COS2172MRA

COS172,COS2172,COS4172
www.cosine-ic.com 1Features
■Operateson
Single-Supply:4.5V~40V,or
Dual-Supply:±2.25V~±20V
■LowQuiescentCurrent:1.2mA
■GainBandwidthProduct:10MHz
■Rail-to-RailInputandOutput(RRIO)
■5.0V/µsSlewRate
■Lowoffsetdrift:±0.3μV/°C(Typical)
■UnityGainStable
■NoPhaseReversal
■RFIFilteredInputs
■Low-inputBiascurrent:10pA
■ExtendedTemperatureRanges
From-40°Cto+125°C
■SmallPackaging
COS172availableinSOT23-5/SOP-8
COS2172availableinSOP-8/MSOP-8
COS4172availableinSOP14/TSSOP14
Applications
■AutomotiveElectronics
■SensorConditioning
■AGCControl
■TrackingAmplifierinPowerModules
■Battery-PoweredInstruments
■TestEquipmentGeneralDescription
TheCOS172(single),COS2172(dual)and
COS4172(quad)aresinglesupply,rail-to-rail
inputandoutputamplifiersoperatedon
4.5V(±2.25V)to40V(±20V)supplies.Despite
theirlowquiescentcurrent,theCOSx172
familyprovidesexcellentoverallperformance
andversatility.
COSx172familyisunitygainstableandhasa
gainbandwidthproductof10MHz(typical).
TheyprovidehighCMRRandPSRR
performanceandcanoperatefromasingle
supplyordualsupply.Inputsignalscango
beyondthesupplyrailsanddonotcause
phasereversal.Theoutputvoltageswing
extendstowithin150mVofeachrail,providing
themaximumoutputdynamicrangewith
excellentoverdriverecovery.Thesefeatures
maketheCOSx172familywellsuitedfor
single-supply,battery-poweredapplications.
Theycanbeusedasplus-inreplacementsfor
manycommerciallyavailableop-ampsto
reducepowerandimproveinput/outputrange
andperformance.
Rev1.1
Copyright@2018CosineNanoelectronicsInc.Allrightsreserved
Theinformationprovidedhereisbelievedtobeaccurateandreliable.CosineNanoelectronicsassumes
noreliabilityforinaccuraciesandomissions.Specificationsdescribedandcontainedherearesubjected
tochangewithoutnoticeonthepurposeofimprovingthedesignandperformance.Allofthisinformation
describedhereinshouldnotbeimpliedorgrantedforanythirdparty.40V,10MHz,Rail-to-RailInput/Output
SingleSupplyOperationalAmplifiers
COS172,COS2172,COS4172
www.cosine-ic.com 21.PinConfigurationandFunctions
COS172 COS172 COS2172 COS4172
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 Nointernalconnection,canbeleftfloating
2.PackageandOrderingInformation
ModelChannelOrderNumber Package PackageOptionMarking
Information
COS1721COS172TRA
SOT23-5TapeandReel,3000COS172
COS172TRB COS172
COS172SRA
SOP-8TapeandReel,4000COS172SR
COS172SRB COS172SR
COS21722COS2172SRA
SOP-8TapeandReel,4000COS2172SR
COS2172SRB COS2172SR
COS2172MRA
MSOP-8TapeandReel,3000COS2172MR
COS2172MRB COS2172MR
COS172,COS2172,COS4172
www.cosine-ic.com 3COS41724COS4172SR SOP-14TapeandReel,2500COS4172SR
COS4172TR TSSOP-14TapeandReel,3000COS4172TR
3.ProductSpecification
3.1AbsoluteMaximumRatings(1)
Parameter Rating Units
PowerSupply:+Vsto-Vs 42 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 4.5(±2.25)~40(±20) V
Inputcommon-modevoltagerange -Vs~+Vs V
Operatingambienttemperature -40to+85 °C
COS172,COS2172,COS4172
www.cosine-ic.com 43.4ElectricalCharacteristics
(VS=4.5to40V,VCM=VOUT=VS/2,TA=+25°C,RL=10kΩtoVS/2,unlessotherwisenoted)
Parameter Symbol Conditions MinTypMaxUnit
InputCharacteristics
InputOffsetVoltage VOSCOS172A,COS2172A ±0.3±2.0
mV
COS172B,COS2172B ±0.75±5.0
InputOffsetVoltageDrift ΔVOS/ΔT-40to125°C ±0.3±3.0μV/°C
InputBiasCurrent IB ±10 pA
InputOffsetCurrent IOS ±4 pA
Common-ModeVoltageRangeVCM VS=40VV-S
-0.1V+S
-2V
Common-ModeRejectionRatioCMRRV-S-0.1100pFwhenG=+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
COS172,COS2172,COS4172
www.cosine-ic.com 6Fornon-invertingconfiguration,therearetwootherswaystoincreasethephasemargin:(a)by
increasingtheamplifier’sgainor(b)byplacingacapacitorinparallelwiththefeedbackresistorto
counteracttheparasiticcapacitanceassociatedwithinvertingnode,asshowninFigure3.
Figure3.AddingaFeedbackCapacitorintheNoninvertingConfiguration
Power-SupplyBypassingandLayout
TheCOSx172familyoperatesfromasingle+4.5Vto+40Vsupplyordual±2.25Vto±20Vsupplies.
Forsingle-supplyoperation,bypassthepowersupply+Vswitha0.1μFceramiccapacitorwhich
shouldbeplacedclosetothe+Vspin.Fordual-supplyoperation,boththe+Vsandthe-Vssupplies
shouldbebypassedtogroundwithseparate0.1μFceramiccapacitors.2.2μFtantalumcapacitorcan
beaddedforbetterperformance.
Thelengthofthecurrentpathisdirectlyproportionaltothemagnitudeofparasiticinductancesand
thusthehighfrequencyimpedanceofthepath.Highspeedcurrentsinaninductivegroundreturn
createanunwantedvoltagenoise.Broadgroundplaneareaswillreducetheparasiticinductance.
Thusagroundplanelayerisimportantforhighspeedcircuitdesign.
TypicalApplicationCircuits
DifferentialAmplifier
ThecircuitshowninFigure4performsthedifferentialfunction.Iftheresistorsratiosareequal(R4/
R3=R2/R1),thenVOUT=(VIP–VIN)×R2/R1+VREF.
COS172,COS2172,COS4172
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
COS172,COS2172,COS4172
www.cosine-ic.com 85.PackageInformation
5.1SOT23-5(PackageOutlineDimensions)
5.2SOP8(PackageOutlineDimensions)

