JM38510/10104BGA - NATIONAL SEMICONDUCTOR

LM108AJAN

LM108AJAN Operational Amplifiers

Literature Number: SNOSAJ6B

LM108AJAN

OBSOLETE

September 29, 2010

Operational Amplifiers

General Description

The LM108 is a precision operational amplifier having speci-

fications a factor of ten better than FET amplifiers over a −55°

C to +125°C temperature range.

The devices operate with supply voltages from ±2V to ±20V

and have sufficient supply rejection to use unregulated sup-

plies. Although the circuit is interchangeable with, and uses

the same compensation as the LM101A, an alternate com-

pensation scheme can be used to make it particularly insen-

sitive to power supply noise and to make supply bypass

capacitors unnecessary.

The low current error of the LM108 makes possible many de-

signs that are not practical with conventional amplifiers. In

fact, it operates from 10 MΩ source resistances, introducing

less error than devices such as the 709 with 10 kΩ sources.

Integrators with drifts less than 500 μV/sec and analog time

delays in excess of one hour can be made using capacitors

no larger than 1 μF.

Features

■Maximum input bias current of 3.0 nA over temperature

■Offset current less than 400 pA over temperature

■Supply current of only 300 μA, even in saturation

■Guaranteed drift characteristics

Ordering Information

NS PART NUMBER SMD PART NUMBER NS PACKAGE NUMBER PACKAGE DISCRIPTION

JL108ABGA JM38510/10104BGA H08C 8LD Metal Can

JL108ABPA JM38510/10104BPA J08A 8LD CERDIP

JL108ABCA JM38510/10104BCA J14A 14LD CERDIP

JL108ABHA JM38510/10104BHA W10A 10LD CERPACK

JL108ABZA JM38510/10104BZA WG10A 10LD Ceramic SOIC

JL108ASGA JM38510/10104SGA H08C 8LD Metal Can

JL108ASPA JM38510/10104SPA J08A 8LD CERDIP

JL108ASCA JM38510/10104SCA J14A 14LD CERDIP

JL108ASHA JM38510/10104SHA W10A 10LD CERPACK

Connection Diagrams

Metal Can Package

20129413

*Package is connected to Pin 4 (V−)

**Unused pin (no internal connection) to allow for input anti-leakage guard

ring on printed circuit board layout.

See NS Package Number H08C

Dual-In-Line Package

20129415

Top View

See NS Package Number J08A

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LM108AJAN Operational Amplifiers

20129416

Top View

See NS Package Number J14A

20129417

Top View

See NS Package Number W10A, WG10A

Schematic Diagram

20129408

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LM108AJAN

Compensation Circuits

Standard Compensation Circuit

20129401

CO = 30 pF

**Bandwidth and slew rate are proportional to 1/Cf

Alternate Frequency Compensation

(Note 1)

20129402

**Bandwidth and slew rate are proportional to 1/CS

Note 1: Improves rejection of power supply noise by a factor of ten.

Feedforward Compensation

20129403

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LM108AJAN

Absolute Maximum Ratings (Note 2)

Supply Voltage ±22V

Power Dissipation (Note 3)

Metal Can 8LD 330mW @ +125°C

CERDIP 14LD 400mW @ +125°C

CERDIP 8LD 400mW @ +125°C

CERPACK 10LD 330mW @ +125°C

Ceramic SOIC 10LD 330mW @ +125°C

Differential Input Current (Note 4) ±10 mA

Differential Input Voltage(Note 6) ±30V

Input Voltage (Note 5) ±20V

Output Short-Circuit Duration Continuous

Operating Temperature Range −55°C ≤TA≤ +125°C

Storage Temperature Range −65°C ≤TA≤ +150°C

Thermal Resistance

θJA

Metal Can 8LD Still Air

500LF / Min Air Flow

150°C/W

86°C/W

CERDIP 14LD Still Air

500LF / Min Air Flow

94°C/W

55°C/W

CERDIP 8LD Still Air

500LF / Min Air Flow

120°C/W

68°C/W

CERPACK 10LD Still Air

500LF / Min Air Flow

225°C/W

142°C/W

Ceramic SOIC 10LD Still Air

500LF / Min Air Flow

225°C/W

142°C/W

θJC

Metal Can 8LD 38°C/W

CERDIP 14LD 13°C/W

CERDIP 8LD 17°C/W

CERPACK 10LD 21°C/W

Ceramic SOIC 10LD 21°C/W

Package Weight (typical)

Metal Can 8LD 990mg

CERDIP 14LD 2,180mg

CERDIP 8LD 1,090mg

CERPACK 10LD 225mg

Ceramic SOIC 10LD 210mg

Maximum Junction Teperature 175°C

Lead Temperature (Soldering, 10 sec) 300°C

ESD Tolerance (Note 7) 2000V

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LM108AJAN

Quality Conformance Inspection

Mil-Std-883, Method 5005 - Group A

Subgroup Description Temp (°C)

