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WM8978CGEFL/V データシート(PDF) 88 Page - Wolfson Microelectronics plc |
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WM8978CGEFL/V データシート(HTML) 88 Page - Wolfson Microelectronics plc |
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88 / 118 page  WM8978 Production Data w PD, Rev 4.5, October 2011 88 POWER MANAGEMENT SAVING POWER BY REDUCING OVERSAMPLING RATE The default mode of operation of the ADC and DAC digital filters is in 64x oversampling mode. Under the control of ADCOSR and DACOSR the oversampling rate may be doubled. 64x oversampling results in a slight decrease in noise performance compared to 128x but lowers the power consumption of the device. REGISTER ADDRESS BIT LABEL DEFAULT DESCRIPTION R10 DAC control 3 DACOSR128 0 DAC oversample rate select 0 = 64x (lowest power) 1 = 128x (best SNR) R14 ADC control 3 ADCOSR128 0 ADC oversample rate select 0 = 64x (lowest power) 1 = 128x (best SNR) Table 66 ADC and DAC Oversampling Rate Selection VMID The analogue circuitry will not work when VMID is disabled (VMIDSEL[1:0] = 00b). The impedance of the VMID resistor string, together with the decoupling capacitor on the VMID pin will determine the startup time of the VMID circuit. REGISTER ADDRESS BIT LABEL DEFAULT DESCRIPTION R1 Power management 1 1:0 VMIDSEL 00 Reference string impedance to VMID pin (recommended startup time): 00=off (open circuit) 01=75kΩ 10=300kΩ 11=5kΩ (for fastest startup) Table 67 VMID Impedance Control BIASEN The analogue amplifiers will not operate unless BIASEN is enabled. REGISTER ADDRESS BIT LABEL DEFAULT DESCRIPTION R1 Power management 1 3 BIASEN 0 Analogue amplifier bias control 0=disabled 1=enabled Table 68 Analogue Bias Control |
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