GS1881_09 datasheet, PDF - EEWORLD Datasheet

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GS1881_09: DescriptionMonolithic Video Sync Separators; File Size4MB，29 Pages; ManufacturerGennum ( Semtech ); Websitehttp://www.gennum.com

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GS1881_09 Overview

Monolithic Video Sync Separators

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GS1881, GS4881, GS4981 Monolithic Video Sync Separators

Features

•

noise tolerant odd/even flag, back porch and

horizontal sync pulse

fast recovery from impulse noise

excellent temperature stability

0.5V to 4Vpp input signal amplitude with 5V supply

well-controlled clamp discharge current and slicing

level

programmable horizontal scan rate (up to 130kHz)

composite, vertical, back porch, odd/even (GS1881,

GS4881), horizontal (GS4981) outputs

predictable vertical output pulse width with default

trigger for non-standard video signals

Pb-free and Green

5V to 12V supply voltage range

pin compatible with LM1881 sync separator

Description

The GS1881, GS4881 and GS4981 are general purpose sync

separators for use in a wide variety of video applications.

The devices extract the timing information from composite

video signals with scan rates from 15 to 130kHz.

The GS1881 is a drop-in replacement for the industry

standard LM1881 with much improved performance. The

device generates composite sync, vertical sync, back porch

and odd/even field signals. The GS4881 is identical to the

GS1881 but features a noise immune back porch pulse

which maintains a constant H rate during the vertical

interval. The GS4981 is identical to the GS4881, except that

it provides horizontal sync in place of the odd/even output.

All three devices feature a self-adjusting windowing circuit

for noise immunity, which synchronizes to H rate. This

windowing circuit determines the odd or even field in the

GS1881 and GS4881, gates the back porch pulse in the

GS4881 and GS4981, and generates the horizontal sync

output in the GS4981.

The devices feature an improved input stage which ensures

that the input signal is sliced at a predictable point due to

well-controlled input clamp discharge current and sync

slicing level. A missing pulse detector enables the devices

to recover quickly from impulse noise disturbances by

temporarily increasing the clamp discharge current by

roughly ten times. The input stage will operate with signals

from 0.5 to 4Vp-p with a 5V supply.

The GS1881, GS4881 and GS4981 also feature a predictable

vertical output pulse width with a default trigger for

non-standard video signals. All three are available in

commercial and industrial temperature ranges and are

packaged in both DIP and SOIC.

Application Selection Chart

Application

Direct LM1881 Replacement with

Improved Performance

New Applications Substitution for

LM1881

New Applications Requiring Horizontal

Sync Output

Choose Device:

GS1881

GS4881

GS4981

GS1881, GS4881, GS4981 Monolithic Video Sync

Separators

Data Sheet

6926 - 5

November 2009

www.gennum.com

1 of 29

Proprietary & Confidential

Revision History

Version

Date

November 2009

Changes and/or Modifications

Updated to latest Gennum template and changed from

document number 52023 to 6926.

Added lead-free and green information.

Revisions made.

New document.

July 2004

–

March 1991

Contents

Features.................................................................................................................................................................1

Application Selection Chart ...........................................................................................................................1

Description...........................................................................................................................................................1

Revision History .................................................................................................................................................2

1. Pin Connections .............................................................................................................................................3

1.1 Pin Connections ................................................................................................................................3

2. Electrical Characteristics ............................................................................................................................4

2.1 GS1881 Electrical Characteristics ...............................................................................................4

2.2 GS4881 Electrical Characteristics ...............................................................................................5

2.3 GS4981 Electrical Characteristics ...............................................................................................6

2.4 Typical Performance Characteristics .........................................................................................8

3. Temperature Characteristics .................................................................................................................. 11

4. Circuit Description..................................................................................................................................... 14

4.1 Composite Video Input (Pin 2) and Composite Sync Output (Pin 1) ............................. 14

4.2 Back Porch Output (Pin 5) ........................................................................................................... 15

4.3 Vertical Sync Output (Pin 3) ....................................................................................................... 16

4.4 Odd/Even Field Output (Pin 7 GS1881, GS4881) ................................................................ 16

4.5 Horizontal Output (Pin 7 GS4981) ............................................................................................ 17

4.6 Block Diagrams .............................................................................................................................. 17

5. Application Notes....................................................................................................................................... 20

5.1 Choosing the Appropriate Input Capacitor to Optimize Slicing Level and

Hum Rejection ....................................................................................................................................... 20

5.2 Filtering ............................................................................................................................................. 22

5.3 Deriving Odd/Even Using the GS4981 ................................................................................... 25

6. Ordering Information................................................................................................................................ 27

6.1 GS1881 Ordering Information .................................................................................................. 27

6.2 GS4881 Ordering Information .................................................................................................. 27

6.3 GS4981 Ordering Information .................................................................................................. 28

GS1881, GS4881, GS4981 Monolithic Video Sync

Separators

Data Sheet

6926 - 5

November 2009

2 of 29

Proprietary & Confidential

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