LM9044 Lambda Sensor Interface Amplifier (Rev. D)
Document overview
- Manufacturer or author: Texas Instruments, Incorporated [SNOSBP4,D]
- PDF pages: 14
Technical content
175 k: 200:0.01 PF 0.01 PF 100: 100: 0.01 PF GND VOUT VREFVCC +V IN 10 k: 0.01 PF -VIN 0.01 PF +9.0V to +16.0V +4.75V to +5.50V LM9044V VS R F AV = 1 AV = 4.5 R DIFF RICH LEAN 800 mV - 450 mV - 100 mV - LM9044 www.ti.com SNOSBP4D –FEBRUARY 1995–REVISED MARCH 2013 LM9044LambdaSensorInterfaceAmplifier Check forSamples: LM9044 1FEATURES DESCRIPTION The LM9044 is a precisiondifferentialamplifier 2• Normal CircuitOperationSpecifiedwithInputs specificallydesignedforoperationinthe automotiveup to3V Below Ground on a SingleSupply. environment.Gain accuracy is specifiedover the• Gain FactoryTrimmed and Specifiedover entireautomotive temperature range (−40°C to Temperature (±3% ofFull-scalefrom −40°C to +125°C) and is factorytrimmed afterpackage +125°C) assembly.The inputcircuitryhas been specifically designedtorejectcommon-mode signalsas much as• Low Power Consumption (Typically1 mA) 3V below ground withoutthe need fora negative• FullyProtectedInputs voltagesupply.This facilitatesthe use of sensors
- InputOpen CircuitDetection which are grounded at the engine blockwhilethe LM9044 itselfis grounded at chassispotential.An• OperationSpecifiedover theEntire externalcapacitoron the R F pin setsthe maximumAutomotive Temperature Range (−40°C to operatingfrequencyof the amplifier,therebyfiltering+125°C) highfrequencytransients.Both inputsare protected againstaccidentalshortingtothebatteryand against load dump transients.The input impedance is typically1.2M Ω. The outputop amp iscapableof drivingcapacitive loadsand isfullyprotected.Also,internalcircuitryhas been providedto detectopen circuitconditionson eitherorbothinputsand forcetheoutputtoa “home ” position(aratiooftheexternalreferencevoltage). TypicalApplication Pleasebe aware thatan importantnoticeconcerningavailability,standardwarranty,and use incriticalapplicationsof Texas Instrumentssemiconductorproductsand disclaimerstheretoappearsattheend ofthisdatasheet. 2Alltrademarksarethepropertyoftheirrespectiveowners. PRODUCTION DATA informationiscurrentas ofpublicationdate. Copyright© 1995–2013,Texas InstrumentsIncorporatedProductsconform to specificationsper the terms of the Texas Instrumentsstandardwarranty.Productionprocessingdoes not necessarilyincludetestingofallparameters.
SNOSBP4D –FEBRUARY 1995–REVISED MARCH 2013 www.ti.com Connection Diagram *Pins1,3,4,6,8,9,10,11,13,14,16,18,19 aretrimpinsand shouldbe leftfloating. Figure1. Top View See Package Number FN0020A
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www.ti.com SNOSBP4D –FEBRUARY 1995–REVISED MARCH 2013 These deviceshave limitedbuilt-inESD protection.The leadsshouldbe shortedtogetherorthedeviceplacedinconductivefoam duringstorageorhandlingtopreventelectrostaticdamage totheMOS gates. ABSOLUTE MAXIMUM RATINGS (1)(2) VCC SupplyVoltage(RVCC = 15 kΩ) ±60V VREF SupplyVoltage −0.3Vto+6V DC InputVoltage(Eitherinput)(3) −3V to+16V InputTransients(4) ±60V Power Dissipationsee (5) 1350 mW OutputShortCircuitDuration Indefinite OperatingTemperatureRange −40°C to+125°C StorageTemperatureRange −65°C to+150°C SolderingInformation Vapor Phase (60seconds) 215°C Infrared(15seconds) 220°C See http://www.ti.comforothermethods ofsolderingsurfacemount devices. (1) AbsoluteMaximum Ratingsindicatelimitsbeyond whichdamage tothedevicemay occur. (2) IfMilitary/Aerospacespecifieddevicesarerequired,pleasecontacttheTexas InstrumentsSalesOffice/Distributorsforavailabilityand specifications. (3) Witha 100Ω seriesresistoron each inputpin. (4) Thistestisperformedwitha 1000Ω sourceimpedance. (5) Foroperationinambienttemperaturesabove 25°C thedevicemust be deratedbased on a maximum junctiontemperatureof150°C and a thermalresistanceof93°C/W junctiontoambient.
