DATASHEET
EL4583A FN7503
Rev 2.00
November 12, 2010 Sync Separator, 50% Slice, S-H, Filter, HOUT
The EL4583A 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). Features NTSC, PAL, and SECAM sync separation Single supply, +5V operation Precision 50% slicing Built-in programmable color burst filter Decodes non-standard vertical Horizontal sync output The EL4583A 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. Sync pulse amplitude output A built in filter attenuates the chroma signal to prevent color
burst from disturbing the 50% sync slice. Cut off frequency is
set by a resistor to ground from the Filter Cut Off pin.
Additionally, the filter can be by-passed and video signal fed
directly to the Video Input. Few external components The level output pin provides a signal with twice the sync
amplitude which may be used to control an external AGC
function. A TTL/CMOS compatible No Signal Detect Output …
