COS2261TR

COS2261,COS2262,COS2264
www.cosine-ic.com 1Features
■LowQuiescentCurrent:
80μAat12Vsupply
65μAat5Vsupply
■GainBandwidthProduct:2.5MHz
■Operateson3.3V~16VSupplies
■SlewRate:0.8V/µs
■Rail-to-RailInputandOutput(RRIO)
■UnityGainStable
■NoPhaseReversal
■ExtendedTemperatureRanges
From-40°Cto+125°C
■SmallPackaging
COS2261availableinSOT23-5/SOP-8
COS2262availableinSOP-8/MSOP-8
COS2264availableinSOP14/TSSOP14
Applications
■WhiteGoods
■PortableEquipment
■SensorConditioning
■AnalogActiveFilters
■ConfigurationcontrolandPrintSupport
■BatteryPoweredSystems
■TransducerInterfacesGeneralDescription
TheCOS2261(single),COS2262(dual)and
COS2264(quad)arelowpower,rail-to-rail
inputandoutputamplifiersoperatedon3.3Vto
16Vsupplies.Despitetheirlowquiescent
current,theCOS226xfamilyprovidesexcellent
overallperformanceandversatility.Theyhave
bothrail-to-railinputandoutputrange.The
outputvoltageswingextendstowithin15mVof
eachrail,providingthemaximumoutput
dynamicrangewithexcellentoverdrive
recovery.
COS2261/2/4familyisunitygainstableand
hasagainbandwidthproductof2.5MHz
(typical).TheyprovidehighCMRRandPSRR
performanceandcanoperatefromasingle
supplyvoltageashighas16V.Thesefeatures
maketheCOS2261/2/4familywellsuitedfor
single-supply,battery-poweredapplications.
Theycanbeusedasplus-inreplacementsfor
manycommerciallyavailableop-ampsto
reducepowerandimproveinput/outputrange
andperformance.
Rev1.1
Copyright@2018CosineNanoelectronicsInc.Allrightsreserved
Theinformationprovidedhereisbelievedtobeaccurateandreliable.CosineNanoelectronicsassumes
noreliabilityforinaccuraciesandomissions.Specificationsdescribedandcontainedherearesubjected
tochangewithoutnoticeonthepurposeofimprovingthedesignandperformance.Allofthisinformation
describedhereinshouldnotbeimpliedorgrantedforanythirdparty.2.5MHz,16VRail-to-RailInput/Output
LowPowerOperationalAmplifiers
COS2261,COS2262,COS2264
www.cosine-ic.com 21.PinConfigurationandFunctions
COS2261 COS2261 COS2262 COS2264
PinFunctions
Name Description Note
+VsPositivepowersupplyAbypasscapacitorof0.1μFasclosetothepartas
possibleshouldbeplacedbetweenpowersupplypins
orbetweensupplypinsandground.
-VsNegativepowersupply
orgroundIfitisnotconnectedtoground,bypassitwitha
capacitorof0.1μFasclosetothepartaspossible.
-IN NegativeinputInvertinginputoftheamplifier.Voltagerangeofthis
pincangofrom-Vs-0.3Vto+Vs+0.3V.
+IN PositiveinputNon-invertinginputoftheamplifier.Thispinhasthe
samevoltagerangeas–IN.
OUTOutputTheoutputvoltagerangeextendstowithinmillivolts
ofeachsupplyrail.
NC Noconnection
2.PackageandOrderingInformation
ModelChannelOrderNumber Package PackageOptionMarking
Information
COS22611COS2261TR SOT23-5TapeandReel,3000C2261
COS2261SR SOP-8TapeandReel,3000COS2261
COS22622COS2262SR SOP-8TapeandReel,3000COS2262
COS2262MR MSOP-8TapeandReel,3000COS2262
COS22644COS2264SR SOP-14TapeandReel,3000COS2264
COS2264TR TSSOP-14TapeandReel,3000COS2264
COS2261,COS2262,COS2264
www.cosine-ic.com 33.ProductSpecification
3.1AbsoluteMaximumRatings(1)
Parameter Rating Units
PowerSupply:+Vsto-Vs 16 V
InputVoltage -Vs-0.5Vto+Vs+0.5V V
InputCurrent(2)10 mA
StorageTemperatureRange -65to150 °C
JunctionTemperature 150 °C
OperatingTemperatureRange -40to125 °C
ESDSusceptibility,HBM 2000 V
(1)Stressesexceedingtheabsolutemaximumratingsmaydamagethedevice.Thedevicemaynotfunctionorbeoperable
abovetherecommendedoperatingconditionsandstressingthepartstotheselevelsisnotrecommended.Inaddition,
extendedexposuretostressesabovetherecommendedoperatingconditionsmayaffectdevicereliability.Theabsolute
maximumratingsarestressratingsonly.
