wm8961 Wolfson Microelectronics plc, wm8961 Datasheet - Page 48

• Manufacturer Part Number: wm8961
• Description: Ultra-low Power Stereo Codec With 1w Stereo Class D Speaker Drivers And Ground Referenced Headphone Drivers
• Manufacturer: Wolfson Microelectronics plc

WM8961
Pre-Production
SPEAKER OUTPUT PGA VOLUME CONTROL
The signal volume on SPK_L and SPK_R can be independently adjusted under software control by
writing to SPKLVOL and SPKRVOL, as shown in Figure 21.
Figure 21 Speaker Volume PGA
A zero cross detect on the analogue output may also be enabled when changing the gain setting to
minimize audible clicks and zipper noise as the gain updates. If zero cross is enabled a timeout is also
available to update the gain if a zero cross does not occur. This function may be enabled by setting
TOEN in register R23 (17h). The timeout period is set by CLK_TO_DIV[1:0]. The volume control
PGAs are enabled using SPKL_PGA and SPKR_PGA.
PP, August 2009, Rev 3.1
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