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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： | 48/48頁 |
| 文件大小： | 3141K |
| 代理商： | LM1247AAG/NA/NOPB |
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Typical Performance Characteristics V
CC =5V, TA = 25C unless otherwise specified (Continued)
TABLE 3. OSD Register recommendations
PPL=0
PPL=1
PPL=2
PPL=3
PPL=4
PPL=5
PPL=6
PPL=7
PLL=1
25 - 61
25 - 53
25 - 48
25 - 43
25 - 40
25 - 36
25 - 34
25 - 31
PLL=2
NR
48 - 98
43 - 88
40 - 81
36 - 74
34 - 69
31 - 64
PLL=3
NR
88 - 110
81 - 110
74 - 110
69 - 110
64 - 110
Pin Descriptions and Application Information
Pin
No.
Pin Name
Schematic
Description
1
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 C4 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. C4 should
be small enough to flatten the vertical rate ramp
at pin 1. C
24 may be needed to reduce noise.
2V
REF Bypass
Provides filtering for the internal voltage which
sets the internal bias current in conjunction with
R
EXT. A minimum of 0.1 F is recommended for
proper filtering. This capacitor should be placed
as close to pin 2 and the pin 4 ground return as
possible.
3V
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 F 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.
LM1247
www.national.com
9
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