TP5089资料

TP5089DTMF(TOUCH-TONE)GeneratorDecember1991

TP5089DTMF(TOUCH-TONE)Generator

GeneralDescription

TheTP5089isalowthresholdvoltage󰀷field-implanted󰀷met-algateCMOSintegratedcircuit󰀟Itinterfacesdirectlytoastandardtelephonekeypadandgeneratesalldualtonemul-ti-frequencypairsrequiredintone-dialingsystems󰀟Thetonesynthesizersarelockedtoanon-chipreferenceoscillatorusinganinexpensive3󰀟579545MHzcrystalforhightoneaccuracy󰀟Thecrystalandanoutputloadresistoraretheonlyexternalcomponentsrequiredfortonegeneration󰀟AMUTEOUTlogicsignal󰀷whichchangesstatewhenanykeyisdepressed󰀷isalsoprovided󰀟

Features

YYYYYYYYY

3󰀟5V–10Voperationwhengeneratingtones2VoperationofkeyscanandMUTElogicStaticsensingofkeyclosuresorlogicinputs

On-chip3󰀟579545MHzcrystal-controlledoscillatorOutputamplitudesproportionaltosupplyvoltageHighgrouppre-emphasisLowharmonicdistortion

Openemitter-followerlow-impedanceoutputSINGLETONEINHIBITpin

BlockDiagram

TL󰁋H󰁋5057–1

FIGURE1

C1995NationalSemiconductorCorporationTL󰁋H󰁋5057RRD-B30M115󰁋PrintedinU󰀟S󰀟A󰀟

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AbsoluteMaximumRatings

IfMilitary󰁋Aerospacespecifieddevicesarerequired󰀷pleasecontacttheNationalSemiconductorSalesOffice󰁋Distributorsforavailabilityandspecifications󰀟SupplyVoltage(VDDbVSS)15VMaximumVoltageatAnyPin

VDDa0󰀟3VtoVSSb0󰀟3V

OperatingTemperatureStorageTemperatureMaximumPowerDissipation

b30󰀄Ctoa60󰀄Cb55󰀄Ctoa150󰀄C

500mW

3󰀟5Vto10V󰀷TAe0󰀄Ctoa60󰀄Cbycorrelationwith100%electricaltestingatTAe25󰀄C󰀟Allotherlimitsareassuredbycorrelationwithotherproductiontestsand󰁋orproductdesignandcharacterization󰀟

Parameter

MinimumSupplyVoltageforKeysenseandMUTELogicFunctionsMinimumOperatingVoltageforgeneratingtonesOperatingCurrentIdle

GeneratingTones

InputResistors

COLUMNandROW(Pull-Up)

SINGLETONEINHIBIT(Pull-Down)TONEDISABLE(Pull-Up)InputLowLevelInputHighLevel

MUTEOUTSinkCurrent(COLUMNandROWActive)MUTEOutLeakageCurrentOutputAmplitudeLowGroup

VDDe3󰀟5VVoe0󰀟5VVoeVDDRLe240XVDDe3󰀟5VRLe240XVDDe10V

OutputAmplitudeHighGroup

RLe240XVDDe3󰀟5VRLe240XVDDe10V

MeanOutputDCOffsetHighGroupPre-Emphasis

DualTone󰁋TotalHarmonicDistortionRatioStart-UpTime(to90%Amplitude)

Note1󰀌RListheexternalloadresistorconnectedfromTONEOUTtoVSS󰀟

Note2󰀌Crystalspecification󰀌Parallelresonant3󰀟579545MHz󰀷RSs150X󰀷Le100mH󰀷COe5pF󰀷CIe0󰀟02pF󰀟

ElectricalCharacteristicsUnlessotherwisenoted󰀷limitsprintedinBOLDcharactersareguaranteedforVDDe

