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參數(shù)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(shù)： | 13/50頁 |
| 文件大?。?/td> | 6075K |
| 代理商： | LM1276AAA/NA |
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20096972
FIGURE 14. Overshoot Measurement
Bits 0 to 2 in registers 0x85C8, 0x85CA, or 0x85CC control
the emphasis. When a “4” is programmed into these bits the
overshoot is typically 11%. A “0” will give no overshoot in the
Hi-Brite window.
CENTER FREQUENCY
Shown in Figure 15 is how the center frequency is measured.
The center frequency is expressed as the time it takes the
overshoot to settle to within 5% of the DC level of the pulse.
20096973
FIGURE 15. Center Frequency Measurement
Bits 4 to 7 in register 0x85C1 control the center frequency.
When an “8” is programmed into 0x85C1[7:4] the t
Center Freq is
typically 80 ns. An “F” will give about 145 ns. A “0” will give
no emphasis in the Hi-Brite window.
HI-BRITE USER MODES
There are 3 different modes whose settings are to be preset
by the MCU. Text Mode, Movie Mode, and Picture Mode each
have their own HiBrite Contrast and Overshoot registers (See
the Preamp Interface Registers Table). When the user selects
a particular mode, the preset register settings of that mode
become in effect. There is also a 4th mode, which is the Cus-
tom Mode. The Custom Mode, however can be adjusted by
the user through the HiBrite Software, and is not preset by the
MCU. These modes can ONLY be selected or changed from
one to another through the HiBrite Software. There is no I2C
register to select the effective mode. The default mode for the
LM1276 is the Movie Mode. Thus, the Contrast and Over-
shoot settings that will be in effect when a window is initially
drawn or when the Full Screen HiBrite function is called will
be that of the settings preset for the Movie Mode.
FULL SCREEN HI-BRITE
The LM1276 is capable of applying HiBrite on the entire
screen without the need for Software. In the absence of Soft-
ware, this provides an alternative means of achieving em-
phasis and contrast boost on the picture through I2C. The
contrast setting and overshoot that will be applied when this
function is enabled will be that of the previously selected User
mode, during the last instance that the software was in oper-
ation. For example, if the user last selected the Picture Mode
in the Software preference menu, before exiting the program,
then the subsequent enabling of the Full Screen function
through I2C will result in the Picture Mode settings being in
effect on the full screen. The I2C bits that enable this function
are 0x8590[5:4]. Setting 0x8590[5] high will disable the HiB-
rite Window Generation circuit that works together with the
Software, and 0x8590[4] enables the Full Screen HiBrite. The
Window Generation Circuit must be shut off by 0x8590[5] in
order for 0x8590[4] to have an effect. Thus, to activate the Full
Screen feature, simply set 0x8590[5:4] to high, and to deac-
tivate, set 0x8590[5:4] to low.
HI-BRITE WINDOW GENERATION OPTIONS
Up to 8 separate windows can be drawn and enabled simul-
taneously, with programmable sizes and coordinates. The Hi-
Brite video enhancement can also be applied to the entire
desktop rather than to a specific window area or it can be
applied to everything outside of the drawn window(s). All of
this window programming can be achieved with National
Semiconductor’s software, and does not require any interfac-
ing with a microcontroller.
www.national.com
20
200969 Version 2 Revision 4
Print Date/Time: 2011/07/11 11:20:12
LM1276
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參數(shù)描述 |
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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(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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