FN7174 Rev 3.00

Page 1 of 15

May 9, 2008

FN7174

Rev 3.00

May 9, 2008

EL4584

Horizontal Genlock, 4FSC

DATASHEET

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

elements used in some workstation graphics. To generate

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

• 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

(Note 1)

CCIR 601

(Note 2)

SQUARE

(Note 3)

Divisor

851

864

944

1135

13.301

13.5

14.75

17.734

Divisor

682

858

780

910

10.738

13.5

12.273

14.318

NOTES:

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.

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.