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LM1201M データシート(PDF) 5 Page - National Semiconductor (TI) |
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LM1201M データシート(HTML) 5 Page - National Semiconductor (TI) |
5 / 16 page Circuit Description Figure 5 is a block diagram of the LM1201 along with the contrast and brightness controls The contrast control is a DC operated attenuator which varies the AC gain of the amplifier without introducing any signal distortions or DC output shift The brightness control function requires a ‘‘sample and hold’’ circuit (black level clamp) which holds the DC bias of the video amplifier and CRT cathodes con- stant during the black level reference portion of the video waveform The clamp comparator when gated on during this reference period will charge or discharge the clamp capacitor until the non-inverting input of the clamp compara- tor matches that of the inverting input voltage which was set by the brightness control Figure 6 is a simplified schematic of the LM1201 video am- plifier along with the recommended external components The IC pin numbers are circled with all external components shown outside of the dashed line The video input is applied to pin 16 via the 10 mF coupling capacitor DC bias to the video input is through the 10 kX resistor which is connected to the 26V reference at pin 3 The low frequency roll-off of the amplifier is set by these two components Transistor Q1 buffers the video signal to the base of Q2 The Q2 collector current is then directed to the VCC1 supply through Q3 or to VCC2 through Q4 and the 500X load resistor depending upon the differential DC voltage at the bases of Q3 and Q4 The Q3 and Q4 differential base voltage is determined by the contrast control circuit which is described below The black level DC voltage at the collector of Q4 is maintained by Q5 and Q6 which are part of the black level clamp circuit also described below The video signal appearing at the col- lector of Q4 is then buffered by Q7 and level shifted down by Z1 and Q8 to the base of Q9 which will then provide additional system gain TLH10006 – 5 FIGURE 5 Block Diagram of LM201 Video Amplifier with Contrast and Black Level Control http www nationalcom 5 |
同様の部品番号 - LM1201M |
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同様の説明 - LM1201M |
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