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LM1202 データシート(PDF) 6 Page - National Semiconductor (TI) |
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LM1202 データシート(HTML) 6 Page - National Semiconductor (TI) |
6 / 18 page Circuit Description (Continued) pin 8 produces a control voltage at pin 3 which drives the base of Q9 By varying the voltage at the base of Q9 Q8’s collector current (IC8) is diverted away from the load resis- tors R10 and R11 thereby providing signal attenuation Maximum attenuation is achieved when all of IC8 flows through Q9 and no current flows through the load resistors The differential pair Q11 and Q12 provide drive control Q12’s base is internally biased at 73V Adjusting the volt- age at the drive control input (pin 9) produces a control voltage at the base of Q11 With Q9 off and Q12 off all of IC8 flows through R10 thus providing a gain of AV1 e b (R10R9) c VIN eb1 Drive control thus provides a 6 dB attenuation range TLH11440 – 4 FIGURE 3 Simplified Schematic of the LM1202 Video Amplifier Input Stage http www nationalcom 6 |
同様の部品番号 - LM1202 |
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同様の説明 - LM1202 |
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