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WM8904ECS/R 데이터시트(PDF) 70 Page - Wolfson Microelectronics plc |
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WM8904ECS/R 데이터시트(HTML) 70 Page - Wolfson Microelectronics plc |
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70 / 188 page ![]() WM8904 Pre-Production w PP, Rev 3.3, September 2012 70 DAC SLOPING STOPBAND FILTER Two DAC filter types are available, selected by the register bit DAC_SB_FILT. When operating at sample rates <= 24kHz (eg. during voice communication) it is recommended that the sloping stopband filter type is selected (DAC_SB_FILT=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 R33 (21h) DAC Digital 1 11 DAC_SB_FILT 0 Selects DAC filter characteristics 0 = Normal mode 1 = Sloping stopband mode (recommended when fs 24kHz Table 38 DAC Sloping Stopband Filter DAC OVERSAMPLING RATIO (OSR) The DAC oversampling rate is programmable to allow power consumption versus audio performance trade-offs. The default oversampling rate is low for reduced power consumption; using the higher OSR setting improves the DAC signal-to-noise performance. REGISTER ADDRESS BIT LABEL DEFAULT DESCRIPTION R33 (21h) DAC Digital 1 6 DAC_OSR128 0 DAC Oversample Rate Select 0 = Low power (normal OSR) 1 = High performance (double OSR) Table 39 DAC Oversampling Control |
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