EL4581C

. NTSC PAL and SECAM sync separation
. Single supply+ 5V
. Precision 50% slicing internal caps
. Built-in color burst filter
. Decodes non-standard verticals
. Pin compatible with LM1881
. Low power
. Typically 15 mA supply current
. Resistor programmable scan rate
. Few external components
. Available in 8-pin DIP and SO-8 pkg

. Video special effects
. Video test equipment
. Video distribution
. Displays
. Imaging
. Video data capture
. Video triggers

The EL4581C extracts timing information from standard nega-tive going video sync found in NTSC PAL and SECAM broad-cast systems It can also be used in non standard formats andwith computer graphics systems at higher scan rates by adjust-ing a single external resistor When the input does not have correct serration pulses in the vertical interval a default verti- cal output is produced

Outputs are composite sync vertical sync burstback porch output and oddeven output The later operates only in inter- laced scan formats

The EL4581C 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 This 50% level is deter- mined by two internal self timing sample and hold circuits that track sync tip and back porch levels This also provides a degree of hum and noise rejection to the input signal and compensates for varying input levels of 05 p-p to 20 Vp-p

A built in linear phase third order low pass filter attenuates the chroma signal in color systems to prevent incorrectly set color burst from disturbing the 50% sync slide

This device may be used to replace the industry standard LM1881 offering improved performance and reduced power consumption

The EL4581C video sync separator is manufactured using Elantec's high performance analog CMOS process