TL H 7753
LM102LM302
Voltage
Followers
November 1994
LM102 LM302 Voltage Followers
General Description
The LM102 series are high-gain operational amplifiers de-
signed specifically for unity-gain voltage follower applica-
tions 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 transis-
tors are operated at zero collector-base voltage to virtually
eliminate high temperature leakage currents It can there-
fore be operated in a temperature stabilized component
oven to get extremely low input currents and low offset volt-
age drift
The LM102 which is designed to operate with supply volt-
ages between
g
12V and
g
15V also features low input
capacitance as well as excellent small signal and large sig-
nal frequency response
all of which minimize high fre-
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
10V ms
Y
Low input current
10 nA (max)
Y
High input resistance
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
Schematic Diagram
TL H 7753 1
C1995 National Semiconductor Corporation
RRD-B30M115 Printed in U S A
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
b
55 C to
a
125 C
LM302
0 C to
a
70 C
Storage Temperature Range
b
65 C to
a
150 C
Lead Temperature (Soldering 10 sec )
300 C
ESD rating to be determined
Electrical Characteristics
(Note 4)
Parameter
Conditions
LM102
LM302
Units
Min
Typ
Max
Min
Type
Max
Input Offset Voltage
T
A
e
25 C
2
5
5
15
mV
Input Bias Current
T
A
e
25 C
3
10
10
30
nA
Input Resistance
T
A
e
25 C
10
10
10
12
10
9
10
12
X
Input Capacitance
3 0
3 0
pF
Large Signal Voltage
T
A
e
25 C V
S
g
15V
0 999
0 9996
0 9985
0 9995
1 0
V V
Gain
V
OUT
e
g
10V R
L
e
8 kX
Output Resistance
T
A
e
25 C
0 8
2 5
0 8
2 5
X
Supply Current
T
A
e
25 C
3 5
5 5
3 5
5 5
mA
Input Offset Voltage
7 5
20
mV
Offset Voltage
6
20
m
V C
Temperature Drift
Input Bias Current
T
A
e
T
A
MAX
3
10
3 0
15
nA
T
A
e
T
A
MIN
30
100
20
50
nA
Large Signal Voltage
V
S
e
g
15V V
OUT
e
g
10V
0 999
Gain
R
L
e
10 kX
Output Voltage
V
S
e
g
15V R
L
e
10 kX
g
10
g
10
V
Swing
(Note 5)
Supply Current
T
A
e
125 C
2 6
4 0
mA
Supply Voltage
g
12V
s
V
S
s g
15V
60
60
dB
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 C W junction to ambient or 20 C W junction to case
Note 2
For supply voltages less than
g
15V the absolute maximum input voltage is equal to the supply voltage
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
g
12V
s
V
S
s
g
15V and
b
55 C
s
T
A
s
125 C for the LM102 and 0 C
s
T
A
s
70 C for the LM302 unless otherwise
specified
Note 5
Increased output swing under load can be obtained by connecting an external resistor between the booster and V
b
terminals See curve
Note 6
Refer to RETS102X for the LM102H military specifications
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
2
Guaranteed Performance Characteristics
LM102
Input Current
Output Swing
Supply Current
TL H 7753 7
Typical Performance Characteristics
LM102
Voltage Gain and Phase Lag
Voltage Gain and Phase Lag
Output Resistance
Positive Output Swing
Negative Output Swing
Output Swing
Large Signal Frequency Response
Large Signal Pulse Response
Maximum Power Dissipation
TL H 7753 8
3
Guaranteed Performance Characteristics
LM302
Input Current
Output Swing
Supply Current
TL H 7753 9
Typical Performance Characteristics
LM302
Voltage Gain and Phase Lag
Voltage Gain and Phase Lag
Output Resistance
Positive Output Swing
Negative Output Swing
Output Swing
Frequency Response
Large Signal
Large Signal Pulse Response
Maximum Power Dissipation
TL H 7753 10
4
Typical Applications
Low Pass Active Filter
TL H 7753 3
Values are for 10 kHz cutoff Use sil-
vered mica capacitors for good tem-
perature stability
Sample and Hold with Offset Adjustment
TL H 7753 4
Polycarbonate-dielectric capacitor
High Pass Active Filter
TL H 7753 5
Values are for 100 Hz cutoff Use
metalized polycarbonate capacitors
for good temperature stability
High Input Impedance AC Amplifier
TL H 7753 6
5
Connection Diagram
Metal Can Package
Top View
TL H 7753 2
Order Number LM102H 883
See NS Package Number H08C
LM102LM302
Voltage
Followers
Physical Dimensions
inches (millimeters)
Metal Can Package (H)
Order Number LM102H 883
NS Package Number H08C
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failure to perform when properly used in accordance
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with instructions for use provided in the labeling can
effectiveness
be reasonably expected to result in a significant injury
to the user
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