ELECTRICAL CHARACTERISTICS
VCC = 12V,VREF = 5V,−40°C ≤ TA ≤ 125°C unlessotherwisenoted (1) (2) Parameter Conditions Units Min Typ Max Min Typ Max DifferentialVoltageGain 0 ≤ VDIFF ≤ 1V,−1V ≤ VCM ≤ +1V −2 0 2 - - - %/FS Gain Error(3) 0 ≤ VDIFF ≤ 1V,−3 ≤ VCM ≤ +1V - - - −3 0 3 %/FS 0 ≤ VDIFF ≤ 1V,−1V ≤ VCM ≤ +1V 0.95 1.20 3.00 - - - M Ω DifferentialInputResistance 0 ≤ VDIFF ≤ 1V,−3 ≤ VCM ≤ +1V - - - 0.70 1.20 4.00 M Ω Non-InvertingInputBiasCurrent InvertingInputBiasCurrent VCC SupplyCurrent VCC = 12V,RV CC = 15k - 300 500 - - - µA VREF SupplyCurrent 4.75V≤ VREF ≤ 5.5V - 0.5 1.0 - - - mA Common-Mode VoltageRange (4) −1 - 1 −3 - 1 V InputReferred DC Common-Mode RejectionRatio −1V ≤ VCM ≤ +1V, VDIFF = 0.5V 50 60 - - - - dB One orBothInputsOpen Open CircuitOutputVoltage −1V ≤ VCM ≤ +1V 0.371 0.397 0.423 - - - xVREF −3V ≤ VCM ≤ +1V - - - 0.365 0.397 0.439 xVREF ShortCircuitOutputCurrent OutputGrounded 1.0 2.7 5.0 - - - mA (1) These parametersarespecifiedand 100% productiontested. (2) These parameterswillbe specifiedbutnot100% productiontested. (3) Gain errorisgivenas a percentoffull-scale.Full-scaleisdefinedas 1V attheinputand 4.5Vattheoutput. (4) The LM9044 has been designedtocommon-mode to−3V,butproductiontestingisonlyperformedat±1V. Copyright© 1995–2013,Texas InstrumentsIncorporated SubmitDocumentationFeedback 3 ProductFolderLinks:LM9044
SNOSBP4D –FEBRUARY 1995–REVISED MARCH 2013 www.ti.com ELECTRICAL CHARACTERISTICS (continued) VCC = 12V,VREF = 5V,−40°C ≤ TA ≤ 125°C unlessotherwisenoted (1) (2) Parameter Conditions Units Min Typ Max Min Typ Max VCC = 12V,RV CC = 15kVCC Power SupplyRejectionRatio 50 65 - - - - dBVDIFF = 0.5V VREF = 5 VDCVREF Power SupplyRejectionRatio 60 74 - - - - dBVDIFF = 0.5V
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www.ti.com SNOSBP4D –FEBRUARY 1995–REVISED MARCH 2013 TYPICAL PERFORMANCE CHARACTERISTICS Non-InvertingInputBias Current InvertingInputBias Current vs vs Temperature Temperature Figure2. Figure3. VREF Supply Currentvs VCC Supply Currentvs Temperature Temperature Figure4. Figure5. ShortCircuitOutput Current vs DifferentialGain vs Temperature Temperature Figure6. Figure7. Copyright© 1995–2013,Texas InstrumentsIncorporated SubmitDocumentationFeedback 5 ProductFolderLinks:LM9044
SNOSBP4D –FEBRUARY 1995–REVISED MARCH 2013 www.ti.com TYPICAL PERFORMANCE CHARACTERISTICS (continued) VoltageGain CMRR vs vs Frequency Frequency Figure8. Figure9. VREF Power Supply Rejection VCC Power Supply Rejection Figure10. Figure11.
