9

EL4501C - Preliminary

Video Front End

Description of Operation

The EL4501C incorporates the following functional

blocks:

• DC restore amplifier

• Advanced sync separator

• Data Slicer

Combined they provide the key analog processing func-

tions for a number of video system applications. The

operation of each of these blocks is described below.

Sync Separator

The sync separator contained in the EL4501C has been

designed to be compatible with a wide range of video

signal standards, operating with horizontal line rates

from PAL/NTSC rates up to 150kHz. The sync separator

also includes a qualification scheme which rejects noise

pulses and other video artifacts. The horizontal line rate

The following outputs are available:

• Composite sync

• Horizontal sync

• Vertical sync

• Burst gate

• Odd/Even field identification

• Loss of signal detected

• Sync amplitude detected