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參數資料
| 型號： | LM1212N |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 230 MHz Video Amplifier System with OSD Blanking |
| 中文描述： | 1 CHANNEL, VIDEO AMPLIFIER, PDIP20 |
| 封裝： | N20A |
| 文件頁數： | 16/18頁 |
| 文件大小： | 300K |
| 代理商： | LM1212N |
Applications of the LM1212
(Continued)
TL/H/12354–17
FIGURE 10. LM1212 Video Preamp Demonstration Board Schematic
(Continued)
Power Down Characteristics
The LM1212 includes a built-in power down spot killer to
prevent a flash on the screen upon power down. The
LM1212’s output voltage decreases as the device is being
powered down, thus preventing a flash on the screen. In
some preamplifiers, the video output signal may go high as
the device is being powered down. This may cause a whiter-
than-white level at the output of the CRT driver, thus caus-
ing a flash on the screen.
PC Board Layout Considerations
For optimum performance and stable operation, a double-
sided printed circuit board with adequate ground plane and
power supply decoupling as close to the V
CC
pins as possi-
ble is recommended. For suggestions on optimum PC board
layout, please see the reference section below.
Reference
Ott, Henry W, Noise Reduction Techniques in Electronic
Systems, John Wiley & Sons, New York, 1976.
http://www.national.com
16
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