COS172,COS2172,COS4172
www.cosine-ic.com 95.3MSOP8(PackageOutlineDimensions)
5.4SOP14(PackageOutlineDimensions)

COS172,COS2172,COS4172
www.cosine-ic.com 105.5TSSOP14(PackageOutlineDimensions)
6.RelatedParts
PartNumber Description
COS6041/2/4 24kHz,0.5μA,RRIOOpAmps,1.8to5.5VSupply
COS1347/2347/4347350kHz,15μA,RRIOOpAmps,1.8to5.5VSupply
COS6001/2/4 1.5MHz,50μA,RRIOOpAmps,1.8to5.5VSupply
COS1314/2314/43143MHz,150μA,RRIOOpAmps,1.8to5.5VSupply
COS821/2/4 5MHz,300μA,RRIOOpAmps,1.8to5.5VSupply
COS1374/2374/43747MHz,500μA,RRIOOpAmps,1.8to5.5VSupply
COS721/2/4 10MHz,650μA,RRIOOpAmps,2.1to5.5VSupply
COS1333/2333/43330.35MHz,18μA,RRIOOpAmps,1.8to5.5VSupply,ZeroDrift,Vos<20μV COS8551/2/4 1.5MHz,55μA,RRIOOpAmps,1.8to5.5VSupply,ZeroDrift,Vos<10μV