LM221 LM321 Precision Preamplifiers LM221 series precision preamp

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LM221 LM321 Precision Preamplifiers LM221 series precision preamp

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LM221 LM321 Precision Preamplifiers
LM221 LM321 Precision Preamplifiers
LM221 series precision preamplifiers designed operate with general purpose operational amplifiers drastically decrease errors Drift bias current common mode supply rejection more than factor better than standard amps alone Further added gain LM221 decreases closed loop gain error LM221 series operates with supply voltages from sufficient supply rejection operate from unregulated supplies operating current programmable from bias current offset current gain noise optimized particular application while still realizing very drift Super-gain transistors used input stage input error currents lower than conventional amplifiers same operating current Further initial offset voltage easily nulled zero extremely drift LM221 will improve accuracy almost precision circuit example instrumentation amplifier strain gauge amplifiers thermocouple amplifiers using chopper amplifiers made with LM221 full differential input high commonmode rejection another advantage over choppers applications where bias current more important than drift operating current reduced values High operating currents used voltage noise with source resistance programmable operating current LM221 allows tailoring input characteristics match those specialized amps LM221 specified over range LM321 over temperature range
Features
Guaranteed drift LM321A Guaranteed drift LM221 series Offset voltage less than Bias current less than operating current CMRR minimum supply rejection Easily nulled offset voltage
Typical Applications
Thermocouple Amplifier with Cold Junction Compensation
output with LM113 shorted Output should equal ambient temperature Adjust output reading
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C1995 National Semiconductor Corporation
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RRD-B30M115 Printed
Absolute Maximum Ratings
Supply Voltage Power Dissipation (Note Differential Input Voltage (Notes Input Voltage (Note
Operating Temperature Range LM321A Storage Temperature Range Lead Temperature (Soldering rating determined
Electrical Characteristics (Note LM321A
LM321A Parameter Input Offset Voltage Input Offset Current Conditions RSET RSET RSET RSET RSET RSET RSET RSET RSET RSET RSET RSET RSET RSET 200X RSET Offset Voltage Nulled (Note RSET RSET RSET RSET RSET RSET RSET RSET RSOURCE
Units
Input Bias Current
Input Resistance
Supply Current Input Offset Voltage Input Bias Current Input Offset Current Input Offset Current Drift Average Temperature Coefficient Input Offset Voltage Long Term Stability Supply Current Input Voltage Range
Common-Mode Rejection Ratio Supply Voltage Rejection Ratio Voltage Gain Noise
Note maximum junction temperature LM321A operating elevated temperature devices package must derated based thermal resistance junction ambient junction case Note inputs shunted with back-to-back diodes series with 500X resistor overvoltage protection Therefore excessive current will flow differential input voltage excess applied between inputs Note supply voltages less than absolute maximum input voltage equal supply voltage Note These specifications apply unless otherwise specified With LM221A however temperature specifications limited LM321A specifications apply over temperature range Note External precision resistor placed from pins increase positive common-mode range Note RETS121X LM121H military specs RET121AX LM121AH military specs
Absolute Maximum Ratings
Military Aerospace specified devices required please contact National Semiconductor Sales Office Distributors availability specifications Supply Voltage Power Dissipation (Note Differential Input Voltage (Notes Input Voltage (Note
Operating Temperature Range LM221 LM121A (-883) LM121 (-883) LM321 LM321A Storage Temperature Range Lead Temperature (Soldering rating determined
LM321
Electrical Characteristics (Note LM221
Parameter Input Offset Voltage Input Offset Current Conditions
LM221
LM321
Units
RSET RSET RSET RSET RSET RSET RSET RSET RSET RSET RSET RSET RSET RSET 200X RSET Offset Voltage Nulled
Input Bias Current
Input Resistance
Supply Current Input Offset Voltage Input Bias Current Input Offset Current Input Offset Current Drift Average Temperature Coefficient Input Offset Voltage Long Term Stability Supply Current Input Voltage Range
(Note RSET RSET RSET RSET RSET RSET RSET RSET RSOURCE
Common-Mode Rejection Ratio Supply Voltage Rejection Ratio Voltage Gain Noise
