®
EL4581
Data Sheet
February 8, 2008
FN7172.1
Sync Separator, 50% Slice, S-H, Filter
The EL4581 extracts timing
information from standard negative
going video sync found in NTSC, PAL
and SECAM broadcast systems. It can also be used in non
standard formats and with computer graphics systems at
higher scan rates, by adjusting a single external resistor.
When the input does not have correct serration pulses in the
vertical interval, a default vertical output is produced.
Outputs are composite sync, vertical sync, burst/back porch
output, and odd/even output. The later operates only in
interlaced scan formats.
The EL4581 provides a reliable method of determining
correct sync slide level by setting it to the mid-point between
sync tip and blanking level at the back porch. This 50% level
is determined by two internal self timing sample and hold
circuits that track sync tip and back porch levels. This also
provides a degree of hum and noise rejection to the input
signal, and compensates for varying input levels of 0.5V
P-P
to 2.0V
P-P
.
A built in linear phase, third order, low pass filter attenuates
the chroma signal in color systems to prevent incorrectly set
color burst from disturbing the 50% sync slide.
This device may be used to replace the industry standard
LM1881, offering improved performance and reduced power
consumption.
The EL4581 video sync separator is manufactured using
Elantec’s high performance analog CMOS process.
Features
• NTSC, PAL and SECAM sync separation
• Single supply, +5V
• Precision 50% slicing, internal caps
• Built-in color burst filter
• Decodes non-standard verticals
• Pin compatible with LM1881
• Low power
• Typically 1.5mA supply current
• Resistor programmable scan rate
• Few external components
• Available in 8 Ld PDIP and SOIC packages
• Pb-free available (RoHS compliant)
Applications
• Video special effects
• Video test equipment
• Video distribution
• Displays
• Imaging
• Video data capture
• Video triggers
Ordering Information
Pinout
EL4581
(8 LD SOIC, PDIP)
TOP VIEW
COMPOSITE
SYNC OUT
COMPOSITE
VIDEO IN
VERTICAL
SYNC OUT
GND
1
2
3
4
8
7
6
5
VDD 5V
ODD/EVEN OUTPUT
RSET
BURST/BACK
PORCH OUTPUT
PART
NUMBER
EL4581CN
EL4581CS*
PART
MARKING
EL4581CN
4581CS
TEMP. RANGE
PACKAGE
PKG.
DWG. #
MDP0031
MDP0027
MDP0027
-40°C to +85°C 8 Ld PDIP
-40°C to +85°C 8 Ld SOIC
-40°C to +85°C 8 Ld SOIC
(Pb-free)
EL4581CSZ* 4581CSZ
(Note)
NOTE: These Intersil Pb-free plastic packaged products employ special
Pb-free material sets; molding compounds/die attach materials and 100%
matte tin plate PLUS ANNEAL - e3 termination finish, which is RoHS
compliant and compatible with both SnPb and Pb-free soldering
operations. Intersil Pb-free products are MSL classified at Pb-free peak
reflow temperatures that meet or exceed the Pb-free requirements of
IPC/JEDEC J STD-020.
Demo Board
A dedicated demo board is not available. However, this
device can be placed on the EL4584/5 Demo Board.
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or
1-888-468-3774
|
Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright © Intersil Americas Inc. 2003, 2008. All Rights Reserved. Elantec is a registered trademark of Elantec Semiconductor, Inc.
All other trademarks mentioned are the property of their respective owners. Manufactured under U.S. Patent 5,528,303. Manufactured under License, U.S. Patents 5,486,869; 5,754,250.
1
INTERSIL [ INTERSIL CORPORATION ]
