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參數(shù)資料
| 型號(hào)： | LM1212 |
| 文件頁(yè)數(shù)： | 13/18頁(yè) |
| 文件大?。?/td> | 285K |
| 代理商： | LM1212 |
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Applications of the LM1212
SINGLE VIDEO CHANNEL
A typical application for a single video channel is shown in
Figure 9. The video signal is AC coupled to pin 6. The
LM1212 internally biases the video signal to 2.6 V
DC
. Con-
trast control is achieved by applying a 0V to 4V DC voltage
at pin 8. The amplifier’s gain is minimum (i.e., maximum sig-
nal attenuation) if pin 8 is at 0V and is maximum if pin 8 is at
4V. With pin 9 (drive control) at 0V, the amplifier has a maxi-
mum gain of 10.
For DC restoration, a clamp signal must be applied to the
clamp gate input (pin 14). The clamp signal should be logic
low (less than 0.8V) only during the back porch (black level
reference period) interval (see Figure 2 ). The clamp gate
input is TTL compatible. Brightness control is provided by
applying a 0V to 4V DC voltage at pin 19. For example, if pin
19 is biased at 1V then the video signal’s black level will be
clamped at 1V. A 510
X
load resistor is connected from the
video output pin (pin 17) to ground. This resistor biases the
output stage of the amplifier. For power dissipation consid-
erations, the load resistor should not be much less than
510
X
.
RGB VIDEO PREAMPLIFIER
Figure 10 shows an RGB video preamplifier circuit using
three LM1212s. Note that pin 2 of IC1 is connected to pin 2
of IC2 and IC3 respectively. This allows IC1 to provide a
master contrast control and optimum contrast tracking.
Connecting pin 1 of all 3 ICs together provides the refer-
ence voltage for the contrast control. Adjusting the contrast
voltage at pin 8 of IC1 will vary the gain of all three video
channels. Drive control input (pin 9) of each LM1212 allows
individual gain adjustment for achieving white balance.
The black level of each video channel can be individually
adjusted to the desired voltage by adjusting the voltage at
pin 19. In a DC-coupled cathode drive application, adjusting
the voltage at pin 19 of each IC will provide cutoff adjust-
ment. In an AC-coupled cathode drive application, the video
signal is AC coupled and DC restored at the cathode. In
such an application, the video signal’s black level may be
clamped to the desired level by simply biasing pin 19 to the
black level voltage by using a voltage divider at pin 19.
http://www.national.com
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