Note maximum junction temperature LM221 maximum junction temperature LM321 operating elevated temperature devices package must derated based thermal resistance junction ambient junction case Note inputs shunted with back-to-back diodes series with 500X resistor overvoltage protection Therefore excessive current will flow differential input voltage excess applied between inputs Note supply voltages less than absolute maximum input voltage equal supply voltage Note These specifications apply unless otherwise specified With LM221 however temperature specifications limited LM321 specifications apply over temperature range Note External precision resistor placed from pins increase positive common-mode range
Typical Performance Characteristics
Input Bias Current Distribution Offset Voltage Drift (Nulled) Distribution Offset Voltage Drift (Nulled)
Positive Power Supply Rejection
Negative Power Supply Rejection
Input Noise Voltage
Input Noise Current
Voltage Drift
Differential Voltage Gain
Resistor Current
Current
Common-Mode Limits
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Typical Performance Characteristics
Common-Mode Limits
(Continued) Differential Voltage Gain
Output Common-Mode Voltage
Supply Current
Offset Voltage Adjustment
Common-Mode Rejection Ratio
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Connection Diagram
Metal Package
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View
Note connected case
Order Number LM121AH LM121H LM221H LM321H LM321AH Package Number H08C
Note Outputs inverting from input same number
Schematic Diagram
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Frequency Compensation
UNIVERSAL COMPENSATION additional gain LM321 preamplifier when used with operational amplifier usually necessitates additional frequency compensation When closed loop gain with LM321 less than gain LM321 alone more compensation needed worst case situation when there 100% feedback such voltage follower integrator gain LM321 high When high closed loop gains used example 1000 only addition gain inserted LM321 frequency compensation will usually suffice frequency compensation shown here designed operate with unity-gain stable Figure shows basic configuration frequency stabilizing network operation output LM321 rendered single ended bypass capacitor ground Overall frequency compensation then achieved integrating capacitor around 2qRSETC bandwidth 106RSET with higher frequency amps such LM118 bandwidth increased about closed loop gain greater than unity ``C'' decreased Bandwidth unity-gain RSET Table shows typical values compensating capacitors various gains operating currents TABLE Closed Loop Gain 1000 Current Resistor 1300
This table applies LM108 LM101A LM741 LM118 Capacitance DESIGN EQUATIONS LM321 SERIES RSET Null Value should RSET Operating Current RSET Gain Positive Common-Mode Limit RSET
ALTERNATE COMPENSATION compensation capacitors made equal improved power supply rejection this case formula compensation capscitor RSET
Typical Applications
Offset adjust table frequency compensation
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FIGURE Drift Using LM321A Preamp
Typical Applications (Continued)
Gain 1000 Instrumentation Amplifier
Offset adjust Gain trim Better than linearity input signals gain stability typical from Match effect power supply rejection
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High Speed Inverting Amplifier with Drift
Bandwidth Slew Rate
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Medium Speed General Purpose Amplifier
Bandwidth Slew Rate
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Typical Applications (Continued)
Increased Common-Mode Range High Operating Currents
Match Depends close loop gain
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LM221 LM321 Precision Preamplifiers
Physical Dimensions inches (millimeters)
Metal Package Order Number LM221H LM321H LM321AH Package Number H08C
LIFE SUPPORT POLICY NATIONAL'S PRODUCTS AUTHORIZED CRITICAL COMPONENTS LIFE SUPPORT DEVICES SYSTEMS WITHOUT EXPRESS WRITTEN APPROVAL PRESIDENT NATIONAL SEMICONDUCTOR CORPORATION used herein Life support devices systems devices systems which intended surgical implant into body support sustain life whose failure perform when properly used accordance with instructions provided labeling reasonably expected result significant injury user
National Semiconductor Corporation 1111 West Bardin Road Arlington 76017 1(800) 272-9959 1(800) 737-7018
critical component component life support device system whose failure perform reasonably expected cause failure life support device system affect safety effectiveness
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National does assume responsibility circuitry described circuit patent licenses implied National reserves right time without notice change said circuitry specifications

LM221 LM321 Precision Preamplifiers LM221 series precision preamp

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