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LM2202M Folha de dados(PDF) 4 Page - National Semiconductor (TI) |
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LM2202M Folha de dados(HTML) 4 Page - National Semiconductor (TI) |
4 / 17 page Typical Performance Characteristics (V CC = 12V, TA = 25˚C 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 |
Nº de peça semelhante - LM2202M |
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Descrição semelhante - LM2202M |
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