kHz 4 Pole Butterworth

TL/H/7786–12

Use general equations, and tune each section separately

Q1stSECTION e0.541, Q2ndSECTION e1.306

The response should have 0 dB peaking

A 3 Amplifier Bi-Quad Notch Filter

TL/H/7786–13

Qe0R8

R7 cR1C1

0R3C2R2C1 ,f

R7 c1

0R2R3C1C2 ,f

NOTCH e1

2q0R6

R3R5R7C1C2

Necessary condition for notch: 1

R6 eR1

R4R7

Ex: fNOTCH e3 kHz, Q e5, R1 e270k, R2 eR3 e20k, R4 e27k, R5 e20k, R6 eR8 e10k, R7 e100k, C1 eC2 e0.001 mF

Better noise performance than the state-space approach.

Typical ApplicationsÐLM148 (Continued)

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

R1C1 eR2C2 et

RÊ1CÊ1eRÊ2CÊ2etÊ

TL/H/7786–14

fCe1 kHz, fSe2 kHz, fpe0.543, fZe2.14, Q e0.841, fÊPe0.987, fÊZe4.92, QÊe4.403, normalized to ripple BW

fPe1

2q0R6

R5 c1

t,f

e#1

R3 aR4

1aR6

R5 Jc0R6

R5 ,Q

1aRÊ4

RÊ0

1aRÊ6

RÊ5aRÊ6

RPeRHRL

RHaRL

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

R1 eR2 e92.6k, R3 eR4 eR5 e100k, R6 e10k, R0 e107.8k, RLe100k, RHe155.1k,

RÊ1eRÊ2e50.9k, RÊ4eRÊ5e100k, RÊ6e10k, RÊ0e5.78k, RÊLe100k, RÊHe248.12k, RÊfe100k. All capacitors are 0.001 mF.

Lowpass Response

TL/H/7786–15

Typical ApplicationsÐLM149

Minimum Gain to Insure LM149 Stability

TL/H/7786–16

ACL(S) eVOUT

VIN

eb4

#1a5

AOL(s) Jjb4

VOÀVIN e0

jg5V

Power BW e40 kHz

Small Signal BW eG BW/5

The LM149 as a Unity Gain Inverter

TL/H/7786–17

ACL(s) eVOUT

VIN

e#b1

1a6

AOL(s) Jjb1

VOÀVIN e0

jg5V

Small Signal BW eG BW/5

Non-inverting-Integrator Bandpass Filter

TL/H/7786–18

For stability purposes: R7 eR6/4, 10R6 eR5, CCe10C

fOe1

2q0R5

R6 c1

RC ,Q

R6 ,Ho

BP eRQ

RIN

fO(MAX),Q

MAX e20 kHz, 10

Better Q sensitivity with respect to open loop gain variations than the state variable filter.

R7, CCadded for compensation

Typical ApplicationsÐLM149 (Continued)

Active Tone Control with Full Output Swing (No Slew Limiting at 20 kHz)

TL/H/7786–19

VSeg15V, VOUT(MAX) e9.1 VRMS,fHe1

2qR5C3 ,f

HB e1

2q(R1 a2R7) C3

fMAX e20 kHz, THD s1%

Max Bass Gain j(R1 aR2)/R1

Duplicate the above circuit for stereo

Max Treble Gain j(R1 a2R7)/R5

fLe1

2qR2C1 ,f

LB e1

2qR1C1 as shown: fLj32 Hz, fLB j320 Hz

fHj11 kHz, fHB j1.1 Hz

Triangular Squarewave Generator

TL/H/7786–20

feKcVIN

8VaC1R1 ,K

R2/RÊ2, 2VI

s25V, VaeVb,V

15V

Use LM125 for g15V supply

The circuit can be used as a low frequency V/F for process control.

Q1, Q3: KE4393, Q2, Q4: P1087E, D1–D4 e1N914

Typical Simulation

LM148, LM149, LM741 Macromodel for Computer Simulation

TL/H/7786–22

TL/H/7786–21

bo1 e112 ISe8c10b16

bo2 e144 *C2 e6 pF for LM149

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

Connection Diagram

Dual-In-Line Package

TL/H/7786–2

Top View

Order Number LM148J, LM148J/883, LM149J, LM149J/883, LM248J, LM348J, LM348M, LM348N or LM349N

See NS Package Number J14A, M14A or N14A

LM148J is available per JM38510/11001

Physical Dimensions inches (millimeters)

Ceramic Dual-In-Line Package (J)

Order Number LM148J, LM148J/883, LM149J, LM149J/883, LM248J or LM348J

NS Package Number J14A

LM148/LM149 Series Quad 741 Op Amp

Physical Dimensions inches (millimeters) (Continued)

S.O. Package (M)

Order Number LM348M

NS Package Number M14A

Molded Dual-In-Line Package (N)

Order Number LM348N or LM349N

NS Package Number N14A

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failure to perform, when properly used in accordance support device or system, or to affect its safety or

with instructions for use provided in the labeling, can effectiveness.

be reasonably expected to result in a significant injury

to the user.

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