LM318.pdf

August 2000

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 compen-

sation. This considerably simplifies its application since no

external components are necessary for operation. However,

unlike most internally compensated amplifiers, external fre-

quency compensation may be added for optimum perfor-

mance. For inverting applications, feedforward compensa-

tion will boost the slew rate to over 150V/µs and almost

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 re-

duce the 0.1% settling time to under 1 µs.

The high speed and fast settling time of these op amps make

them useful in A/D converters, oscillators, active filters,

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 −25˚C to +85˚C tem-

perature range. The LM318 is specified from 0˚C to +70˚C.

Features

n 15 MHz small signal bandwidth

n Guaranteed 50V/µs slew rate

n Maximum bias current of 250 nA

n Operates from supplies of ± 5V to ± 20V

n Internal frequency compensation

n Input and output overload protected

n Pin compatible with general purpose op amps

Fast Voltage Follower

(Note 1)

DS007766-13

Note 1: Do not hard-wire as voltage follower (R1

)

DS007766

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Absolute Maximum Ratings (Note 7)

If Military/Aerospace specified devices are required,

please contact the National Semiconductor Sales Office/

Distributors for availability and specifications.

Supply Voltage

Lead Temperature (Soldering, 10 sec.)

Hermetic Package

300˚C

Plastic Package

260˚C

± 20V

Soldering Information

Dual-In-Line Package

Soldering (10 sec.)

260˚C

Power Dissipation (Note 2)

500 mW

Differential Input Current (Note 3)

± 10 mA

Small Outline Package

Vapor Phase (60 sec.) 215˚C

Infrared (15 sec.) 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 8)

Input Voltage (Note 4)

± 15V

Output Short-Circuit Duration

Continuous

Operating Temperature Range

LM118

−55˚C to +125˚C

LM218

−25˚C to +85˚C

2000V

LM318

0˚C to +70˚C

Storage Temperature Range

−65˚C to +150˚C

Electrical Characteristics (Note 5)

Parameter

Conditions

LM118/LM218

LM318

Units

Min

Typ Max

Min

Typ Max

Input Offset Voltage

T A = 25˚C

Input Offset Current

T A = 25˚C

200

Input Bias Current

T A = 25˚C

120

250

150

500

Input Resistance

T A = 25˚C

0.5

Supply Current

T A = 25˚C

Large Signal Voltage Gain

T A = 25˚C, V S = ± 15V

200

V/mV

V OUT = ± 10V, R L

³ 2k W

Slew Rate

T A = 25˚C, V S = ± 15V, A V = 1

V/µs

(Note 6)

Small Signal Bandwidth

T A = 25˚C, V S = ± 15V

MHz

Input Offset Voltage

Input Offset Current

100

300

Input Bias Current

500

750

Supply Current

T A = 125˚C

4.5

Large Signal Voltage Gain

V S = ± 15V, V OUT = ± 10V

V/mV

R L

± 12 ± 13 ± 12 ± 13 V

Input Voltage Range V S = ± 15V ± 11.5 ± 11.5 V

Common-Mode Rejection Ratio 80 100 70 100 dB

Supply Voltage Rejection Ratio 70 80 65 80 dB

Note 2: The maximum junction temperature of the LM118 is 150˚C, the LM218 is 110˚C, and the LM318 is 110˚C. For operating at elevated temperatures, devices

in the H08 package must be derated based on a thermal resistance of 160˚C/W, junction to ambient, or 20˚C/W, junction to case. The thermal resistance of the

dual-in-line package is 100˚C/W, junction to ambient.

Note 3: The inputs are shunted with back-to-back diodes for overvoltage protection. Therefore, excessive current will flow if a differential input voltage in excess of

1V is applied between the inputs unless some limiting resistance is used.

Note 4: For supply voltages less than ± 15V, the absolute maximum input voltage is equal to the supply voltage.

Note 5: These specifications apply for ± 5V £ V S

V S = ± 15V, R L =2k W

± 20V and −55˚C £ T A

+125˚C (LM118), −25˚C

T A

+85˚C (LM218), and 0˚C

T A

+70˚C (LM318). Also,

power supplies must be bypassed with 0.1 µF disc capacitors.

Note 6: Slew rate is tested with V S = ± 15V. The LM118 is in a unity-gain non-inverting configuration. V IN is stepped from −7.5V to +7.5V and vice versa. The slew

rates between −5.0V and +5.0V and vice versa are tested and guaranteed to exceed 50V/µs.

Note 7: Refer to RETS118X for LM118H and LM118J military specifications.

Note 8: Human body model, 1.5 k

in series with 100 pF.

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Output Voltage Swing

Typical Performance Characteristics LM118, LM218

Input Current

Voltage Gain

Power Supply Rejection

DS007766-25

DS007766-26

DS007766-27

Input Noise Voltage

Common Mode Rejection

Supply Current

DS007766-28

DS007766-29

DS007766-30

Closed Loop Output

Impedance

Current Limiting

Input Current

DS007766-32

DS007766-33

DS007766-31

Unity Gain Bandwidth

Voltage Follower Slew Rate

Inverter Settling Time

DS007766-34

DS007766-35

DS007766-36

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Typical Performance Characteristics LM118, LM218 (Continued)

Large Signal Frequency

Response

Open Loop Frequency

Response

Voltage Follower Pulse

Response

DS007766-37

DS007766-38

DS007766-39

Large Signal Frequency

Response

Open Loop Frequency

Response

Inverter Pulse Response

DS007766-42

DS007766-40

DS007766-41

Typical Performance Characteristics LM318

Input Current

Voltage Gain

Power Supply Rejection

DS007766-43

DS007766-44

DS007766-45

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Typical Performance Characteristics LM318 (Continued)

Input Noise Voltage

Common Mode Rejection

Supply Current

DS007766-46

DS007766-47

DS007766-48

Closed Loop Output Impedance

Current Limiting

Input Current

DS007766-49

DS007766-50

DS007766-51

Unity Gain Bandwidth

Voltage Follower Slew Rate

Inverter Settling Time

DS007766-52

DS007766-53

DS007766-54

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