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WM8960CGEFL/V датащи(PDF) 46 Page - Cirrus Logic

номер детали WM8960CGEFL/V
подробное описание детали  Speaker and Headphone Drivers for Portable Audio Applications
PDF  94 Pages
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производитель  CIRRUS [Cirrus Logic]
домашняя страница  http://www.cirrus.com
Logo CIRRUS - Cirrus Logic

WM8960CGEFL/V датащи(HTML) 46 Page - Cirrus Logic

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WM8960
46
Rev 4.4
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.
Write Left
Volume
Update
bit = 0
Write
Right
Volume
Update
bit = 1
Left PGA Input
Right PGA Input
Control Interface
Time
Left PGA Output
Right PGA Output
Write Right PGA Volume
with update
Write Left PGA Volume
without update
0dB Gain
6dB Gain
Zero crossings cause
volume updates
Figure 18 Volume Update using Zero Cross Detection
If there is a long period where no zero-crossing occurs, a timeout circuit in the WM8960 will
automatically update the volume. The volume updates will occur between one and two timeout
periods, depending on when the volume update bit is set as shown in Figure 19. The TOEN register
bit must be set to enable this timeout function. The timeout period is set by TOCLKSEL.
Write Left
Volume
Update
bit = 0
Write
Right
Volume
Update
bit = 1
Left PGA Input
Right PGA Input
Control Interface
Time
Left PGA Output
Right PGA Output
Write Right PGA Volume
with update
Write Left PGA Volume
without update
Timeout Counter
Timeout causes
volume update
Zero crossing causes
volume update
No zero crossing
SYSCLK/221 or SYSCLK/219,
depending on TOCLKSEL
Figure 19 Volume Update after Timeout



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