电子元器件应用-TLV320AIC3104 Programming Made Easy

电子元器件应用-TLV320AIC3104 Programming Made Easy

ApplicationReport

SLAA403–February2009

TLV320AIC3104ProgrammingMadeEasy

DavidK.WilsonAudioConverterProducts

ABSTRACT

TheTLV320AIC3104(AIC3104)isaversatileaudiocodecwithmultiplefeatures.WhenfirstdesigningwiththeAIC3104,readingtheentiredatasheetandbecomingfamiliarwiththeentireregistersetcanbeadauntingtask.However,inmanycommonconfigurations,itispossibletogettheAIC3104upandrunningwhileonlywritingtoasfewas12registers.

Althoughnotintendedtoreplacethedatasheet,thisdocumentdetailsseveralcommonconfigurationsfortheAIC3104.Itgivesaconcisedescriptionofhowtosetupthecodecandgivesascriptexamplethatcanbeusedtoaccelerateyourdesign.

1ControllingtheAIC3104

AllfeaturesoftheAIC3104areaccessedbyprogrammableregisters.TheregisterscanbeprogrammedbyanexternalmicroprocessororDSPusingI2C protocol.Themasterclock(MCLK)isnotrequiredtoberunningwhileprogrammingtheAIC3104.Thefixed7-bitI2CaddressfortheAIC3104is0011000(0x30htowrite,0x31htoread).TheAIC3104supportsI2Cdataratesupto400kHz.

ItisgoodpracticetoperformahardwareresetafterinitialpoweruptoensurethatallregistersareintheirdefaultstatesandthattheAIC3104isreadytobeprogrammed.

2DeterminingSampleRateandMasterClock

Frequency

ThefirsttaskforanydesignusingtheAIC3104istodeterminethedesiredsamplerateandmasterclockfrequency.Withtheexceptionofregisterprogramming,allinternaltiming,includingthesamplerate,isultimatelyderivedfromanexternalmasterclock.Bydefault,theADCandDACsampleratesareMCLK/256.Forthecommonaudiosamplerates44.1kspsand48ksps,themostcommonMCLK

frequenciesare11.2896MHz(44.1ksps×256)and12.288MHz(48ksps×256).IfyouareusingoneofthesetwoMCLKfrequenciesandsamplerates,noregisterprogrammingisneededtosetthesamplerate.

Table1showstwocommonaudioMCLKfrequenciesandthesettingsrequiredtoobtaincommonsampleTable1.MCLKFrequenciesandSettings

I2CisatrademarkofKoninklijkePhilipsElectronicsNV.SLAA403–February2009

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