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參數資料
| 型號： | LM1276AAA/NA |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 1 CHANNEL, VIDEO PREAMPLIFIER, PDIP28 |
| 封裝： | PLASTIC, DIP-28 |
| 文件頁數： | 14/50頁 |
| 文件大小： | 6075K |
| 代理商： | LM1276AAA/NA |
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OSD Generator Operation
20096927
FIGURE 16. OSD Generator Block Diagram
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 al-
lows 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 ad-
dresses 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 I2C 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 I2C 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 I2C 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.
21
www.national.com
200969 Version 2 Revision 4
Print Date/Time: 2011/07/11 11:20:12
LM1276
相關PDF資料 |
PDF描述 |
|---|---|
| LM1279AN/NOPB | 3 CHANNEL, VIDEO AMPLIFIER, PDIP20 |
| LM1279N/NOPB | 1 CHANNEL, VIDEO AMPLIFIER, PDIP20 |
| LM136A-2.5MD8 | 1-OUTPUT TWO TERM VOLTAGE REFERENCE, 5 V, UUC |
| LM136A-5.0MW8 | 1-OUTPUT TWO TERM VOLTAGE REFERENCE, 5 V, UUC |
| LM136A-5.0MD8 | 1-OUTPUT TWO TERM VOLTAGE REFERENCE, 5 V, UUC |
相關代理商/技術參數 |
參數描述 |
|---|---|
| LM1279 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:110 MHz RGB Video Amplifier System with OSD |
| LM12791DL WAF | 制造商:Texas Instruments 功能描述: |
| LM1279A | 制造商:未知廠家 制造商全稱:未知廠家 功能描述: |
| 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) |
| LM1279DL WAF | 制造商:Texas Instruments 功能描述: |
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