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LM1212N データシート(PDF) 6 Page - National Semiconductor (TI) |
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LM1212N データシート(HTML) 6 Page - National Semiconductor (TI) |
6 / 18 page Circuit Description (Continued) Transistor Q7 buffers the video signal VIN and Q8 converts the voltage to current The AC collector current through Q8 is IC8 e VIN R9 Under maximum gain condition transistors Q9 and Q11 are off and all of IC8 flows through the load resistors R10 and R11 The maximum signal gain at the base of Q13 is AV1 eb(R10 a R11)R9 eb2 Signal attenuation is achieved by varying the base drive to the dif- ferential pairs Q9 Q10 and Q11 Q12 thereby unbalancing the collector currents through the transistor pairs Base of Q10 is biased at 53V by its connection to the emitter of Q41 (see Figure 5 ) Pin 2 is connected to pin 3 through a 10X resistor Adjusting the contrast voltage at 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 resistors 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 TLH12354 – 9 FIGURE 3 Simplified Schematic of the LM1212 Video Amplifier Input Stage http www nationalcom 6 |
同様の部品番号 - LM1212N |
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同様の説明 - LM1212N |
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