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WM8961GEFL/V Datasheet(PDF) 52 Page - Wolfson Microelectronics plc |
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WM8961GEFL/V Datasheet(HTML) 52 Page - Wolfson Microelectronics plc |
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52 / 116 page  WM8961 Pre-Production w PP, August 2009, Rev 3.1 52 If a volume update is attempted while the signal is a non-zero value, an audible click could occur as shown in Figure 24. Figure 24 Click Noise during Volume Update In order to prevent this click noise, a zero cross function is provided. When enabled, this will cause the PGA volume to update only when a zero crossing occurs, minimising click noise as shown in Figure 25. Figure 25 volume Update using Zero Cross Detection If there is a long period where no zero-crossing occurs, a timeout circuit in the WM8961 will automatically update the volume. The volume updates will occur between one and two timeout periods, depending on when the volume update bit is set as shown in Figure 26. The TOEN register bit must be set to enable this timeout function. The timeout period is set by CLK_TO_DIV[1:0]. |
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