LM101AJ - National Semiconductor

LM101A/LM201A/LM301A

Operational Amplifiers

General Description

The LM101A series are general purpose operational amplifi-

ers which feature improved performance over industry stan-

dards like the LM709. Advanced processing techniques

make possible an order of magnitude reduction in input cur-

rents, and a redesign of the biasing circuitry reduces the

temperature drift of input current. Improved specifications in-

clude:

•Offset voltage 3 mV maximum over temperature

(LM101A/LM201A)

•Input current 100 nA maximum over temperature

(LM101A/LM201A)

•Offset current 20 nA maximum over temperature

(LM101A/LM201A)

•Guaranteed drift characteristics

•Offsets guaranteed over entire common mode and sup-

ply voltage ranges

•Slew rate of 10V/µs as a summing amplifier

This amplifier offers many features which make its appli-

cation nearly foolproof: overload protection on the input

and output, no latch-up when the common mode range is

exceeded, and freedom from oscillations and compensa-

tion with a single 30 pF capacitor. It has advantages over

internally compensated amplifiers in that the frequency

compensation can be tailored to the particular applica-

tion. For example, in low frequency circuits it can be over-

compensated for increased stability margin. Or the com-

pensation can be optimized to give more than a factor of

ten improvement in high frequency performance for most

applications.

In addition, the device provides better accuracy and lower

noise in high impedance circuitry. The low input currents

also make it particularly well suited for long interval inte-

grators or timers, sample and hold circuits and low fre-

quency waveform generators. Further, replacing circuits

where matched transistor pairs buffer the inputs of con-

ventional IC op amps, it can give lower offset voltage and

a drift at a lower cost.

The LM101A is guaranteed over a temperature range of

−55˚C to +125˚C, the LM201A from −25˚C to +85˚C, and

the LM301A from 0˚C to +70˚C.

Connection Diagrams (Top View)

Dual-In-Line Package

DS007752-4

Order Number LM101AJ, LM101J/883 (Note 1),

LM201AN or LM301AN

See NS Package Number J08A or N08E

Ceramic Flatpack Package

DS007752-40

Order Number LM101AW/883 or LM101W/883

See NS Package Number W10A

September 1999

LM101A/LM201A/LM301A Operational Amplifiers

Connection Diagrams (Top View) (Continued)

Note 1: Available per JM38510/10103.

Metal Can Package

DS007752-2

Note: Pin 4 connected to case.

Order Number LM101AH, LM101AH/883 (Note 1),

LM201AH or LM301AH

See NS Package Number H08C

Dual-In-Line Package

DS007752-3

Order Number LM101AJ-14/883 (Note 1)

See NS Package Number J14A

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Absolute Maximum Ratings (Note 2)

If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/

Distributors for availability and specifications.

LM101A/LM201A LM301A

Supply Voltage ±22V ±18V

Differential Input Voltage ±30V ±30V

Input Voltage (Note 3) ±15V ±15V

Output Short Circuit Duration (Note 4) Continuous Continuous

Operating Ambient Temp. Range −55˚C to +125˚C (LM101A) 0˚C to +70˚C

−25˚C to +85˚C (LM201A)

Max

H-Package 150˚C 100˚C

N-Package 150˚C 100˚C

J-Package 150˚C 100˚C

Power Dissipation at T

=25˚C

H-Package (Still Air) 500 mW 300 mW

(400 LF/Min Air Flow) 1200 mW 700 mW

N-Package 900 mW 500 mW

J-Package 1000 mW 650 mW

Thermal Resistance (Typical) θ

H-Package (Still Air) 165˚C/W 165˚C/W

(400 LF/Min Air Flow) 67˚C/W 67˚C/W

N Package 135˚C/W 135˚C/W

J-Package 110˚C/W 110˚CmW

(Typical) θ

H-Package 25˚C/W 25˚C/W

Storage Temperature Range −65˚C to +150˚C −65˚C to +150˚C

Lead Temperature (Soldering, 10 sec.)

Metal Can or Ceramic 300˚C 300˚C

Plastic 260˚C 260˚C

ESD Tolerance (Note 7) 2000V 2000V

Electrical Characteristics (Note 5)

Parameter Conditions LM101A/LM201A LM301A Units

Min Typ Max Min Typ Max

Input Offset Voltage T

=25˚C, R

≤50 kΩ0.7 2.0 2.0 7.5 mV

Input Offset Current T

=25˚C 1.5 10 3.0 50 nA

Input Bias Current T

=25˚C 30 75 70 250 nA

Input Resistance T

=25˚C 1.5 4.0 0.5 2.0 MΩ

Supply Current T

=25˚C V

=±20V 1.8 3.0 mA

=±15V 1.8 3.0 mA

Large Signal Voltage Gain T

=25˚C, V

=±15V 50 160 25 160 V/mV

OUT

=±10V, R

≥2kΩ

Input Offset Voltage R

≤50 kΩ3.0 10 mV

Average Temperature Coefficient R

≤50 kΩ3.0 15 6.0 30 µV/˚C

of Input Offset Voltage

Input Offset Current 20 70 nA

Average Temperature Coefficient 25˚C ≤T

≤T

MAX

0.01 0.1 0.01 0.3 nA/˚C

of Input Offset Current T

MIN

≤T

≤25˚C 0.02 0.2 0.02 0.6 nA/˚C

Input Bias Current 0.1 0.3 µA

Supply Current T

MAX

=±

20V 1.2 2.5 mA

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Electrical Characteristics (Note 5) (Continued)

