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GS4981

Gennum
Part Number GS4981
Manufacturer Gennum
Description Monolithic Video Sync Separators
Published Sep 28, 2016
Detailed Description GS1881, GS4881, GS4981 Monolithic Video Sync Separators Features • noise tolerant odd/even flag, back porch and horizon...
Datasheet PDF File GS4981 PDF File

GS4981
GS4981

Overview
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 ...


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