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參數資料
| 型號： | LM1247AAG/NA/NOPB |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 3 CHANNEL, VIDEO PREAMPLIFIER, PDIP24 |
| 封裝： | PLASTIC, DIP-24 |
| 文件頁數： | 8/48頁 |
| 文件大小： | 3141K |
| 代理商： | LM1247AAG/NA/NOPB |
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OSD Generator Operation (Continued)
varied under I
2C 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 I
2C compatible bus.
WINDOWS
Two separate windows can be opened, utilizing the data
stored in the page RAM. Each window has its own horizontal
and vertical start position, although the second window
should be horizontally spaced at least two character spaces
away from the first window, and should never overlap the
first window when both windows are on. The OSD window
must be placed within the active video.
OSD VIDEO DAC
The OSD DAC is controlled by the 9-bit (3x3 bits) OSD video
information coming from the pixel serializer look-up table.
The look-up table in the OSD palette is programmed to
select 4 color levels out of 8 linearly spaced levels per
channel. The OSD DAC is shown in Figure 14, where the
gain is programmable by the 2-bit OSD contrast register, in 4
stages to give the required OSD signal. The OSD DACs use
the reference voltage, V
REF, to bias the OSD outputs.
OSD VIDEO TIMING
The OSD analog signal then goes to the switch, shown in
from input video to OSD and back again as determined by
the control registers. This is also where horizontal and ver-
tical blanking are also inserted at their appropriate intervals.
20048428
FIGURE 13. Bank Addressing
LM1247
www.national.com
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相關代理商/技術參數 |
參數描述 |
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| LM1247DMC/NA | 制造商:Texas Instruments 功能描述: |
| LM124A | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Low Power Quad Operational Amplifiers |
| LM124AD | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:LOW POWER QUAD OPERATIONAL AMPLIFIERS |
| LM124ADR | 制造商:TI 制造商全稱:Texas Instruments 功能描述:QUADRUPLE OPERATIONAL AMPLIFIERS |
| LM124ADT | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Voltage-Feedback Operational Amplifier |
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