标签: pic选型

Oscillatorsareanimportantcomponentofradiofre-quency(RF)anddigitaldevices.Today,productdesignengineersoftendonotfindthemselvesdesigningoscil-latorsbecausetheoscillatorcircuitryisprovidedonthedevice.However,thecircuitryisnotcomplete.Selec-tionofthecrystalandexternalcapacitorshavebeenlefttotheproductdesignengineer.Iftheincorrectcrys-talandexternalcapacitorsareselected,itcanleadtoaproductthatdoesnotoperateproperly,failsprema-turely,orwillnotoperateovertheintendedtemperaturerange.Forproductsuccessitisimportantthatthedesignerunderstandhowanoscillatoroperatesinordertoselectthecorrectcrystal.AN826CrystalOscillatorBasicsandCrystalSelectionforrfPICTMandPICmicroDevicesWhattemperaturestabilityisneeded?Author:StevenBibleMicrochipTechnologyInc.Whattemperaturerangewillberequired?Whichenclosure(holder)doyoudesire?INTRODUCTIONWhatloadcapacitance(CL)doyourequire?Whatshuntcapacitance(C0)doyourequire?Oscillatorsareanimportantco……