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參數資料
| 型號： | LM1276 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | 150 MHz I2C Compatible RGB Preamplifier with Internal 512 Character OSD ROM, 512 Character RAM and 4 DACs |
| 中文描述： | 150 MHz的I2C兼容的RGB前置放大器512個字符OSD光盤，512個字符RAM和4 DAC的內置 |
| 文件頁數： | 23/50頁 |
| 文件大小： | 2597K |
| 代理商： | LM1276 |
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OSD Generator Operation
PAGE OPERATION
Figure 16
shows the block diagram of the OSD generator.
OSD screens are created using any of the 512 predefined
characters stored in the mask programmed ROM. The
LM1276 offers a full 9-bit character code operation, which
allows the entire 512 ROM character set to be displayed at
once. The 9-bit character code operation enables all 512
character addresses to be independently accessed on one
page.
OSD ROM CONFIGURATION
The OSD ROM is equivalent to two 256 character ROMs of
the type used in the LM1253A and LM1237. Each ROM can
be considered as a group of 3 banks, (192) two-color char-
acters followed by 1 bank (64) four-color characters. Physi-
cally, the combined ROM is then 192x2 + 64x4 + 192x2 +
64x4.
END-OF-LINE AND END-OF-SCREEN CODES
Please refer to the LM1247 datasheet for details.
BLANK CHARACTER REQUIREMENT
Five of the 512 Character ROM should be reserved as blank.
ROM Addresses 0 and 1 are for the use of the End-Of-
Screen and End-Of-Line characters as mentioned above.
ROM addresses 32, 63, and 511 must be reserved for test
engineering purposes. All other ROM addresses are usable,
and any that are unused must be filled with at least a
duplicate character. Any other addresses except for those
listed above should not be left blank.
DISPLAYING AN OSD IMAGE
Consecutive lines of characters make up the displayed win-
dow. These characters are stored in the page RAM through
the I
2
C compatible bus. Each line can contain any number of
characters up to the limit of the displayable line length (de-
pendent on the pixels per line register), although some re-
strictions concerning the enhanced features apply on char-
acter lines longer than 32 characters. The number of
characters across the width and height of the page can be
varied under I
2
C compatible control, but the total number of
characters that can be stored and displayed on the screen is
limited to 512 including any End-of-Line and End-of-Screen
characters. The horizontal and vertical start position can also
be programmed through the I
2
C compatible bus.
WINDOWS
Please refer to the LM1247 datasheet for details.
OSD VIDEO DAC
The Gain of the OSD DAC is now programmable by a 3 Bit
OSD contrast register, for 8 levels.
20096927
FIGURE 16. OSD Generator Block Diagram
L
www.national.com
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| LM1279 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:110 MHz RGB Video Amplifier System with OSD |
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| LM1279AN | 功能描述:IC AMP RGB VIDEO SYSTEM 20-DIP RoHS:否 類別:集成電路 (IC) >> 線性 - 放大器 - 視頻放大器和頻緩沖器 系列:- 標準包裝:1,000 系列:- 應用:驅動器 輸出類型:差分 電路數:3 -3db帶寬:350MHz 轉換速率:1000 V/µs 電流 - 電源:14.5mA 電流 - 輸出 / 通道:60mA 電壓 - 電源，單路/雙路(±):5 V ~ 12 V，±2.5 V ~ 6 V 安裝類型:表面貼裝 封裝/外殼:20-VFQFN 裸露焊盤 供應商設備封裝:20-QFN 裸露焊盤（4x4） 包裝:帶卷 (TR) |
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