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WM8945 Datasheet(PDF) 48 Page - Wolfson Microelectronics plc |
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WM8945 Datasheet(HTML) 48 Page - Wolfson Microelectronics plc |
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48 / 169 page  WM8945 Production Data w PD, May 2011, Rev 4.1 48 DAC AUTO-MUTE The DAC digital mute and volume controls are described earlier in Table 24. The DAC also incorporates an analogue auto-mute, which is enabled by setting DAC_AUTOMUTE. When the auto-mute is enabled, and a series of 1024 consecutive zero-samples is detected, the DAC output is muted in order to attenuate noise that might be present in output signal path. The DAC resumes normal operation as soon as digital audio data is detected. REGISTER ADDRESS BIT LABEL DEFAULT DESCRIPTION R21 (15h) DAC Control 1 4 DAC_AUTOMUTE 1 DAC Auto-Mute Control 0 = Disabled 1 = Enabled Table 26 DAC Auto Mute Note: The DAC_AUTOMUTE bit should not be set when the BEEP generator is used. DAC SLOPING STOPBAND FILTER Two DAC filter types are available, selected by the register bit DAC_SB_FLT. When operating at lower sample rates (e.g. during voice communication) it is recommended that the sloping stopband filter type is selected (DAC_SB_FLT=1) to reduce out-of-band noise which can be audible at low DAC sample rates. See “Digital Filter Characteristics” for details of DAC filter characteristics. REGISTER ADDRESS BIT LABEL DEFAULT DESCRIPTION R22 (16h) DAC Control 2 0 DAC_SB_FLT 0 Selects DAC filter characteristics 0 = Normal mode 1 = Sloping stopband mode Table 27 DAC Sloping Stopband Filter |
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