The EL1882C video sync separator is
manufactured using Elantec's high
performance analog CMOS process.
This device extracts sync timing information from both
standard and non-standard video input. It provides
composite sync, vertical sync, burst/back porch timing and
odd/even field detection. 50% sync tip slicing provides
precise sync edge detection when the video input level is
between 0.5VP-P and 2VP-P (sync tip amplitude 143mV to
572mV). A single external resistor sets all internal timing to
adjust for various video standards. The composite sync
output follows video in sync pulses, and a vertical sync
pulse is output on the rising edge of the first vertical serration
following the vertical pre-equalizing string. For non-standard
vertical inputs, a default vertical pulse is output when the
vertical signal stays low for longer than the vertical sync
default delay time. The odd/even output indicates field
polarity detected during the vertical blanking interval. The
EL1882C is plug-in compatible with the industry standard
LM1881 and can be substituted for that part in 5V
applications with improved 50% slicing and lower required
supply current.