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.
E
L
45
83
C
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
1
2
3
4
16
15
14
13
5
6
7
12
11
10
8
9
FILTER CUT OFF
SET DETECT LEVEL
COMPOSITE SYNC OUT
FILTER INPUT
VERTICAL SYNC OUT
DIGITAL GND
FILTER OUTPUT
COMPOSITE VIDEO INPUT
ANALOG GND
HORIZONTAL SYNC OUT
VDD
ODD/EVEN OUTPUT
RSET*
BURST/BACK PORCH OUTPUT
NO SIGNAL DETECT OUTPUT
LEVEL OUTPUT
EL4583C
(8-Pin SO & 8-Pin PDIP)
*Note: RSET must be a 1% register
Manufactured under US Patent 5,528,303
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
Package
Tape &
Reel
Outline #
EL4583CN
16-Pin PDIP
-
MDP0031
EL4583CS
16-Pin SO (0.150”)
-
MDP0027
EL4583CS-T7
16-Pin SO (0.150”)
7”
MDP0027
EL4583CS-T13
16-Pin SO (0.150”)
13”
MDP0027
EL4583C
Sync Separator, 50% Slice, S-H, Filter, HOUT
A
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gu
st
6,
20
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