Parameter Conditions LM101A/LM201A LM301A Units

Min Typ Max Min Typ Max

Large Signal Voltage Gain V

=±15V, V

OUT

=±10V 25 15 V/mV

≥2k

Output Voltage Swing V

=±15V R

=10 kΩ±12 ±14 ±12 ±14 V

=2kΩ±

10 ±13 ±10 ±13 V

Input Voltage Range V

=±20V ±15 V

=±15V +15,

−13 ±12 +15,

−13 V

Common-Mode Rejection Ratio R

≤50 kΩ80 96 70 90 dB

Supply Voltage Rejection Ratio R

≤50 kΩ80 96 70 96 dB

Note 2: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur.Operating ratings indicate for which the device is functional, but

do no guarantee specific performance limits. Electrical Characteristics state DC andAC electrical specifications under particular test conditions which guarantee spe-

cific limits. This assumes that the device is within the Operating Ratings. Specifications are not guaranteed for parameters where no limit is given, however, the typical

value is a good indication of device performance.

Note 3: For supply voltages less than ±15V, the absolute maximum input voltage is equal to the supply voltage.

Note 4: Continuous short circuit is allowed for case temperatures to 125˚C and ambient temperatures to 75˚C for LM101A/LM201A, and 70˚C and 55˚C respectively

for LM301A.

Note 5: Unless otherwise specified, these specifications apply for C1 =30 pF, ±5V ≤VS≤±20V and −55˚C ≤TA≤+125˚C (LM101A), ±5V ≤VS≤±20V and −25˚C

≤TA≤+85˚C (LM201A), ±5V ≤VS≤±15V and 0˚C ≤TA≤+70˚C (LM301A).

Note 6: Refer to RETS101AX for LM101A military specifications and RETS101X for LM101 military specifications.

Note 7: Human body model, 100 pF discharged through 1.5 kΩ.

Guaranteed Performance Characteristics LM101A/LM201A

Guaranteed Performance Characteristics LM301A

Input Voltage Range

DS007752-41

Output Swing

DS007752-42

Voltage Gain

DS007752-43

Input Voltage Range

DS007752-44

Output Swing

DS007752-45

Voltage Gain

DS007752-46

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Typical Performance Characteristics

Supply Current

DS007752-47

Voltage Gain

DS007752-48

Maximum Power Dissipation

DS007752-49

Input Current,

LM101A/LM201A/LM301A

DS007752-50

Current Limiting

DS007752-51

Input Noise Voltage

DS007752-52

Input Noise Current

DS007752-53

Common Mode Rejection

DS007752-54

Power Supply Rejection

DS007752-55

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Typical Performance Characteristics (Continued)

Typical Performance Characteristics for Various Compensation Circuits

(Note 9)

Closed Loop Output

Impedance

DS007752-56

Single Pole Compensation

DS007752-8

CS=30pF

Two Pole Compensation

DS007752-12

CS=30pF

C2=10C1

Feedforward Compensation

DS007752-16

fo=3 MHz

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Typical Performance Characteristics for Various Compensation Circuits

(Note 9) (Continued)

Open Loop Frequency

Response

DS007752-9

Open Loop Frequency

Response

DS007752-13

Open Loop Frequency

Response

DS007752-17

Large Signal Frequency

Response

DS007752-10

Large Signal Frequency

Response

DS007752-14

Large Signal Frequency

Response

DS007752-18

Voltage Follower Pulse

Response

DS007752-11

Voltage Follower Pulse

Response

DS007752-15

Inverter Pulse Response

DS007752-19

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Typical Applications (Note 9)

Variable Capacitance Multiplier

DS007752-20

Simulated Inductor

DS007752-21

L≅R1 R2 C1

RS=R2

RP=R1

Fast Inverting Amplifier

with High Input Impedance

DS007752-22

Inverting Amplifier

with Balancing Circuit

DS007752-23

†May be zero or equal to parallel combination of R1 and R2 for minimum

offset.

Sine Wave Oscillator

DS007752-24

fo=10 kHz

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Typical Applications (Note 9) (Continued)

Application Hints (Note 9)

Although the LM101A is designed for trouble free operation,

experience has indicated that it is wise to observe certain

precautions given below to protect the devices from abnor-

mal operating conditions. It might be pointed out that the ad-

vice given here is applicable to practically any IC op amp, al-

though the exact reason why may differ with different

devices.

