WM8985_07 WOLFSON [Wolfson Microelectronics plc], WM8985_07 Datasheet - Page 32

• Manufacturer Part Number: WM8985_07
• Description: Multimedia CODEC With Class D Headphone and Line Out
• Manufacturer: WOLFSON [Wolfson Microelectronics plc]

WM8985
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VOLUME UPDATES
Figure 13 Simultaneous Left and Right Volume Updates
Figure 14 Click Noise During Volume Update
Volume settings will not be applied to the PGAs until a '1' is written to one of the INPPGAVU bits.
This is to allow left and right channels to be updated at the same time, as shown in Figure 13.
If the volume is adjusted while the signal is a non-zero value, an audible click can occur as shown in
Figure 14.
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 15.
PP, Rev 3.5, March 2007
Pre-Production
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