GB4551 View Datasheet(PDF) - Gennum -> Semtech
Part Name
Description
Manufacturer
GB4551 Datasheet PDF : 5 Pages
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COMPOSITE
VIDEO INPUT
+10V
0.1
-10V
0.1
BORDER
INPUT FROM
(GB4551)
GT4123
7
VID B
5 VID A
1
OUT
GB4551
COMPOSITE
VIDEO INPUT
COLOR BURST
FILTER
0.1
42
6
10
1 GB4551 8
NON-POLAR
5
37
ROUT
470p
+5V
STROBE
TO OTHER
GB4551s
2
8
GS4881
SYNC. SEP.
4
5
6
680k
0.1
0.1
5V
0V
BACK
PORCH
PULSE
INSERT
BACKGROUND
VIDEO IN
(FROM GB4551)
KEY INPUT
3
CONTROL
STROBE
GT4123
7 VID B
5
VID A
OUT 1
3 CONTROL
GT4123
7
VID B
1
5 VID A
3 CONTROL
VIDEO
OUTPUT 1
VIDEO
OUTPUT 2
All resistors in ohms, all capacitors
in microfarads unless otherwise stated.
Fig. 7 GB4551 Driving Several GT4123 Video Mixers
APPLICATION CIRCUIT
The above circuit represents a possible use of the GB4551 as
an input back-porch clamp for video mixers in a simple
Production Switcher. For simplicity, the STROBE input is
derived from the GS4881 sync separator IC, driven from the
composite input signal.
The value of ROUT is chosen to roll-off the frequency response
of the GB4551. The value is usually between 15 and 47 ohms
depending on the total load capacitance seen by the device.
The GB4551 may be used anywhere in the circuit where
accurate DC restoration is required as shown by the second IC
following the output of the top GT4123.
DOCUMENT
IDENTIFICATION
PRODUCT PROPOSAL
This data has been compiled for market investigation purposes
only, and does not constitute an offer for sale.
ADVANCE INFORMATION NOTE
This product is in development phase and specifications are
subject to change without notice. Gennum reserves the right to
remove the product at any time. Listing the product does not
constitute an offer for sale.
PRELIMINARY DATA SHEET
The product is in a preproduction phase and specifications are
subject to change without notice.
DATA SHEET
The product is in production. Gennum reserves the right to make
changes at any time to improve reliability, function or design, in
order to provide the best product possible.
Gennum Corporation assumes no responsibility for the use of any circuits described herein and makes no representations that they are free from patent infringement.
© Copyright June 1992 Gennum Corporation. All rights reserved. Printed in Canada.
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