(2)Inputterminalsarediode-clampedtothepower-supplyrails.Inputsignalsthatcanswingmorethan0.5Vbeyondthe
supplyrailsshouldbecurrent-limitedto10mAorless.
3.2ThermalData
Parameter Rating Unit
PackageThermalResistance,RθJA
(Juntion-to-ambient)190(SOT23-5)
206(MSOP8)
155(SOP8)
105(TSSOP14)
82(SOP14)°C/W
3.3RecommendedOperatingConditions
Parameter Rating Unit
DCSupplyVoltage 3.3V~16V V
Inputcommon-modevoltagerange -Vs~+Vs V
Operatingambienttemperature -40to+85 °C
COS2261,COS2262,COS2264
www.cosine-ic.com 43.4ElectricalCharacteristics
(+VS=+12V,-VS=0,VCM=VS/2,TA=+25°C,RL=10kΩtoVS/2,unlessotherwisenoted)
Parameter Symbol Conditions MinTypMaxUnit
InputCharacteristics
InputOffsetVoltage VOS ±0.6±5mV
InputOffsetVoltageDrift ΔVOS/ΔT-40to125°C ±2.0 μV/°C
InputBiasCurrent IB ±2.5 pA
InputOffsetCurrent IOS ±2.5 pA
Common-ModeVoltageRangeVCM -0.1 12.1V
Common-ModeRejectionRatioCMRRVCM=0.1Vto15.9V 125 dB
Open-LoopVoltageGain AOLVO=0.2Vto15.8V 120 dB
OutputCharacteristics
OutputVoltageSwingfromRailRL=1MΩ 3 mV
RL=100kΩ 15 mV
RL=10kΩ 120 mV
Short-CircuitCurrentISR Sourcing,VS=12V 30 mA
ISK Sinking,VS=12V 18 mA
PowerSupply
OperatingVoltageRange 3.3 16V
PowerSupplyRejectionRatioPSRRVS=3.5Vto16V 80100 dB
QuiescentCurrent/AmplifierIQVS=12V 100 μA
VS=5V 80 μA
DynamicPerformance
GainBandwidthProduct GBWPG=+1 2.5 MHz
SlewRate SR G=+1,2VOutputStep 0.8 V/μs
NoisePerformance
VoltageNoiseDensity en f=1kHz 57 nV/√Hz
COS2261,COS2262,COS2264
www.cosine-ic.com 54.0ApplicationNotes
DrivingCapacitiveLoads
Drivinglargecapacitiveloadscancausestabilityproblemsforvoltagefeedbackopamps.Asthe
loadcapacitanceincreases,thefeedbackloop’sphasemargindecreases,andtheclosedloop
bandwidthisreduced.Thisproducesgainpeakinginthefrequencyresponse,withovershootand
ringinginthestepresponse.Aunitygainbuffer(G=+1)isthemostsensitivetocapacitiveloads,but
allgainsshowthesamegeneralbehavior.
Whendrivinglargecapacitiveloadswiththeseopamps(e.g.,>100pFwhenG=+1),asmallseries
resistorattheoutput(RISOinFigure1)improvesthefeedbackloop’sphasemargin(stability)by
makingtheoutputloadresistiveathigherfrequencies.Itdoesnot,however,improvethebandwidth.
ToselectRISO,checkthefrequencyresponsepeaking(orstepresponseovershoot)onthebench.If
theresponseisreasonable,youdonotneedRISO.Otherwise,startRISOat1kΩandmodifyitsvalue
untiltheresponseisreasonable.
Figure1.IndirectlyDrivingHeavyCapacitiveLoad
AnimprovementcircuitisshowninFigure2.ItprovidesDCaccuracyaswellasACstability.RF
providestheDCaccuracybyconnectingtheinvertingsignalwiththeoutput,CFandRISOserveto
counteractthelossofphasemarginbyfeedingthehighfrequencycomponentoftheoutputsignal
backtotheamplifier’sinvertinginput,therebypreservingphasemarginintheoverallfeedbackloop.
