LM108H/883 - National Semiconductor

TL/H/7758

LM108/LM208/LM308 Operational Amplifiers

December 1994

LM108/LM208/LM308 Operational Amplifiers

General Description

The LM108 series are precision operational amplifiers hav-

ing specifications a factor of ten better than FET amplifiers

over a b55§Ctoa

125§C temperature range.

The devices operate with supply voltages from g2V to

g20V and have sufficient supply rejection to use unregulat-

ed supplies. Although the circuit is interchangeable with and

uses the same compensation as the LM101A, an alternate

compensation scheme can be used to make it particularly

insensitive to power supply noise and to make supply by-

pass capacitors unnecessary.

The low current error of the LM108 series makes possible

many designs that are not practical with conventional ampli-

fiers. In fact, it operates from 10 MXsource resistances,

introducing less error than devices like the 709 with 10 kX

sources. Integrators with drifts less than 500 mV/sec and

analog time delays in excess of one hour can be made us-

ing capacitors no larger than 1 mF.

The LM108 is guaranteed from b55§Ctoa

125§C, the

LM208 from b25§Ctoa

85§C, and the LM308 from 0§Cto

70§C.

Features

YMaximum input bias current of 3.0 nA over temperature

YOffset current less than 400 pA over temperature

YSupply current of only 300 mA, even in saturation

YGuaranteed drift characteristics

Compensation Circuits

Standard Compensation Circuit

CftR1 CO

R1 aR2

COe30 pF

TL/H/7758–1

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

Alternate*Frequency Compensation

TL/H/7758–2

*Improves rejection of power supply noise by a factor of ten.

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

Feedforward Compensation

TL/H/7758–3

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 5)

LM108/LM208 LM308

Supply Voltage g20V g18V

Power Dissipation (Note 1) 500 mW 500 mW

Differential Input Current (Note 2) g10 mA g10 mA

Input Voltage (Note 3) g15V g15V

Output Short-Circuit Duration Continuous Continuous

Operating Temperature Range (LM108) b55§Ctoa

125§C0

Ctoa

70§C

(LM208) b25§Ctoa85§C

Storage Temperature Range b65§Ctoa

150§Cb65§Ctoa

150§C

Lead Temperature (Soldering, 10 sec)

DIP 260§C 260§C

H Package Lead Temp

(Soldering 10 seconds) 300§C 300§C

Soldering Information

Dual-In-Line Package

Soldering (10 seconds) 260§C

Small Outline Package

Vapor Phase (60 seconds) 215§C

Infrared (15 seconds) 220§C

See AN-450 ‘‘Surface Mounting Methods and Their Effect on Product

Reliability’’ for other methods of soldering surface mount devices.

ESD Tolerance (Note 6) 2000V

Electrical Characteristics (Note 4)

Parameter Condition LM108/LM208 LM308 Units

Min Typ Max Min Typ Max

Input Offset Voltage TAe25§C 0.7 2.0 2.0 7.5 mV

Input Offset Current TAe25§C 0.05 0.2 0.2 1 nA

Input Bias Current TAe25§C 0.8 2.0 1.5 7 nA

Input Resistance TAe25§C 3070 1040 MX

Supply Current TAe25§C 0.3 0.6 0.3 0.8 mA

Large Signal Voltage TAe25§C, VSeg15V 50 300 25 300 V/mV

Gain VOUT eg10V, RLt10 kX

Input Offset Voltage 3.0 10 mV

Average Temperature

Coefficient of Input 3.0 15 6.0 30 mV/§C

Offset Voltage

Input Offset Current 0.4 1.5 nA

Average Temperature

Coefficient of Input 0.5 2.5 2.0 10 pA/§C

Offset Current

Input Bias Current 3.0 10 nA

Supply Current TAea

125§C 0.15 0.4 mA

Large Signal Voltage VSeg15V, VOUT eg10V 25 15 V/mV

Gain RLt10 kX

Output Voltage Swing VSeg15V, RLe10 kXg13 g14 g13 g14 V

Electrical Characteristics (Note 4) (Continued)