Conditions

Min23󰀝5

MuteopenRLe%VDDe3󰀟5V

25120

21󰀟1

252󰀝5

Typ

Max

UnitsVVmAmA

50

kXkX

0󰀝2VDD

VVmA

0󰀝8VDD0󰀝4

1

190510270735

2507003409551󰀟34󰀟6

2󰀝2

VDDe4V󰀷RLe240X1MHzBandwidth

2󰀟7

b23

mA

3408804701265

mVrmsmVrmsmVrmsmVrmsVV

3󰀝2

b22

VDDe3󰀟5VVDDe10V

dBdBmS

35

2

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ConnectionDiagram

Dual-In-LinePackage

Symbol

MUTEOutput

Description

TheMUTEoutputisanopen-drainN-channeldevicethatsinkscurrenttoVSSwithanykeyinputandisopenwhennokeyinputissensed󰀟TheMUTEoutputwillswitchregardlessofthestateoftheSINGLETONEINHIBITinput󰀟

TheSINGLETONEINHIBITinputisusedtoinhibitthegenerationofotherthanvalidtonepairsduetomultiplerow-columnclosures󰀟Ithasapull-downresistortoVSS󰀷andwhenleftopenortiedtoVSSanyinputconditionthatwould

normallyresultinasingletonewillnowresultinnotone󰀷withallotherfunctionsoperatingnormally󰀟WhentiedtoVDD󰀷singleordualtonesmaybegenerated󰀷seeTableII󰀟ThisoutputistheopenemitterofanNPNtransistor󰀷the

collectorofwhichisconnectedtoVDD󰀟WhenanexternalloadresistorisconnectedfromTONEOUTtoVSS󰀷theoutputvoltageonthispinisthesumofthehighandlowgroupsine-wavessuperimposedonaDCoffset󰀟Whennotgeneratingtones󰀷thisoutputtransistoristurnedOFFtominimizethedeviceidlecurrent󰀟

AdjustmentoftheemitterloadresistorresultsinvariationofthemeanDCcurrentduringtonegeneration󰀷thesinewavesignalcurrentthroughthe

outputtransistor󰀷andtheoutputdistortion󰀟Increasingvaluesofloadresistancedecreaseboththesignalcurrentanddistortion󰀟

SINGLETONEINHIBITInput

TL󰁋H󰁋5057–2

TopView

OrderNumberTP5089NSeeNSPackageN16A

PinDescriptions

SymbolVDD

Description

Thisisthepositivevoltage

supplytothedevice󰀷referencedtoVSS󰀟ThecollectoroftheTONEOUTtransistorisconnectedtothispin󰀟

Thisisthenegativevoltagesupply󰀟Allvoltagesarereferencedtothispin󰀟

Alltonegenerationtimingisderivedfromtheon-chiposcillatorcircuit󰀟Alowcost3󰀟579545MHzA-cutcrystal(NTSCTVcolor-burst)is

neededbetweenpins7and8󰀟Loadcapacitorsandafeedbackresistorareincludedon-chipforgoodstart-upandstability󰀟Theoscillatorstopswhencolumninputsaresensedwithnovalidinputhavingbeendetected󰀟TheoscillatorisalsostoppedwhentheTONEDISABLEinputispulledtologiclow󰀟

Whennokeyispushed󰀷pull-upresistorsareactiveonrowandcolumninputs󰀟Akeyclosureisrecognizedwhenasinglerowandasinglecolumnare

connectedtoVSS󰀷whichstartstheoscillatorandinitiatestonegeneration󰀟Negative-truelogicsignalssimulatingkeyclosurescanalsobeused󰀟

TheTONEDISABLEinputhasaninternalpull-upresistor󰀟Whenthisinputisopenoratlogichigh󰀷thenormaltoneoutputmodewilloccur󰀟WhenTONEDISABLEinputisatlogiclow󰀷thedevicewillbeintheinactivemode󰀷TONEOUTwillbeatanopencircuitstate󰀟

