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參數(shù)資料
| 型號： | LM1270 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | Hi-Brite 200 MHz I2C Compatible RGB Image Enhancer with Video Auto Sizing |
| 中文描述： | 高亮度場致200兆赫與I2C兼容的RGB視頻自動上漿圖像增強 |
| 文件頁數(shù)： | 4/27頁 |
| 文件大?。?/td> | 1302K |
| 代理商： | LM1270 |
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External Interface Signals Electrical Characteristics
(Continued)
Note 15:
Limits met by matching the external resistor going to pin 24 to the H Flyback voltage.
Typical Performance Characteristics
V
CC
= 5V, T
A
= 25C unless otherwise specified.
Emphasis, Center Frequency at Maximum
Center Frequency, Emphasis at Maximum
20063502
20063503
The above two plots show the processing done by the
LM1270 on the video input signal. There are two variables
for the video processing, emphasis and center frequency.
Emphasis is controlled by bits 0-2 in register 0B. This gives
8 different levels of emphasis. In the above plot the center
frequency is set at its maximum level and the 8 different
levels of emphasis is measured. The output video with no
emphasis is adjusted to a 0.7 V
level. Using maximum
emphasis the video is increased to a 0.9 V
level at the
rising edge of the video. If the falling edge was measured it
would show a similar waveform, but going in the negative
direction.
Center frequency is shown in the second plot. Control of the
center frequency is done with bits 0-3 in register 0C. This
gives 16 adjustments for this feature. Every other adjustment
is shown in the above plot, showing all 16 adjustments would
have made the plot too hard to read. The curves closely
approximate the peaking of an RC network, therefore the
term center frequency means the RC time constant that is
approximated by each curve in the above plot. A true RC
peaking network would give very large overshoots. The
LM1270 has special circuitry to clip the very large over-
shoots, yet has the complete benefit of the RC peaking. This
special circuitry allows for much more overshoot than one
could do with RC peaking and still not saturate the video
channel.
Note that the video channel with the emphasis also has its
own independent contrast control. This allows the user to
adjust his monitor for a brighter picture within the Hi-Brite
window and optimize the emphasis for the resolution he is
using with the monitor. Now the user of the monitor can give
his pictures or video a special “sparkle” when using the
capabilities of the LM1270.
L
www.national.com
4
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LM1270N | Hi-Brite 200 MHz I2C Compatible RGB Image Enhancer with Video Auto Sizing |
| LM1270NA | Hi-Brite 200 MHz I2C Compatible RGB Image Enhancer with Video Auto Sizing |
| LM1279 | 110 MHz RGB Video Amplifier System with OSD |
| LM1279N | 110 MHz RGB Video Amplifier System with OSD |
| LM1281 | 85 MHz RGB Video Amplifier System with On Screen Display (OSD) |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM1270N | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Hi-Brite 200 MHz I2C Compatible RGB Image Enhancer with Video Auto Sizing |
| LM1270NA | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Hi-Brite 200 MHz I2C Compatible RGB Image Enhancer with Video Auto Sizing |
| LM1276 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:150 MHz I2C Compatible RGB Preamplifier with Internal 512 Character OSD ROM, 512 Character RAM and 4 DACs |
| LM1276AAA | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:150 MHz I2C Compatible RGB Preamplifier with Internal 512 Character OSD ROM, 512 Character RAM and 4 DACs |
| 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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