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LMH6572 Datasheet(PDF) 10 Page - National Semiconductor (TI) |
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LMH6572 Datasheet(HTML) 10 Page - National Semiconductor (TI) |
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10 / 12 page  Application Notes (Continued) The drawback in this case is the increased capacitive load presented to the output of each LMH6572 due to the off- state capacitance of the LMH6572. Other Applications The LMH6572 may be utilized in systems that involve a single RGB channel as well whenever there is a need to switch between different “flavors” of a single RGB input. Here are some examples: 1. RGB positive polarity, negative polarity switch 2. RGB full resolution, high-pass filter switch In each of these applications, the same RGB input occupies one set of inputs to the LMH6572 and the other “flavor” would be tied to the other input set. DRIVING CAPACITIVE LOADS Capacitive output loading applications will benefit from the use of a series output resistor. Figure 6 shows the use of a series output resistor, R OUT, to stabilize the amplifier output under capacitive loading. Capacitive loads of 5 to 120 pF are the most critical, causing ringing, frequency response peak- ing and possible oscillation. Figure 7gives a recommended value for selecting a series output resistor for mitigating capacitive loads. The values suggested in the charts are selected for .5 dB or less of peaking in the frequency re- sponse. This gives a good compromise between settling time and bandwidth. For applications where maximum fre- quency response is needed and some peaking is tolerable, the value of R OUT can be reduced slightly from the recom- mended values. LAYOUT CONSIDERATIONS Whenever questions about layout arise, use the LMH730151 evaluation board as a guide. To reduce parasitic capaci- tances, ground and power planes should be removed near the input and output pins. For long signal paths controlled impedance lines should be used, along with impedance matching elements at both ends. Bypass capacitors should be placed as close to the device as possible. Bypass capaci- tors from each rail to ground are applied in pairs. The larger electrolytic bypass capacitors can be located farther from the device; however, the smaller ceramic capacitors should be placed as close to the device as possible. In Figure 1 and Figure 2, the capacitor between V + and V− is optional, but is recommended for best second harmonic distortion. Another way to enhance performance is to use pairs of .01 µF and .1 µF ceramic capacitors for each supply bypass. POWER DISSIPATION The LMH6572 is optimized for maximum speed and perfor- mance in the small form factor of the standard SSOP pack- age. To achieve its high level of performance, the LMH6572 20109624 FIGURE 6. Decoupling Capacitive Loads 20109604 FIGURE 7. Recommended R OUT vs. Capacitive Load 20109613 FIGURE 8. Frequency Response vs. Capacitive Load www.national.com 10 |
Similar Part No. - LMH6572_05 |
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Similar Description - LMH6572_05 |
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