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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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WM8741 датащи(PDF) 40 Page - Wolfson Microelectronics plc |
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WM8741 датащи(HTML) 40 Page - Wolfson Microelectronics plc |
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40 / 63 page  WM8741 Product Preview w PP Rev 1.3 October 2007 40 OVERSAMPLING RATE CONTROL The user has control of the oversampling ratio of the WM8741, and can set to the device to operate in low, medium or high rate modes. For optimum operation of the digital filtering and other processing on the WM8741, the user must ensure the correct value of OSR[1:0] is set at all times. PIN NAME DESCRIPTION 25 OSR/DSDR Oversampling Rate Selection 0 = Low rate (32/44.1/48kHz) Z = Medium rate (88.2/96kHz) 1 = High rate (176.4/192kHz) Table 45 OSR/DSDR Hardware Control Pin Function MUTE PIN A soft mute can be applied to the WM8741 in the digital domain in all PCM. A logic low on the MUTEB pin will cause the attenuation to ramp to infinite attenuation at a rate of 1022x(4/fs). Setting MUTEB high will return the signal gain to its previous value. Figure 26 shows the soft mute characteristic. In DSD Direct mode the MUTEB pin controls the analogue mute in the DAC. This analogue mute is a ‘hard’ mute and is applied and released as soon as the MUTEB pin is toggled. PIN NAME DESCRIPTION 25 MUTEB/ SDOUT Mute control 0 = Mute on (no output) 1 = Mute off (normal operation Table 46 MUTEB Hardware Control Pin Function 0 0.02 0.04 0.06 0.08 0.1 0.12 0.14 Time (s) Figure 26 Hardware Control Mode Soft Mute Characteristic |
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