WM8591
Product Preview
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 20 Application and Release of Soft Mute
Figure 20 shows the application and release of DMUTE whilst a full amplitude sinusoid is being
played at 48kHz sampling rate. When DMUTE (lower trace) is asserted, the output (upper trace)
begins to decay exponentially from the DC level of the last input sample. The output will decay
towards VMID with a time constant of approximately 64 input samples. If DMUTE is applied to both
channels for 1024 or more input samples the DAC will be muted if IZD is set. When DMUTE is de-
asserted, the output will restart immediately from the current input sample.
Note that all other means of muting the DAC: setting the PL[3:0] bits to 0, setting the PDWN bit or
setting attenuation to 0 will cause much more abrupt muting of the output.
PP Rev 1.0 May 2005
26
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WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
