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參數(shù)資料
| 型號： | LM1247 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | 150 MHz I2C Compatible RGB Preamplifier with Internal 512 Character OSD ROM, 512 Character RAM and 4 DACs |
| 中文描述： | 150 MHz的I2C兼容的RGB前置放大器512個字符OSD光盤，512個字符RAM和4 DAC的內(nèi)置 |
| 文件頁數(shù)： | 9/48頁 |
| 文件大?。?/td> | 3141K |
| 代理商： | LM1247 |
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Typical Performance Characteristics
V
CC
= 5V, T
A
= 25C unless otherwise specified (Continued)
TABLE 3. OSD Register recommendations
PPL=0
25 - 61
NR
NR
PPL=1
25 - 53
NR
NR
PPL=2
25 - 48
48 - 98
NR
PPL=3
25 - 43
43 - 88
88 - 110
PPL=4
25 - 40
40 - 81
81 - 110
PPL=5
25 - 36
36 - 74
74 - 110
PPL=6
25 - 34
34 - 69
69 - 110
PPL=7
25 - 31
31 - 64
64 - 110
PLL=1
PLL=2
PLL=3
Pin Descriptions and Application Information
Pin
No.
1
Pin Name
Schematic
Description
V Flyback
Required for OSD synchronization and is also
used for vertical blanking of the video outputs.
The actual switching threshold is about 35% of
V
CC
. For logic level inputs C
4
can be a jumper,
but for flyback inputs, an AC coupled
differentiator is recommended, where R
V
is large
enough to prevent the voltage at pin 1 from
exceeding V
CC
or going below GND. C
4
should
be small enough to flatten the vertical rate ramp
at pin 1. C
24
may be needed to reduce noise.
Provides filtering for the internal voltage which
sets the internal bias current in conjunction with
R
EXT
. A minimum of 0.1 μF is recommended for
proper filtering. This capacitor should be placed
as close to pin 2 and the pin 4 ground return as
possible.
2
V
REF
Bypass
3
V
REF
External resistor, 10k 1%, sets the internal bias
current level for optimum performance of the
LM1247. This resistor should be placed as close
to pin 3 and the pin 4 ground return as possible.
4
Analog Input
Ground
This is the ground for the input analog portions
of the LM1247 internal circuitry.
5
6
7
Blue Video In
Red Video In
Green Video In
These video inputs must be AC coupled with a
.0047 μF cap. Internal DC restoration is done at
these inputs. A series resistor of about 33
and
external ESD protection diodes should also be
used for protection from ESD damage.
L
www.national.com
9
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