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WM8778SEDS/R 데이터시트(PDF) 16 Page - Wolfson Microelectronics plc |
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WM8778SEDS/R 데이터시트(HTML) 16 Page - Wolfson Microelectronics plc |
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16 / 50 page ![]() WM8778 Production Data w PD Rev 4.0 April 2005 16 for 192kHz operation where the oversampling rate is 64fs. For ADC operation at 96kHz it is recommended that the user set the ADCOSR bit. This changes the ADC signal processing oversample rate to 64fs. System Clock Frequency (MHz) 128fs 192fs SAMPLING RATE (DACLRC/ ADCLRC) DAC ONLY 256fs 384fs 512fs 768fs 32kHz 4.096 6.144 8.192 12.288 16.384 24.576 44.1kHz 5.6448 8.467 11.2896 16.9340 22.5792 33.8688 48kHz 6.144 9.216 12.288 18.432 24.576 36.864 96kHz 12.288 18.432 24.576 36.864 Unavailable Unavailable 192kHz 24.576 36.864 Unavailable Unavailable Unavailable Unavailable Table 6 System Clock Frequencies Versus Sampling Rate In Master mode DACBCLK, ADCBCLK, DACLRC and ADCLRC are generated by the WM8778. The frequencies of ADCLRC and DACLRC are set by setting the required ratio of DACMCLK to DACLRC and ADCMCLK to ADCLRC using the DACRATE and ADCRATE control bits (Table 7). ADCRATE[2:0]/ DACRATE[2:0] ADCMCLK/DACMCLK: ADCLRC/DACLRC RATIO 000 128fs (DAC Only) 001 192fs (DAC Only) 010 256fs 011 384fs 100 512fs 101 768fs Table 7 Master Mode MCLK:ADCLRC/DACLRC Ratio Select Table 8 shows the settings for ADCRATE and DACRATE for common sample rates and ADCMCLK/DACMCLK frequencies. System Clock Frequency (MHz) 128fs 192fs 256fs 384fs 512fs 768fs SAMPLING RATE (DACLRC/ ADCLRC) DACRATE =000 DACRATE =001 ADCRATE/ DACRATE =010 ADCRATE/ DACRATE =011 ADCRATE/ DACRATE =100 ADCRATE/ DACRATE =101 32kHz 4.096 6.144 8.192 12.288 16.384 24.576 44.1kHz 5.6448 8.467 11.2896 16.9340 22.5792 33.8688 48kHz 6.144 9.216 12.288 18.432 24.576 36.864 96kHz 12.288 18.432 24.576 36.864 Unavailable Unavailable 192kHz 24.576 36.864 Unavailable Unavailable Unavailable Unavailable Table 8 Master Mode ADC/DACLRC Frequency Selection |
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