WM8960_06 Datasheet, PDF (42/88 Pages) Wolfson Microelectronics plc – Stereo CODEC with 1W Stereo Class D Speaker Drivers and Headphone Drivers for Portable Audio Applications

WM8960
Preliminary Technical Data
VOLUME UPDATES
Volume settings will not be applied to input or output PGAs until a '1' is written to one of the update
bits (IPVU, OUT1VU, SPKVU bits). This is to allow left and right channels to be updated at the same
time, as shown in Figure 16.
Figure 16 Simultaneous Left and Right Volume Updates
If the volume is adjusted while the signal is a non-zero value, an audible click can occur as shown in
Figure 17.
Figure 17 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 18.
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PTD, September 2006, Rev 2.0
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