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/s 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 s.
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 -25C to +85C tem-
perature range. The LM318 is specified from 0C to +70C.
Features
n
15 MHz small signal bandwidth
n
Guaranteed 50V/s 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
5 k
)
August 2000
LM1
18/LM218/LM318
Operational
Amplifiers
2000 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
-55C to +125C
LM218
-25C to +85C
LM318
0C to +70C
Storage Temperature Range
-65C to +150C
Lead Temperature (Soldering, 10 sec.)
Hermetic Package
300C
Plastic Package
260C
Soldering Information
Dual-In-Line Package
Soldering (10 sec.)
260C
Small Outline Package
Vapor Phase (60 sec.)
215C
Infrared (15 sec.)
220C
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
= 25C
2
4
4
10
mV
Input Offset Current
T
A
= 25C
6
50
30
200
nA
Input Bias Current
T
A
= 25C
120
250
150
500
nA
Input Resistance
T
A
= 25C
1
3
0.5
3
M
Supply Current
T
A
= 25C
5
8
5
10
mA
Large Signal Voltage Gain
T
A
= 25C, V
S
=
15V
50
200
25
200
V/mV
V
OUT
=
10V, R
L
2 k
Slew Rate
T
A
= 25C, V
S
=
15V, A
V
= 1
50
70
50
70
V/s
(Note 6)
Small Signal Bandwidth
T
A
= 25C, V
S
=
15V
15
15
MHz
Input Offset Voltage
6
15
mV
Input Offset Current
100
300
nA
Input Bias Current
500
750
nA
Supply Current
T
A
= 125C
4.5
7
mA
Large Signal Voltage Gain
V
S
=
15V, V
OUT
=
10V
25
20
V/mV
R
L
2 k
Output Voltage Swing
V
S
=
15V, R
L
= 2 k
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 150C, the LM218 is 110C, and the LM318 is 110C. For operating at elevated temperatures, devices
in the H08 package must be derated based on a thermal resistance of 160C/W, junction to ambient, or 20C/W, junction to case. The thermal resistance of the
dual-in-line package is 100C/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
20V and -55C
T
A
+125C (LM118), -25C
T
A
+85C (LM218), and 0C
T
A
+70C (LM318). Also,
power supplies must be bypassed with 0.1 F 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/s.
Note 7: Refer to RETS118X for LM118H and LM118J military specifications.
Note 8: Human body model, 1.5 k
in series with 100 pF.
LM1
18/LM218/LM318
www.national.com
2
Typical Performance Characteristics
LM118, LM218 (Continued)
Typical Performance Characteristics
LM318
Large Signal Frequency
Response
DS007766-37
Open Loop Frequency
Response
DS007766-38
Voltage Follower Pulse
Response
DS007766-39
Large Signal Frequency
Response
DS007766-40
Open Loop Frequency
Response
DS007766-41
Inverter Pulse Response
DS007766-42
Input Current
DS007766-43
Voltage Gain
DS007766-44
Power Supply Rejection
DS007766-45
LM1
18/LM218/LM318
www.national.com
4
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