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EL4581
Sync Separator, 50% Slice, S-H, Filter
The EL4581 extracts timing information from standard negative going video sync found in NTSC, PAL and SECAM broadcast systems. It can also be used in non standard formats and with computer graphics systems at higher scan rates, by adjusting a single external resistor. When the input does not have correct serration pulses in the vertical interval, a default vertical output is produced.
Outputs are composite sync, vertical sync, burst/back porch output, and odd/even output. The later operates only in interlaced scan formats.
The EL4581 provides a reliable method of determining correct sync slide level by setting it to the mid-point between sync tip and blanking level at the back porch.
EL4581 Datasheet
