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WM8941 数据表(PDF) 73 Page - Wolfson Microelectronics plc |
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WM8941 数据表(HTML) 73 Page - Wolfson Microelectronics plc |
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73 / 96 page  Pre Production WM8941 w PP, Rev 3.3, December 2007 73 Notes: 1. This step enables the internal device bias buffer and the VMID buffer for unassigned inputs/outputs. This will provide a startup reference for all inputs and outputs. This will cause the inputs and outputs to ramp towards VMID in a way that is controlled and predictable. 2. Choose the value of VMIDSEL bits based on the startup time (VMIDSEL = 10 for the slowest startup, VMIDSEL = 11 for the fastest startup). Startup time is defined by the value of the VMIDSEL bits (the reference impedance) and the external decoupling capacitor on VMID. In addition to the power on sequence, it is recommended that the zero cross functions are used when changing the volume in the PGAs to avoid any audible pops and clicks. |
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