LM1267 150 MHz I
2
C Compatible RGB Video Amplifier System with OSD and DACs
May 2002
LM1267
150 MHz I
2
C Compatible RGB Video Amplifier System
with OSD and DACs
General Description
The LM1267 pre-amp is an integrated CMOS CRT pre-amp.
The IC is I
2
C compatible, and allows control of all the pa-
rameters necessary to directly setup and adjust the gain and
contrast in the CRT display. Brightness and bias can be
controlled through the DAC outputs, and is well matched to
the LM2479 and LM2480 integrated bias clamp IC.
The LM1267 pre-amp is designed to work in cooperation
with the LM246X high gain driver family.
Black level clamping of the signal is carried out directly on
the AC coupled input signal into the high impedance pream-
plifier input, thus eliminating the need for additional black
level clamp capacitors.
The IC is packaged in an industry standard 24-lead DIP
molded plastic package.
n
Programmable 110 MHz to 150 MHz bandwidth
preamplifier with full video signal parametric control
n
4 external 8-bit DACs for bus controlled Bias and
Brightness
n
Suitable for use with discrete or integrated clamp, with
software configurable Brightness mixer
n
Power Save (Green) Mode, 80% power reduction
n
Matched to LM246X driver
Applications
n
Low end 15’ and 17’ bus controlled monitors with OSD
n
1024 X 768 displays up to 85 Hz requiring OSD
capability
n
Very low cost system with LM246X driver
Features
n
I
2
C compatible interface
Block and Connection Diagram
DS200050-1
FIGURE 1. Order Number LM1267NA
See NS Package Number N24D
© 2002 National Semiconductor Corporation
DS200050
www.national.com
NSC [ NATIONAL SEMICONDUCTOR ]
