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WM8731SEDS/V Folha de dados(PDF) 61 Page - Wolfson Microelectronics plc

Nome de Peças WM8731SEDS/V
Descrição Electrónicos  Portable Internet Audio CODEC with Headphone Driver and Programmable Sample Rates
PDF  65 Pages
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Fabricante Electrônico  WOLFSON [Wolfson Microelectronics plc]
Página de início  http://www.wolfsonmicro.com
Logo WOLFSON - Wolfson Microelectronics plc

WM8731SEDS/V Folha de dados(HTML) 61 Page - Wolfson Microelectronics plc

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WM8731 / WM8731L
Production Data
w
PD, Rev 4.9, October 2012
61
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 WM8731 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 WM8731 supplies.



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