3

TONEOUT

VSS

OSCIN󰀷OSCOUT

FunctionalDescription

Withnokeyinputstothedevicetheoscillatorisinhibited󰀷theoutputtransistorispulledOFFanddevicecurrentcon-sumptionisreducedtoaminimum󰀟Keyclosuresaresensedstatically󰀟AnykeyclosureactivatestheMUTEoutput󰀷startstheoscillatorandsetsthehighgroupandlowgrouppro-grammablecounterstotheappropriatedivideratio󰀟Thesecounterssequencetworatioed-capacitorD󰁋Aconvertersthroughaseriesof28equaldurationstepspersine-wavecycle󰀟Thetwotonesaresummedbyamixeramplifier󰀷withpre-emphasisappliedtothehighgrouptone󰀟TheoutputisanNPNemitter-followerrequiringtheadditionofanexternalloadresistortoVSS󰀟ThisresistorfacilitatesadjustmentofthesignalcurrentflowingfromVDDthroughtheoutputtran-sistor󰀟

Theamplitudeoftheoutputtonesisdirectlyproportionaltothedevicesupplyvoltage󰀟

RowandColumnInputs

TONEDISABLEInput

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FunctionalDescription(Continued)

TABLEI󰀟OutputFrequencyAccuracy

ToneGroupLowGroupfLHighGroupfH

ValidInputR1R2R3R4C1C2C3C4

StandardDTMF(Hz)

6977708529411209133614771633

ToneOutputFrequency

694󰀟8770󰀟1852󰀟4940󰀟01206󰀟01331󰀟71486󰀟51639󰀟0

%DeviationfromStandard

b0󰀟32a0󰀟02a0󰀟03b0󰀟11b0󰀟24b0󰀟32a0󰀟64a0󰀟37

TABLEII󰀟FunctionalTruthTable

SINGLETONEINHIBITXXXX111000

Note1󰀌Xisdon’tcarestate󰀟

Note2󰀌VOSistheoutputoffsetvoltage󰀟

TONEDISABLEOX01111111

ROWO󰁋CO󰁋COneOne2orMoreOne2orMore2orMoreOne2orMore

COLUMNO󰁋CO󰁋COneOneOne2orMore2orMoreOne2orMore2orMore

TONEOUTLow0V0VVOSfL󰁚fLVOSVOSVOSVOS

High0V0VVOSfHfH󰁚VOSVOSVOSVOS

MUTEO󰁋CO󰁋COOOOOOOO

TL󰁋H󰁋5057–3

󰀂AdjustREfordesiredtoneamplitude󰀟

FIGURE2󰀟TypicalApplication

4

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5

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TP5089DTMF(TOUCH-TONE)GeneratorPhysicalDimensionsinches(millimeters)

Lit󰀟󰀃113986

MoldedDual-In-LinePackage(N)

OrderNumberTP5089NNSPackageN16A

LIFESUPPORTPOLICY

NATIONAL’SPRODUCTSARENOTAUTHORIZEDFORUSEASCRITICALCOMPONENTSINLIFESUPPORTDEVICESORSYSTEMSWITHOUTTHEEXPRESSWRITTENAPPROVALOFTHEPRESIDENTOFNATIONALSEMICONDUCTORCORPORATION󰀟Asusedherein󰀌1󰀟Lifesupportdevicesorsystemsaredevicesorsystemswhich󰀷(a)areintendedforsurgicalimplantintothebody󰀷or(b)supportorsustainlife󰀷andwhosefailuretoperform󰀷whenproperlyusedinaccordancewithinstructionsforuseprovidedinthelabeling󰀷canbereasonablyexpectedtoresultinasignificantinjurytotheuser󰀟

NationalSemiconductorCorporation1111WestBardinRoad2󰀟Acriticalcomponentisanycomponentofalifesupportdeviceorsystemwhosefailuretoperformcanbereasonablyexpectedtocausethefailureofthelifesupportdeviceorsystem󰀷ortoaffectitssafetyoreffectiveness󰀟

NationalSemiconductorEuropeFax󰀌(a49)0-180-5308586NationalSemiconductorHongKongLtd󰀟13thFloor󰀷StraightBlock󰀷NationalSemiconductorJapanLtd󰀟Tel󰀌81-043-299-2309