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参数资料
| 型号： | LM1283N |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | 音频／视频放大 |
| 英文描述： | 140 MHz RGB Video Amplifier System with On Screen Display (OSD) |
| 中文描述： | 3 CHANNEL, VIDEO AMPLIFIER, PDIP28 |
| 封装： | 0.600 IINCH, PLASTIC, DIP-28 |
| 文件页数： | 10/13页 |
| 文件大小： | 401K |
| 代理商： | LM1283N |
Pin Descriptions
(Continued)
Pin No.
5
8
11
Pin Name
Schematic
Description
Red Video In
Green Video In
Blue Video In
Video inputs. These inputs
must
be AC
Coupled with a minimum of a 1 μF cap, 10 μF
is preferred. DC restoration is done at these
inputs. A series resistor of about 33
should
also be used.
6
9
7
10
21
12
V
CC1
Power supply pins (excluding output stage)
Ground
Ground pins. All grounds are internally
connected and must also be connected on the
PCB.
Pin used for additional filter capacitor to
internal reference. The voltage at this pin is
2.0V.
V
REF
13
14
26
27
28
Video Contrast
OSD Constrast
Blue Drive
Green Drive
Red Drive
Contrast control pins:
4V— no attenuation
0V— over 60 dB attenuation
Drive control pins:
4V— no attenuation
0V— 12 dB attenuation
15
16
Clamp Gate
Blank Gate
Both pins accept TTL inputs and are active
low. The clamp gate provides DC restoration of
the video signal. The blank gate forces the
video outputs to below 200 mV.
17
19
24
Blue Clamp Cap
Green Clamp Cap
Red Clamp Cap
The external clamp cap is charged and
discharged to the correction voltage needed for
DC restoration. 0.1 μF is the recommended
value.
18
20
23
Blue Video Out
Green Video Out
Red Video Out
Video output. For proper black level the output
must drive 390
impedance.
22
V
CC2
Power supply pin for the output stage. There
are no internal connections to V
CC1
www.national.com
10
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