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EL4581C Schematic ( PDF Datasheet ) - Elantec Semiconductor

Teilenummer EL4581C
Beschreibung Sync Separator/ 50% Slice/ S-H/ Filter
Hersteller Elantec Semiconductor
Logo Elantec Semiconductor Logo 




Gesamt 12 Seiten
EL4581C Datasheet, Funktion
EL4581C
Sync Separator 50% Slice S-H Filter
Features
 NTSC PAL and SECAM sync
separation
 Single supply a5V
 Precision 50% slicing internal
caps
 Built-in color burst filter
 Decodes non-standard verticals
 Pin compatible with LM1881
 Low power
 Typically 1 5 mA supply current
 Resistor programmable scan rate
 Few external components
 Available in 8-pin DIP and SO-8
pkg
Applications
 Video special effects
 Video test equipment
 Video distribution
 Displays
 Imaging
 Video data capture
 Video triggers
Ordering Information
Part No Temp Range Package Outline
EL4581CN b40 C to a85 C 8-Pin DIP MDP0031
EL4581CS b40 C to a85 C 8-Lead SO MDP0027
Demo Board
A dedicated demo board is not
available However this device can
be placed on the EL4584 5 Demo
Board
General Description
The EL4581C extracts timing information from standard nega-
tive going video sync found in NTSC PAL and SECAM broad-
cast systems It can also be used in non standard formats and
with computer graphics systems at higher scan rates by adjust-
ing a single external resistor When the input does not have
correct serration pulses in the vertical interval a default verti-
cal output is produced
Outputs are composite sync vertical sync burst back porch
output and odd even output The later operates only in inter-
laced scan formats
The EL4581C 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 deter-
mined 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 5 p-p to 2 0 Vp-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 EL4581C video sync separator is manufactured using
Elantec’s high performance analog CMOS process
Connection Diagram
EL4581C SO P-DIP Packages
Top View
4581 – 1
Manufactured under U S Patent No 5 528 303
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
1993 Elantec Inc






EL4581C Datasheet, Funktion
EL4581C
Sync Separator 50% Slice S-H Filter
Figure 2
4581 – 5
Figure 3
6
4581 – 6

6 Page









EL4581C pdf, datenblatt
EL4581C
Sync Separator 50% Slice S-H Filter
General Disclaimer
Specifications contained in this data sheet are in effect as of the publication date shown Elantec Inc reserves the right to make changes
in the circuitry or specifications contained herein at any time without notice Elantec Inc assumes no responsibility for the use of any
circuits described herein and makes no representations that they are free from patent infringement
Elantec Inc
1996 Tarob Court
Milpitas CA 95035
Telephone (408) 945-1323
(800) 333-6314
Fax (408) 945-9305
European Office 44-71-482-4596
WARNING Life Support Policy
Elantec Inc products are not authorized for and should not be
used within Life Support Systems without the specific written
consent of Elantec Inc Life Support systems are equipment in-
tended to support or sustain life and whose failure to perform
when properly used in accordance with instructions provided can
be reasonably expected to result in significant personal injury or
death Users contemplating application of Elantec Inc products
in Life Support Systems are requested to contact Elantec Inc
factory headquarters to establish suitable terms conditions for
these applications Elantec Inc ’s warranty is limited to replace-
ment of defective components and does not cover injury to per-
sons or property or other consequential damages
12 Printed in U S A

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