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MF6 датащи(PDF) 17 Page - National Semiconductor (TI) |
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MF6 датащи(HTML) 17 Page - National Semiconductor (TI) |
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17 / 20 page ![]() 2.0 Designing with the MF6 (Continued) 2.4 CHANGING CLOCK FREQUENCY INSTANTANEOUSLY The MF6 will respond favorably to a sudden change in clock frequency. Distortion in the output signal occurs at the tran- sition of the clock frequency and lasts approximately three cutoff frequency (f c) cycles. As shown in Figure 17,ifthe control signal is low the MF6-50 has a 100 kHz clock making f c = 2 kHz; when this signal goes high the clock frequency changes to 50 kHz yielding 1 kHz f c. The transient response of the MF6 seen in Figure 18 is also dependent on the f c and thus the fCLK applied to the filter. The MF6 responds as a classical sixth order Butterworth lowpass filter. DS005065-28 FIGURE 15. “Notch” Filter DS005065-29 FIGURE 16. MF6-50 “Notch” Filter Amplitude Response www.national.com 17 |
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