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| 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(shù)： | 1/18頁 |
| 文件大小： | 300K |
| 代理商： | LM1212N |
TL/H/12354
L
August 1996
LM1212
230 MHz Video Amplifier System with OSD Blanking
General Description
The LM1212 is a very high frequency video amplifier system
intended for use in high resolution monochrome or RGB
color monitor applications with OSD. In addition to the wide-
band video amplifier the LM1212 contains a gated differen-
tial input black level clamp comparator for brightness con-
trol, a DC controlled attenuator for contrast control and a
DC controlled sub contrast attenuator for drive control. The
DC control for the contrast attenuator is pinned out sepa-
rately to provide a more accurate control system for RGB
color monitor applications. All DC controls offer a high input
impedance and operate over a 0V–4V range for easy inter-
face to bus controlled alignment systems. During the OSD
window, the output is blanked to
k
0.4V. The LM1212 oper-
ates from a nominal 12V supply but can be operated with
supply voltages down to 8V for applications that require re-
duced IC package power dissipation characteristics.
Features
Y
Wideband video amplifier
(f
b
3 dB
e
230 MHz at V
O
e
4 V
PP
)
Y
t
r
, t
f
e
1.5 ns at V
O
e
4 V
PP
Y
Externally gated comparator for brightness control
Y
0V to 4V high input impedance DC contrast control
(
l
40 dB range)
Y
0V to 4V high input impedance DC drive control
(
g
3 dB range)
Y
Ouput blanked to
k
0.4V for OSD window
Y
Easy to parallel three LM1212s for optimum color
tracking in RGB systems
Y
Output stage clamps to 0.65V and provides up to 9V
output voltage swing
Y
Output stage directly drives most hybrid or discrete
CRT amplifier stages
Applications
Y
High resolution CRT monitors with OSD
Y
Video switches
Y
Video AGC amplifier
Y
Wideband amplifier with gain and DC offset control
Block and Connection Diagram
TL/H/12354–1
Order Number LM1212N
See NS Package Number N20A
C
1996 National Semiconductor Corporation
RRD-B30M86/Printed in U. S. A.
http://www.national.com
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