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LMH6570MAX Datasheet(PDF) 9 Page - National Semiconductor (TI) |
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LMH6570MAX Datasheet(HTML) 9 Page - National Semiconductor (TI) |
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9 / 14 page  Application Notes GENERAL INFORMATION The LMH6570 is a high-speed 2:1 analog multiplexer, opti- mized for very high speed and low distortion. With selectable gain and excellent AC performance, the LMH6570 is ideally suited for switching high resolution, presentation grade video signals. The LMH6570 has no internal ground reference. Single or split supply configurations are both possible, how- ever, all logic functions are referenced to the mid supply point. The LMH6570 features very high speed channel switching and disable times. When disabled the LMH6570 output is high impedance making MUX expansion possible by combining multiple devices. See “Multiplexer Expansion” section below. The LMH6570 SEL defaults to logic low (IN0 active). The default state for the SD pin is also logic low (device enabled). Both pins can be left floating if the default state is desired. VIDEO PERFORMANCE The LMH6570 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 The LMH6570 has a current feedback output buffer with gain determined by external feedback (R F) and gain set (RG) resistors. With current feedback amplifiers, the closed loop frequency response is a function of R F. For a gain of 2 V/V, the recommended value of R F is 576 Ω. For other gains see the chart “Suggested R F vs Gain”. Generally, lowering RF from the recommended value will peak the frequency re- 20129922 FIGURE 1. Typical Application 20129932 FIGURE 2. Suggested R F vs. Gain www.national.com 9 |
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