LM148/LM248/LM348
Quad741OpAmps
GeneralDescription
TheLM148seriesisatruequad741.Itconsistsoffour
independent,highgain,internallycompensated,lowpower
operationalamplifierswhichhavebeendesignedtoprovide
functionalcharacteristicsidenticaltothoseofthefamiliar
741operationalamplifier.Inadditionthetotalsupplycurrent
forallfouramplifiersiscomparabletothesupplycurrentofa
single741typeopamp.Otherfeaturesincludeinputoffset
currentsandinputbiascurrentwhicharemuchlessthan
thoseofastandard741.Also,excellentisolationbetween
amplifiershasbeenachievedbyindependentlybiasingeach
amplifierandusinglayouttechniqueswhichminimizether-
malcoupling.
TheLM148canbeusedanywheremultiple741or1558type
amplifiersarebeingusedandinapplicationswhereamplifier
matchingorhighpackingdensityisrequired.Forlower
powerrefertoLF444.
Features
n741opampoperatingcharacteristics
nClassABoutputstage—nocrossoverdistortion
nPincompatiblewiththeLM124
nOverloadprotectionforinputsandoutputs
nLowsupplycurrentdrain:0.6mA/Amplifier
nLowinputoffsetvoltage:1mV
nLowinputoffsetcurrent:4nA
nLowinputbiascurrent30nA
nHighdegreeofisolationbetweenamplifiers:120dB
nGainbandwidthproduct
nLM148(unitygain):1.0MHz
SchematicDiagram
00778601
1pFintheLM149
November2003
LM148/LM248/LM348
Series
Quad
741
Op
Amp
?2003NationalSemiconductorCorporationDS007786www.national.com
AbsoluteMaximumRatings(Note4)
IfMilitary/Aerospacespecifieddevicesarerequired,
pleasecontacttheNationalSemiconductorSalesOffice/
Distributorsforavailabilityandspecifications.
LM148LM248LM348
SupplyVoltage±22V±18V±18V
DifferentialInputVoltage±44V±36V±36V
OutputShortCircuitDuration(Note1)ContinuousContinuousContinuous
PowerDissipation(P
d
at25?C)and
ThermalResistance(θ
jA
),(Note2)
MoldedDIP(N)P
d
——750mW
θ
jA
——100?C/W
CavityDIP(J)P
d
1100mW800mW700mW
θ
JA
110?C/W110?C/W110?C/W
MaximumJunctionTemperature(T
jMAX
)150?C110?C100?C
OperatingTemperatureRange?55?C≤T
A
≤+125?C?25?C≤T
A
≤+85?C0?C≤T
A
≤+70?C
StorageTemperatureRange?65?Cto+150?C?65?Cto+150?C?65?Cto+150?C
LeadTemperature(Soldering,10sec.)Ceramic300?C300?C300?C
LeadTemperature(Soldering,10sec.)Plastic260?C
SolderingInformation
Dual-In-LinePackage
Soldering(10seconds)260?C260?C260?C
SmallOutlinePackage
VaporPhase(60seconds)215?C215?C215?C
Infrared(15seconds)220?C220?C220?C
SeeAN-450“SurfaceMountingMethodsandTheirEffectonProductReliability”forothermethodsofsolderingsurface
mount
devices.
ESDtolerance(Note5)500V500V500V
ElectricalCharacteristics
(Note3)
ParameterConditionsLM148LM248LM348Units
MinTypMaxMinTypMaxMinTypMax
InputOffsetVoltageT
A
=25?C,R
S
≤10k?1.05.01.06.01.06.0mV
InputOffsetCurrentT
A
=25?C425450450nA
InputBiasCurrentT
A
=25?C301003020030200nA
InputResistanceT
A
=25?C0.82.50.82.50.82.5M?
SupplyCurrentAllAmplifiersT
A
=25?C,V
S
=±15V2.43.62.44.52.44.5mA
LargeSignalVoltageGainT
A
=25?C,V
S
=±15V501602516025160V/mV
V
OUT
=±10V,R
L
≥2k?
