GB4570

Features:

• accurate sync tip clamping (± 2 mV typical)
• less than 1 mV clamping distortion
• variable clamping voltage (VEE + 3 V to VCC -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




Application

• Sync tip clamping of NTSC, PAL, SECAM and RGB Video Signals
• Input buffering and clamping
• Inter-system video signal clamping




Pinout






Specifications

PARAMETER	VALUE/UNITS
Supply Voltage Operating Temperature Range Storage Temperature Range Lead Temperature (soldering, 10 seconds) Differential Video Input Voltage Strobe Input Voltage	±13.5 V 0°C TA 70°C -65°C TS150°C 260°C ±5 V -VS VSTROBE+VS

Description


The GB4570 is a high performance video buffer/clamp used primarily for sync tip clamping of video signals. Key features of GB4570 include operation from ± 4.5 to ±13.2V supply voltages, ±0.1dB flatness to 80MHz 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. GB4570 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.