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LM2485 Datasheet

  • LM2485

  • National Semiconductor [220V Triple Bias Clamp with G1 Blan...

  • NSC

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LM2485 220V Triple Bias Clamp with G1 Blank Amplifier
December 2004
LM2485
220V Triple Bias Clamp with G1 Blank Amplifier
General 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 20V
P-P
or
40V
P-P
via the Pin 13 option. The blanking input pulse can
be generated from a vertical flyback pulse or by a microcon-
troller.
The LM2485 can operate with a V
CC
supply of up to 220V
and a V
BB
supply of either 8V or 12V. This V
BB
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 applica-
tion.
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
V
CC
capable of up to 220V
V
BB
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 20V
P-P
or 40V
P-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
20103433
FIGURE 1. Top View
Order Number LM2485NA
See NS Package Number N24C
漏 2004 National Semiconductor Corporation
DS201034
www.national.com

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