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參數(shù)資料
| 型號： | LM1209 |
| 廠商： | National Semiconductor Corporation |
| 元件分類： | 運動控制電子 |
| 英文描述： | 130 MHz/100 MHz RGB Video Amplifier System with Blanking |
| 中文描述： | 130 MHz/100 MHz的RGB視頻信號放大器系統(tǒng)的沖裁 |
| 文件頁數(shù)： | 11/25頁 |
| 文件大?。?/td> | 434K |
| 代理商： | LM1209 |
Functional Description
(Continued)
TL/H/11884–11
FIGURE 6. Block Diagram of LM1208/LM1209 Video Amplifier
TL/H/11884–12
FIGURE 7. Timing Diagram
Circuit Description
VIDEO AMPLIFIER INPUT STAGE
Figure 8 is a simplified schematic of one of the three video
amplifiers input stage along with the recommended external
components. The IC pin numbers are circled and all external
components are shown outside the dashed line. The video
input is applied to pin 6 via a 10
m
F coupling capacitor and a
30
X
resistor. The resistor is added to limit the current
through the input pin should an applied voltage surge rise
above V
CC
or drop below ground. The performance of the
LM1208/LM1209 is not degraded by the 30
X
resistor. How-
ever, if EMI is a concern this resistor can be increased to
well over 100
X
where the rise and fall times will start to
become longer. DC bias to the input pin is provided by Q5
and its associated input circuitry. Z1 is a 5.6V zener that
generates the input bias voltage. Q1 is a buffer to the zener
reference voltage with 5.0V generated at its emitter. Q3 and
Q4 are connected as diodes. Q2 is close to being a diode in
this circuit. This configuration will give about 2.0V at the
collector of Q2. R2 and R3 are a voltage divider, setting the
base of Q5 to about 3.5V. This sets the emitter of Q5 to
about 2.8V, the bias voltage of the video input. This bias
voltage is necessary to assure that the entire video signal
stays within the active operating region of the LM1208/
LM1209. The bias voltage goes through R6, a 20k resistor,
to the video input at pin 6. R4 and R6 are of the same value
and R4 is used to compensate for beta variations of the
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11
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