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WM8731SEDS/V 数据表(PDF) 43 Page - Wolfson Microelectronics plc |
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WM8731SEDS/V 数据表(HTML) 43 Page - Wolfson Microelectronics plc |
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43 / 65 page ![]() WM8731 / WM8731L Production Data w PD, Rev 4.9, October 2012 43 The exact sample rates achieved are defined by the relationships in Table 19 below. TARGET SAMPLING RATE ACTUAL SAMPLING RATE BOSR=0 BOSR=1 MCLK=12.288 MCLK=11.2896 MCLK=18.432 MCLK=16.9344 kHz kHz kHz kHz kHz 8 8 8.018 8 8.018 (12.288MHz/256) x 1/6 (11.2896MHz/256) x 2/11 (18.432MHz/384) x 1/6 (16.9344MHz/384) x 2/11 32 32 not available 32 not available (12.288MHz/256) x 2/3 (18.432MHz/384) x 2/3 44.1 not available 44.1 not available 44.1 11.2896MHz/256 16.9344MHz /384 48 48 not available 48 not available 12.288MHz/256 18.432MHz/384 88.2 not available 88.2 not available 88.2 (11.2896MHz/256) x 2 (16.9344MHz /384) x 2 96 96 not available 96 not available (12.288MHz/256) x 2 (18.432MHz/384) x 2 Table 19 Normal Mode Actual Sample Rates 128/192fs NORMAL MODE The Normal Mode sample rates are designed for standard 256fs and 384fs MCLK rates. However the WM8731/L is also capable of being clocked from a 128 or 192fs MCLK for application over limited sampling rates as shown in the table below. SAMPLING RATE MCLK FREQUENCY SAMPLE RATE REGISTER SETTINGS DIGITAL FILTER TYPE ADC DAC kHz kHz MHz BOSR SR3 SR2 SR1 SR0 48 48 6.144 0 0 1 1 1 2 9.216 1 0 1 1 1 44.1 44.1 5.6448 0 1 1 1 1 2 8.4672 1 1 1 1 1 Table 20 128fs Normal Mode Sample Rate Look-up Table 512/768fs NORMAL MODE 512 fs and 768 fs MCLK rates can be accommodated by using the CLKIDIV2 bit (Register 8, bit 6). The core clock to the DSP will be divided by 2 so an external 512/768 fs MCLK will become 256/384 fs internally and the device otherwise operates as in Table 18 but with MCLK at twice the specified rate. See Table 17 for software control. |
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