1 Static tests at +25°C

2 Static tests at +125°C

3 Static tests at −55°C

4 Dynamic tests at +25°C

5 Dynamic tests at +125°C

6 Dynamic tests at −55°C

7 Functional tests at +25°C

8A Functional tests at +125°C

8B Functional tests at −55°C

9 Switching tests at +25°C

10 Switching tests at +125°C

11 Switching tests at −55°C

LM108A Electrical Characteristics

DC Parameters

The following conditions apply to all the following parameters, unless otherwise specified.

DC: +VCC = +20V, −VCC = −20V, VCM = 0V, RS = 50Ω

Symbol Parameter Conditions Notes Min Max Units Sub-

groups

VIO Input Offset Voltage +VCC = 35V, -VCC = -5V,

VCM = -15V

-0.5 0.5 mV 1

-1 1 mV 2, 3

+VCC = 5V, -VCC = -35V,

VCM = 15V

-0.5 0.5 mV 1

-1 1 mV 2, 3

-0.5 0.5 mV 1

-1 1 mV 2, 3

+VCC = +5V, -VCC = -5V -0.5 0.5 mV 1

-1 1 mV 2, 3

Delta VIO /

Delta T

Temperature Coeffient of Input

Offset Voltage

25°C ≤ TA ≤ +125°C (Note 8) -5 5 µV/°C 2

25°C ≤ TA ≤ -55°C (Note 8) -5 5 µV/°C 3

IIO Input Offset Current +VCC = 35V, -VCC = -5V,

VCM = -15V

-0.2 0.2 nA 1

-0.4 0.4 nA 2, 3

+VCC = 5V, -VCC = -35V,

VCM = 15V

-0.2 0.2 nA 1

-0.4 0.4 nA 2, 3

-0.2 0.2 nA 1

-0.4 0.4 nA 2, 3

+VCC = +5V, -VCC = -5V -0.2 0.2 nA 1

-0.4 0.4 nA 2, 3

Delta IIO /

Delta T

Temperature Coeffient of Input

Offset Current

25°C ≤ TA ≤ +125°C (Note 8) -2.5 2.5 pA/°C 2

25°C ≤ TA ≤ -55°C (Note 8) -2.5 2.5 pA/°C 3

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LM108AJAN

Symbol Parameter Conditions Notes Min Max Units Sub-

groups

±IIB Input Bias Current +VCC = 35V, -VCC = -5V,

VCM = -15V

-0.1 2 nA 1

-1 2 nA 2

-0.1 3 nA 3

+VCC = 5V, -VCC = -35V,

VCM = 15V

-0.1 2 nA 1

-1 2 nA 2

-0.1 3 nA 3

-0.1 2 nA 1

-1 2 nA 2

-0.1 3 nA 3

+VCC = +5V, -VCC = -5V -0.1 2 nA 1

-1 2 nA 2

-0.1 3 nA 3

+PSRR Power Supply Rejection Ratio +VCC = 10V, -VCC = -20V -16 16 µV/V 1, 2, 3

-PSRR Power Supply Rejection Ratio +VCC = 20V, -VCC = -10V -16 16 µV/V 1, 2, 3

CMRR Common Mode Rejection Ratio VCM = ±15V 96 dB 1, 2, 3

+IOS Short Circuit Current +VCC = +15V, -VCC = -15V,

t ≤ 25mS -20 mA 1, 2, 3

−IOS Short Circuit Current +VCC = +15V, -VCC = -15V,

t ≤ 25mS 20 mA 1, 2, 3

ICC Power Supply Current +VCC = +15V, -VCC = -15V 0.6 mA 1, 2

0.8 mA 3

+VOP Output Voltage Swing RL = 10KΩ 16 V 4, 5, 6

−VOP Output Voltage Swing RL = 10KΩ -16 V 4, 5, 6

+AVS Open Loop Voltage Gain RL = 10KΩ, VO = +15V (Note 9) 80 V/mV 4

(Note 9) 40 V/mV 5, 6

−AVS Open Loop Voltage Gain RL = 10KΩ, VO = -15V (Note 9) 80 V/mV 4

(Note 9) 40 V/mV 5, 6

AVS Open Loop Voltage Gain +VCC = ±5V,

RL = 10KΩ, VO = ±2V (Note 9) 20 V/mV 4, 5, 6

AC Parameters

The following conditions apply to all the following parameters, unless otherwise specified.

