LM1881

The LM1881 Video sync separator extracts timing information including composite and vertical sync, burst/back porch timing, and odd/even field information from standard negative going sync NTSC, PAL and SECAM video signals with amplitude from 0.5V to 2V 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.

Applications

• Strip the synchronization signals from composite video sources that are in, or similar to, the N.T.S.C. format
• Gen - lock video camera/VTR signals with graphics sources
• Provide identification of video fields for memory storage
• Recover suppressed or contaminated sync signals
• Provide timing references for the extraction of coded or uncoded data on specific video scan lines

Key features

• AC coupled composite input signal
• >10kΩ input resistance
• <10 mA power supply drain current
• Composite sync and vertical outputs
• Odd/even field output
• Burst gate/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)