LM1238AADNA National Semiconductor, LM1238AADNA Datasheet

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LM1238AADNA

Manufacturer Part Number
LM1238AADNA
Description
DIP-24
Manufacturer
National Semiconductor
Datasheet

Specifications of LM1238AADNA

Date_code
03+
© 2003 National Semiconductor Corporation
LM1238
110 MHz I
Simple OSD Generator and 4 DACs
General Description
The LM1238 pre-amp is an integrated, three channel video
pre-amp. It has an I2C compatible interface which allows
control of all the parameters necessary to directly setup and
adjust the gain and contrast in the CRT display. Four I2C
compatible DACs are available to control monitor bias and
brightness circuits. The LM1238 preamp is designed to be
100% compatible with the LM246x high gain driver family
and the LM2479/80 Clamp ICs.
Black level clamping of the video signal is carried out directly
on the AC coupled input signal into the high impedance
pre-amplifier inputs, eliminating the need for additional
clamp capacitors. Horizontal and vertical blanking of the
outputs is provided. Vertical blanking is optional and its
duration is register programmable.
Features
n I
n Internal OSD generator with 16 sets of color icons
Block and Connection Diagram
2
C compatible microcontroller interface
2
C Compatible RGB Preamplifier with Internal
FIGURE 1. Order Number LM1238AAC/NA
DS200387
See NS Package Number N24D
n OSD override allows OSD messages to be displayed
n Internally generated burn-in screen
n 4 DAC outputs (8-bit resolution) for bus controlled CRT
n Spot killer which blanks the video outputs when V
n Suitable for use with discrete or integrated clamp, with
n H and V blanking (V blanking is optional and has
n Power Saving Mode with 65% power reduction
n Matched to LM246x driver and 2479/80 clamp
Applications
n Low end 15" and 17" bus controlled monitors with OSD
n 1024x768 displays up to 85 Hz requiring OSD capability
n Very low cost systems with LM246x driver
while blanking input video
bias and brightness
falls below the specified threshold
software configurable brightness mixer
register programmable width)
20038701
www.national.com
June 2003
CC

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