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LM1253AN

更新时间： 2024-09-22 22:34:27
品牌 Logo 应用领域
美国国家半导体 - NSC 消费电路商用集成电路叠加集成电路放大器光电二极管监视器
页数 文件大小 规格书
57页 1622K
描述
Monolithic Triple 180 MHz I2C CRT Pre-amp With Integrated Analog On Screen Display (OSD) Generator

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中文翻译

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LM1253AN 技术参数

是否Rohs认证： 不符合生命周期：Obsolete
包装说明：DIP, DIP28,.6Reach Compliance Code：unknown
风险等级：5.92Is Samacsys：N
应用：MONITOR字符数组大小：12 X 18
商用集成电路类型：ON-SCREEN DISPLAY IC锁定直播画面：NO
JESD-30 代码：R-PDIP-T28JESD-609代码：e0
长度：35.725 mm背景颜色数量：1
功能数量：1端子数量：28
最高工作温度：70 °C最低工作温度：
封装主体材料：PLASTIC/EPOXY封装代码：DIP
封装等效代码：DIP28,.6封装形状：RECTANGULAR
封装形式：IN-LINE峰值回流温度（摄氏度）：NOT SPECIFIED
电源：5 V认证状态：Not Qualified
座面最大高度：5.334 mm子类别：Audio/Video Amplifiers
最大供电电压 (Vsup)：5.25 V最小供电电压 (Vsup)：4.75 V
表面贴装：NO技术：CMOS
温度等级：COMMERCIAL端子面层：Tin/Lead (Sn/Pb)
端子形式：THROUGH-HOLE端子节距：2.54 mm
端子位置：DUAL处于峰值回流温度下的最长时间：NOT SPECIFIED
宽度：15.24 mmBase Number Matches：1

LM1253AN 数据手册

 浏览型号LM1253AN的Datasheet PDF文件第2页浏览型号LM1253AN的Datasheet PDF文件第3页浏览型号LM1253AN的Datasheet PDF文件第4页浏览型号LM1253AN的Datasheet PDF文件第5页浏览型号LM1253AN的Datasheet PDF文件第6页浏览型号LM1253AN的Datasheet PDF文件第7页 
May 2000  
LM1253A  
Monolithic Triple 180 MHz I2C CRT Pre-amp With  
Integrated Analog On Screen Display (OSD) Generator  
The outputs are referenced to a DC level produced by the  
LM1253A Pre-amp, and so are guaranteed to provide stable  
General Description  
The LM1253A pre-amp is an integrated high voltage triple  
DC operating levels within the system without the need for  
CRT pre-amp and Analog On Screen Display (OSD) genera-  
additional external feedback components.  
tor. The IC is I2C controlled, and allows control of all the pa-  
The IC is packaged in an industry standard wide body 28-  
rameters necessary to setup and adjust the brightness and  
lead DIL molded plastic package.  
contrast in the CRT display. In addition, it provides a pro-  
grammable period vertical blanking pulse which is used to  
blank the G1.  
Features  
n 190 two-color ROM based Character Fonts  
n 64 four-color ROM based Character Fonts  
n Supports a programmable page size with up to 512  
characters and line definition codes  
n Support for 2 Display Windows (size of each window is  
configurable)  
n Programmable start position for each Display Window  
n Programmable Resolutions: from 512 to 960 pixels per  
line in 64 pixel increments  
n Programmable Character Height, with automatic height  
control with mode change  
The LM1253A pre-amp is designed to work in cooperation  
with the LM2453 driver, and provides a multiplexed video  
signal (VideoPlex) interface to enable the DC clamp levels at  
the cathode to be varied in order to set up the CRT bias and  
to allow individual adjustment for brightness.  
The Analog OSD has a selectable palette allowing a wide se-  
lection of colors. The preset level of the OSD can be con-  
trolled by I2C to suit different CRT displays. The OSD signal  
is internally mixed with the video signal, before the gain sec-  
tion, and thus gives excellent white tracking of the OSD with  
the white color point setting of the video.  
The Brightness settings are also mixed into the video signal  
before the gain matching controls and consequently give ex-  
cellent white color point tracking with variations in the Bright-  
ness control. An active horizontal blanking signal is added to  
the video at the output, giving excellent smear performance,  
and preventing video content dependent DC bias offsets as  
a result of high frequency over shoot.  
n Programmable Row Spacing between each display  
character row  
n Maximum Pixel clock of 92.2 MHz  
n I2C compatible interface to controlling micro-controller  
n Button boxes  
n 180 MHz preamplifier with full video signal parametric  
control  
The OSD horizontal sync and blanking signal is derived from  
a positive going flyback pulse. The digital section provides  
easy interfacing of this signal with the deflection circuits.  
™
n VideoPlex interface to the LM2453 driver  
n OSD mixing with 64 out of 512 color mask  
programmable selection  
The vertical blanking signal is taken from the vertical sync  
signal, and the blanking duration is programmable. This sys-  
tem is highly integrated and requires a minimal number of  
external components.  
Intended Applications  
n 1280 x 1024 Displays up to 75 Hz requiring OSD  
capability  
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.  
© 2000 National Semiconductor Corporation  
DS101265  
www.national.com  
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