Figure2.IndirectlyDrivingHeavyCapacitiveLoadwithDCAccuracy
COS2261,COS2262,COS2264
www.cosine-ic.com 6Fornoninvertingconfiguration,therearetwootherswaystoincreasethephasemargin:(a)by
increasingtheamplifier’sgainor(b)byplacingacapacitorinparallelwiththefeedbackresistorto
counteracttheparasiticcapacitanceassociatedwithinvertingnode,asshowninFigure3.
Figure3.AddingaFeedbackCapacitorintheNoninvertingConfiguration
Power-SupplyBypassingandLayout
TheCOS2261/2/4operatesfromasingle+3.3Vto+16Vsupplyordual±1.65Vto±6Vsupplies.For
single-supplyoperation,bypassthepowersupply+Vswitha0.1μFceramiccapacitorwhichshould
beplacedclosetothe+Vspin.Fordual-supplyoperation,boththe+Vsandthe-Vssuppliesshould
bebypassedtogroundwithseparate0.1μFceramiccapacitors.2.2μFtantalumcapacitorcanbe
addedforbetterperformance.
Thelengthofthecurrentpathisdirectlyproportionaltothemagnitudeofparasiticinductancesand
thusthehighfrequencyimpedanceofthepath.Highspeedcurrentsinaninductivegroundreturn
createanunwantedvoltagenoise.Broadgroundplaneareaswillreducetheparasiticinductance.
Thusagroundplanelayerisimportantforhighspeedcircuitdesign.
TypicalApplicationCircuits
DifferentialAmplifier
ThecircuitshowninFigure4performsthedifferentialfunction.Iftheresistorsratiosareequal(R4/
R3=R2/R1),thenVOUT=(VIP–VIN)×R2/R1+VREF.
COS2261,COS2262,COS2264
www.cosine-ic.com 7
Figure4.DifferentialAmplifier
LowPassActiveFilter
Whenreceivinglow-levelsignals,limitingthebandwidthoftheincomingsignalsintothesystemis
oftenrequired.ThesimplestwaytoestablishthislimitedbandwidthistoplaceanRCfilteratthe
noninvertingterminaloftheamplifier.Ifevenmoreattenuationisneeded,amultiplepolefilteris
required.TheSallen-Keyfiltercanbeusedforthistask,asFigure5.Forbestresults,theamplifier
shouldhaveabandwidththatis8to10timesthefilterfrequencybandwidth.Failuretofollowthis
guidelinecanresultinreductionofphasemargin.Thelargevaluesoffeedbackresistorscancouple
withparasiticcapacitanceandcauseundesiredeffectssuchasringingoroscillationinhigh-speed
amplifiers.Keepresistorsvalueaslowaspossibleandconsistentwithoutputloadingconsideration.
Figure5.Two-PoleLow-PassSallen-KeyActiveFilter
COS2261,COS2262,COS2264
www.cosine-ic.com 85.PackageInformation
5.1SOT23-5(PackageOutlineDimensions)
5.2SOP8(PackageOutlineDimensions)

COS2261,COS2262,COS2264
www.cosine-ic.com 95.3MSOP8(PackageOutlineDimensions)
5.4SOP14(PackageOutlineDimensions)

COS2261,COS2262,COS2264
www.cosine-ic.com 105.5TSSOP14(PackageOutlineDimensions)
6.RelatedParts
PartNumber Description
COS6042 24kHz,0.5μA,Nano-PowerOpAmps,1.4Vto5.5VSupply
COS8042 160MHz,5.5mA,HighSpeedOpAmps,3Vto12VSupply
COS2172 10MHz,1.2mA,RRIOOpAmps,4.5to40VSupply
COS2333 350kHz,18μA,PrecisionOpAmps,1.8to5.5VSupply,ZeroDrift,Vos<10μV COS8552 1.5MHz,55μA,PrecisionOpAmps,1.8to5.5VSupply,ZeroDrift,Vos<10μV COS2388 9MHz,570μA,PrecisionOpAmps,1.8to5.5VSupply,ZeroDrift,Vos<10μV COS2227 10MHz,1.3mA,PrecisionOpAmps,4.5to36VSupply,Vos<50μV COS2182 5MHz,580μA,RRIOPrecisionOpAmps,4.5to40VSupply,Vos<50μV COS620 1.5MHz,1.3mA,InstrumentationAmps,4.5to36VSupply,Vos<50μV COSINA333150kHz,65μA,InstrumentationAmps,1.8to5.5VSupply,Vos<25μV