National Semiconductor LM102, LM302 Technical data
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LM102/LM302 Voltage Followers
General Description
The LM102 series are high-gain operational amplifiers designed specifically for unity-gain voltage follower applications. Built on a single silicon chip, the devices incorporate
advanced processing techniques to obtain very low input
current and high input impedance. Further, the input transistors are operated at zero collector-base voltage to virtually
eliminate high temperature leakage currents. It can therefore be operated in a temperature stabilized component
oven to get extremely low input currents and low offset voltage drift.
The LM102, which is designed to operate with supply voltages between
capacitance as well as excellent small signal and large signal frequency responseÐall of which minimize high fre-
Schematic Diagram
g
12V andg15V, also features low input
November 1994
quency gain error. Because of the low wiring capacitances
inherent in monolithic construction, this fast operation can
be realized without increasing power consumption.
Features
Y
Fast slewing Ð 10V/ms
Y
Low input current Ð 10 nA (max)
Y
High input resistance Ð 10,000 MX
Y
No external frequency compensation required
Y
Simple offset balancing with optional 1 kX
potentiometer
Y
Plug-in replacement for both the LM101 and LM709 in
voltage follower applications
LM102/LM302 Voltage Followers
TL/H/7753– 1
C
1995 National Semiconductor Corporation RRD-B30M115/Printed in U. S. A.
TL/H/7753
Absolute Maximum Ratings
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales
Office/Distributors for availability and specifications.
(Note 6)
Supply Voltage
g
18V
Power Dissipation (Note 1) 500 mW
Input Voltage (Note 2)
g
15V
Output Short Circuit Duration (Note 3) Indefinite
Operating Free Air Temperature Range
LM102
LM302 0
Storage Temperature Range
b
55§Ctoa125§C
Ctoa70§C
§
b
65§Ctoa150§C
Lead Temperature (Soldering, 10 sec.) 300§C
ESD rating to be determined.
Electrical Characteristics (Note 4)
Parameter Conditions
Input Offset Voltage T
Input Bias Current T
Input Resistance T
e
25§C 2 5 5 15 mV
A
e
25§C 3 10 10 30 nA
A
e
25§C10
A
Input Capacitance 3.0 3.0 pF
Large Signal Voltage T
Gain V
Output Resistance T
Supply Current T
A
OUT
A
A
e
e
e
g
25§C, V
e
g
10V, R
15V,
S
e
8kX
L
25§C 0.8 2.5 0.8 2.5 X
25§C 3.5 5.5 3.5 5.5 mA
Input Offset Voltage 7.5 20 mV
Offset Voltage
Temperature Drift
Input Bias Current T
Large Signal Voltage V
Gain R
Output Voltage V
Swing (Note 5)
Supply Current T
Supply Voltage
Rejection Ratio
Note 1: The maximum junction temperature of the LM102 is 150§C, while that of the LM302 is 85§C. For operating at elevated temperatures, devices in the H08
package must be derated based on a thermal resistance of 150
Note 2: For supply voltages less than
Note 3: It is necessary to insert a resistor (at least 5k and preferably 10k) in series with the input pin when the amplifier is driven from low impedance sources to
prevent damage when the output is shorted and to ensure stability.
Note 4: These specifications apply for
specified.
Note 5: Increased output swing under load can be obtained by connecting an external resistor between the booster and V
Note 6: Refer to RETS102X for the LM102H military specifications.
e
TAMAX 3 10 3.0 15 nA
A
e
T
TAMIN 30 100 20 50 nA
A
e
g
15V, V
S
e
10 kX
L
e
g
15V, R
S
e
125§C 2.6 4.0 mA
A
g
12VsV
g
15V, the absolute maximum input voltage is equal to the supply voltage.
g
12VsV
e
g
e
10 kX
g
15V
s
g
15V andb55§CsT
S
10V,
C/W, junction to ambient, or 20§C/W, junction to case.
§
OUT
L
s
S
APPLICATION HINT
The input must be driven from a source impedance of typically 10 kX (5 kX Min) to maintain stability. The total source
impedance will be reduced at high frequencies if there is stray capacitance at the input pin. In these cases, a 10 kX resistor
should be inserted in series with the input, physically close to the input pin to minimize the stray capacitance and prevent
oscillation.
LM102 LM302
Units
Min Typ Max Min Type Max
10
12
10
9
10
12
10
0.999 0.9996 0.9985 0.9995 1.0 V/V
620mV/
0.999
g
10
g
10 V
60 60 dB
s
125§C for the LM102 and 0§CsT
A
s
70§C for the LM302 unless otherwise
A
b
terminals. See curve.
X
C
§
2
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