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WM8771
ADC OVERSAMPLING RATE SELECT
For ADC operation at 96kHz it is recommended that the user set the ADCOSR bit. This changes the
ADC signal processing oversample rate to 64fs.
REGISTER ADDRESS
BIT
3
LABEL
DEFAULT
0
DESCRIPTION
10111
ADCOSR
ADC oversampling rate select
0: 128x oversampling
ADC Oversampling Rate
1: 64x oversampling
MUTE MODES
The WM8771 has individual mutes for each of the four DAC channels. Setting MUTE for a channel
will apply a ‘soft’ mute to the input of the digital filters of the channel muted. The WM8770 has
individual mutes for each of the four DAC channels. Setting MUTE for a channel will apply a ‘soft’
mute to the input of the digital filters of the channel muted. DMUTE[0] mutes DAC channel 1,
DMUTE[1] mutes DAC channel 2, DMUTE[2] mutes DAC channel 3 & DMUTE[3] mutes DAC
channel 4.
REGISTER ADDRESS
BIT
LABEL
DEFAULT
0
DESCRIPTION
DAC Soft Mute select
10100
3:0 DMUTE[3:0]
DAC Mute
0 : Normal Operation
1: Soft mute enabled
Setting the MUTEALL register bit will apply a 'soft' mute to the input of all the DAC digital filters:
REGISTER ADDRESS
BIT
4
LABEL
DEFAULT
0
DESCRIPTION
Soft Mute select
10100
MUTEALL
DAC Mute
0 : Normal Operation
1: Soft mute all channels
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 21 Application and Release of Soft Mute
PP Rev 2.0 December 2001
25
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WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
