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Motore di ricerca datesheet componenti elettronici |
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Motore di ricerca datesheet componenti elettronici |
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WM8721 Scheda tecnica(PDF) 23 Page - Wolfson Microelectronics plc |
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WM8721 Scheda tecnica(HTML) 23 Page - Wolfson Microelectronics plc |
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23 / 34 page  WM8721 Product Preview WOLFSON MICROELECTRONICS LTD PP Rev 1.3 November 2000 23 USB MODE SAMPLE RATES In USB mode the MCLK input is 12MHz only. SAMPLING RATE DAC MCLK FREQUENCY SAMPLE RATE REGISTER SETTINGS DIGITAL FILTER TYPE KHz MHz BOSR SR3 SR2 SR1 SR0 48 12.000 0 0 0 0 0 0 44.1 (Note 2) 12.000 1 1 0 0 0 1 8 12.000 0 0 0 0 1 0 8 (Note 1) 12.000 1 1 0 0 1 1 32 12.000 0 0 1 1 0 0 96 12.000 0 0 1 1 1 3 88.2 (Note 3) 12.000 1 1 1 1 1 2 Table 13 USB Mode Sample Rate Look-up Table Notes: 1. 8k not exact, actual = 8.021kHz 2. 44.1k not exact, actual = 44.118kHz 3. 88.1k not exact, actual = 88.235kHz 4. All other combinations of BOSR and SR[3:0] that are not in the truth table are invalid The BOSR bit represents the base over-sampling rate. This is the rate that the WM8721 digital signal processing is carried out at and the sampling rate will always be a sub-multiple of this. In USB mode, with BOSR = 0, the base over-sampling rate is defined at 250Fs, with BOSR = 1, the base over- sampling rate is defined at 272Fs. This can be used to determine the actual audio sampling rate required by the DAC. The exact sample rates supported for all combinations are defined by the relationships in Table 14 below. ACTUAL SAMPLING RATE TARGET SAMPLING RATE BOSR=0 ( 250FS) BOSR=1 (272FS) KHz KHz KHz 8 8.021 8 12MHz/(250 x 48/8) 12MHz/(272 x 11/2) 32 32 12MHz/(250 x 48/32) not available 44.117 44.1 not available 12MHz/272 48 48 12MHz/250 not available 88.235 88.2 not available 12MHz/136 96 96 12MHz/125 not available Table 14 USB Mode Actual Sample Rates |
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