Note: All information contained in this data sheet has been carefully checked and is believed to be accurate as of the date of publication; however, this data sheet cannot be a “controlled document”. Current revisions, if any, to these
specifications are maintained at the factory and are available upon your request. We recommend checking the revision level before finalization of your design documentation.
© 2001 Elantec Semiconductor, Inc.
EL1881C
General Description
The EL1881C video sync separator is manufactured using Elantec’s
high performance analog CMOS process. This device extracts sync
timing information from both standard and non-standard video input.
It provides composite sync, vertical sync, burst/back porch timing, and
odd/even field detection. Fixed 70mV sync tip slicing provides sync
edge detection when the video input level is between 0.5V
P-P
and -
2V
P-P
(sync tip amplitude 143mV to 572mV). A single external resis-
tor sets all internal timing to adjust for various video standards. The
composite sync output follows video in sync pulses and a vertical sync
pulse is output on the rising edge of the first vertical serration follow-
ing the vertical pre-equalizing string. For non-standard vertical inputs,
a default vertical pulse is output when the vertical signal stays low for
longer than the vertical sync default delay time. The odd/even output
indicates field polarity detected during the vertical blanking interval.
The EL1881C is plug-in compatible with the industry-standard
LM1881 and can be substituted for that part in 5V applications with
lower required supply current.
The EL1881C is available in the 8-pin PDIP and SO packages and is
specified for operation over the full -40°C to +85°C temperature
range.
Connection Diagram
1
2
3
4
8
7
6
5
Composite Sync Out
Composite Video In
Vertical Sync Out
GND
VDD 5V
Odd/Even Output
RSET
Burst/Back Porch Output
Features
• NTSC, PAL, SECAM, non-
standard video sync separation
• Fixed 70mV slicing of video input
levels from 0.5V
P-P
to 2V
P-P
• Low supply current - 1.5mA typ.
• Single +5V supply
• Composite, vertical sync output
• Odd/even field output
• Burst/back porch output
• Available in 8-pin PDIP and SO
packages
Applications
• Video amplifiers
• PCMCIA applications
• A/D drivers
• Line drivers
• Portable computers
• High-speed communications
• RGB applications
• Broadcast equipment
• Active filtering
Demo Board
A dedicated demo board is available.
Ordering Information
Part No. Package Tape & Reel Outline #
EL1881CN 8-Pin PDIP - MDP0031
EL1881CS 8-Pin SO - MDP0027
EL1881CS-T7 8-Pin SO 7” MDP0027
EL1881CS-T13 8-Pin SO 13” MDP0027
EL1881C
Sync Separator, Low Power
September 18, 2001
