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LM1276

更新时间: 2024-11-12 04:19:19
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美国国家半导体 - NSC 放大器
页数 文件大小 规格书
50页 2619K
描述
150 MHz I2C Compatible RGB Preamplifier with Internal 512 Character OSD ROM, 512 Character RAM and 4 DACs

LM1276 数据手册

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May 2005  
LM1276  
150 MHz I2C Compatible RGB Preamplifier with Internal  
512 Character OSD ROM, 512 Character RAM and 4  
DACs  
n Enhanced I2C compatible microcontroller interface to  
allow versatile Page RAM access.  
n OSD Window Fade In/Fade Out.  
n OSD Variable Tone Transparency.  
General Description  
The LM1276 pre-amp is an integrated CMOS CRT preamp  
with an integrated Hi-Brite Window generator, 512 Character  
OSD generator, and an auto size measurement circuit. It has  
n 3 Bit OSD Contrast.  
an I2C compatible interface, which allows control of all the  
n Video Data detection for Auto Centering & Sizing.  
n 2 Bit Adjustable Burn-in screen Mode with no video  
input.  
n 4 DAC outputs (8-bit resolution) for bus controlled CRT  
bias and brightness.  
parameters necessary to directly setup and adjust the gain  
and contrast in the CRT display. Brightness and bias can be  
controlled through the DAC outputs, which are well matched  
to the LM2479 and LM2480 integrated bias clamp ICs. The  
LM1276 preamp is also designed to be compatible with the  
LM247x high gain driver family.  
n Spot killer, which blanks the video outputs when VCC  
falls below the specified threshold.  
Black level clamping of the video signal is carried out directly  
on the AC coupled input signal into the high impedance  
preamplifier input, thus 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.  
n Suitable for use with discrete or integrated clamp, with  
software configurable brightness mixer.  
n Programmable ABL Onset for Multi-Limit Applications.  
n 4-Bit Programmable start position for internal Horizontal  
Blanking.  
The IC is packaged in an industry standard 28-lead narrow  
DIP molded plastic package.  
n Horizontal blanking and OSD synchronization directly  
from deflection signals. The blanking can be disabled, if  
desired.  
n Vertical blanking and OSD synchronization directly from  
sync signals. The blanking width is register  
programmable and can be disabled, if desired.  
n Power Saving Mode with 65% power reduction.  
n Matched to LM246x, LM247x drivers, and LM2479/80  
bias IC’s.  
Features  
n Integrated Hi-Brite Window Generator operation  
independent of the Microcontroller.  
n Programmable Video Emphasis Control.  
n 8 Programmable Hi-Brite Windows.  
n Hi-Brite Enhancement on full screen, window only, or  
outside of windows.  
Applications  
n Fully addressable 512 Character OSD.  
n Internal 512 character OSD ROM usable as either (a)  
384 2-color plus 128 4-color characters, (b) 640 2-color  
characters, or (c) some combination in between.  
n Internal 512 character RAM.  
n Ideal preamplifier IC for total Hi-Brite Solution.  
n 17" and 19” bus controlled monitors with OSD.  
n Low cost systems with LM247x drivers.  
© 2005 National Semiconductor Corporation  
DS200969  
www.national.com  

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