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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) 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 4 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 will not delay its L to H transition. R 2 should be kept small compared to R1 in order to not reduce the ENABLE voltage and to produce little or no delay to theENABLE L to H transition. With the ENABLE pin putting the output stage into a high impedance state, several LMH6572’s can be tied together to form a larger input MUX. However, there is a slight loading effect on the active output caused by the off-channel feed- back and gain set resistors, as shown in Figure 5. Figure 5 is assuming there are 4 LMH6572 devices tied together to form a triple 8:1 MUX. With the internal resistors valued at ap- proximately 800 Ω, the gain error is about -0.57 dB, or about −6%. 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. 20109618 FIGURE 3. RGB MUX USING TWO LMH6572’s 20109619 FIGURE 4. Delay Circuit Implementation 20109617 FIGURE 5. Multiplexer Input Expansion by Combining Outputs www.national.com 9 |
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