SNLS384F – FEBRUARY 1995 – REVISED MARCH 2013
LM1881 Video Sync Separator
Check for Samples:
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FEATURES
AC Coupled Composite Input Signal
>10 kΩ 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)
DESCRIPTION
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
(1)
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.
(1)
PAL in this datasheet refers to European broadcast TV
standard “Phase Alternating Line”, and not to Programmable
Array Logic.
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Connection Diagram
Figure 1. LM1881N
See Package Number D0008A or P0008E
These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam
during storage or handling to prevent electrostatic damage to the MOS gates.
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Copyright © 1995–2013, Texas Instruments Incorporated
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
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