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WM8758B Datasheet(PDF) 29 Page - Wolfson Microelectronics plc

Part # WM8758B
Description  Stereo CODEC with Headphone Driver and Line Out
PDF  90 Pages
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Manufacturer  WOLFSON [Wolfson Microelectronics plc]
Direct Link  http://www.wolfsonmicro.com
Logo WOLFSON - Wolfson Microelectronics plc

WM8758B Datasheet(HTML) 29 Page - Wolfson Microelectronics plc

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Production Data
WM8758B
w
PD, Rev 4.4, January 2012
29
VOLUME UPDATES
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.
Figure 13 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 14.
Figure 14 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, equalizer click noise as shown in
Figure 15.



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