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WM8941 データシート(PDF) 73 Page - Wolfson Microelectronics plc

部品番号 WM8941
部品情報  Mono CODEC with Speaker Driver and Video Buffer
PDF  96 Pages
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メーカー  WOLFSON [Wolfson Microelectronics plc]
ホームページ  http://www.wolfsonmicro.com
Logo WOLFSON - Wolfson Microelectronics plc

WM8941 データシート(HTML) 73 Page - Wolfson Microelectronics plc

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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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