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GB4551 Datasheet(PDF) 1 Page - Gennum Corporation

Part # GB4551
Description  Video Buffer with Strobed DC Restore
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Manufacturer  GENNUM [Gennum Corporation]
Direct Link  http://www.gennum.com
Logo GENNUM - Gennum Corporation

GB4551 Datasheet(HTML) 1 Page - Gennum Corporation

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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
• can be configured as a gain stage with reduced
bandwidth.
• drives 100pF loads
• convenient 8 pin SIP packaging
Pin No.
GB4551
Function
1
+IN
non-inverting input
2V
CC
positive power supply
3
STB
strobe
4
GND
ground
5C
X
external capacitor
6V
EE
negative power supply
7
- IN
inverting input
8
OUT
output
ORDERING INFORMATION
Part Number
Package Type
Temperature Range
GB4551-CSA
8 Pin SIP
0 to 70o C
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
DATA SHEET
GB4551 Video Buffer with
Strobed DC Restore
Document No. 520 - 52 - 2
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.
VCC
500
10k
–IN
OUT
CX
30k
+IN
VEE
STROBE
12pF
10k
GND
(+2V OUTPUT CLAMP)
7mA
NOM.
+
-
+
-
SIMPLIFIED CIRCUIT DIAGRAM
All resistors in ohms, all capacitors in microfarads unless otherwise stated.
PIN CONNECTIONS
1
2
3
4
5
6
7
8
GB4551


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