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CS4331 数据表(PDF) 13 Page - Cirrus Logic |
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CS4331 数据表(HTML) 13 Page - Cirrus Logic |
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13 / 38 page ![]() mended on the analog outputs. The required ca- pacitor value is defined by: C = 1 (2π) (Fs) (2400 Ω) (2) Example: Fs = 48 kHz C = 690 pF A value of 680 pF may be used with only 1.45% error which is negligible. Combined Digital and Analog Filter Response The frequency response of the combined analog switched-capacitor filter, digital filter, and off- chip single pole RC-filter at 2 Fs, is shown in Figures 9, 10, 11, and 12. The overall response is clock dependent and will scale with Fs. Note that the response plots have been normalized to Fs and can be de-normalized by multiplying the X-axis scale by Fs. Figure 9. CS4330/31/33 Combined Digital and Analog Filter Stopband Rejection Figure 10. CS4330/31/33 Combined Digital and Analog Filter Transition Band Figure 11. CS4330/31/33 Combined Digital and Analog Filter Transition Band Figure 12. CS4330/31/33 Combined Digital and Analog Filter Passband Ripple CS4330, CS4331, CS4333 DS136F1 13 |
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