LM221H NSC [National Semiconductor], LM221H Datasheet

LM221H

Manufacturer Part Number

LM221H

Description

LM221/LM321 Precision Preamplifiers

Manufacturer

NSC [National Semiconductor]

Datasheet

1.LM221H.pdf (11 pages)

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C 1995 National Semiconductor Corporation

LM221 LM321 Precision Preamplifiers

General Description

The LM221 series are precision preamplifiers designed to

operate with general purpose operational amplifiers to dras-

tically decrease dc errors Drift bias current common mode

and supply rejection are more than a factor of 50 better than

standard op amps alone Further the added dc gain of the

LM221 decreases the closed loop gain error

The LM221 series operates with supply voltages from

unregulated supplies The operating current is programma-

ble from 5 A to 200 A so bias current offset current gain

and noise can be optimized for the particular application

while still realizing very low drift Super-gain transistors are

used for the input stage so input error currents are lower

than conventional amplifiers at the same operating current

Further the initial offset voltage is easily nulled to zero

The extremely low drift of the LM221 will improve accuracy

on almost any precision dc circuit For example instrumen-

tation amplifier strain gauge amplifiers and thermocouple

amplifiers now using chopper amplifiers can be made with

Typical Applications

20V and has sufficient supply rejection to operate from

TL H 7769

Thermocouple Amplifier with Cold Junction Compensation

the LM221 The full differential input and high common-

mode rejection are another advantage over choppers For

applications where low bias current is more important than

drift the operating current can be reduced to low values

High operating currents can be used for low voltage noise

with low source resistance The programmable operating

current of the LM221 allows tailoring the input characteris-

tics to match those of specialized op amps

The LM221 is specified over a

the LM321 over a 0 C to

Features

Guaranteed drift of LM321A 0 2 V C

Guaranteed drift of LM221 series 1 V C

Offset voltage less than 0 4 mV

Bias current less than 10 nA at 10 A operating current

CMRR 126 dB minimum

120 dB supply rejection

Easily nulled offset voltage

Set for 2 98V at output with LM113

shorted Output should equal ambi-

ent temperature at 10 mV K

Adjust for output reading in C

70 C temperature range

25 C to

RRD-B30M115 Printed in U S A

85 C range and

February 1995

TL H 7769 – 1

Related parts for LM221H

LM221H Summary of contents

Page 1

LM221 LM321 Precision Preamplifiers General Description The LM221 series are precision preamplifiers designed to operate with general purpose operational amplifiers to dras- tically decrease dc errors Drift bias current common mode and supply rejection are more than a factor of ...

Page 2

Absolute Maximum Ratings Supply Voltage Power Dissipation (Note 1) Differential Input Voltage (Notes 2 and 3) Input Voltage (Note 3) Electrical Characteristics (Note 4) LM321A Parameter Input Offset Voltage Input Offset Current T ...

Page 3

Absolute Maximum Ratings If Military Aerospace specified devices are required please contact the National Semiconductor Sales Office Distributors for availability and specifications Supply Voltage Power Dissipation (Note 1) Differential Input Voltage (Notes 2 and 3) Input Voltage (Note 3) Electrical ...

Page 4

Typical Performance Characteristics Input Bias Current Positive Power Supply Rejection Input Noise Current Set Resistor and Set Current Distribution of Offset Distribution of Offset Voltage Drift (Nulled) Voltage Drift (Nulled) Negative Power Supply Rejection Input Noise Voltage Voltage Drift Differential ...

Page 5

... Note Outputs are inverting from the input of the same number (Continued) Output Common-Mode Voltage Offset Voltage Adjustment Metal Can Package TL H 7769– 7 Top View Note Pin 4 connected to case LM221H LM321H or LM321AH See NS Package Number H08C 5 Differential Voltage Gain Common-Mode Rejection Ratio TL H 7769 – 10 ...

Page 6

Schematic Diagram 6 ...

Page 7

Frequency Compensation UNIVERSAL COMPENSATION The additional gain of the LM321 preamplifier when used with an operational amplifier usually necessitates additional frequency compensation When the closed loop gain of the op amp with the LM321 is less than the gain of ...

Page 8

Typical Applications (Continued) Gain of 1000 Instrumentation Amplifier High Speed Inverting Amplifier with Low Drift Medium Speed General Purpose Amplifier Offset adjust Gain trim Better than 1% linearity for input sig- nals gain stability typi- g ...

Page 9

Typical Applications (Continued) Increased Common-Mode Range at High Operating Currents Match Depends on close loop gain 7769 – 6 ...

Page 10

... Physical Dimensions inches (millimeters) Order Number LM221H LM321H or LM321AH LIFE SUPPORT POLICY NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF NATIONAL SEMICONDUCTOR CORPORATION As used herein 1 Life support devices or systems are devices or ...

Page 11

... This datasheet has been download from: www.datasheetcatalog.com Datasheets for electronics components. ...

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