WM8980CGEFL/RV WOLFSON [Wolfson Microelectronics plc], WM8980CGEFL/RV Datasheet - Page 26

• Manufacturer Part Number: WM8980CGEFL/RV
• Description: Stereo CODEC with Speaker Driver and Video Buffer
• Manufacturer: WOLFSON [Wolfson Microelectronics plc]

WM8980
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VOLUME UPDATES
Figure 10 Simultaneous Left and Right Volume Updates
Figure 11 Click Noise During Volume Update
Volume settings will not be applied to the PGAs until a ‘1’ is written to one of the INPPGAUPDATE
bits. This is to allow left and right channels to be updated at the same time, as shown in Figure 10.
If the volume is adjusted while the signal is a non-zero value, an audible click can occur as shown in
Figure 11.
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 12.
PP, Rev 3.8, May 2012
Pre-Production
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