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參數(shù)資料
| 型號(hào)： | LM2202N |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 230 MHz Video Amplifier System |
| 中文描述： | 1 CHANNEL, VIDEO AMPLIFIER, PDIP20 |
| 封裝： | N20A |
| 文件頁數(shù)： | 4/17頁 |
| 文件大?。?/td> | 416K |
| 代理商： | LM2202N |
Typical Performance Characteristics
(V
CC
= 12V, T
A
= 25C unless otherwise specified)
Circuit Description
Figure 2 shows a block diagram of the LM2202 video ampli-
fier along with contrast and brightness (black level) control.
Contrast control is a DC-operated attenuator which varies
the AC gain of the amplifier. Signal attenuation (contrast) is
achieved by varying the base drive to a differential pair and
thereby unbalancing the current through the differential pair.
As shown in Figure 2 pin 20 provides a 5.3V bias voltage for
the positive input of the attenuator (pin 1). Pin 3 provides a
control voltage for the negative input (pin 2) of the attenuator.
The voltage at pin 3 varies as the voltage at the contrast con-
trol input (pin 8) varies thus providing signal attenuation. The
gain is maximum (0 dB attenuation) if the voltage at pin 8 is
4V and is minimum (maximum attenuation) if the voltage at
pin 8 is 0V. The 0V to 4V DC-operated drive control at pin 9
Quiescent Supply Current
vs Supply Voltage
DS012591-3
Attenuation vs Drive Voltage
DS012591-4
Contrast vs Frequency
DS012591-5
Drive vs Frequency
DS012591-6
Attenuation vs
Contrast Voltage
DS012591-7
www.national.com
4
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