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GS1881-CDA

更新时间： 2024-11-07 07:02:03
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页数 文件大小 规格书
14页 282K
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Monolithic Video Sync Separators

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GS1881-CDA 数据手册

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GS1881, GS4881, GS4981  
Monolithic Video Sync Separators  
DATA SHEET  
FEATURES  
DESCRIPTION  
• noise tolerant odd/even flag, back porch and  
horizontal sync pulse  
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 130 kHz.  
• fast recovery from impulse noise  
• excellent temperature stability  
TheGS1881isadrop-inreplacementfortheindustrystandard  
LM1881 with much improved performance. The device  
generates composite sync, vertical sync, back porch and  
odd/evenfieldsignals. TheGS4881isidenticaltotheGS1881  
butfeaturesanoiseimmunebackporchpulsewhichmaintains  
a constant H rate during the vertical interval. The GS4981 is  
identicaltotheGS4881,exceptthatitprovideshorizontalsync  
in place of the odd/even output.  
• 0.5 V to 4 Vpp input signal amplitude with 5 V  
supply  
• well-controlled clamp discharge current and  
slicing level  
• programmable horizontal scan rate (up to 130 kHz)  
• composite, vertical, back porch, odd/even  
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.  
(GS1881, GS4881), horizontal (GS4981) outputs  
• predictable vertical output pulse width with  
default trigger for non-standard video signals  
• 5 V to 12 V supply voltage range  
• pin compatible with LM1881 sync separator  
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  
recoverquicklyfromimpulsenoisedisturbancesbytemporarily  
increasing the clamp discharge current by roughly ten times.  
The input stage will operate with signals from 0.5 to 4 volts  
peak to peak with a 5 volt supply.  
SELECTION CHART  
APPLICATION  
CHOOSE DEVICE:  
Direct LM1881 Replacement  
with Improved Performance  
GS1881  
The GS1881, GS4881 and GS4981 also feature a predictable  
verticaloutputpulsewidthwithadefaulttriggerfornon-standard  
video signals. All three are available in commercial and  
industrial temperature ranges and are packaged in both DIP  
and SOIC.  
New Applications  
Substitution for LM1881  
GS4881  
GS4981  
New Applications Requiring  
Horizontal Sync Output  
PIN CONNECTIONS  
GS4981  
GS1881, GS4881  
COMPOSITE  
COMPOSITE  
SYNC OUT  
V
8
7
6
5
1
2
3
4
V
8
7
6
5
1
2
3
4
SYNC OUT  
cc  
cc  
COMPOSITE  
VIDEO IN  
HORIZONTAL  
COMPOSITE  
VIDEO IN  
ODD/EVEN  
VERTICAL  
SYNC OUT  
VERTICAL  
SYNC OUT  
R
R
SET  
SET  
GROUND  
BACK PORCH  
GROUND  
BACK PORCH  
8 PIN DIP  
8 PIN SOIC  
8 PIN DIP  
8 PIN SOIC  
Patent No. 5,432,559  
Document No. 520 - 23 - 03  
Revision Date: October 1995  
GENNUM CORPORATION P.O. Box 489, Stn A, Burlington, Ontario, Canada L7R 3Y3 tel. (905) 632-2996 fax: (905) 632-2055  
Japan Branch: A-302 Miyamae Village, 2-10-42 Miyamae, Suginami-ku, Tokyo 168, Japan tel. (03) 3247-8838 fax (03) 3247-8839  
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