TheAD9549providessynchronizationformanysystems,includingsynchronousopticalnetworks(SONET/SDH).TheAD9549generatesanoutputclock,synchronizedtooneoftwoexternalinputreferences.Theexternalreferencesmaycontainsignificanttimejitter,alsospecifiedasphasenoise.Usingadigitallycontrolledloopandholdovercircuitry,theAD9549continuestogenerateaclean(lowjitter),validoutputclockduringalossofreferencecondition,evenwhenbothreferenceshavefailed.
TheAD9549operatesoveranindustrialtemperaturerangeof−40°Cto+85°C.