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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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WM8351 датащи(PDF) 100 Page - Wolfson Microelectronics plc |
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WM8351 датащи(HTML) 100 Page - Wolfson Microelectronics plc |
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100 / 330 page  WM8351 Production Data w PD, April 2012, Rev 4.5 100 13.12.3 MID-RAIL REFERENCE (VMID) VMID provides a potential mid-way between AVDD and GND, used in many parts of the audio CODEC. It is generated from AVDD using on-chip potential dividers. Different resistor values can be selected for this purpose. A medium resistance should be used when the CODEC is active. A high resistance option provides a more power-efficient way to maintain the VMID voltage when the CODEC is in “Standby” (i.e. inactive but ready to start immediately, without needing to wait for the VMID capacitor to be charged). For startup and shutdown the VMID generator provides soft VMID ramping to reduce pops and clicks. The speed of this ramp is selectable using the anti-pop controls and can be tuned to the application. Figure 62 Generating the Mid-rail Reference ADDRESS BIT LABEL DEFAULT DESCRIPTION R8 (08h) Power Management 1 2 VMID_ENA 0 Enables VMID resistor string 0 = disabled, 1 = enabled 1:0 VMID [1:0] 00 (off) Resistor selection for VMID potential divider 00 = off 01 = VMID comes from 300kΩ R-string 10 = VMID comes from 50kΩ R-string 11 = VMID comes from 5kΩ R-string Table 50 Controlling the Mid-rail Reference |
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