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GS1881 Dataheets PDF



Part Number GS1881
Manufacturers Gennum
Logo Gennum
Description Monolithic Video Sync Separators
Datasheet GS1881 DatasheetGS1881 Datasheet (PDF)

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 .

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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 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 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. 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 Changes and/or Modifications 5 November 2009 Updated to latest Gennum template and changed from document number 52023 to 6926. 4 July 2004 Added lead-free and green information. 3 – Revisions made. 2 – Revisions made. 1 March 1991 New document. 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) a.


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