TFA9890A-SDS-Audio-amplifier

1.GeneraldescriptionTheTFA9890Aisahighefficiencyclass-Daudioamplifierwithasophisticatedspeakerboostandprotectionalgorithm.Itcandeliver7.2Wpeakoutputpowerintoan8speakeratasupplyvoltageof3.6V.Theinternalboostconverterraisesthesupplyvoltageto9.5V,providingampleheadroomformajorimprovementsinsoundquality.Asafeworkingenvironmentisprovidedforthespeakerunderalloperatingconditions.TheTFA9890Amaximizesacousticoutputwhileensuringdiaphragmdisplacementandvoicecoiltemperaturedonotexceedtheirratedlimits.Thisfunctionisbasedonaspeakerboxmodelthatoperatesinallloudspeakerenvironments(e.g.freeair,closedboxorventedbox).Furthermore,advancedsignalprocessingensuresthatthequalityoftheaudiosignalisneverdegradedbyunwantedclippingordistortionintheamplifierorspeaker.Unlikecompetingsolutions,theadaptivesoundmaximizeralgorithmusesfeedbacktoaccuratelycalculateboththetemperatureandtheexcursion,allowingtheTFA9890Atoadapttochangesintheacousticenvironment.InternalintelligentDC-to-DCconversionbooststhesupplyrailtoprovideadditionalheadroomandpoweroutput.Thesupplyvoltageisonlyraisedwhennecessary.Thismaximizestheoutputpoweroftheclass-Daudioamplifierwhilelimitingquiescentpowerconsumption.TheTFA9890Aalsoincorporatesadvancedbatteryprotection.Bylimitingthesupplycurrentwhenthebatteryvoltageislow,itpreventstheaudiosystemfromdrawingexcessiveloadcurrentsfromthebattery,whichcouldcauseasystemundervoltage.Theadvancedprocessorminimizestheimpactofafallingbatteryvoltageontheaudioqualitybypreventingdistortionasthebatterydischarges.ThedevicefeatureslowRFsusceptibilitybecauseithasadigitalinputinterfacethatisinsensitivetoclockjitter.Thesecondorderclosedlooparchitectureusedinaclass-Daudioamplifierprovidesexcellentaudioperformanceandhighsupplyvoltageripplerejection.TheaudioinputinterfaceisI2SandthecontrolsettingsarecommunicatedviaanI2C-businterface.ThedevicealsoprovidesthespeakerwithrobustprotectionagainstESDdamage.Inatypicalapplication,noadditionalcomponentsareneededtowithstanda15kVdischargeonthespeaker.TheTFA9890Aisavailableina49-bumpWLCSP(WaferLevelChip-SizePackage)witha400mpitch.TFA9890A9.5VboostedaudiosystemwithadaptivesoundmaximizerandspeakerprotectionRev.1—16September2014ProductshortdatasheetTFA9890A_SDSAllinformationprovidedinthisdocumentissubjecttolegaldisclaimers.©NXPSemiconductorsN.V.2014.Allrightsreserved.ProductshortdatasheetRev.1—16September20142of38NXPSemiconductorsTFA9890A9.5Vboostedaudiosystemwithadaptivesoundmaximizerandspeakerprotection2.FeaturesandbenefitsSophisticatedspeaker-boostandprotectionalgorithmthatmaximizesspeakerperformancewhileprotectingthespeaker:Fullyembeddedsoftware,noadditionallicensefeeorportingrequiredTotalintegratedsolutionthatincludesDSP,amplifier,DC-to-DC,sensingandmoreAdaptiveexcursioncontrol-guaranteesthatthespeakermembraneexcursionneverexceedsitsratedlimitReal-timetemperatureprotection-directmeasurementensuresthatvoicecoiltemperatureneverexceedsitsratedlimitEnvironmentallyaware-automaticallyadaptsspeakerparameterstoacousticandthermalchangesincludingcompensationforspeaker-boxleakageSpeakererrordetection(detectsfaultyspeakersandenclosures)Outputpower:3.6W(RMS)into8at3.6Vsupplyvoltage(THD=1%)Clipavoidance-DSPalgorithmpreventsclippingevenwithsaggingsupplyvoltageBandwidthextensionoptiontoincreaselowfrequencyresponseCompatiblewithstandardAcousticEchoCancellers(AECs)HighefficiencyandlowpowerdissipationWidesupplyvoltagerange(fullyoperationalfrom2.7Vto5.5V)TwoI2SinputstosupporttwoaudiosourcesI2C-buscontrolinterface(400kHz)DedicatedspeechmodewithspeechactivitydetectorSpeakercurrentandvoltagemonitoring(viatheI2S-bus)forAcousticEchoCancellation(AEC)atthehostFullyshort-circuitproofacrosstheloadandtothesupplylinesSamplefrequenciesfrom8kHzto48kHzsupported3bitclock/wordselectratiossupported(32x,48x,64x)OptiontorouteI2SinputdirecttoI2SoutputtoallowasecondI2SoutputslavedevicetobeusedincombinationwiththeTFA9890ATDMinterfacesupported(withlimitedfunctionality)VolumecontrolLowRFsusceptibilityInputclockjitterinsensitiveinterfaceThermallyprotected15kVsystem-levelESDprotectionwithoutexternalcomponents‘Popnoise'freeatallmodetransitions3.ApplicationsMobilephonesTabletsPortableNavigationDevices(PND)Notebooks/NetbooksMP3playersandportablemediaplayersSmallaudiosystemsTFA9890A_SDSAllinformationprovidedinthisdocumentissubjecttolegaldisclaimers.©NXPSemiconductorsN.V.2014.Allrightsreserved.ProductshortdatasheetRev.1—16September20143of38NXPSemiconductorsTFA9890A9.5Vboostedaudiosystemwithadaptivesoundmaximizerandspeakerprotection4.Quickreferencedata5.OrderinginformationTable1.QuickreferencedataSymbolParameterConditionsMinTypMaxUnitVBATbatterysupplyvoltageonpinVBAT2.7-5.5VVDDDdigitalsupplyvoltageonpinVDDD1.651.81.95VIBATbatterysupplycurrentonpinVBATandinDC-to-DCconvertercoil;Operatingmodeswithload;DC-to-DCconverterinAdaptiveBoostmode(nooutputsignal,VBAT=3.6V,VDDD=1.8V)-4-mAPower-downmode-1-AIDDDdigitalsupplycurrentonpinVDDD;Operatingmodes;SpeakerBoostProtectionactivated-20-mAonpinVDDD;Operatingmodes;CoolFluxDSPbypassed-6-m