1 Features

1• AC Coupled Composite Input Signal

• >10-kΩ Input Resistance

• <10-mA Power Supply Drain Current

• Composite Sync and Vertical Outputs

• Odd and Even Field Output

• Burst Gate or Back Porch Output

• Horizontal Scan Rates to 150 kHz

• Edge Triggered Vertical Output

• Default Triggered Vertical Output for Non-

Standard Video Signal (Video Games-Home

Computers)

2 Applications

• Video Cameras and Recorders

• Broadcasting Systems

• Set-Top Boxes

• Home Entertainment

• Computing and Gaming Applications

3 Description

The LM1881 Video sync separator extracts timing

information including composite and vertical sync, burst or back porch timing, and odd and even field

information from standard negative going sync NTSC,

PAL (1) and SECAM video signals with amplitude from

0.5-V to 2-V p-p. The integrated circuit is also capable of providing sync separation for non-

standard, faster horizontal rate video signals. The

vertical output is produced on the rising edge of the

first serration in the vertical sync period. A default

vertical output is produced after a time delay if the rising edge mentioned above does not occur within

the externally set delay period, such as might be the

case for a non-standard video signal.