AC +VCC = +20V, −VCC = −20V, VCM = 0V, RS = 50Ω

Symbol Parameter Conditions Notes Min Max Units Sub-

groups

TRTR Transient Response Rise Time RL = 10KΩ, CL = 100pF,

f < 1KHz, VI = +50mV 1000 nS 7, 8A, 8B

TROS Transient Response Overshoot RL = 10KΩ, CL = 100pF,

f < 1KHz, VI = +50mV 50 % 7, 8A, 8B

+SR Slew Rate AV = 1, VI = -5V to +5V 0.05 V/µS 7, 8A, 8B

−SR Slew Rate AV = 1, VI = +5V to -5V 0.05 V/µS 7, 8A, 8B

NIBB Noise Broadband BW = 10Hz to 5KHz, RS = 0Ω 15 µVrms 7

NIPC Noise Popcorn BW = 10Hz to 5KHz,

RS = 100KΩ 40 µVpk 7

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LM108AJAN

DC Parameters Drift Values

The following conditions apply to all the following parameters, unless otherwise specified.

DC +VCC = +20V, −VCC = −20V, VCM = 0V, RS = 50Ω

Delta calculations performed on JAN S devices at group B, Subgroup 5 only.

Symbol Parameter Conditions Notes Min Max Units Sub-

groups

VIO Input Offset Voltage -0.25 0.25 mV 1

±IIB Input Bias Current -0.5 0.5 nA 1

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

functional, but do not guarantee specific performance limits. For guaranteed specifications and test conditions, see the Electrical Characteristics. The guaranteed

specifications apply only for the test conditions listed. Some performance characteristics may degrade when the device is not operated under the listed test

conditions.

Note 3: The maximum power dissipation must be derated at elevated temperatures and is dictated by TJmax (maximum junction temperature), θJA (package

junction to ambient thermal resistance), and TA (ambient temperature). The maximum allowable power dissipation at any temperature is PDmax = (TJmax - TA) /

θJA or the number given in the Absolute Maximum Ratings, whichever is lower.

Note 4: The inputs are shunted with back-to-back diodes for over voltage protection. Therefore, excessive current will flow if a differential input voltage in excess

of 1V is applied between the inputs unless some limiting resistance is used.

Note 5: For supply voltages less than ±20V, the absolute maximum input voltage is equal to the supply voltage.

Note 6: This rating is ±1.0V unless resistances of 2KΩ or greater are inserted in series with the inputs to limit current in the input shunt diodes to the maximum

allowable value.

Note 7: Human body model, 1.5 kΩ in series with 100 pF.

Note 8: Calculated parameter

Note 9: Datalog reading in K = V/mV

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LM108AJAN

Typical Performance Characteristics

Input Currents

20129418

Offset Error

20129419

Drift Error

20129420

Input Noise Voltage

20129421

Power Supply Rejection

20129422

Closed Loop

Output Impedance

20129423

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LM108AJAN

Voltage Gain

20129424

Output Swing

20129425

Supply Current

20129426

Open Loop

Frequency Response

20129427

Large Signal

Frequency Response

20129428

Voltage Follower

Pulse Response

20129429

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LM108AJAN

Typical Applications

Sample and Hold

20129404

†Teflon polyethylene or polycarbonate dielectric capacitor

Worst case drift less than 2.5 mV/sec

High Speed Amplifier with Low Drift and Low Input Current

20129405

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LM108AJAN

Fast Summing Amplifier (Note 10)

20129412

*In addition to increasing speed, the LM101A raises high and low frequency gain, increases output drive capability and eliminates thermal feedback.

Note 10: Power Bandwidth: 250 KHz

Small Signal Bandwidth: 3.5 MHz

Slew Rate: 10V/μS

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LM108AJAN

Revision History Section

Date Released Revision Section Changes

02/25/05 A New release, corporate format 1 MDS data sheets converted into one Corp.

datasheet format. MJLM108A-X Rev 2A0. MDS

will be archived.

01/05/06 B DC Electrical's All temps. +Ios from -15 mA Min to -20 mA Min and

-Ios from +15 mA Max to +20 mA Max

09/24/10 C Obsolete Data Sheet Revision C, End of Life on Product/NSID Dec.

2008/09 Obsolete Data Sheet

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LM108AJAN

Physical Dimensions inches (millimeters) unless otherwise noted

Metal Can Package (H)

NS Package Number H08C

Ceramic Dual-In-Line Package (J)

NS Package Number J08A

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LM108AJAN

Ceramic Dual-In-Line Package (J)

NS Package Number J14A

S.O. Package (WG)

NS Package Number WG10A

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LM108AJAN

Ceramic Flatpack Package (W)

NS Package Number W10A

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LM108AJAN

LM108AJAN Operational Amplifiers

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