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參數(shù)資料
| 型號： | LM2202M/NOPB |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 1 CHANNEL, VIDEO AMPLIFIER, PDSO20 |
| 封裝： | M20B |
| 文件頁數(shù)： | 4/17頁 |
| 文件大?。?/td> | 416K |
| 代理商： | LM2202M/NOPB |
Circuit Description (Continued)
Applications
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
LM2202 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 in-
put is TTL compatible. Brightness control is provided by ap-
plying 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
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 consider-
ations, the load resistor should not be much less than 510
.
RGB VIDEO PREAMPLIFIER
Figure 10 shows an RGB video preamplifier circuit using
three LM2202s. Note that pins 1 and 2 of IC1 are connected
to pins 1 and 2 of IC2 and IC3 respectively. This allows IC1
to provide a master contrast control and optimum contrast
tracking. 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 LM2202 allows individual gain adjustment for
achieving white balance.
The black level of each video channel can be individually ad-
justed 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 adjustment. In
an AC-coupled cathode drive application, the video signal is
AC coupled and DC restored at the cathode. In such an ap-
plication, 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.
DS012591-14
FIGURE 8. Simplified Schematic of the LM2202 Clamp Comparator Circuit
www.national.com
12
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