Texas Instruments THS3115 EVM Manuale utente

THS3115/25 EVM

May 2002 HPL

User’sGuide

SLOU126

IMPORTANTNOTICE

TexasInstrumentsIncorporated and its subsidiaries(TI) reservethe right tomakecorrections,modifications,

enhancements,improvements,and otherchangestoitsproductsand servicesatanytime and to discontinue

anyproductorservicewithoutnotice.Customers should obtainthe latestrelevantinformation before placing

ordersandshouldverifythatsuchinformationiscurrentandcomplete.AllproductsaresoldsubjecttoTI’sterms

and conditionsofsalesupplied at the time oforderacknowledgment.

TIwarrantsperformance ofitshardware productstothe specificationsapplicable at the time ofsalein

accordancewithTI’s standardwarranty.Testing and otherquality controltechniquesare used tothe extentTI

deemsnecessarytosupportthiswarranty.Exceptwheremandatedbygovernmentrequirements,testing ofall

parametersofeach productisnotnecessarilyperformed.

TIassumesno liabilityforapplicationsassistance orcustomerproductdesign.Customersareresponsiblefor

theirproductsandapplicationsusingTIcomponents.Tominimizethe risks associated withcustomerproducts

and applications,customers should provide adequate design and operating safeguards.

TIdoesnotwarrantorrepresent thatanylicense,eitherexpressorimplied,isgrantedunderanyTIpatentright,

inwhichTIproductsorservicesareused.InformationpublishedbyTIregardingthird--partyproductsorservices

doesnotconstitutealicensefromTI to usesuch productsorservicesorawarrantyorendorsement thereof.

Useofsuchinformationmayrequirealicensefromathird partyunderthepatentsorotherintellectualproperty

of the third party,oralicensefromTIunderthe patentsorotherintellectualpropertyofTI.

Reproduction ofinformation inTIdata books ordatasheetsispermissible onlyifreproduction iswithout

alteration and isaccompanied byall associated warranties,conditions,limitations,and notices.Reproduction

ofthisinformation withalteration isan unfairand deceptivebusiness practice.TIisnotresponsibleorliablefor

such altered documentation.

ResaleofTIproductsorserviceswithstatementsdifferentfromorbeyond theparameters stated byTI forthat

productorservicevoidsall express and anyimplied warrantiesforthe associated TIproductorservice and

isan unfairand deceptive business practice.TIisnotresponsible orliableforany suchstatements.

Mailing Address:

TexasInstruments

PostOfficeBox655303

Dallas,Texas75265

Copyrightã2002,TexasInstrumentsIncorporated

EVMIMPORTANTNOTICE

TexasInstruments(TI)providesthe enclosed product(s)underthe following conditions:

ThisevaluationkitbeingsoldbyTIisintendedforuseforENGINEERINGDEVELOPMENTOREVALUATION

PURPOSES ONLYandisnotconsidered byTI tobefitforcommercialuse.Assuch, thegoodsbeingprovided

maynotbe completeintermsofrequired design-,marketing-,and/ormanufacturing-related protective

considerations,including productsafetymeasurestypicallyfound inthe end productincorporating the goods.

Asa prototype, thisproductdoesnot fall withinthe scope of the European Union directive on electromagnetic

compatibilityand thereforemaynotmeet the technicalrequirementsof the directive.

ShouldthisevaluationkitnotmeetthespecificationsindicatedintheEVMUser’sGuide,thekitmaybereturned

within 30 days fromthe date ofdeliveryforafull refund.THEFOREGOINGWARRANTYISTHE EXCLUSIVE

WARRANTYMADE BY SELLERTOBUYERAND ISINLIEUOFALL OTHERWARRANTIES,EXPRESSED,

IMPLIED,ORSTATUTORY, INCLUDINGANYWARRANTYOFMERCHANTABILITYORFITNESS FORANY

PARTICULARPURPOSE.

The userassumesall responsibilityand liabilityforproperand safe handling of the goods.Further, the user

indemnifiesTI fromall claimsarising fromthe handling oruse of the goods.Please be awarethat the products

receivedmaynotberegulatorycompliantoragencycertified (FCC,UL,CE,etc.).Duetotheopenconstruction

oftheproduct,itistheuser’sresponsibilitytotakeanyandallappropriateprecautionswithregardtoelectrostatic

discharge.

