GS4882
Video Sync Separators with 50% Sync Slicing

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The  GS4882 and GS4982 are precision sync separators for extracting timing information from NTSC, PAL, and SECAM video signals.  The GS4882 generates noise immune and temperature stable composite sync, vertical sync, back porch and odd/even field signals.  The GS4982 provides a horizontal sync output for those applications requiring horizontal sync extraction.

The GS4882 and GS4982 feature  an internal color burst filter for minimization of spurious timing information and the reduction of external component count.  The precision 50% sync slicing feature embodied in the device provides for superior sync extraction in the presence of noise and varying sync pulse amplitudes.  The high performance dual mode input clamp aids in maintaining the accuracy of the internally derived 50% sync slicing level to within ±5% as well in reducing system start-up/recovery time.  In addition, a missing pulse detector enables the devices to quickly respond to  impulse noise by temporarily turning on a Nosync Recovery Current connected to the dual mode input clamp.  The input stage will operate with input signal amplitudes ranging from +0.5 to +4.0V  peak to peak with a +5V supply voltage.

The GS4882 and GS4982 have robust signal detection and output muting circuitry.  Should valid video be removed  from the device input, the absence of video will be automatically detected and all outputs muted to a logic high state after a defined probation period.  Upon the return of a valid video signal, device outputs are enabled after receiving 8 lines of video.  An internal frequency to voltage converter also allows the device to differentiate between valid and invalid input signals by analyzing the horizontal scan rate of the input signal and comparing it against  the expected input signal scan rate.

The GS4882 and GS4982 are available in standard 8 pin PDIP and SOIC packages, operate with a + 4.5 to +13.2 volt supply voltage range and typically consume less than 6 mA of current with a +5 V supply voltage.
PARAMETER VALUE / UNITS
Supply Voltage +13.5 V
Operating Temperature Range 0°C ≤ TA ≤ 70°C
Storage Temperature Range -65°C ≤ TS ≤150°C
Lead Temperature (soldering, 10 seconds) 260°C
• precision 50% sync slicing
• internal color burst filter
• ±5 ns temperature stability
• superior noise immunity
• robust signal detection/output muting circuitry
• high performance dual mode input clamp
• 0.5 V to 4.0 Vpp input signal with +5 V supply
• composite, vertical, back porch, odd/even outputs
• horizontal sync output available with GS4982
• +4.5 V to +13.2 V supply voltage range
• Pb-free and Green

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Datasheet

Size: 85.5KB
Page: 7
PDF: GS4882.pdf
  • Description:
    Video Sync Separators with 50% Sync Slicing
  • MFG:
    GENNUM [Gennum Corporation]
 

Abstract


Document No. 521 - 61 - 01
DATA SHEET
GENNUM CORPORATION P.O. Box 489, Stn A, Burlington, Ontario, Canada L7R 3Y3 tel. (905) 632-2996 fax: (905) 632-5946
Gennum Japan: Shinjuku Green Tower Building 27F 6-14-1, Nishi Shinjuku Shinjuku-ku, Tokyo 160-0023 Japan Tel: +81 (03) 3349-5501 Fax: +81 (03) 3349-5505
Patent Pending.
GS4882, GS4982 Video Sync
Separators with 50% Sync Slicing
FEATURES DESCRIPTION
The GS4882 and GS4982 are precision sync separators for
extracting timing information from NTSC, PAL, and SECAM
video signals. The GS4882 generates noise immune and
temperature stable composite sync, vertical sync, back porch
and odd/even field signals. The GS4982 provides a horizontal
sync output for those applications requiring horizontal sync
extraction.
The GS4882 and GS4982 feature an internal color burst filter
for minimization of spurious timing information and the reduction
of external component count. The precision 50% sync slicing
feature embodied in the device provides for superior sync
extraction in the presence of noise and varying sync pulse
amplitudes. The high performance dual mode input clamp
aids in maintaining the accuracy of the internally derived 50%
sync slicing level to within ±5% as well in reducing system
start-up/recovery time. In addition, a missing pulse detector
enables the devices to quickly respond to impulse noise by
temporarily turning on a Nosync Recovery Current connected
to the dual mode input clamp. The input stage will operate with
input signal amplitudes ranging from +0.5 to +4.0V peak to
peak with a +5V supply voltage.
The GS4882 and GS4982 have robust signal detection and
output muting circuitry. Should valid video be removed from
the device input, the absence of video will be automatically
detected and all outputs muted to a logic high state after a
defined probation period. Upon the return of a valid video
signal, device outputs are enabled after receiving 8 lines of
video. An internal frequency to voltage converter also allows
the device to differentiate between valid and invalid input
signals by analyzing the horizontal scan rate of the input signal
and comparing it against the expected input signal scan rate.
The GS4882 and GS4982 are available in standard 8 pin PDIP
and SOIC packages, operate with a + 4.5 to +13.2 volt supply
voltage range and typically consume less than 6 mA of current
with a +5 V supply voltage.
? precision 50% sync slicing
internal color burst filter
±5 ns temperature stability
superior noise immunity
robust signal detection/output muting circuitry
high performance dual mode input clamp
0.5 V to 4.0 Vpp input signal with +5 V supply
composite, vertical, back porch, odd/even outputs
horizontal sync output available with GS4982
+4.5 V to +13.2 V supply voltage range
Pb-free and Green
R
SET
GROUND
V
cc
VERTICAL
SYNC OUT
1
2
3
4
8
7
6
5
GROUND
V
cc
1
2
3
4
8
7
6
5
GS4882
VERTICAL
SYNC OUT
R
SET
GS4982
ODD/EVEN
BACK PORCH
BACK PORCH
ODD/EVEN
PIN CONNECTIONS
COMPOSITE
SYNC OUT
COMPOSITE
VIDEO IN
HORIZONTAL
COMPOSITE
VIDEO IN
Revision date: July 2004
Part Number Package Temperature Pb-Free
Type Range and Green
GS4882-CDA 8 pin PDIP 0° C to 70° C No
GS4882-CKA 8 pin SOIC 0° C to 70° C No
GS4882-CTA 8 pin SOIC Tape 0° C to 70° C No
GS4982-CDA 8 pin PDIP 0° C to 70° C No
GS4982-CKA 8 pin SOIC 0° C to 70° C No
GS4982-CTA 8 pin SOIC Tape 0° C to 70° C No
GS4882-CKAE3 8 pin SOIC 0° C to 70° C Yes
GS4982-CKAE3 8 pin SOIC 0° C to 70° C Yes
ORDERING INFORMATION

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