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PDF EL4581 Data sheet ( Hoja de datos )
| Número de pieza | EL4581 | |
| Descripción | Sync Separator/ 50% Slice/ S-H/ Filter | |
| Fabricantes | Intersil Corporation | |
| Logotipo |  |
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®
Data Sheet
August 16, 2002
EL4581
FN7172
Sync Separator, 50% Slice, S-H, Filter
The EL4581 extracts timing informa-
tion from standard negative going
video sync found in NTSC, PAL, and
SECAM broadcast systems. It can also be used in non stan-
dard 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 inter-
laced scan formats.
The EL4581 provides a reliable method of determining cor-
rect 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 cir-
cuits that track sync tip and back porch levels. This also
provides a degree of hum and noise rejection to the input sig-
nal, and compensates for varying input levels of 0.5P-P to
2.0VP-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.
Pinout
EL4581
(8-Pin SO, DIP)
TOP VIEW
COMPOSITE 1
SYNC OUT
COMPOSITE
VIDEO IN
VERTICAL
SYNC OUT
GND
2
3
4
8 VDD 5V
7 ODD/EVEN OUTPUT
6 RSET
5 BURST/BACK
PORCH OUTPUT
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-pin PDIP and SO packages
Applications
• Video special effects
• Video test equipment
• Video distribution
• Displays
• Imaging
• Video data capture
• Video triggers
Ordering Information
PART
NUMBER
EL4581CN
EL4581CS
TEMP.
RANGE
-40°C to +85°C
-40°C to +85°C
PACKAGE
8-Pin PDIP
8-Pin SO
PKG. NO.
MDP0031
MDP0027
Demo Board
A dedicated demo board is not available. However, this
device can be placed on the EL4584/5 Demo Board.
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 321-724-7143 | Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright © Intersil Americas Inc. 2003. 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 page  
Timing Diagrams
EL4581
NOTES:
b. The composite sync output reproduces all the video input sync pulses, with a propagation delay.
c. Vertical sync leading edge is coincident with the first vertical serration pulse leading edge, with a propagation delay.
d. Odd-even output is low for even field, and high for odd field.
e. Back porch goes low for a fixed pulse width on the trailing edge of video input sync pulses. Note that for serration pulses during vertical, the back porch starts
on the rising edge of the serration pulse (with propagation delay).
FIGURE 1.
5
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| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet EL4581.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| EL4581 | Sync Separator/ 50% Slice/ S-H/ Filter | Intersil Corporation |
| EL4581C | Sync Separator/ 50% Slice/ S-H/ Filter |  Elantec Semiconductor |
| EL4583 | Sync Separator/ 50% Slice/ S-H/ Filter/ Horizontal sync output | Intersil Corporation |
| EL4583A | Sync Separator |  Intersil |
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