EXCEPT TOTHE EXTENTOF THEINDEMNITY SET FORTHABOVE,NEITHERPARTY SHALL BE LIABLE

TOTHEOTHERFORANYINDIRECT,SPECIAL, INCIDENTAL,OR CONSEQUENTIALDAMAGES.

TIcurrentlydealswithavarietyofcustomersforproducts,and therefore ourarrangementwiththe userisnot

exclusive.

TIassumesno liabilityforapplicationsassistance,customerproductdesign,softwareperformance,or

infringementofpatentsorservices described herein.

Pleaseread the EVMUser’sGuide and,specifically, the EVMWarningsand Restrictionsnoticeinthe EVM

User’sGuidepriortohandlingtheproduct.Thisnoticecontainsimportantsafetyinformationabouttemperatures

and voltages.Forfurthersafety concerns,pleasecontact the TIapplication engineer.

Personshandling the productmusthave electronics training and observe good laboratorypracticestandards.

Nolicenseisgranted underanypatentrightorotherintellectualpropertyrightofTIcovering or relating to any

machine,process,orcombination inwhichsuchTIproductsorservicesmightbe orare used.

Mailing Address:

TexasInstruments

PostOfficeBox655303

Dallas,Texas75265

Copyrightã2002,TexasInstrumentsIncorporated

EVMWARNINGSAND RESTRICTIONS

It isimportant to operatethisEVMwithinthe specified inputand outputrangesdescribed in

the EVMUser’sGuide.

Exceeding the specified inputrange may cause unexpected operation and/orirreversible

damage tothe EVM. If there are questions concerning the inputrange,pleasecontactaTI

fieldrepresentative priortoconnecting the inputpower.

Applyingloadsoutsideofthespecifiedoutputrangemayresultinunintendedoperationand/or

possible permanentdamage tothe EVM.Pleaseconsult the EVMUser’sGuide priorto

connecting anyload tothe EVMoutput. If thereisuncertaintyastothe load specification,

pleasecontactaTI fieldrepresentative.

Duringnormaloperation,somecircuitcomponentsmayhavecasetemperaturesgreaterthan

60°C.TheEVMisdesignedto operateproperlywithcertaincomponentsabove60°Caslong

astheinputandoutputrangesaremaintained.Thesecomponentsincludebutarenotlimited

tolinearregulators,switchingtransistors,passtransistors,andcurrentsenseresistors.These

typesofdevicescanbeidentifiedusingtheEVMschematiclocatedintheEVMUser’sGuide.

When placing measurementprobesnearthese devicesduring operation,please be aware

that these devicesmaybe verywarmtothe touch.

Mailing Address:

TexasInstruments

PostOfficeBox655303

Dallas,Texas75265

Copyrightã2002,TexasInstrumentsIncorporated

Information AboutCautionsand Warnings

iii

Preface

Read This First

AboutThisManual

Thismanualprovidesinformation about the evaluation module of the current

feedback amplifierundertest. Additionally, thisdocumentprovidesa good ex-

ample ofPCBdesign forhigh-speed applications.The usershouldkeep in

mind the following points.

-The design of the high-speed amplifierPCBisa delicate process.

-The usermustapproachthe PCBdesign withcare and awareness.

-Itisrecommendedthattheuserinitiallyreviewthedatasheetofthedevice

undertest.

-It isalso helpfultoreviewthe schematicand layoutof the THS3115/25

EVMto determine the design techniquesused inthe evaluation board.

-It isrecommended that the user reviewthe application notesCurrent

Feedback AmplifierAnalysisand Compensation,(literature number

SLOA021A)and Voltage Feedback vs CurrentFeedback OpAmps,

(literature numberSLVA051)to gainmoreinsightaboutcurrent feedback

amplifiers.

