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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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WM8985GEFL/R датащи(PDF) 91 Page - Wolfson Microelectronics plc |
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WM8985GEFL/R датащи(HTML) 91 Page - Wolfson Microelectronics plc |
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91 / 121 page  Production Data WM8985 w PD, Rev 4.6, July 2009 91 VMID The analogue circuitry will not operate unless VMID is enabled. The impedance of the VMID resistor string, together with the decoupling capacitor on the VMID pin will determine the start-up time of the VMID circuit. REGISTER ADDRESS BIT LABEL DEFAULT DESCRIPTION R1 (01h) Power management 1 1:0 VMIDSEL 00 Reference string impedance to VMID pin 00 = off (250kΩ VMID to AGND1) 01=75kΩ 10=300kΩ 11=5kΩ Table 51 VMID Impedance Control BIASEN The analogue amplifiers will not operate unless BIASEN is enabled. REGISTER ADDRESS BIT LABEL DEFAULT DESCRIPTION R1 (01h) Power management 1 3 BIASEN 0 Analogue amplifier bias control 0 = disabled 1 = enabled Table 52 Analogue Bias Control POP MINIMISATION POBCTRL WM8985 has two bias generators. A noisy bias derived from AVDD and a low noise bias derived from VMID. POBCTRL is use to switch between the two bias generators. During power up, the AVDD derived bias is available as soon as AVDD is applied; the VMID derived bias is available once the VMID node has charged up. REGISTER ADDRESS BIT LABEL DEFAULT DESCRIPTION R42 OUT4 to ADC 2 POB CTRL 0 VMID independent current bias control 0 = Disable VMID independent current bias 1 = Enable VMID independent current bias Note: POBCTRL should be asserted during power up to minimize pops and then de- asserted at the end of the power up sequence to give best performance. Refer to Recommended Power Up/Down |
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