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TL/H/7766

LM118/LM218/LM318 Operational Amplifiers

November 1994

LM118/LM218/LM318

Operational Amplifiers

General Description

The LM118 series are precision high speed operational am-

plifiers designed for applications requiring wide bandwidth

and high slew rate. They feature a factor of ten increase in

speed over general purpose devices without sacrificing DC

performance.

The LM118 series has internal unity gain frequency com-

pensation. This considerably simplifies its application since

no external components are necessary for operation. How-

ever, unlike most internally compensated amplifiers, exter-

nal frequency compensation may be added for optimum

performance. For inverting applications, feedforward com-

pensation will boost the slew rate to over 150V/ms and al-

most double the bandwidth. Overcompensation can be

used with the amplifier for greater stability when maximum

bandwidth is not needed. Further, a single capacitor can be

added to reduce the 0.1% settling time to under 1 ms.

The high speed and fast settling time of these op amps

make them useful in A/D converters, oscillators, active fil-

ters, sample and hold circuits, or general purpose amplifiers.

These devices are easy to apply and offer an order of mag-

nitude better AC performance than industry standards such

as the LM709.

The LM218 is identical to the LM118 except that the LM218

has its performance specified over a

Cto

C tem-

perature range. The LM318 is specified from 0

Cto

Features

15 MHz small signal bandwidth

Guaranteed 50V/ms slew rate

Maximum bias current of 250 nA

Operates from supplies of

5V to

20V

Internal frequency compensation

Input and output overload protected

Pin compatible with general purpose op amps

Connection Diagrams

Dual-In-Line Package

TL/H/7766– 24

Top View

Order Number LM118J/883*

See NS Package Number J14A

Dual-In-Line Package

TL/H/7766– 3

Top View

Order Number LM118J-8/883*,

LM318M or LM318N

See NS Package Number J08A, M08A or N08B

Metal Can Package**

TL/H/7766– 2

Top View

**Pin connections shown on schematic diagram

and typical applications are for TO-5 package.

Order Number LM118H, LM118H/883*,

LM218H or LM318H

See NS Package Number H08C

*Available per JM38510/10107.

1995 National Semiconductor Corporation RRD-B30M115/Printed in U. S. A.

Summary of content (14 pages)

PAGE 1
LM118/LM218/LM318 Operational Amplifiers General Description The LM118 series are precision high speed operational amplifiers designed for applications requiring wide bandwidth and high slew rate. They feature a factor of ten increase in speed over general purpose devices without sacrificing DC performance. The LM118 series has internal unity gain frequency compensation. This considerably simplifies its application since no external components are necessary for operation.
PAGE 2
Absolute Maximum Ratings Operating Temperature Range LM118 LM218 LM318 If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/Distributors for availability and specifications. (Note 6) g 20V Supply Voltage Power Dissipation (Note 1) Differential Input Current (Note 2) Input Voltage (Note 3) Output Short-Circuit Duration b 55§ C to a 125§ C b 25§ C to a 85§ C 0§ C to a 70§ C Storage Temperature Range Lead Temperature (Soldering, 10 sec.
PAGE 3
Typical Performance Characteristics LM118, LM218 Input Current Voltage Gain Power Supply Rejection Input Noise Voltage Common Mode Rejection Supply Current Closed Loop Output Impedance Current Limiting Input Current Unity Gain Bandwidth Voltage Follower Slew Rate Inverter Settling Time TL/H/7766 – 4 3
PAGE 4
Typical Performance Characteristics LM118, LM218 (Continued) Large Signal Frequency Response Open Loop Frequency Response Voltage Follower Pulse Response Large Signal Frequency Response Open Loop Frequency Response Inverter Pulse Response TL/H/7766 – 5 Typical Performance Characteristics LM318 Input Current Voltage Gain Power Supply Rejection Input Noise Voltage Common Mode Rejection Supply Current TL/H/7766 – 6 4
PAGE 5
Typical Performance Characteristics LM318 (Continued) Closed Loop Output Impedance Current Limiting Input Current Unity Gain Bandwidth Voltage Follower Slew Rate Inverter Settling Time Large Signal Frequency Response Open Loop Frequency Response Voltage Follower Pulse Response Large Signal Frequency Response Open Loop Frequency Response Inverter Pulse Response TL/H/7766 – 7 5
PAGE 6
Auxiliary Circuits Feedforward Compensation for Greater Inverting Slew Rate ² Compensation for Minimum Settling ² Time ² Slew rate typically 150V/ms. *Balance circuit necessary for increased slew. ² Slew and settling time to 0.1% for a 10V step change is 800 ns.
PAGE 7
Typical Applications (Continued) Fast Summing Amplifier Differential Amplifier TL/H/7766 – 16 TL/H/7766 – 15 Fast Sample and Hold TL/H/7766 – 18 D/A Converter Using Ladder Network *OptionalÐReduces settling time.
PAGE 8
Four Quadrant Multiplier DOutput zero. *‘‘Y’’ zero a ‘‘X’’ zero ³ Full scale adjust.
PAGE 9
Typical Applications (Continued) D/A Converter Using Binary Weighted Network Fast Summing Amplifier with Low Input Current *OptionalÐReduces settling time. TL/H/7766 – 20 TL/H/7766 – 21 Wein Bridge Sine Wave Oscillator Instrumentation Amplifier *L1Ð10VÐ14 mA bulb ELDEMA 1869 R1 e R2 C1 e C2 TL/H/7766 – 22 1 fe 2qR2 C1 *Gain t 200K for 1.
PAGE 10
TL/H/7766 – 1 Schematic Diagram 10
PAGE 11
PAGE 12
Physical Dimensions inches (millimeters) Metal Can Package (H) Order Number LM118H, LM118H/883, LM218H or LM318H NS Package Number H08C Ceramic Dual-In-Line Package (J) Order Number LM118J-8/883 NS Package Number J08A 12
PAGE 13
Physical Dimensions inches (millimeters) (Continued) Ceramic Dual-In-Line Package (J) Order Number LM118J/883 NS Package Number J14A S.O.
PAGE 14
LM118/LM218/LM318 Operational Amplifiers Physical Dimensions inches (millimeters) (Continued) Molded Dual-In-Line Package (N) Order Number LM318N NS Package Number N08E 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 OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein: 1.