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65 PA 380 nA
175 k: 200: GND VOUT VREFVCC +VIN -VIN LM9044V R F 7.5V AV=1 Open -VIN Detector 1.5V R DIFF 1.2 M: 14 k: 4 k: 26.5 k: 220 k: AV=4.5 LM9044 www.ti.com SNOSBP4D –FEBRUARY 1995–REVISED MARCH 2013 TEST CIRCUIT Block Diagram Copyright© 1995–2013,Texas InstrumentsIncorporated SubmitDocumentationFeedback 7 ProductFolderLinks:LM9044
SNOSBP4D –FEBRUARY 1995–REVISED MARCH 2013 www.ti.com
APPLICATION INFORMATION
The LM9044 isa singlechanneldeviceintendedtoactas a linearinterfacebetween a zirconiumdioxideoxygen sensorand an A-to-Dconvertor.The LM9044 isfabricatedinBipolartechnologyand requirestwo supplies:a nominal12V automotivesupply(i.e.VBATTERY ),and a wellregulated5V supply. The IC consistsofa singlechanneldifferentialinputamplifierwitha nominalDC gainof4.5V/V.The differential inputshave a specifiedcommon mode voltageoperatingrangeof1V above and below ground.The circuitryalso containsprovisionsfordefaultoutputvoltageinthe cases of coldsensorand open sensorwiring.Additional supportcircuitryincludesone pinforan optionaluserprogrammed lowpass filter. COLD SENSOR Typically,a Lambda sensorwillhave an impedance oflessthan10 kΩ when operatingattemperaturesbetween 300°C, and 500°C. When a Lambda sensorisnotatoperatingtemperature,itsimpedance can be more than10 Meg Ω.Any voltagesignalthatmay be developedisseriouslyattenuated.Duringthishighimpedance condition theLM9044 willprovidea defaultoutputvoltage. WhiletheLambda sensorishighimpedance theinternalnon-invertinginputbiascurrent(380nA typical)willflow throughthedifferentialinputresistance(1.2M Ω typical)and outtheinvertinginputpintoground.Thiswillcause a voltagetobe developedacrossthedifferentialinputs: VIN(DIFF)= 380 nA x 1.2M Ω VIN(DIFF)= 456 mV The 456 mV acrossdifferentialinputresistancewillbe thedominantinputsignal,and thetypicalVOUT willbe: VOUT = VIN(DIFF)x 4.50 VOUT = 456 mV x 4.50 VOUT = 2.0V As theLambda sensorisheated,and thesensorimpedance beginstodrop,thevoltagesignalfromthesensor willbecome thedominatesignal. The non-invertinginputbiascurrentisscaledtotheVREF voltage.As theVREF voltageincreases,ordecreases, thisbiascurrentwillchange proportionally. OPEN INPUT PINS DEFAULTS In any remote sensor applicationitisdesirableto be able to deal withthe possibilityof open connections between thesensorand thecontrolmodule.The LM9044 iscapableofprovidinga defaultoutputvoltageshould either,or both,of the wiresto the Lambda sensor open. The two inputshandle the open circuitcondition differently. For thecase ofan open connectionatthenon-invertinginput,thedevicewould reactexactlythesame as forthe Cold Sensor condition.The internalnon-invertinginputbias current(380 nA typical)flowingthroughthe differentialinputresistance(1.2M Ω typical)wouldcause thetypicaloutputvoltagetobe ata valuedefinedby: VOUT = ((380nA x 1.2MΩ)x 4.50) VOUT = 2.0V The invertinginputwould stillbe connectedtotheLambda sensorground,so common mode signalswould still need tobe consideredinthiscondition. For thecase ofan open connectionoftheinvertinginput,thedeviceoutputstageswitchesfrom theamplifier outputtoa resistivevoltagedivider.The LM9044 has a comparatortomonitorthevoltageon theinvertinginput pin,and a 65 μA (typical)currentsourcethatwillforcethepinhighifthepinisopen.When thevoltageon the invertingpingoes above typically1.5V,thecomparatorwillswitchtheoutputpinfromtheamplifieroutputtothe resistivevoltagedividerstage.Inthiscase,thedefaultVOUT isnotdependenton thegainstage,and any signal on thenon-invertinginputwillbe ignored.
