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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： | 11/50頁 |
| 文件大小： | 6075K |
| 代理商： | LM1276AAA/NA |
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20096953
FIGURE 13. Timing Intervals
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 registers
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 enabled.
Register bits, 0xFFF8[5:4], control the PLL lock detect over-
ride 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 dis-
play to be enhanced for vivid TV quality images. The LM1276
along with the software that is provided by National Semicon-
ductor is fully self-sufficient and independent of the micro-
controller in generating and controlling Hi-Brite windows.
HI-BRITE VIDEO PROCESSING
The enhancement is achieved with programmable emphasis,
programmable center frequency, and an additional Contrast
adjustment control that is separate from the normal Video
Contrast Control of the preamp. Having an independent con-
trast 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 dif-
ferent 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 over-
shoot 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 measurement by
avoiding any ringing that may occur at the rising edge. Over-
shoot is defined in percent as:
19
www.national.com
200969 Version 2 Revision 4
Print Date/Time: 2011/07/11 11:20:12
LM1276
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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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