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LMH6574 Datasheet(PDF) 10 Page - National Semiconductor (TI) |
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LMH6574 Datasheet(HTML) 10 Page - National Semiconductor (TI) |
10 / 14 page Application Notes GENERAL INFORMATION The LMH6574 is a high-speed 4:1 analog multiplexer, opti- mized for very high speed and low distortion. With selectable gain and excellent AC performance, the LMH6574 is ideally suited for switching high resolution, presentation grade video signals. The LMH6574 has no internal ground reference. Single or split supply configurations are both possible. The LMH6574 features very high speed channel switching and disable times. When disabled the LMH6574 output is high impedance making MUX expansion possible by combining multiple devices. See “Multiplexer Expansion” section below. VIDEO PERFORMANCE The LMH6574 has been designed to provide excellent per- formance with production quality video signals in a wide variety of formats such as HDTV and High Resolution VGA. Best performance will be obtained with back-terminated loads. The back termination reduces reflections from the transmission line and effectively masks transmission line and other parasitic capacitances from the amplifier output stage. Figure 1 shows a typical configuration for driving a 75 Ω. Cable. The output buffer is configured for a gain of 2, so using back terminated loads will give a net gain of 1. FEEDBACK RESISTOR SELECTION 20119722 FIGURE 1. Typical Application 20119732 FIGURE 2. Suggested R F vs. Gain www.national.com 10 |
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Similar Description - LMH6574_05 |
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