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參數資料
| 型號： | LM1253AAE/NA |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 畫面疊加 |
| 英文描述： | ON-SCREEN DISPLAY IC, PDIP28 |
| 封裝： | 0.600 INCH, PLASTIC, DIP-28 |
| 文件頁數： | 10/61頁 |
| 文件大小： | 1671K |
| 代理商： | LM1253AAE/NA |
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Pre-Amp Functional Description (Continued)
TABLE 2. Registers Controlling the Output Video and Clamp Signal
Parameter
Address
Size
Description
Default
BGAIN
8430h
7 Bit
Blue Channel Gain
60h
GGAIN
8431h
7 Bit
Green Channel Gain
60h
RGAIN
8432h
7 Bit
Red Channel Gain
60h
CONTRAST
8433h
7 Bit
Overall Gain of All Three Channels
60h
BBIAS
8434h
8 Bit
Blue Bias Clamp Pulse Amplitude
80h
GBIAS
8435h
8 Bit
Green Bias Clamp Pulse Amplitude
80h
RBIAS
8436h
8 Bit
Red Bias Clamp Pulse Amplitude
80h
BRIGHTNESS
8437h
8 Bit
Amplitude of Brightness Clamp Pulse of All 3 Channels
80h
PEDESTAL
8438h Bits 7–5
3 Bit
Offset to the Brightness Control
4h
OSD
CONTRAST
8438h Bits 4–3
2 Bit
OSD Gain
2h
DC OFFSET
8438h Bits 2–0
3 Bit
Active Video DC Offset of All 3 Channels
4h
An active horizontal blanking signal is added to the video at
the output, giving excellent smear performance, and pre-
venting video content dependent DC bias offsets as a result
of high frequency over shoot.
The outputs are referenced to a DC level (V
REF) produced by
the LM1253A preamp, and so are guaranteed to provide
stable DC operating levels within the system without the
need for additional external feedback components.
DS101265-31
FIGURE 28. Register Control of the Output Video and Clamp Signal
LM1253A
www.national.com
18
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