The EL4583CSZ is a Sync Separator that extracts timing from video sync in NTSC, PAL and SECAM systems and non standard formats or from computer graphics operating at higher scan rates. Timing adjustment is via an external resistor. Input without valid vertical interval (no serration pulses) produces a default vertical output. Outputs are - composite sync, vertical sync, filter, burst/back porch, horizontal, no signal detect, level and odd/even output (in interlaced scan formats only). The EL4583 sync slice level is set to the mid-point between sync tip and the blanking level. This 50% point is determined by two internal sample and hold circuits that track sync tip and back porch levels. It provides hum and noise rejection and compensates for input levels of 0.5V to 2.0VP-P. A built in filter attenuates the chroma signal to prevent colour burst from disturbing the 50% sync slice. Cut off frequency is set by a resistor to ground from the Filter Cut Off pin.
