EL4583C
Sync Separator, 50% Slice, S-H, Filter, H
OUT
Features
General Description
• 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
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).
• Sync. pulse amplitude output
• Same socket can be used for 8-pin
EL4581C
• Low-power CMOS
• Detects loss of signal
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
.
• Resistor programmable scan rate
• Few external components
• Available in 16-pin PDIP and 16-
pin SO (0.150”) packages
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.
Applications
• Video special effects
• Video test equipment
• Video distribution
• Multimedia
The EL4583C is manufactured using Elantec’s high performance ana-
log CMOS process.
• Displays
• Imaging
• Video data capture
• Video triggers
Connection Diagram
FILTER CUT OFF
SET DETECT LEVEL
COMPOSITE SYNC OUT
FILTER INPUT
1
2
3
4
5
6
7
8
16 ANALOG GND
15 HORIZONTAL SYNC OUT
14 VDD
Ordering Information
Tape &
Reel
Part No
EL4583CN
EL4583CS
Package
Outline #
MDP0031
MDP0027
MDP0027
MDP0027
16-Pin PDIP
-
13 ODD/EVEN OUTPUT
12 RSET*
16-Pin SO (0.150”)
16-Pin SO (0.150”)
-
EL4583CS-T7
7”
13”
VERTICAL SYNC OUT
DIGITAL GND
EL4583CS-T13 16-Pin SO (0.150”)
11 BURST/BACK PORCH OUTPUT
10 NO SIGNAL DETECT OUTPUT
FILTER OUTPUT
COMPOSITE VIDEO INPUT
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.
ELANTEC [ ELANTEC SEMICONDUCTOR ]
