参数资料
型号: LM1279AN/NOPB
厂商: NATIONAL SEMICONDUCTOR CORP
元件分类: 音频/视频放大
英文描述: 3 CHANNEL, VIDEO AMPLIFIER, PDIP20
封装: DIP-20
文件页数: 10/13页
文件大小: 511K
代理商: LM1279AN/NOPB
Pin Descriptions
Pin
No.
Pin
Name
Schematic
Description
1
Red OSD Input
These are standard TTL inputs. An OSD
signal at any of the three pins will
automatically switch the pre-amp into the
OSD mode. 7 colors, including white, are
available.
19
Blue OSD Input
20
Green OSD Input
2V
CC1
Power supply pin (excluding output stage)
3
Red Video In
Video inputs. These inputs
must be AC
Coupled with a minimum ofa1F cap, 10
F is preferred. A series resistor of about
33
must be used for ESD protection.
5
Green Video In
8
Blue Video In
4
Red Clamp Cap
The external clamp cap is charged and
discharged to the correction voltage
needed for DC restoration. 0.1 F is the
recommended value.
7
Green Clamp Cap
9
Blue Clamp Cap
6
Ground
Ground pin.
10
Contrast
Contrast control pin:
4V - no attenuation
0V - over 40 dB attenuation
Drive control pins:
4V - no attenuation
0V - 20 dB attenuation
12
Blue Drive
14
Green Drive
17
Red Drive
11
Clamp Pulse
The clamp pulse activates the DC
restoration circuitry. A 3.6V input is
required to activate the clamp pulse.
13
Blue Video Out
Video output. For proper black level the
output must drive 390
impedance.
15
Green Video Out
18
Red Video Out
LM1279A
www.national.com
6
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