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参数资料
| 型号： | LM1253AAE/NA |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | 画面叠加 |
| 英文描述： | ON-SCREEN DISPLAY IC, PDIP28 |
| 封装： | 0.600 INCH, PLASTIC, DIP-28 |
| 文件页数： | 16/61页 |
| 文件大小： | 1671K |
| 代理商： | LM1253AAE/NA |
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OSD Generator Operation
Page Operation
The block diagram of the OSD generator is shown
Figure 32.
Video information is created using any of the 256 pre-
defined characters stored in the mask programmed ROM.
Each character has a unique 8 bit code that is used as its
address. Consecutive rows of characters make up the dis-
played window. These characters can be stored in the page
RAM, written under I
2C controlled commands by the monitor
micro-controller. Each row can contain any number of char-
acters up to the limit of the displayable line length, although
some restrictions concerning the enhanced features apply
on character rows longer than 32 characters
The number of characters across the width and height of the
page can be varied under I
2C control, but the total number of
characters that can be stored and displayed on the screen is
limited to 512 including any row end, skip line, and window
end control characters. The horizontal and vertical start po-
sition can also be programmed under I
2C control.
OSD Video DAC
The OSD DAC is controlled by the 9 bit (3x9 bits) OSD video
information coming from the pixel serializer look-up table.
The OSD DAC is shown in the
Figure 33, where the gain is
programmable by the 2 bit OSD CONTRAST register, in 4
stages to give the required OSD signal.
The analog signal created by the OSD DACs is biased with
respect to V
REF.
DS101265-36
FIGURE 32. Block Diagram of the OSD Generator
DS101265-37
FIGURE 33. Block Diagram of OSD DACs
LM1253A
www.national.com
23
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LM1253AN | 制造商:NSC 制造商全称:National Semiconductor 功能描述:Monolithic Triple 180 MHz I2C CRT Pre-amp With Integrated Analog On Screen Display (OSD) Generator |
| LM-1256 | 制造商:ROHM 制造商全称:Rohm 功能描述:16 x 16 matrix displays |
| LM-1256_1 | 制造商:ROHM 制造商全称:Rohm 功能描述:16】16 matrix displays |
| LM-1256LB1 | 制造商:ROHM 制造商全称:Rohm 功能描述:16】16 matrix displays |
| LM125AN | 制造商:NSC 制造商全称:National Semiconductor 功能描述:VOLTAGE REGULATORS |
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