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WM8711LGEFL Datasheet(PDF) 28 Page - Wolfson Microelectronics plc |
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WM8711LGEFL Datasheet(HTML) 28 Page - Wolfson Microelectronics plc |
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28 / 44 page  WM8711L Production Data w PD, Rev 4.5, August 2011 28 The table below should be used to set up the device to work with the various sample rate combinations. Refer to Digital Filter Characteristics section for an explanation of the different filter types. SAMPLING RATE MCLK FREQUENCY SAMPLE RATE REGISTER SETTINGS DIGITAL FILTER TYPE DAC kHz MHz BOSR SR3 SR2 SR1 SR0 48 12.288 0 (256fs) 0 0 0 0 1 18.432 1 (384fs) 0 0 0 0 8 12.288 0 (256fs) 0 0 0 1 1 18.432 1 (384fs) 0 0 0 1 32 12.288 0 (256fs) 0 1 1 0 1 18.432 1 (384fs) 0 1 1 0 96 12.288 0 (128fs) 0 1 1 1 2 18.432 1 (192fs) 0 1 1 1 44.1 11.2896 0 (256fs) 1 0 0 0 1 16.9344 1 (384fs) 1 0 0 0 8 (Note 1) 11.2896 0 (256fs) 1 0 0 1 1 16.9344 1 (384fs) 1 0 0 1 88.2 11.2896 0 (128fs) 1 1 1 1 2 16.9344 1 (192fs) 1 1 1 1 Table 11 Normal Mode Sample Rate Look-up Table Notes: 1. 8k not exact, actual = 8.018kHz 2. 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 WM8711L digital signal processing is carried out at. In Normal mode, with BOSR = 0, the base over-sampling rate is at 256fs, with BOSR = 1, the base over-sampling rate is at 384fs. This can be used to determine the actual audio data rate required by the DAC. The exact sample rates achieved are defined by the relationships in Table 12 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 12 Normal Mode Actual Sample Rates |
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