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
reduce 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
magnitude 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
n15 MHz small signal bandwidth
nGuaranteed 50V/µs slew rate
nMaximum bias current of 250 nA
nOperates from supplies of ±5V to ±20V
nInternal frequency compensation
nInput and output overload protected
nPin compatible with general purpose op amps
Fast Voltage Follower
(Note 1)
00776613
Note 1: Do not hard-wire as voltage follower (R1 ≥5kΩ)
August 2000
LM118/LM218/LM318 Operational Amplifiers
© 2004 National Semiconductor Corporation DS007766 www.national.com
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 ±20V
Power Dissipation (Note 2) 500 mW
Differential Input Current (Note 3) ±10 mA
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
LM318 0˚C to +70˚C
Storage Temperature Range −65˚C to +150˚C
Lead Temperature (Soldering, 10 sec.)
Hermetic Package 300˚C
Plastic Package 260˚C
Soldering Information
Dual-In-Line Package
Soldering (10 sec.) 260˚C
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) 2000V
Electrical Characteristics (Note 5)
Parameter Conditions LM118/LM218 LM318 Units
Min Typ Max Min Typ Max
Input Offset Voltage T
A
= 25˚C 2 4 4 10 mV
Input Offset Current T
A
= 25˚C 6 50 30 200 nA
Input Bias Current T
A
= 25˚C 120 250 150 500 nA
Input Resistance T
A
= 25˚C 1 3 0.5 3 MΩ
Supply Current T
A
= 25˚C 5 8 5 10 mA
Large Signal Voltage Gain T
A
= 25˚C, V
S
=±15V 50 200 25 200 V/mV
V
OUT
=±10V, R
L
≥2kΩ
Slew Rate T
A
= 25˚C, V
S
=±15V, A
V
= 1 50 70 50 70 V/µs
(Note 6)
Small Signal Bandwidth T
A
= 25˚C, V
S
=±15V 15 15 MHz
Input Offset Voltage 615mV
Input Offset Current 100 300 nA
Input Bias Current 500 750 nA
Supply Current T
A
= 125˚C 4.5 7 mA
Large Signal Voltage Gain V
S
=±15V, V
OUT
=±10V 25 20 V/mV
R
L
≥2kΩ
Output Voltage Swing V
S
=±15V, R
L
=2kΩ±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 ≤VS≤±20V and −55˚C ≤TA≤+125˚C (LM118), −25˚C ≤TA≤+85˚C (LM218), and 0˚C ≤TA≤+70˚C (LM318). Also,
power supplies must be bypassed with 0.1 µF disc capacitors.
Note 6: Slew rate is tested with VS=±15V. The LM118 is in a unity-gain non-inverting configuration. VIN 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 kΩin series with 100 pF.
LM118/LM218/LM318
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Typical Performance Characteristics
LM118, LM218
Input Current Voltage Gain
00776625 00776626
Power Supply Rejection Input Noise Voltage
00776627 00776628
Common Mode Rejection Supply Current
00776629 00776630
LM118/LM218/LM318
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Typical Performance Characteristics LM118, LM218 (Continued)
Closed Loop Output
Impedance Current Limiting
00776631 00776632
Input Current Unity Gain Bandwidth
00776633 00776634
Voltage Follower Slew Rate Inverter Settling Time
00776635 00776636
LM118/LM218/LM318
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Typical Performance Characteristics LM118, LM218 (Continued)
Large Signal Frequency
Response
Open Loop Frequency
Response
00776637 00776638
Voltage Follower Pulse
Response
Large Signal Frequency
Response
00776639 00776640
Open Loop Frequency
Response Inverter Pulse Response
00776641 00776642
LM118/LM218/LM318
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Typical Performance Characteristics
LM318
Input Current Voltage Gain
00776643 00776644
Power Supply Rejection Input Noise Voltage
00776645 00776646
Common Mode Rejection Supply Current
00776647 00776648
LM118/LM218/LM318
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Typical Performance Characteristics LM318 (Continued)
Closed Loop Output Impedance Current Limiting
00776649 00776650
Input Current Unity Gain Bandwidth
00776651 00776652
Voltage Follower Slew Rate Inverter Settling Time
00776653 00776654
LM118/LM218/LM318
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Typical Performance Characteristics LM318 (Continued)
Large Signal Frequency
Response
Open Loop Frequency
Response
00776655 00776656
Voltage Follower Pulse
Response
Large Signal Frequency
Response
00776657 00776658
Open Loop Frequency
Response Inverter Pulse Response
00776659 00776660
LM118/LM218/LM318
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Auxiliary Circuits
Feedforward Compensation
for Greater Inverting Slew Rate
(Note 9)
00776608
*Balance circuit necessary for increased slew.
Note 9: Slew rate typically 150V/µs.
Compensation for Minimum Settling Time
(Note 10)
00776609
Note 10: Slew and settling time to 0.1% for a 10V step change is 800 ns.
Offset Balancing
00776610
Isolating Large Capacitive Loads
00776611
Overcompensation
00776612
LM118/LM218/LM318
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Typical Applications
Fast Voltage Follower
(Note 11)
00776613
Integrator or Slow Inverter
00776614
CF= Large
(CF≥50 pF)
*Do not hard-wire as integrator or slow inverter; insert a 10k-5 pF network in series with the input, to prevent oscillation.
Note 11: Do not hard-wire as voltage follower (R1 ≥5kΩ)
Fast Summing Amplifier
00776615
Differential Amplifier
00776616
LM118/LM218/LM318
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Typical Applications (Continued)
Fast Sample and Hold
00776618
D/A Converter Using Ladder Network
00776619
*Optional — Reduces settling time.
LM118/LM218/LM318
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Typical Applications (Continued)
Four Quadrant Multiplier
00776617
∆Output zero.
*“Y” zero
+“X” zero
‡Full scale adjust.
D/A Converter Using Binary Weighted Network
00776620
*Optional — Reduces settling time.
LM118/LM218/LM318
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Typical Applications (Continued)
Fast Summing Amplifier with Low Input Current
00776621
Wein Bridge Sine Wave Oscillator
00776622
Instrumentation Amplifier
00776623
LM118/LM218/LM318
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Schematic Diagram
00776601
LM118/LM218/LM318
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Connection Diagram
Dual-In-Line Package
00776624
Top View
Order Number LM118J/883 (Note 13)
See NS Package Number J14A
Dual-In-Line Package
00776603
Top View
Order Number LM118J-8/883 (Note 13),
LM318M or LM318N
See NS Package Number J08A, M08A or N08B
Metal Can Package
(Note 12)
00776602
Top View
Order Number LM118H, LM118H/883 (Note 13),
LM218H or LM318H
See NS Package Number H08C
Note 12: Pin connections shown on schematic diagram and typical applica-
tions are for TO-5 package.
Note 13: Available per JM38510/10107.
LM118/LM218/LM318
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Physical Dimensions inches (millimeters)
unless otherwise noted
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
LM118/LM218/LM318
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Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
Ceramic Dual-In-Line Package (J)
Order Number LM118J/883
NS Package Number J14A
S.O. Package (M)
Order Number LM318M or LM318MX
NS Package Number M08A
LM118/LM218/LM318
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Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
Molded Dual-In-Line Package (N)
Order Number LM318N
NS Package Number N08E
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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.
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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.
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LM118/LM218/LM318 Operational Amplifiers
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.