Parameter Condition LM108/LM208 LM308 Units

Min Typ Max Min Typ Max

Input Voltage Range VSeg15V g13.5 g14 V

Common Mode 85 100 80 100 dB

Rejection Ratio

Supply Voltage 80 96 80 96 dB

Rejection Ratio

Note 1: The maximum junction temperature of the LM108 is 150§C, for the LM208, 100§C and for the LM308, 85§C. For operating at elevated temperatures, devices

in the H08 package must be derated based on a thermal resistance of 160§C/W, junction to ambient, or 20§C/W, junction to case. The thermal resistance of the

dual-in-line package is 100§C/W, junction to ambient.

Note 2: The inputs are shunted with back-to-back diodes for overvoltage 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 3: For supply voltages less than g15V, the absolute maximum input voltage is equal to the supply voltage.

Note 4: These specifications apply for g5V sVSsg20V and b55§CsTAsa125§C, unless otherwise specified. With the LM208, however, all temperature

specifications are limited to b25§CsTAs85§C, and for the LM308 they are limited to 0§CsTAs70§C.

Note 5: Refer to RETS108X for LM108 military specifications and RETs 108AX for LM108A military specifications.

Note 6: Human body model, 1.5 kXin series with 100 pF.

Schematic Diagram

TL/H/7758–8

Typical Performance Characteristics LM108/LM208

Input Currents Offset Error Drift Error

Input Noise Voltage Power Supply Rejection Output Impedance

Closed Loop

Voltage Gain Output Swing Supply Current

Frequency Response

Open Loop

Frequency Response

Large Signal

Pulse Response

Voltage Follower

TL/H/7758–6

Typical Performance Characteristics LM308

Input Currents Offset Error Drift Error

Input Noise Voltage Power Supply Rejection Output Impedance

Closed Loop

Voltage Gain Output Swing Supply Current

Frequency Response

Open Loop

Frequency Response

Large Signal

Pulse Response

Voltage Follower

TL/H/7758–7

Typical Applications

Sample and Hold

²Teflon polyethylene or

polycarbonate dielectric

capacitor

Worst case drift less than

2.5 mV/sec

TL/H/7758–4

High Speed Amplifier with Low Drift and Low Input Current

TL/H/7758–5

Typical Applications (Continued)

Fast²Summing Amplifier

*In addition to increasing ²Power Bandwidth: 250 KHz

speed, the LM101A raises Small Signal Bandwidth: 3.5 MHz

high and low frequency Slew Rate: 10V/mS

gain, increases output

³C5 e6c10b8

drive capability and eliminates

thermal feedback.

TL/H/7758–12

Connection Diagrams

Metal Can Package

TL/H/7758–13

*Package is connected to Pin 4 (Vb)

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

ring on printed circuit board layout.

Order Number LM108H, LM108H/883,

LM308AH or LM308H

See NS Package Number H08C

Dual-In-Line Package

TL/H/7758–15

Top View

Order Number LM108J-8/883, LM308M or LM308N

See NS Package Number J08A, M08A or N08E

TL/H/7758–16

Top View

Order Number LM108J/883

See NS Package Number J14A

TL/H/7758–17

Order Number LM108W/883

See NS Package Number W10A

²Also available per JM38510/10104

Physical Dimensions inches (millimeters)

Ceramic Dual-In-Line Package (J)

Order Number LM108J/883

NS Package Number J08A

Ceramic Dual-In-Line Package (J)

Order Number LM108/883

NS Package Number J14A

Physical Dimensions inches (millimeters) (Continued)

Metal Can Package (H)

Order Number LM108H, LM108H/883 or LM308H

NS Package Number H08C

S.O. Package (M)

Order Number LM308M

NS Package Number M08A

LM108/LM208/LM308 Operational Amplifiers

Physical Dimensions inches (millimeters) (Continued)

Molded Dual-In-Line Package (N)

Order Number LM308N

NS Package Number N08E

Ceramic Flatpack Package (W)

Order Number LM108AW/883 or

LM108W/883

NS Package Number W10A

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failure to perform, when properly used in accordance support device or system, or to affect its safety or

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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