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.

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

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