AmplifiertoAmplifierT
A
=25?C,f=1Hzto20kHz
Coupling(InputReferred)SeeCrosstalk?120?120?120dB
TestCircuit
SmallSignalBandwidthT
A
=25?C,
LM148Series
1.01.01.0MHz
PhaseMarginT
A
=25?C,
LM148Series(A
V
=1)
606060degrees
SlewRateT
A
=25?C,
LM148Series(A
V
=1)
0.50.50.5V/μs
OutputShortCircuitCurrentT
A
=25?C252525mA
InputOffsetVoltageR
S
≤10k?6.07.57.5mV
InputOffsetCurrent75125100nA
LM148/LM248/LM348
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ElectricalCharacteristics(Continued)
(Note3)
ParameterConditionsLM148LM248LM348Units
MinTypMaxMinTypMaxMinTypMax
InputBiasCurrent325500400nA
LargeSignalVoltageGainV
S
=±15V,V
OUT
=±10V,251515V/mV
R
L
>2k?
OutputVoltageSwingV
S
=±15V,R
L
=10k?±12±13±12±13±12±13V
R
L
=2k?±10±12±10±12±10±12V
InputVoltageRangeV
S
=±15V±12±12±12V
Common-ModeRejectionR
S
≤10k?709070907090dB
Ratio
SupplyVoltageRejectionR
S
≤10k?,±5V≤V
S
≤±15V779677967796dB
Note1:Anyoftheamplifieroutputscanbeshortedtogroundindefinitely;however,morethanoneshouldnotbesimultaneouslyshortedasthemaximumjunction
temperaturewillbeexceeded.
Note2:ThemaximumpowerdissipationforthesedevicesmustbederatedatelevatedtemperaturesandisdicatedbyT
JMAX
,θ
JA
,andtheambienttemperature,
T
A
.ThemaximumavailablepowerdissipationatanytemperatureisP
d
=(T
JMAX
?T
A
)/θ
JA
orthe25?CP
DMAX
,whicheverisless.
Note3:ThesespecificationsapplyforV
S
=±15Vandovertheabsolutemaximumoperatingtemperaturerange(T
L
≤T
A
≤T
H
)unlessotherwisenoted.
Note4:RefertoRETS148XforLM148militaryspecifications.
Note5:Humanbodymodel,1.5k?inserieswith100pF.
CrossTalkTestCircuitV
S
=±15V
0077860600778607
00778643
LM148/LM248/LM348
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TypicalPerformanceCharacteristics
SupplyCurrentInputBiasCurrent
00778623
00778624
VoltageSwingPositiveCurrentLimit
00778625
00778626
NegativeCurrentLimitOutputImpedance
00778627
00778628
LM148/LM248/LM348
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TypicalPerformanceCharacteristics(Continued)
Common-ModeRejectionRatioOpenLoopFrequencyResponse
00778629
00778630
BodePlotLM148LargeSignalPulseResponse(LM148)
00778631
00778633
SmallSignalPulseResponse(LM148)UndistortedOutputVoltageSwing
0077863500778637
LM148/LM248/LM348
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TypicalPerformanceCharacteristics(Continued)
GainBandwidthSlewRate
0077863800778639
InvertingLargeSignalPulseResponse(LM148)InputNoiseVoltageandNoiseCurrent
00778641
00778642
PositiveCommon-ModeInputVoltageLimitNegativeCommon-ModeInputVoltageLimit
00778643
00778605
LM148/LM248/LM348
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ApplicationHints
TheLM148seriesarequadlowpower741opamps.Inthe
proliferationofquadopamps,thesearethefirsttoofferthe
convenienceoffamiliar,easytouseoperatingcharacteris-
ticsofthe741opamp.Inthoseapplicationswhere741op
ampshavebeenemployed,theLM148seriesopampscan
beemployeddirectlywithnochangeincircuitperformance.
