NSC LM302H Datasheet

TL/H/7753

LM102/LM302 Voltage Followers

November 1994

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

g

12V andg15V, also features low input
capacitance as well as excellent small signal and large sig­nal frequency responseÐall 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 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

Schematic Diagram

TL/H/7753– 1

C

1995 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§Ctoa125§C

LM302 0

§

Ctoa70§C

Storage Temperature Range

b

65§Ctoa150§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§C10

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

8kX

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

620mV/

§

C

Temperature Drift

Input Bias Current T

A

e

TAMAX 3 10 3.0 15 nA

T

A

e

TAMIN 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

12VsV

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

12VsV

S

s

g

15V andb55§CsT

A

s

125§C for the LM102 and 0§CsT

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