HowtoUse ThisManual

Thisdocumentcontainsthe following chapters:

-Chapter1—Introduction and Description

-Chapter2—Using the THS3115/25 EVM

-Chapter3—CircuitDesign Examples

-Chapter4—GeneralHigh-Speed AmplifierDesign Considerations

-Chapter5—EVMHardwareDescription

Information AboutCautions and Warnings

Thisbookmay containcautionsand warnings.

Thisis anexampleofa caution statement.

Acaution statementdescribes a situation thatcould potentially

damage yoursoftwareorequipment.

Trademarks

Thisis anexampleofawarning statement.

Awarning statementdescribes a situation thatcould potentially

cause harmtoyou.

The information in a caution orawarning isprovided foryourprotection.

Pleaseread eachcaution and warning carefully.

RelatedDocumentation FromTexas Instruments

TheURL’sbelowarecorrectasofthe dataofpublication ofthismanual.Texas

Instrumentsapplicationsapologizesif they change overtime.

-THS3115/25 datasheet(literature numberSLOS382)

-Application report(literature numberSLOA021A),CurrentFeedback

AmplifierAnalysisand Compensation,

http://www--s.ti.com/sc/psheets/sloa021a/sloa021a.pdf

-Application report(literature numberSLVA051),Voltage Feedback Vs

CurrentFeedback OpAmps,

http://www--s.ti.com/sc/psheets/slva051/slva051.pdf

-Application report(literature numberSLOA069),How(Not)toDecouple

High Speed OpAmpCircuits,

http://www--s.ti.com/sc/psheets/sloa069/sloa069.pdf

-Application report(literature numberSLOA072),SingleSupply

DifferentialOpAmpTechniques,

http://www--s.ti.com/sc/psheets/sloa072/sloa072.pdf

FCC Warning

Thisequipmentisintendedforuseinalaboratorytestenvironmentonly.Itgen-

erates,uses,and canradiateradiofrequency energyand hasnotbeen tested

forcompliancewiththe limitsofcomputing devicespursuant tosubpartJof

part15 ofFCC rules,which are designed to provide reasonable protection

againstradiofrequency interference.Operation of thisequipmentin otheren-

vironmentsmay causeinterferencewithradiocommunications,inwhichcase

the userathisown expensewill be required totakewhatevermeasuresmay

be required tocorrect thisinterference.

Trademarks

PowerPADisatrademarkofTexasInstruments.

Contents

1Introduction and Description 1-1....................................................

1.1Description 1-2................................................................

1.2Evaluation ModuleFeatures1-2.................................................

1.3THS3115/25 EVMOperating Conditions1-2.......................................

1.4EVMDefaultConfiguration 1-2..................................................

2Using theTHS3115/25 EVM2-1......................................................

2.1Required Equipment2-2........................................................

2.2PowerSupplySetup for±15 Vdc2-2.............................................

2.3Inputand OutputSetup forChannel1 2-3.........................................

2.4Operating the EVMon Channel1 2-4............................................

2.5Inputand OutputSetup forChannel2 2-6.........................................

2.6Operating the EVMon Channel2 2-7............................................

3CircuitDesign Examples 3-1........................................................

3.1Inverting Stage (Channel1)Operation 3-2........................................

3.2Noninverting Stage (Channel2)Operation 3-4.....................................

3.3ShutDownOperation (Channels1 and 2)3-4.....................................

4GeneralHigh-SpeedAmplifierDesign Considerations 4-1.............................

5EVMHardwareDescription 5-1......................................................

5.1Bill ofMaterials5-2............................................................

5.2CircuitBoard Layout5-4........................................................

5.3Schematic5-6................................................................

Contents

Figures

1--1Schematicof the Populated Circuiton the EVM(DefaultConfiguration)1-3..............

2--1PowerSupplyConnection for±15 Vdc2-3...........................................

2--2SignalConnectionsforChannel1 2-4...............................................

2--3Oscilloscope Output forChannel1 2-5..............................................

2--4Oscilloscope Output forChannel1WithShutdownActivated 2-5.......................

2--5SignalConnectionsforChannel2 2-6...............................................

2--6Oscilloscope Output forChannel2 2-7..............................................

2--7Oscilloscope Output forChannel2WithShutdownActivated 2-8.......................

3--1Inverting GainStage 3-2..........................................................

