GS4882 Datasheet, PDF (1/7 Pages) Gennum Corporation – Video Sync Separators with 50% Sync Slicing

GS4882, GS4982 Video Sync
Separators with 50% Sync Slicing
FEATURES
• 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
ORDERING INFORMATION
Part Number
GS4882-CDA
GS4882-CKA
GS4882-CTA
GS4982-CDA
GS4982-CKA
GS4982-CTA
GS4882-CKAE3
GS4982-CKAE3
Package
Type
8 pin PDIP
Temperature
Range
0° C to 70° C
8 pin SOIC
0° C to 70° C
8 pin SOIC Tape 0° C to 70° C
8 pin PDIP
0° C to 70° C
8 pin SOIC
0° C to 70° C
8 pin SOIC Tape 0° C to 70° C
8 pin SOIC
0° C to 70° C
8 pin SOIC
0° C to 70° C
Pb-Free
and Green
No
No
No
No
No
No
Yes
Yes
DATA SHEET
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.
PIN CONNECTIONS
GS4882
COMPOSITE
SYNC OUT
1
8
COMPOSITE
VIDEO IN
2
7
VERTICAL
SYNC OUT
3
6
GROUND
4
5
V_cc
ODD/EVEN
R_SET
BACK PORCH
GS4982
HORIZONTAL 1
8
COMPOSITE
VIDEO IN
2
7
VERTICAL ₃
6
SYNC OUT
GROUND
4
5
V_cc
ODD/EVEN
R_SET
BACK PORCH
Revision date: July 2004
Patent Pending.
Document No. 521 - 61 - 01
GENNUM CORPORATION P.O. Box 489, Stn A, Burlington, Ontario, Canada L7R 3Y3 tel. [phone] fax: [phone]
Gennum Japan: Shinjuku Green Tower Building 27F 6-14-1, Nishi Shinjuku Shinjuku-ku, Tokyo 160-0023 Japan Tel: [phone] Fax: [phone]