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参数资料
| 型号： | LM2202N/NOPB |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | 音频／视频放大 |
| 英文描述： | 1 CHANNEL, VIDEO AMPLIFIER, PDIP20 |
| 封装： | N20A |
| 文件页数： | 12/17页 |
| 文件大小： | 416K |
| 代理商： | LM2202N/NOPB |
Typical Performance Characteristics (V
CC = 12V, TA = 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
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相关代理商/技术参数 |
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| LM220K12 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Analog IC |
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