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WM8281ECS/R 数据表(PDF) 287 Page - Cirrus Logic |
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WM8281ECS/R 数据表(HTML) 287 Page - Cirrus Logic |
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287 / 392 page  WM8281 Rev 4.0 287 SPREAD SPECTRUM FLL CONTROL The WM8281 can apply modulation to the FLL outputs, using spread spectrum techniques. This can be used to control the EMI characteristics of the circuits that are clocked via the FLLs. Each of the FLLs can be individually configured for Triangle modulation, Zero Mean Frequency Modulation (ZMFM) or Dither. The amplitude and frequency parameters of the spread spectrum functions is also programmable, using the registers described in Table 109. REGISTER ADDRESS BIT LABEL DEFAULT DESCRIPTION R393 (0189h) FLL1 Spread Spectrum 5:4 FLL1_SS_AMPL [1:0] 00 FLL1 Spread Spectrum Amplitude Controls the extent of the spread- spectrum modulation. 00 = 0.7% (triangle), 0.7% (ZMFM, dither) 01 = 1.1% (triangle), 1.3% (ZMFM, dither) 10 = 2.3% (triangle), 2.6% (ZMFM, dither) 11 = 4.6% (triangle), 5.2% (ZMFM, dither) 3:2 FLL1_SS_FREQ [1:0] 00 FLL1 Spread Spectrum Frequency Controls the spread spectrum modulation frequency in Triangle mode. 00 = 439kHz 01 = 878kHz 10 = 1.17MHz 11 = 1.76MHz 1:0 FLL1_SS_SEL [1:0] 00 FLL1 Spread Spectrum Select 00 = Disabled 01 = Zero Mean Frequency (ZMFM) 10 = Triangle 11 = Dither R425 (01A9h) FLL2 Spread Spectrum 5:4 FLL2_SS_AMPL [1:0] 00 FLL2 Spread Spectrum Amplitude Controls the extent of the spread- spectrum modulation. 00 = 0.7% (triangle), 0.7% (ZMFM, dither) 01 = 1.1% (triangle), 1.3% (ZMFM, dither) 10 = 2.3% (triangle), 2.6% (ZMFM, dither) 11 = 4.6% (triangle), 5.2% (ZMFM, dither) 3:2 FLL2_SS_FREQ [1:0] 00 FLL2 Spread Spectrum Frequency Controls the spread spectrum modulation frequency in Triangle mode. 00 = 439kHz 01 = 878kHz 10 = 1.17MHz 11 = 1.76MHz 1:0 FLL2_SS_SEL [1:0] 00 FLL2 Spread Spectrum Select 00 = Disabled 01 = Zero Mean Frequency (ZMFM) 10 = Triangle 11 = Dither Table 109 FLL Spread Spectrum Control |
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