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EL4583C Schematic ( PDF Datasheet ) - Elantec Semiconductor

Teilenummer EL4583C
Beschreibung Sync Separator/ 50% Slice/ S-H/ Filter/ HOUT
Hersteller Elantec Semiconductor
Logo Elantec Semiconductor Logo 




Gesamt 12 Seiten
EL4583C Datasheet, Funktion
EL4583C
Sync Separator, 50% Slice, S-H, Filter, HOUT
Features
• NTSC, PAL, and SECAM sync
separation
• Single supply, +5V operation
• Precision 50% slicing
• Built-in programmable color burst
filter
• Decodes non-standard vertical
• Horizontal sync output
• Sync. pulse amplitude output
• Same socket can be used for 8-pin
EL4581C
• Low-power CMOS
• Detects loss of signal
• Resistor programmable scan rate
• Few external components
• Available in 16-pin PDIP and 16-
pin SO (0.150”) packages
Applications
• Video special effects
• Video test equipment
• Video distribution
• Multimedia
• Displays
• Imaging
• Video data capture
• Video triggers
Ordering Information
Part No
EL4583CN
EL4583CS
EL4583CS-T7
EL4583CS-T13
Package
16-Pin PDIP
16-Pin SO (0.150”)
16-Pin SO (0.150”)
16-Pin SO (0.150”)
Tape &
Reel
-
-
7”
13”
Outline #
MDP0031
MDP0027
MDP0027
MDP0027
General Description
The EL4583C extracts timing from video sync in NTSC, PAL, and
SECAM systems, and non standard formats, or from computer graph-
ics operating at higher scan rates. Timing adjustment is via an external
resistor. Input without valid vertical interval (no serration pulses) pro-
duces a default vertical output.
Outputs are: composite sync, vertical sync, filter, burst/back porch,
horizontal, no signal detect, level, and odd/even output (in interlaced
scan formats only).
The EL4583C sync slice level is set to the mid-point between sync tip
and the blanking level. This 50% point is determined by two internal
sample and hold circuits that track sync tip and back porch levels. It
provides hum and noise rejection and compensates for input levels of
0.5V to 2.0VP-P.
A built in filter attenuates the chroma signal to prevent color burst
from disturbing the 50% sync slice. Cut off frequency is set by a resis-
tor to ground from the Filter Cut Off pin. Additionally, the filter can be
by-passed and video signal fed directly to the Video Input.
The level output pin provides a signal with twice the sync amplitude
which may be used to control an external AGC function. A
TTL/CMOS compatible No Signal Detect Output flags a loss or reduc-
tion in input signal level. A resistor sets the Set Detect Level.
The EL4583C is manufactured using Elantec’s high performance ana-
log CMOS process.
Connection Diagram
FILTER CUT OFF 1
16 ANALOG GND
SET DETECT LEVEL 2
15 HORIZONTAL SYNC OUT
COMPOSITE SYNC OUT 3
14 VDD
FILTER INPUT 4
13 ODD/EVEN OUTPUT
VERTICAL SYNC OUT 5
12 RSET*
DIGITAL GND 6
11 BURST/BACK PORCH OUTPUT
FILTER OUTPUT 7
10 NO SIGNAL DETECT OUTPUT
COMPOSITE VIDEO INPUT 8
9 LEVEL OUTPUT
EL4583C
(8-Pin SO & 8-Pin PDIP)
*Note: RSET must be a 1% register
Manufactured under US Patent 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.
© 2001 Elantec Semiconductor, Inc.






EL4583C Datasheet, Funktion
EL4583C
Sync Separator, 50% Slice, S-H, Filter, HOUT
Timing Diagram
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).
f. Horizontal sync output produces the true “H” pulses of nominal width of 5µs. It has the same delay as the composite sync.
Figure 1.
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6 Page









EL4583C pdf, datenblatt
EL4583C
Sync Separator, 50% Slice, S-H, Filter, HOUT
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 cir-
cuitry 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 Semiconductor, Inc.
675 Trade Zone Blvd.
Milpitas, CA 95035
Telephone: (408) 945-1323
(888) ELANTEC
Fax: (408) 945-9305
European Office: +44-118-977-6020
Japan Technical Center: +81-45-682-5820
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 intended to sup-
port 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 con-
templating 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. Elan-
tec, Inc.’s warranty is limited to replacement of defective
components and does not cover injury to persons or property or
other consequential damages.
12 Printed in U.S.A.

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