LM2485 Datasheet | National Semiconductor

Description 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 patible 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. Features n n n n VCC capable of up to 220V VBB selectable to 8V or 12V via Pin 12 option Wide bias output voltage range of over 100V Inverted output pulse suitable for G1 blanking, selectable to 20VP-P or 40VP-P via Pin 13 option Applications n AC coupled CRT applications using DTV formats up to 1080i n Well-matched to the NSC LM12XX Family of Preamplifiers and LM242X/3X/5X Family of DTV CRT Drivers Pinout and Internal Block Diagram FIGURE 1. Top View Order Number LM2485NA See NS Package Number N24C © 2004 National Semiconductor Corporation DS201034 .national. Absolute Maximum Ratings 3) (Notes 1, Max Junction Temperature θJA (Max at 0 LFPM) 150˚C 68˚C/W If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Supply Voltage, VCC Bias Voltage, VBB Input Voltage, VIN Blanking Input Voltage, VBIN Storage Temperature Range, TSTG Lead Temperature (Soldering, < 10sec.) ESD Tolerance Human Body Model Machine Model 2 k V 200V 250V 15V -0.5V to +6.5V -0.5V to +6.5V...