3--2Noninverting GainStage 3-4......................................................

5--1Top Layer1(Signals)forTHS3115 EVM5-4.........................................

5--2Bottom(Layer2) (Ground and SIgnal)forTHS3115 EVM5-5..........................

5--3Full Schematicof the EVM5-6.....................................................

Tables

5--1THS3115 EVMBill ofMaterials5-2.................................................

5--2THS3125 EVMBill ofMaterials5-3.................................................

1-1

Introduction and Description

The TexasInstrumentsTHS3115/25 evaluation module(EVM)helps

designersevaluatethe performance of the THS3115/25 current feedback

operationalamplifier (CFA).ThisEVMisalso a good example ofhigh-speed

PCBdesign.

ThisdocumentdetailstheTHS3115/25EVM.ItincludesalistofEVMfeatures,

a briefdescription of the moduleillustrated with a seriesofschematic

diagrams,EVMspecifications,detailson connecting and using the EVM,and

a discussion ofhigh-speed amplifierdesign considerations.

ThisEVMenablestheusertoimplementvariouscircuitstoclarifytheavailable

configurationspresented inthe schematicof the EVM. In addition,when the

customer receivesthe EVM, the schematicof the defaultcircuithasbeen

added to depict the componentsmounted on the EVM.

Othersamplecircuitsare presented foruserimplementation.The userisnot

limited tothe circuitconfigurationspresented inthisuser’sguide.The EVM

providesenough hardware hooks that the onlylimitation isthecreativityof the

user.

TopicPage

1.1Description 1-2...................................................

1.2Evaluation ModuleFeatures 1-2...................................

1.3THS3115/25 EVMOperating Conditions 1-2.........................

1.4EVMDefaultConfiguration 1-2.....................................

Chapter1

Description

1-2

1.1Description

The THS3115/25 EVMprovidesa platformfordeveloping high-speed CFA

application circuits.Itcontainsthe THS3115/25 high-speed CFA,a numberof

passivecomponents,and variousfeaturesand footprintsthatenablethe user

to experiment, test, and verify variousoperationalamplifiercircuit

implementations.The PCboardmeasures3.52 by2.81 inches.

1.2Evaluation ModuleFeatures

THS3115/25 high-speed operationalamplifierEVMfeaturesinclude:

-Wideoperatingsupplyvoltagerange:dualsupply±5to±15Vdcoperation

(see the device datasheet).

-Unitygaininverting stage (channel1 of the IC).The usercan reconfigure

gain asrequired.

-Noninverting stage with a gain of2(channel2 of the IC).The usercan

reconfigure gain asrequired.

-Nominal50-Winputtermination resistors(R2and R8).Termination canbe

configured according tothe application requirement.

-Nominal50-W,1watt outputmatching resistors(R5Band R11B).Foot-

printsare provided forlowerpower resistors(R5Aand R11A).

-100-W,1watt outputload resistors(R6Band R12B).Footprintsare

provided forlowerpower resistors(R6Aand R12A).

-Shutdown(SD)pincontrol,J10

-Powersupplyripplerejection capacitors(C1 and C2)

-Decoupling capacitors(C3,C4)populated with 0.1-mFcapacitors.Design

finaldecoupling in accordancewithSLOA069

-Agood example ofhigh-speed amplifierPCBdesign and layout

1.3THS3115/25 EVMOperating Conditions

-Supply voltage range,±VS ±5Vto±15V(seethedevicedatasheet)

-Supply current, IS(see the device datasheet)

-Outputdrive, IO,atVS =±15 (see the device datasheet)

ForcompleteTHS3115/25 amplifierICspecifications,parameter

measurementinformation,and additionalapplication information,see the

THS3115/25 datasheet, TIliterature numberSLOS382.

1.4EVMDefaultConfiguration

Asdelivered, the EVMhasafullyfunctionalexamplecircuit, justadd power

supplies,asignalsource,and monitoring instrument. See Figure 1--1forthe

defaultschematicdiagram.The usercan change the gain by changing the

ratiosof the feedback and gainresistors(see the device datasheet for

recommended resistorvalues).The completeEVMschematic—showing all

componentlocations—is showninChapter5.

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