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WM8510GEDS/V 데이터시트(PDF) 49 Page - Wolfson Microelectronics plc |
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WM8510GEDS/V 데이터시트(HTML) 49 Page - Wolfson Microelectronics plc |
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49 / 56 page ![]() Product Preview WM8510 w PP Rev 1.2 December 2004 49 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 DACOSR12 8 0 DAC oversample rate select 0 = 64x (lowest power) 1 = 128x (best SNR) R14 ADC control 3 ADCOSR12 8 0 ADC oversample rate select 0 = 64x (lowest power) 1 = 128x (best SNR) Table 34 ADC and DAC Oversampling Rate Selection VMID The analogue circuitry will not work unless VMID is enabled (VMIDSEL 00). 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 VMIDSE L 00 Reference string impedance to VMID pin (detemines startup time): 00=off (open circuit) 01=75kΩ 10=300kΩ 11=2.5kΩ (for fastest startup) Table 35 VMID Impedance Control BIASEN REGISTER ADDRESS BIT LABEL DEFAULT DESCRIPTION R1 Power management 1 3 BIASEN 0 Analogue amplifier bias control Table 36 BIASEN Control |
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