Integrator with Bias Current Compensation

DS007752-25

*Adjust for zero integrator drift. Current drift typically 0.1 nA/˚C over −55˚C to +125˚C temperature range.

Protecting Against Gross

Fault Conditions

DS007752-26

*Protects input

†Protects output

‡Protects output— not needed when R4 is used.

Compensating for Stray Input Capacitances

or Large Feedback Resistor

DS007752-27

Isolating Large Capacitive Loads

DS007752-28

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Application Hints (Note 9) (Continued)

When driving either input from a low-impedance source, a

limiting resistor should be placed in series with the input lead

to limit the peak instantaneous output current of the source

to something less than 100 mA. This is especially important

when the inputs go outside a piece of equipment where they

could accidentally be connected to high voltage sources.

Large capacitors on the input (greater than 0.1 µF) should be

treated as a low source impedance and isolated with a resis-

tor. Low impedance sources do not cause a problem unless

their output voltage exceeds the supply voltage. However,

the supplies go to zero when they are turned off, so the iso-

lation is usually needed.

The output circuitry is protected against damage from shorts

to ground. However, when the amplifier output is connected

to a test point, it should be isolated by a limiting resistor, as

test points frequently get shorted to bad places. Further,

when the amplifer drives a load external to the equipment, it

is also advisable to use some sort of limiting resistance to

preclude mishaps.

Precautions should be taken to insure that the power sup-

plies for the integrated circuit never become

reversed—even under transient conditions. With reverse

voltages greater than 1V, the IC will conduct excessive cur-

rent, fusing internal aluminum interconnects. If there is a

possibility of this happening, clamp diodes with a high peak

current rating should be installed on the supply lines. Rever-

sal of the voltage between V

and V

−

will always cause a

problem, although reversals with respect to ground may also

give difficulties in many circuits.

The minimum values given for the frequency compensation

capacitor are stable only for source resistances less than

10 kΩ, stray capacitances on the summing junction less than

5 pF and capacitive loads smaller than 100 pF. If any of

these conditions are not met, it becomes necessary to over-

compensate the amplifier with a larger compensation capaci-

tor. Alternately, lead capacitors can be used in the feedback

network to negate the effect of stray capacitance and large

feedback resistors or an RC network can be added to isolate

capacitive loads.

Although the LM101A is relatively unaffected by supply by-

passing, this cannot be ignored altogether. Generally it is

necessary to bypass the supplies to ground at least once on

every circuit card, and more bypass points may be required

if more than five amplifiers are used. When feed-forward

compensation is employed, however, it is advisable to by-

pass the supply leads of each amplifier with low inductance

capacitors because of the higher frequencies involved.

Typical Applications (Note 9)

Standard Compensation and

Offset Balancing Circuit

DS007752-29

Fast Voltage Follower

DS007752-31

Power Bandwidth: 15 kHz

Slew Rate: 1V/µs

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Typical Applications (Note 9) (Continued)

Fast Summing Amplifier

DS007752-30

Power Bandwidth: 250 kHz

Small Signal Bandwiidth: 3.5 MHz

Slew Rate: 10V/µs

Bilateral Current Source

DS007752-32

R3 =R4+R5

R1 =R2

Fast AC/DC Converter (Note 8)

DS007752-33

Note 8: Feedforward compensation can be used to make a fast full wave rectifier without a filter.

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Typical Applications (Note 9) (Continued)

Instrumentation Amplifier

DS007752-34

R1 =R4; R2 =R3

*,†Matching determines CMRR.

Integrator with Bias Current Compensation

DS007752-35

*Adjust for zero integrator drift. Current drift typically 0.1 nA/˚C over 0˚C to

+70˚C temperature range.

Voltage Comparator for Driving RTL Logic or High

Current Driver

DS007752-37

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Typical Applications (Note 9) (Continued)

Low Frequency Square Wave Generator

DS007752-36

Low Drift Sample and Hold

DS007752-38

*Polycarbonate-dielectric capacitor

Voltage Comparator for Driving

DTL or TTL Integrated Circuits

DS007752-39

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Schematic (Note 9)

Note 9: Pin connections shown are for 8-pin packages.

DS007752-1

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Physical Dimensions inches (millimeters) unless otherwise noted

Metal Can Package (H)

Order Number LM101AH, LM101AH/883

LM201AH or LM301AH

NS Package Number H08C

Ceramic Dual-In-Line Package (J)

Order Number LM101J/883 or LM101AJ

NS Package Number J08A

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Physical Dimensions inches (millimeters) unless otherwise noted (Continued)

Ceramic Dual-In-Line Package (J)

Order Number LM101AJ-14/883

NS Package Number J14A

Molded Dual-In-Line Package (N)

Order Number LM201AN or LM301AN

NS Package Number N08E

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Physical Dimensions inches (millimeters) unless otherwise noted (Continued)

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Ceramic Flatpack Package (W)

Order Number LM101AW/883 or LM101W/883

NS Package Number W10A

LM101A/LM201A/LM301A Operational Amplifiers

National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications.