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EL4584CN Datasheet(PDF) 1 Page - Intersil Corporation |
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EL4584CN Datasheet(HTML) 1 Page - Intersil Corporation |
1 / 15 page 1 ® FN7174.3 EL4584 Horizontal Genlock, 4FSC The EL4584 is a PLL (Phase Lock Loop) sub system, designed for video applications but also suitable for general purpose use up to 36MHz. In video applications, this device generates a TTL/CMOS compatible Pixel Clock (CLK OUT) which is a multiple of the TV horizontal scan rate and phase locked to it. The reference signal is a horizontal sync signal, TTL/CMOS format, which can be easily derived from an analog composite video signal with the EL4583 Sync Separator. An input signal to “coast” is provided for applications where periodic disturbances are present in the reference video timing, such as VTR head switching. The Lock detector output indicates correct lock. The divider ratio is four ratios for NTSC and four similar ratios for the PAL video timing standards, by external selection of three control pins. These four ratios have been selected for common video applications including 4FSC, 3FSC, 13.5MHz (CCIR 601 format) and square picture elements used in some workstation graphics. To generate 8FSC, 6FSC, 27MHz (CCIR 601 format) etc. use the EL4585, which includes an additional divide-by-two stage. For applications where these frequencies are inappropriate or for general purpose PLL applications, the internal divider can be bypassed and an external divider chain used. Features • 36MHz, general purpose PLL •4FSC based timing (use the EL4585 for 8FSC) • Compatible with EL4583 sync separator • VCXO, Xtal, or LC tank oscillator • < 2ns jitter (VCXO) • User controlled PLL capture and lock • Compatible with NTSC and PAL TV formats • 8 pre-programmed TV scan rate clock divisors • Selectable external divide for custom ratios • Single 5V, low current operation • Pb-Free available (RoHS compliant) Applications • Pixel clock regeneration • Video compression engine (MPEG) clock generator • Video capture or digitization • PIP (Picture-in-Picture) timing generator • Text or graphics overlay timing Demo Board A demo PCB is available for this product. TABLE 1. FREQUENCIES AND DIVISORS FUNCTION 3FSC (Note 1) CCIR 601 (Note 2) SQUARE (Note 3) 4FSC Divisor 851 864 944 1135 PAL FOSC (MHz) 13.301 13.5 14.75 17.734 Divisor 682 858 780 910 NTSC FOSC (MHz) 10.738 13.5 12.273 14.318 NOTES: 1. 3FSC numbers do not yield integer divisors. 2. CCIR 601 Divisors yield 720 pixels in the portion of each line for NTSC and PAL. 3. Square pixels format gives 640 pixels for NTSC and 768 pixels for PAL in the active portion. Ordering Information PART NUMBER PART MARKING PACKAGE PKG. DWG. # EL4584CN EL4584CN 16 Ld PDIP MDP0031 EL4584CS* EL4584CS 16 Ld SOIC MDP0027 EL4584CSZ* (Note) EL4584CSZ 16 Ld SOIC (Pb-free) MDP0027 *Add “-T7” or “-T13” suffix for tape and reel. Please refer to TB347 for details on reel specifications. **For 6FSC and 8FSC clock frequencies, see EL4585 datasheet. NOTE: These Intersil Pb-free plastic packaged products employ special Pb-free material sets; molding compounds/die attach materials and 100% matte tin plate PLUS ANNEAL - e3 termination finish, which is RoHS compliant and compatible with both SnPb and Pb-free soldering operations. Intersil Pb-free products are MSL classified at Pb-free peak reflow temperatures that meet or exceed the Pb-free requirements of IPC/JEDEC J STD-020. Data Sheet May 9, 2008 CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. 1-888-INTERSIL or 1-888-468-3774 | Intersil (and design) is a registered trademark of Intersil Americas Inc. Copyright Intersil Americas Inc. 2003-2008. All Rights Reserved All other trademarks mentioned are the property of their respective owners. |
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