Thepackagepin-outsaresuchthattheinvertinginputof
eachamplifierisadjacenttoitsoutput.Inaddition,the
amplifieroutputsarelocatedinthecornersofthepackage
whichsimplifiesPCboardlayoutandminimizespackage
relatedcapacitivecouplingbetweenamplifiers.
Theinputcharacteristicsoftheseamplifiersallowdifferential
inputvoltageswhichcanexceedthesupplyvoltages.In
addition,ifeitheroftheinputvoltagesiswithintheoperating
common-moderange,thephaseoftheoutputremainscor-
rect.Ifthenegativelimitoftheoperatingcommon-mode
rangeisexceededatbothinputs,theoutputvoltagewillbe
positive.Forinputvoltageswhichgreatlyexceedthemaxi-
mumsupplyvoltages,eitherdifferentiallyorcommon-mode,
resistorsshouldbeplacedinserieswiththeinputstolimit
thecurrent.
LiketheLM741,theseamplifierscaneasilydrivea100pF
capacitiveloadthroughouttheentiredynamicoutputvoltage
andcurrentrange.However,ifverylargecapacitiveloads
mustbedrivenbyanon-invertingunitygainamplifier,a
resistorshouldbeplacedbetweentheoutput(andfeedback
connection)andthecapacitancetoreducethephaseshift
resultingfromthecapacitiveloading.
Theoutputcurrentofeachamplifierinthepackageislimited.
Shortcircuitsfromanoutputtoeithergroundorthepower
supplieswillnotdestroytheunit.However,ifmultipleoutput
shortsoccursimultaneously,thetimedurationshouldbe
shorttopreventtheunitfrombeingdestroyedasaresultof
excessivepowerdissipationintheICchip.
Aswithmostamplifiers,careshouldbetakenleaddress,
componentplacementandsupplydecouplinginorderto
ensurestability.Forexample,resistorsfromtheoutputtoan
inputshouldbeplacedwiththebodyclosetotheinputto
minimize“pickup”andmaximizethefrequencyofthefeed-
backpolewhichcapacitancefromtheinputtogroundcre-
ates.
Afeedbackpoleiscreatedwhenthefeedbackaroundany
amplifierisresistive.Theparallelresistanceandcapacitance
fromtheinputofthedevice(usuallytheinvertinginput)toAC
groundsetthefrequencyofthepole.Inmanyinstancesthe
frequencyofthispoleismuchgreaterthantheexpected3
dBfrequencyoftheclosedloopgainandconsequentlythere
isnegligibleeffectonstabilitymargin.However,ifthefeed-
backpoleislessthanapproximatelysixtimestheexpected
3dBfrequencyaleadcapacitorshouldbeplacedfromthe
outputtotheinputoftheopamp.Thevalueoftheadded
capacitorshouldbesuchthattheRCtimeconstantofthis
capacitorandtheresistanceitparallelsisgreaterthanor
equaltotheoriginalfeedbackpoletimeconstant.
TypicalApplications—LM148
OneDecadeLowDistortionSinewaveGenerator
00778608
f
MAX
=5kHz,THD≤0.03%
R1=100kpot.C1=0.0047μF,C2=0.01μF,C3=0.1μF,R2=R6=R7=1M,
R3=5.1k,R4=12?,R5=240?,Q=NS5102,D1=1N914,D2=3.6Vavalanche
diode(ex.LM103),V
S
=±15V
AsimplerversionwithsomedistortiondegradationathighfrequenciescanbemadebyusingA1asasimpleinvertingamplifier,andbyputtingbacktoback
zenersinthefeedbackloopofA3.
