WM8522
Production Data
SOFTMUTE
The digital muting function used in Software and Hardware mode applies a softmute with the
operating characteristics shown in Figure 19.
1.5
1
0.5
0
-0.5
-1
-1.5
-2
-2.5
0
0.001
0.002
0.003
0.004
0.005
0.006
Time(s)
Figure 19 Soft Mute Operation
When the softmute is applied the output of the device will decay towards VMID with a time constant of
approximately 64 input samples. When the mute is released, either manually or automatically by the
chip, the output will restart immediately from the current input sample.
ANALOGUE MUTE
Analogue mute can only be used in software mode and will cause the output of the selected DAC to
perform an analogue mute that clamps the output of the DAC to VMID. This function is dependent in
the IZD bit which is described in section INFINITE ZERO DETECT, later.
PD Rev 4.0 July 2006
22
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WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
