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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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WM8976CGEFL/V датащи(PDF) 84 Page - Wolfson Microelectronics plc |
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WM8976CGEFL/V датащи(HTML) 84 Page - Wolfson Microelectronics plc |
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84 / 114 page  WM8976 Production Data w PD, Rev 4.5, November 2011 84 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 67 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 determines startup time): 00=off (open circuit) 01=75kΩ 10=300kΩ 11=5kΩ (for fastest startup) Table 68 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 69 Analogue Bias Control |
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