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LM1205A Folha de dados(PDF) 2 Page - Texas Instruments |
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LM1205A Folha de dados(HTML) 2 Page - Texas Instruments |
2 / 26 page LM1205A/LM1207A 130 MHz/85 MHz RGB Video Amplifier System with Blanking General Description The LM1205A/LM1207A is a very high frequency video am- plifier system intended for use in high resolution RGB moni- tor applications. In addition to the three matched video am- plifiers, the LM1205A/LM1207A contains three gated single ended input black level clamp comparators for brightness control, three matched DC controlled attenuators for contrast control, and three DC controlled sub-contrast attenuators providing gain trim capability for white balance. All DC con- trol inputs offer high input impedance and an operation range from 0V to 4V for easy interface to bus controlled alignment systems. The LM1205A/LM1207A also contains a blanking circuit which clamps the video output voltage during blanking to within 0.1V above ground. This feature provides blanking capability at the cathodes of the CRT. A spot killer is provided for CRT phosphor protection during power-down. Features n Three wideband video amplifiers 130 MHz (LM1205A) @ −3 dB (4 V PP output) n Matched (±0.1 dB or 1.2%) attenuators for contrast control n ESD susceptibility above 3 kV n Three externally gated single ended input comparators for cutoff and brightness control n 0V to 4V, high input impedance DC contrast control (>40 dB range) n 0V to 4V, high input impedance DC drive control for each video amplifier (−6 dB to 0 dB range) n Spot killer, blanks output when V CC < 10.6V n Capable of 7 V PP output swing (slight reduction in bandwidth) n Output stage blanking n Output stage directly drives most hybrid or discrete CRT drivers Applications n High resolution RGB CRT monitors n Video AGC amplifiers n Wideband amplifiers with gain and DC offset controls n Interface amplifiers for LCD or CCD systems Block and Connection Diagram DS012866-1 FIGURE 1. Order Number LM1205AN or LM1207AN, See NS Package Number N28B August 1996 © 1997 National Semiconductor Corporation DS012866 www.national.com |
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