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What is GB4551?

This electronic component, produced by the manufacturer "Gennum", performs the same function as "Video Buffer".


GB4551 Datasheet PDF - Gennum

Part Number GB4551
Description Video Buffer
Manufacturers Gennum 
Logo Gennum Logo 


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GB4551 Video Buffer with
Strobed DC Restore
DATA SHEET
FEATURES
accurate clamping to within ±1mV
ultra low differential gain (0.03% typ.)
and differential phase (0.03o typ.)
wideband unity gain, can typically be flattened to
±0.1dB at 30MHz
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can be configured as a gain stage with reduced
bandwidth.
drives 100pF loads
convenient 8 pin SIP packaging
PIN CONNECTIONS
GB4551
1 2 3 4 5 67 8
Pin No.
1
2
3
4
5
6
7
8
GB4551
+IN
VCC
STB
GND
CX
VEE
- IN
OUT
Function
non-inverting input
positive power supply
strobe
ground
external capacitor
negative power supply
inverting input
output
ORDERING INFORMATION
Part Number
GB4551-CSA
Package Type
8 Pin SIP
Temperature Range
0 to 70o C
DESCRIPTION
The GB4551 is a high performance video buffer with DC
restore primarily used for accurate back porch clamping.
The circuit features a wideband differential amplifier that
can be configured as a gain stage. The output signal
voltage is limited to +2V above the clamp level in order to
prevent damage to crosspoints or other circuits connected
to the output.
The clamping action occurs when the STROBE (STB)
input is taken to ground. A typical application would be for
DC restoration during the back porch period. In this case
the negative-going back porch pulse would be derived
from an external sync separator circuit.
The GB4551 will operate from ± 9V to ±12V power supplies
and will directly interface with Gennum’s video crosspoint
switches. The 8 pin SIP package is ideally suited for
space restricted board layouts.
APPLICATIONS
• Input buffering and DC restoration to crosspoint switches
• Accurate back porch video signal clamping
• Inter-circuit buffering and DC restoration.
CX
+IN
500
–IN
30k
+
-
(+2V OUTPUT CLAMP)
10k
+
12pF
-
10k
STROBE
VEE
7mA
NOM.
VCC
All resistors in ohms, all capacitors in microfarads unless otherwise stated.
SIMPLIFIED CIRCUIT DIAGRAM
OUT
GND
Document No. 520 - 52 - 2
GENNUM CORPORATION P.O. Box 489, Stn A, Burlington, Ontario, Canada L7R 3Y3 tel. (905) 632-2996 fax: (905) 632-2055
Japan Branch: B-201 Miyamae Village, 2-10-42 Miyamae, Suginami-ku Tokyo 168, Japan tel. (03) 3247-8838 fax: (03) 3247-8839

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GB4551 equivalent
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
42
6
10
1 GB4551
NON-POLAR
53
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0.1
470p
+5V
2
GS4881
SYNC. SEP.
8
0.1
4
6
5
5V
0V
680k
BACK
0.1 PORCH
PULSE
ROUT
8
7
STROBE
TO OTHER
GB4551s
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
5 VID A
3 CONTROL
1
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.
5 520 - 52 - 2


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