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參數(shù)資料
| 型號： | LM1270NA |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | Hi-Brite 200 MHz I2C Compatible RGB Image Enhancer with Video Auto Sizing |
| 中文描述： | 高亮度場致200兆赫與I2C兼容的RGB視頻自動上漿圖像增強 |
| 文件頁數(shù)： | 5/27頁 |
| 文件大?。?/td> | 1302K |
| 代理商： | LM1270NA |
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Pin Descriptions
Pin
No.
1
2
3
Pin Name
Schematic
Description
Blue 1 Video In
Red 1 Video In
Green 1 Video In
Channel 1 video inputs. These inputs
must
be AC
coupled with a 0.1 μF cap. DC restoration is done at
these inputs. A series resistor of about 33
and
external ESD protection diodes should also be used.
Channel 1 video passes through the emphasis
section used for the Hi-Brite window. When using
Hi-Brite the channel 1 input pin must be shorted to
the corresponding channel 2 input pin.
4
Analog Input
Ground
Ground Pin for the input analog circuits of the
LM1270
5
6
7
Blue 2 Video In
Red 2 Video In
Green 2 Video In
Channel 2 video inputs. These video inputs
must
be
AC coupled with a 0.1 μF cap. DC restoration is
done at these inputs. A series resistor of about 33
and external ESD protection diodes should also be
used. When using Hi-Brite the channel 2 input pin
must be shorted to the corresponding channel 1
input pin.
8
10
Digital Ground
PLL V
CC
The ground pin should be connected to the rest of
the circuit ground by a short but independent PCB
trace to prevent contamination by extraneous
signals. The V
CC
pin should be isolated from the
rest of the V
CC
line by a ferrite bead and bypassed
to pin 8 with an electrolytic capacitor and a high
frequency ceramic.
Recommended topology and values are shown to
the left. It is recommended that both filter branches
be bypassed to the independent ground as close to
pin 8 as possible. Great care should be taken to
prevent external signals from coupling into this filter
from video, I
2
C compatible bus, etc.
9
PLL Filter
11
V Sync
Logic level vertical sync signal received from the
video card in the PC or sync stripper circuit.
L
www.national.com
5
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