LM148/LM248/LM348
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TypicalApplications—LM148(Continued)
LowCostInstrumentationAmplifier
00778609
V
S
=±15V
R=R2,trimR2toboostCMRR
LowDriftPeakDetectorwithBiasCurrentCompensation
00778610
AdjustRforminimumdrift
D3lowleakagediode
D1addedtoimprovespeed
V
S
=±15V
LM148/LM248/LM348
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TypicalApplications—LM148(Continued)
UniversalState-VariableFilter
00778611
TuneQthroughR0,
Forpredictableresults:f
O
Q≤4x10
4
UseBandPassoutputtotuneforQ
LM148/LM248/LM348
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TypicalApplications—LM148(Continued)
A1kHz4PoleButterworth
00778612
Usegeneralequations,andtuneeachsectionseparately
Q
1stSECTION
=0.541,Q
2ndSECTION
=1.306
Theresponseshouldhave0dBpeaking
A3AmplifierBi-QuadNotchFilter
00778613
Ex:f
NOTCH
=3kHz,Q=5,R1=270k,R2=R3=20k,R4=27k,R5=20k,R6=R8=10k,R7=100k,C1=C2=0.001μF
Betternoiseperformancethanthestate-spaceapproach.
LM148/LM248/LM348
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TypicalApplications—LM148(Continued)
A4thOrder1kHzEllipticFilter(4Poles,4Zeros)
00778614
R1C1=R2C2=t
R''1C''1=R''2C''2=t''
f
C
=1kHz,f
S
=2kHz,f
p
=0.543,f
Z
=2.14,Q=0.841,f''
P
=0.987,f''
Z
=4.92,Q''=4.403,normalizedtorippleBW
UsetheBPoutputstotuneQ,Q'',tunethe2sectionsseparately
R1=R2=92.6k,R3=R4=R5=100k,R6=10k,R0=107.8k,R
L
=100k,R
H
=155.1k,
R''1=R''2=50.9k,R''4=R''5=100k,R''6=10k,R''0=5.78k,R''
L
=100k,R''
H
=248.12k,R''f=100k.Allcapacitorsare0.001μF.
LowpassResponse
00778615
LM148/LM248/LM348
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TypicalSimulation
LM148,LM741MacromodelforComputerSimulation
00778621
Formoredetails,seeIEEEJournalofSolid-StateCircuits,Vol.SC-9,No.6,December1974
Note6:
o1
=112I
S
=8x10
?16
Note7:
o2
=144C2=6pFforLM149
00778622
LM148/LM248/LM348
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ConnectionDiagram
00778602
TopView
OrderNumberLM148J,LM148J/883,LM248J,LM348M,orLM348N
SeeNSPackageNumberJ14A,M14AorN14A
LM148JisavailableperJM38510/11001
LM148/LM248/LM348
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PhysicalDimensionsinches(millimeters)
unlessotherwisenoted
CeramicDual-In-LinePackage(J)
OrderNumberLM148J,LM148J/883,LM248J
NSPackageNumberJ14A
S.O.Package(M)
OrderNumberLM348MorLM348MX
NSPackageNumberM14A
LM148/LM248/LM348
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PhysicalDimensionsinches(millimeters)unlessotherwisenoted(Continued)
MoldedDual-In-LinePackage(N)
OrderNumberLM348N
NSPackageNumberN14A
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intothebody,or(b)supportorsustainlife,and
whosefailuretoperformwhenproperlyusedin
accordancewithinstructionsforuseprovidedinthe
labeling,canbereasonablyexpectedtoresultina
significantinjurytotheuser.
2.Acriticalcomponentisanycomponentofalife
supportdeviceorsystemwhosefailuretoperform
canbereasonablyexpectedtocausethefailureof
thelifesupportdeviceorsystem,ortoaffectits
safetyoreffectiveness.
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LM148/LM248/LM348
Series
Quad
741
Op
Amp
Nationaldoesnotassumeanyresponsibilityforuseofanycircuitrydescribed,nocircuitpatentlicensesareimpliedandNationalreservestherightatanytimewithoutnoticetochangesaidcircuitryandspecifications.
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