The LM2485 is a triple channel clamp amplifier used to DC restore the AC coupled outputs of a DTV CRT driver and for cut-off adjustment. The LM2485 also has an integrated blanking amplifier that can be used to drive the G1 grid of a CRT negative for vertical retrace blanking. The blanking output has a selectable pulse amplitude of either 20VP-P or 40VP-P via the Pin 13 option. The blanking input pulse can be generated from a vertical flyback pulse or by a microcontroller. The LM2485 can operate with a VCC supply of up to 220V and a VBB supply of either 8V or 12V. This VBB option, selectable via the Pin 12 option, ensures the LM2485 is compatible with any National Semiconductor DTV CRT driver sharing the same operating voltages in the application. The IC is packaged in an industry standard 24-lead molded plastic dual-in-line package to meet high voltage spacing requirements.