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www.ti.com SNOSBP4D –FEBRUARY 1995–REVISED MARCH 2013 InthisconditionVOUT is: VOUT = VREF x ((14k+ 4k)/(26.5k+ 14k + 4k)) VOUT = VREF x 0.4045 When VREF isat5.0V,VOUT isdefinedas: VOUT = 5.0Vx 0.4045 VOUT = 2.0V Inthecases where boththeinvertingand non-invertingpinsare open,theopen invertingpincondition(i.e.:a voltagedivideracrosstheoutput)willbe thedominantcondition. Any common mode voltagetransienton theinvertinginputpinwhich goes above thecomparatorthresholdwill immediatelycause the outputto switchto the resistivevoltagedividermode. The outputwillreturnto normal operationwhen thevoltageon theinvertinginputfallsbelowthe1.5Vthreshold. OUTPUT RESISTANCE Under normaloperatingconditionstheoutputpinresistanceistypically200Ω. IftheLM9044 isoperatingina defaultoutputmode due an open connectionon theinvertinginput,theoutput resistancewilltypicallyappeartobe closeto11 kΩ. An externaloutputfiltercapacitorvalueofno more than0.01μF isgenerallyrecommended. Sincetheoutputpin voltagedriveisbasicallya simpleNPN emitterfollower,theoutputpinpull-downisdone by theinternalfeedback resistorstring.Withlargervaluecapacitorson theoutputpintheeffectwillbe somewhat similartoa voltagepeak detectorwhere theoutputcapacitorischargedthroughthe200Ω resistor,and dischargedback throughthe200Ω resistorand the18 kΩ feedbackresistorstringtoground. The outputresistanceprovidescurrentlimitingfortheoutputstageshoulditbecome shortedtoGround.Any DC loadingoftheoutputwillcause an errorintheoutputvoltage. SUPPLY BYPASSING For bestperformancetheLM9044 requiresa VREF supplywhichisstableand noisefree.The same 5V reference supplyused fortheA/D converteristherecommended LM9044 VREF supply. The LM9044 VCC pinhas an internalzenershuntvoltageregulator,typically7.5V,and requiresa seriesresistor tolimitthecurrent.The VCC pinshouldbe bypassed witha minimum 0.01μF capacitortotheGround pin,and shouldbe locatedas closeto the deviceas possible.Some applicationsmay requirean additionalbypass capacitanceifthesystemvoltageisunusuallynoisy. SETTING THE BANDWIDTH The LM9044 bandwidthislimitedby an externalcapacitor(CF)on theR F pin. Thispinhas an internal175 kΩ resistor.The externalcapacitorand theinternalresistorforma simpleRC low- pass filterwitha cornerfrequency(fC )definedas: fC = 1/(2x π x 175 kΩ x C F) Witha C F capacitorvalueof0.001μF,thecornerfrequencyis: fC = 1/(2x π x 175 kΩ x 0.001μF) fC = 909 Hz INPUT FILTERING Filteringatthedifferentialinputsisstronglyrecommended. Both thedifferentialvoltagesignaland thecommon mode voltagesignalshouldhave lowpass filters. Inputfilteringisaccomplishedwithseriesresistorson theinputpins,and appropriatebypass capacitors.Typical inputpinseriesresistancevaluesare inthe100Ω to1kΩ range.Seriesresistancevalueslargerthan1kΩ will generateoffsetvoltagesthataffecttheaccuracyofthesignalvoltageseen atthedifferentialinputpins. Copyright© 1995–2013,Texas InstrumentsIncorporated SubmitDocumentationFeedback 9 ProductFolderLinks:LM9044
SNOSBP4D –FEBRUARY 1995–REVISED MARCH 2013 www.ti.com SimplifiedInternalSchematic
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www.ti.com SNOSBP4D –FEBRUARY 1995–REVISED MARCH 2013
REVISION HISTORY
Changes from RevisionC (March 2013)toRevisionD Page Copyright© 1995–2013,Texas InstrumentsIncorporated SubmitDocumentationFeedback 11 ProductFolderLinks:LM9044
