LM1881,LM1881-X
VideoSyncSeparator
GeneralDescription
TheLM1881Videosyncseparatorextractstiminginforma-
tionincludingcompositeandverticalsync,burst/backporch
timing,andodd/evenfieldinformationfromstandardnega-
tivegoingsyncNTSC,PAL*andSECAMvideosignalswith
amplitudefrom0.5Vto2Vp-p.Theintegratedcircuitisalso
capableofprovidingsyncseparationfornon-standard,
fasterhorizontalratevideosignals.Theverticaloutputis
producedontherisingedgeofthefirstserrationinthe
verticalsyncperiod.Adefaultverticaloutputisproduced
afteratimedelayiftherisingedgementionedabovedoes
notoccurwithintheexternallysetdelayperiod,suchas
mightbethecaseforanon-standardvideosignal.
ACcoupledcompositeinputsignal
>10kΩ inputresistance
<10mApowersupplydraincurrent
Compositesyncandverticaloutputs
Odd/evenfieldoutput
Burstgate/backporchoutput
Horizontalscanratesto150kHz
Edgetriggeredverticaloutput
Defaulttriggeredverticaloutputfornon-standardvideo
signal(videogames-homecomputers)
-40˚Cto+85˚Coperation(LM1881-X)
