SAF7741-Datasheet-N1F-V5

1.GeneraldescriptionTheSAF7741HVisacombinedIntermediate-Frequency(IF)carradioandaudioDigitalSignalProcessor(DSP)withseveralpowerfulcoresintegratedontoasingledevice.ItcombinesanalogIFinput,digitalradioandaudioprocessing,sample-rateconvertersanddigitalandanalogaudiooutputtoenhancelisteningclarityandnoisesuppressionwhilereducingmultipathchanneleffect.TheSAF7741offersuser-specificfunctionswhichcanbeconfiguredtomatchthesoftwareplatformrequiredbythesystemsofindividualcar-radiomanufacturers,thusprovidingahighlevelofproductdifferentiation.ItisequippedtoworkwiththeTEF7000andTEF6730integratedtunersforanaloganddigitalAM/FMdecodingandsoundprocessingTheSAF7741HVconsistsoftwomainprocessingblocks;oneforradioandtheotherforaudio.TheseblocksdemodulateeithertheIForthelow-IFtuneroutput,deliveringdigitalaudiotointernalDigital-to-AnalogConverters(DACs).Inadditiontothemainblocksthereareanumberofinterfacesanddedicatedsub-circuits.1.1RadioprocessingTheIFradioblockinterfacestothefront-endtunerchipsandsupportseitheraso-calledlow-IFfrequency(of60kHzor300kHz)oranIFfrequencyof10.7MHz.Twotunerinterfacesaresupported,eachofwhichissuitableforanalogFrequency-Modulated/Amplitude-ModulatedandWeatherband(FM/AM/WX)radioreceptionaswellasreceptionofencodeddigitalsignalssuchasHDRadioandDigitalRadioMondiale(DRM).Signalsreceivedfromthetunerfront-endchipsaredigitizedwithintegratedIntermediate-FrequencyAnalog-to-DigitalConverters(IFADCs).Theresultingdigitalsignalsarethendown-sampled,error-correctedandfilteredinthedigitaldomaintobesuitableforfurtherradioandaudioprocessingbytheDSPs.Thelow-IFinterfacetothetunerchipcombinedwiththehighlevelofintegrationallowscost-effectiveimplementationoftheentiretuner/DSPapplicationonamainradioPrintedCircuitBoard(PCB).1.2AudioprocessingTheaudioprocessingblockreceiveseitherexternaldigitalsignals,oranalogsignalswhicharethendigitizedbytheintegratedADCs.Togetherwiththeinternalradioaudiosignalstheseinputsareavailableforfurtheraudioprocessingsuchasequalization,tonecontrolandvolumecontrol.TheoutputsignalsoftheaudioprocessingblockareprovidedindigitalformatontheHostIISoutputsandinanalogformatontheDACoutputs.SAF7741HVDualIFcarradioandaudioDSP(N1F)Rev.05—09May2008ObjectivedatasheetSAF7741_5©NXPB.V.2008.Allrightsreserved.ObjectivedatasheetRev.05—09May20082of83NXPSemiconductorsSAF7741HVDualIFcarradioandaudioDSP(N1F)2.Features2.1HardwarefeaturesSAF7741HVhardwareisconfiguredbyfirmwareandhostsoftwaretomeetspecificcustomerrequirements.ThefirmwareisdefinedbytheRead-OnlyMemory(ROM)codeassociatedwitheachDSP.Remark:Thelistbelowdescribesthemaximumhardwareconfiguration.CustomersshouldconsultwithNXPtoidentifythebestmethodofsupportingtheirownparticularrequirements.„TwoIFdata-pathsofeither2×IF10.7MHzor2×lowIF300kHzinputRemark:Thecombinationof1xIFand1xlowIFisnotsupported.„Two5thorderSigma-Delta(ΣΔ)IFADCsforFM/AM/WB(Weather-band)anddigitalradioateitherIF=10.7MHzorlowIF=300kHz„IFsignalquadrature-mixinganddown-samplingwithsignallevelgeneration„AutomaticGainControl(AGC)oftheradiofront-endchipinthreesteps(6dBforeachstep)fortheTEF6730tunerandsevensteps(6dBforeachstep)fortheTEF7000tuner„AGCcontroloftheTEF6730tunerfront-endPINdiodes,withananalogsignalviatheRadioGeneral-PurposeDAC(RGPDAC)output:oneDACforeachradiodatapath„IntegratedIFfilterwithbandwidthof100kHzor400kHz„Twowidebandoutputsforexternaldigitalradiodecoding;oneoutputforeachdata-path„TwoRadioDataSystem(RDS)decoders„Fivebit-stream,3rdorderaudio,ΣΔADCswithananti-aliasingbroadbandinput-filter„Eightconfigurableanaloginputs(differential/stereo/mono)connectedtoanyofthefiveADCsusingananalogswitchbox„DedicatedDSPfortheSampleRateConverter(SRC)„AudioHostInter-ICSound(IIS)Input/Output(I/O)port,witheight/tenoutputsandeightinputswithanoptionforslavingtheDSPtoanexternalmastersample-rate„AudioHostIISBit-Clock(BCK)andWord-Size(WS)availablesimultaneouslyatfull-rateandhalf-rate„FourindependentIISinputsandtwoindependentdigitalSony/PhilipsDigitalInterfaceFormat(SPDIF)inputsalsoconfigurableforDigitalVersatileDisc/DigitalVideoDevice(DVD)multi-channeldatainputs„RadioHostIISmasterwithseparatedatainandoutlines„IISoutputwithbufferforeightsamplesforradioapplications„WatchDog(WDOG)tomonitorexecutionoftheDSPmainsoftwareloop„Phase-LockLoop(PLL)togeneratetheDSPclockfromtheoscillatorcrystal„PLLtogeneratetheaudioreferencesample-rateclock„Internalvoltageregulatorforthe1.8Vsupply„I2C(Inter-ICCommunication)bus-controlled„Possibilityofpoweringdownunusedblockstoreducepowerdissipation„QualifiedinaccordancewithAEC-Q100SAF7741_5©NXPB.V.2008.Allrightsreserved.ObjectivedatasheetRev.05—09May20083of83NXPSemiconductorsSAF7741HVDualIFcarradioandaudioDSP(N1F)2.2SoftwareFeaturesThefollowingsoftwarefeaturesareavailablefortheSAF7741HV:„ImprovedFMweak-signalprocessing„Integrated19kHzMultiplexed(MPX)filterandde-emphasis„ElectronicadjustmentofFM/AMlevelandFMchannelseparation„VariableIFbandwidth.ThisiscontrolledpartlybytheDSPsoftwareanddependsonthequalityofthereception„SelectiveIFbandwidthforwidebandFM,FMWeatherbandandAM„VariableIFbandwidthonFM,dependen