www.ti.com 7-Oct-2013 Addendum-Page 1 PACKAGING INFORMATION Orderable Device Status (1) Package Type Package Drawing Pins Package Qty Eco Plan (2) Lead/Ball Finish MSL Peak Temp (3) Op Temp (°C) Device Marking (4/5) Samples LM9044V/NOPB ACTIVE PLCC FN 20 40 Green (RoHS & no Sb/Br) CU SN Level-2A-250C-4 WEEK -40 to 125 LM9044V LM9044VX/NOPB ACTIVE PLCC FN 20 1000 Green (RoHS & no Sb/Br) CU SN Level-2A-250C-4 WEEK -40 to 125 LM9044V (1) The marketing status values are defined as follows: ACTIVE: Product device recommended for new designs. LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect. NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design. PREVIEW: Device has been announced but is not in production. Samples may or may not be available. OBSOLETE: TI has discontinued the production of the device. (2) Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check http://www.ti.com/productcontent for the latest availability information and additional product content details. TBD: The Pb-Free/Green conversion plan has not been defined. Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements for all 6 substances, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes. Pb-Free (RoHS Exempt): This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and package, or 2) lead-based die adhesive used between the die and leadframe. The component is otherwise considered Pb-Free (RoHS compatible) as defined above. Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame retardants (Br or Sb do not exceed 0.1% by weight in homogeneous material) (3) MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature. (4) There may be additional marking, which relates to the logo, the lot trace code information, or the environmental category on the device. (5) Multiple Device Markings will be inside parentheses. Only one Device Marking contained in parentheses and separated by a "~" will appear on a device. If a line is indented then it is a continuation of the previous line and the two combined represent the entire Device Marking for that device. Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals. TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release. In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI to Customer on an annual basis.
MPLC004A – OCTOBER 1994 1POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 FN (S-PQCC-J**) PLASTIC J-LEADED CHIP CARRIER 4040005/B 03/95
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0.026 (0,66) 0.032 (0,81) D2/E2 0.020 (0,51) MIN 0.180 (4,57) MAX 0.120 (3,05) 0.090 (2,29) D2/E2 0.013 (0,33) 0.021 (0,53) Seating Plane MAX D2/E2 0.219 (5,56) 0.169 (4,29) 0.319 (8,10) 0.469 (11,91) 0.569 (14,45) 0.369 (9,37) MAX 0.356 (9,04) 0.456 (11,58) 0.656 (16,66) 0.008 (0,20) NOM 1.158 (29,41) 0.958 (24,33) 0.756 (19,20) 0.191 (4,85) 0.141 (3,58) MIN 0.441 (11,20) 0.541 (13,74) 0.291 (7,39) 0.341 (8,66) D E1E MINMAXMIN PINS 0.385 (9,78) 0.485 (12,32) 0.685 (17,40) 84 1.185 (30,10) 0.985 (25,02) 0.785 (19,94) D/E 0.395 (10,03) 0.495 (12,57) 1.195 (30,35) 0.995 (25,27) 0.695 (17,65) 0.795 (20,19) NO. OF D1/E1 0.350 (8,89) 0.450 (11,43) 1.150 (29,21) 0.950 (24,13) 0.650 (16,51) 0.750 (19,05) 0.004 (0,10) M0.007 (0,18) 0.050 (1,27) NOTES: A. All linear dimensions are in inches (millimeters). B. This drawing is subject to change without notice. C. Falls within JEDEC MS-018
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