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LMH6572 Datasheet(PDF) 9 Page - National Semiconductor (TI) |
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LMH6572 Datasheet(HTML) 9 Page - National Semiconductor (TI) |
9 / 12 page Application Notes (Continued) An alternate approach would be to tie the outputs directly together and let all devices share a common back termina- tion resistor in order to alleviate the gain error issue above. 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. EXPANDING THE MUX It is possible to build higher density MUX’s by paralleling several LMH6572’s. Figure 4 shows a 4:1 RGB MUX using two LMH6572’s: If it is important in the end application to make sure that no two inputs are presented to the output at the same time, an optional delay block can be added, prior to the ENABLE (EN) pin of each device, as shown. Figure 5 shows one possible approach to this delay circuit. The delay circuit shown will delay ENABLE’s H to L transitions (R 1 and C1 decay) but won’t delay its L to H transition. 20109617 FIGURE 3. Multiplexer Input Expansion by Combining Output 20109618 FIGURE 4. RGB MUX USING TWO LMH6572’s www.national.com 9 |
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Similar Description - LMH6572 |
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