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WM8734 bảng dữ liệu(PDF) 43 Page - Wolfson Microelectronics plc

tên linh kiện WM8734
Giải thích chi tiết về linh kiện  Stereo Audio CODEC
PDF  46 Pages
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nhà sản xuất  WOLFSON [Wolfson Microelectronics plc]
Trang chủ  http://www.wolfsonmicro.com
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WM8734 bảng dữ liệu(HTML) 43 Page - Wolfson Microelectronics plc

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WM8734
Production Data
w
PD Rev 4.1 November 2006
43
MINIMISING POP NOISE AT THE ANALOGUE OUTPUTS
To minimise any pop or click noise when the system is powered up or down, the following procedures
are recommended.
POWER UP SEQUENCE
•
Switch on power supplies. By default the WM8734 is in Standby Mode, the DAC is
digitally muted and the Audio Interface and Outputs are all OFF.
•
Set all required bits in the Power Down register (0Ch) to ‘0’; EXCEPT the OUTPD
bit, this should be set to ‘1’ (Default).
•
Set required values in all other registers except 12h (Active).
•
Set the ‘Active’ bit in register 12h.
•
The last write of the sequence should be setting OUTPD to ‘0’ (active) in register
0Ch, enabling the DAC signal path, free of any significant power-up noise.
POWER DOWN SEQUENCE
•
Set the OUTPD bit to ‘1’ (power down).
•
Remove the WM8734 supplies.



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