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LM9801 датащи(PDF) 32 Page - National Semiconductor (TI) |
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LM9801 датащи(HTML) 32 Page - National Semiconductor (TI) |
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32 / 34 page ![]() Applications Information (Continued) Figure 25 shows a different technique for increasing the TR- w 1 guardband andor increasing the length of the TR pulse by stopping the s MCLK during the TR period When TR initially goes high the first one-shot (U1A) triggers effec- tively disabling the LM9801’s MCLK for 2 ms thereby lengthening the TR pulse width by 2 ms over the value programmed in the configuration register On the falling edge of TR the second one-shot (U1B) fires disabling the LM9801’s MCLK for 1 ms and increasing the TR-w1 guardband by that amount TLH12814 – 52 FIGURE 25 Stretching TR and the TR-w1 Guardband http www nationalcom 32 |
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