The EL4583 extracts timing from video sync in NTSC, PAL, and SECAM systems, and non standard formats, or from computer graphics operating at higher scan rates. Timing adjustment is via an external resistor. Input without valid vertical interval (no serration pulses) produces 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 EL4583 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 resistor 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 reduction in input signal level. A resistor sets the Set Detect Level. The EL4583 is manufactured using Elantec's high performance analog CMOS process.


  • 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 EL4581
  • 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
  • Pb-Free Plus Anneal Available (RoHS Compliant)


  • Video special effects
  • Video test equipment
  • Video distribution
  • Multimedia
  • Displays
  • Imaging
  • Video data capture
  • Video triggers

tuneProduct Options

Part Number Part Status Pkg. Type Carrier Type MOQ Buy Sample
Active SOICN Tube 47
Active SOICN Reel 2500
Active SOICN Reel 1000


Title language Type Format File Size Date
Datasheets & Errata
star EL4583 Datasheet Datasheet PDF 575 KB
Application Notes & White Papers
AN1695: Basics of Video: from Simple Analog to HDTV Application Note PDF 644 KB
AN1095: Temperature Compensation for the EL4581 and EL4583 Application Note PDF 228 KB
AN1099: A Simple Circuit Removes Sync Application Note PDF 311 KB
AN9738: Video Module Interface (VMI) for ICs Application Note PDF 320 KB
AN9759: Signal Processing Blocks - A Tutorial Application Note PDF 1002 KB
AN9764: PALplus Overview Application Note PDF 250 KB
AN9644: Composite Video Separation Techniques Application Note PDF 2.79 MB
AN9741: Basic DACs for Electronic Engineers Application Note PDF 410 KB
PCN12085 - 8l, 14l, 16l SOIC w/ Gold Bond Wire @ ATP as Alternate Assembly Site Product Change Notice PDF 152 KB
PIN19028 - Q3 Cy 19 Price Increase Notice Price Increase Notice PDF 208 KB
TB430: Video Sync Separator, Horiz Genlock Other PDF 165 KB