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WM8734 Datasheet(PDF) 43 Page - Wolfson Microelectronics plc |
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WM8734 Datasheet(HTML) 43 Page - Wolfson Microelectronics plc |
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43 / 46 page  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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