- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄384594 > LM1276AAA (National Semiconductor Corporation) 150 MHz I2C Compatible RGB Preamplifier with Internal 512 Character OSD ROM, 512 Character RAM and 4 DACs PDF資料下載
參數(shù)資料
| 型號： | LM1276AAA |
| 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(nèi)置 |
| 文件頁數(shù)： | 21/50頁 |
| 文件大?。?/td> | 2597K |
| 代理商： | LM1276AAA |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁當(dāng)前第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁第34頁第35頁第36頁第37頁第38頁第39頁第40頁第41頁第42頁第43頁第44頁第45頁第46頁第47頁第48頁第49頁第50頁
Video Detection for Auto-Sizing & Auto-Centering
(Continued)
Auto Size Calculation Instruction Sequence
Set register bits 0xFFF8[5] and 0xFFF8[4] to high
Set register bits 0xFFFD[3] to low
Set register bit 0x8400[6] to high
Wait for 0x8400[7] to become high by itself
When 0x8400[7] is high, then read auto size data regis-
ters 0x8580 to 0x858F
Set register bits 0xFFFD[3] to high
Set register bits 0xFFF8[5] and 0xFFF8[4] to low
PLL Lock Detect and Horizontal
Input Select
During the monitor initialization routine by the MCU, register
bit 0xFFFD[3] must be set high. This bit is only set low during
OSD display operation and auto size calculations. Please
see the instructions above for Auto Size calculations.
The following sequence which involves register 0xFFFD and
0xFFF8 must be done by the MCU when the OSD is en-
abled. Register bits, 0xFFF8[5:4], control the PLL lock detect
override function.
Before writing to memory to setup the OSD, or
enabling OSD:
Set register bit 0x8400[0] to high
Set register bits 0xFFF8[5] and 0xFFF8[4] to high
Set register bits 0xFFFD[3] to low
Initialize OSD and write to memory
Set register bits 0x8400[1] and/or 0x8400[2] to high
Before disabling OSD:
Set register bits 0x8400[1] and/or 0x8400[2] to low
Set register bits 0xFFFD[3] to high
Set register bits 0xFFF8[5] and 0xFFF8[4] to low
Set register bit 0x8400[0] to low
Please see the OSD Programming section for more detailed
information or displaying OSD pages and accessing the
RAM
Hi-Brite Video Enhancement
Functional Description
The LM1276 enables a desired area of the CRT monitor
display to be enhanced for vivid TV quality images. The
LM1276 along with the software that is provided by National
Semiconductor is fully self-sufficient and independent of the
microcontroller in generating and controlling Hi-Brite win-
dows.
HI-BRITE VIDEO PROCESSING
The enhancement is achieved with programmable empha-
sis, programmable center frequency, and an additional Con-
trast adjustment control that is separate from the normal
Video Contrast Control of the preamp. Having an indepen-
dent contrast control allows the user to adjust the video gain
normally, having the higher gain to have a “brighter” picture
within the Hi-Brite window. The emphasis control is used to
give more “sparkle” to the highlighted video. Video that is
processed by the emphasis control has peaking added to the
video. Both the amplitude and the duration of the peaking
are adjustable through the NSC software, optimizing the
emphasis for different video resolutions. Maximum peaking
is 20%.
EMPHASIS
Emphasis is the amount of overshoot on the video signal.
Referring to
Figure 14
the overshoot is the ratio of the
overshoot voltage to the video level after the emphasis has
settled out of the output signal. The typical overshoot is
about 20%. The peak measurement is taken 9 ns from the
rising edge. This delay gives a more accurate peak mea-
surement by avoiding any ringing that may occur at the rising
edge. Overshoot is defined in percent as:
20096953
FIGURE 13. Timing Intervals
L
www.national.com
21
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LM139JAN | Low Power Low Offset Voltage Quad Comparators |
| LM1403 | Precision 2.50V Reference |
| LM1403A | Precision 2.50V Reference |
| LM1403AN | Precision 2.50V Reference |
| LM1403N | Precision 2.50V Reference |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)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(biāo)準(zhǔn)包裝:1,000 系列:- 應(yīng)用:驅(qū)動器 輸出類型:差分 電路數(shù):3 -3db帶寬:350MHz 轉(zhuǎn)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(yīng)商設(shè)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: |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。