GB4550 & GB4550A
Monolithic Video Buffer/Clamp
DATA SHEET
FEATURES
DESCRIPTION
• adjustable clamp level from -5.5 V to +5.5 V at ±10 V
The GB4550 and GB4550A are high performance mono-
lithic video buffer/clamps made on Gennum's LSI process.
They feature 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 connected to the output.
supplies.
• ultra low differential gain (0.02% typ.) and
differential phase (0.03° typ.)
• wideband unity gain: GB4550 ±0.2 dB at 25 MHz
GB4550A ±0.1 dB at 25 MHz
• both drive 150pF loads at full power, flat to 10 MHz.
• GB4550A — tight delay spread of ±0.15°at colorburst.
• convenient 8 pin SIP packaging.
The clamping level can be set for normal sync tip clamping
by connecting pin 4 to -0.286 volts. For other applications,
the clamping voltage level can be varied from -5.5 to +5.5
volts.
• both can be configured as a gain stage with reduced
The GB4550A features a tight delay spread of only ±0.ꢀ5
degrees while the GB4550 maintains a ±ꢀ.5 degree delay
spread. Both devices operate from ±± to ±ꢀ2 V power
supplies and will directly interface with Gennum's video
crosspoint switches.
bandwidth.
• Pb-free and Green
PIN CONNECTIONS
The 8 pin SIP package is ideally suited for space restricted
board layouts.
GB4550 and GB4550A
APPLICATIONS
• Input buffering and clamping to crosspoint switches
• Inter - system video signal clamping
ꢀ
2
3
4
5
6
7
8
CX
(+2 V OUTPUT CLAMP)
Pin No. GB4550
GB4550A
+IN
Function
100k
ꢀ
2
3
4
5
6
7
8
+IN
VCC
COMP
VCL
non-inverting input
positive power supply
frequency compensation or NC
clamp voltage input
external capacitor
negative power supply
inverting input
30k
V
CL
(NC on
GB4550A)
COMP
VCC
+
-
10pF
NC
VCL
+IN
-IN
+
-
CX
CX
30k
VEE
VEE
VCC
-IN
-IN
OUT
OUT
output
OUT
7mA
Nominal
VEE
All resistors in ohms, all capacitors in microfarads unless otherwise stated
ORDERING INFORMATION
SIMPLIFIED CIRCUIT DIAGRAM
Part Number
Package Type Temperature Range
Pb-free and Green
o
GB4550 - CSA
GB4550ACSA
GB4550 - CSAE3
8 pin SIP
8 pin SIP
8 pin SIP
0 to 70 C
No
o
0 to 70 C
No
o
0 to 70 C
Yes
Revision Date: July 2004
Document No. 520 - 34 - 5
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