GB4570 Datasheet, PDF (1/5 Pages) Gennum Corporation – Monolithic Video Buffer/Clamp

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
1
8
V_IN
2
7
V_CLAMP
3
6
C_HOLD
4
5
V_CC
V_OUT
V_EE
NC
AVAILABLE PACKAGING
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
8 pin PDIP
8 pin SOIC
V_IN
2
COUPLING
CAP
ORDERING INFORMATION
Part Number Package
GB4570-CDA 8 pin PDIP
Temperature Range
0° to 70°C
GB4570-CKA 8 pin SOIC
0° to 70°C
GB4570-CTA 8 pin SOIC Tape 0° to 70°C
-
50k
+
4
C_HOLD
7 V_OUT
6 V_EE
3 V_CLAMP
Document No. 521 - 18 - 01
GENNUM CORPORATION P.O. Box 489, Stn A, Burlington, Ontario, Canada L7R 3Y3 tel. [phone] fax: [phone]
Japan Branch: A-302, Miyamae Village, 2-10-42, Miyamae, Suginami-ku, Tokyo 168, Japan tel. [phone] fax. [phone]