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LM1203B データシート(PDF) 7 Page - National Semiconductor (TI) |
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LM1203B データシート(HTML) 7 Page - National Semiconductor (TI) |
7 / 16 page Applications Information Figure 4 shows the block diagram of a typical analog RGB color monitor The RGB monitor is used with CADCAM work stations PC’s arcade games and in a wide range of other applications that benefit from the use of color display terminals The RGB color monitor characteristics may differ in such ways as sweep rates screen size CRT color trio spacing (dot pitch) or in video amplifier bandwidths but will still be generally configured as shown in Figure 4 Separate horizontal and vertical sync signals may be required or they may be contained in the green video input signal The video input signals are usually supplied by coax cable which is terminated in 75X at the monitor input and internally AC coupled to the video amplifiers These input signals are ap- proximately 1V peak to peak in amplitude and at the input of the high voltage video section approxmiately 5V peak to peak At the cathode of the CRT the video signals can be as high as 60V peak to peak One important requirement of the three video amplifiers is that they match and track each other over the contrast and brightness control range The Figure 4 block labeled ‘‘VIDEO AMPLIFICATION WITH GAIN AND DC CONTROL’’ describes the function of the LM1203B which contains the three matched video amplifi- ers contrast control and brightness control Circuit Description Figure 5 is a block diagram of one of the video amplifiers along with the contrast and brightness controls The con- trast control is a DC-operated attenuator which varies the AC gain of all three amplifiers simultaneously while not intro- ducing any signal distortions or tracking erros The bright- ness control function requires a ‘‘sample and hold’’ circuit (black level clamp) which holds the DC bias of the video amplifiers and CRT cathodes constant during the black level reference portion of the video waveform The clamp com- parator when gated on during this reference period will charge or discharge the clamp capacitor until the plus input of the clamp comparator matches that of the minus input voltage which was set by the brightness control TLH11489 – 8 FIGURE 4 Typical RGB Color Monitor Block Diagram TLH11489 – 9 FIGURE 5 Block Diagram of LM1203B Video Amplifier with Contrast and Black Level Control http www nationalcom 7 |
同様の部品番号 - LM1203B |
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同様の説明 - LM1203B |
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