GB4570 Monolithic
Video Buffer/Clamp
DATA SHEET
FEATURES
•
accurate sync tip clamping (
±
2 mV typical)
•
less than 1 mV clamping distortion
•
variable clamping voltage (V
EE
+ 3 V to V
CC
-4.5 V)
•
ultra low differential gain and differential phase
•
less than
±
0.15
°
phase delay variation at 3.58 MHz
•
±
0.1 dB flatness to 80 MHz
•
±
4.5 to
±
13.2 V supply voltage range
DESCRIPTION
The GB4570 is a high performance video buffer/clamp used
primarily for sync tip clamping of video signals. Key features
include operation from
±
4.5 to
±
13.2 V supply voltages,
±
0.1
dB flatness to 80 MHz and availability of industry standard DIP
and SOIC packages.
In a typical video application, the GB4570 clamps the sync tip
to a known voltage. The clamping level can be set for normal
sync tip clamping by connecting pin 3 to - 0.286 volts. For
applications requiring non-standard sync tip clamping, the
clamping voltage applied to pin 3 may be varied.
The GB4570 features a tight delay spread of only
±
0.15° at
color burst frequencies and less than
±
1 millivolts clamping
distortion.
PIN CONNECTIONS
GB4570
GND
V
IN
V
CLAMP
C
HOLD
1
2
3
4
8
7
6
5
V
CC
V
OUT
V
EE
NC
APPLICATIONS
•
•
•
Sync tip clamping of NTSC, PAL, SECAM and RGB
Video Signals
Input buffering and clamping
Inter-system video signal clamping
SIMPLIFIED CIRCUIT DIAGRAM
V
CC
8
AVAILABLE PACKAGING
8 pin PDIP
8 pin SOIC
V
IN
COUPLING
CAP
2
7 V
OUT
ORDERING INFORMATION
Part Number
Package
Temperature Range
6
-
50k
+
V
EE
GB4570-CDA
GB4570-CKA
GB4570-CTA
8 pin PDIP
8 pin SOIC
0° to 70°C
0° to 70°C
3 V
CLAMP
8 pin SOIC Tape 0° to 70°C
4
C
HOLD
Document No. 521 - 18 - 01
GENNUM CORPORATION P.O. Box 489, Stn A, Burlington, Ontario, Canada L7R 3Y3 tel. (905) 632-2996 fax: (905) 632-2055
Japan Branch: A-302, Miyamae Village, 2-10-42, Miyamae, Suginami-ku, Tokyo 168, Japan
tel. (03) 3247-8838
fax. (03) 3247-8839