GB4551

GB4551 Video Buffer with Strobed DC Restore DATA SHEET 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 www.DataSheet4U.com 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. GB4551 APPLICATIONS Input buffering and DC restoration to crosspoint switches 1 2 3 4 5 6 7 8 Accurate back porch video signal clamping Inter-circuit buffering and DC restoration. can be configured as a gain stage with reduced bandwidth. drives 100pF loads convenient 8 pin SIP packaging PIN CONNECTIONS Pin No. 1 2 3 4 5 6 7 8 GB4551 +IN VCC STB GND CX VEE - IN OUT Function non-...