LM102.PDF

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 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/ m s

Y Low input current Ð 10 nA (max)

Y High input resistance Ð 10,000 M X

Y No external frequency compensation required

Y Simple offset balancing with optional 1 k X

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

TL/H/7753

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

Operating Free Air Temperature Range

LM102

b 55 § Cto a 125 § C

LM302

0 § Cto a 70 § C

Storage Temperature Range

b 65 § Cto a 150 § C

g 18V

Lead Temperature (Soldering, 10 sec.)

300 § C

Power Dissipation (Note 1)

500 mW

ESD rating to be determined.

Input Voltage (Note 2)

g 15V

Output Short Circuit Duration (Note 3)

Indefinite

Electrical Characteristics (Note 4)

Parameter

Conditions

LM102

LM302

Units

Min

Typ Max Min

Type Max

Input Offset Voltage T A e 25 § C

15 mV

Input Bias Current

T A e 25 § C

Input Resistance

T A e 25 § C

10 10

10 12

10 9

10 12

Input Capacitance

3.0

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 8k X

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

m V/ § C

Temperature Drift

Input Bias Current

T A e T A MAX

3.0

T A e T A MIN

100

Large Signal Voltage V S e g 15V, V OUT e g 10V,

0.999

Gain

R L e 10 k X

Output Voltage

V S e g 15V, R L e 10 k X

g 10

Swing

(Note 5)

Supply Current

T A e 125 § C

2.6

4.0

Supply Voltage

g 12V s V S s g 15V

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 k X (5 k X 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 k X resistor

should be inserted in series with the input, physically close to the input pin to minimize the stray capacitance and prevent

oscillation.

Guaranteed Performance Characteristics LM102

Input Current

Output Swing

Supply Current

TL/H/7753±7

Typical Performance Characteristics LM102

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

Guaranteed Performance Characteristics LM302

Input Current

Output Swing

Supply Current

TL/H/7753±9

Typical Performance Characteristics LM302

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±10

Typical Applications

Low Pass Active Filter

*Values are for 10 kHz cutoff. Use sil-

vered mica capacitors for good tem-

perature stability.

TL/H/7753±3

Sample and Hold with Offset Adjustment

*Polycarbonate-dielectric capacitor.

TL/H/7753±4

High Pass Active Filter

*Values are for 100 Hz cutoff. Use

metalized polycarbonate capacitors

for good temperature stability.

TL/H/7753±5

High Input Impedance AC Amplifier

TL/H/7753±6

Plik z chomika:

Inne pliki z tego folderu:

Inne foldery tego chomika: