WM8776SEFT/V Wolfson Microelectronics, WM8776SEFT/V Datasheet - Page 27

• Manufacturer Part Number: WM8776SEFT/V
• Description: Audio CODECs Stereo CODEC with 5-Ch Mux
• Manufacturer: Wolfson Microelectronics

Specifications of WM8776SEFT/V

• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Package / Case: TQFP-48
• Minimum Operating Temperature: - 25 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Production Data
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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.
MUTE MODES
Setting MUTE for the DAC will apply a ‘soft’ mute to the input of the digital filters of the channel
muted.
Figure 22 Application and Release of Soft Mute
Figure 22 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 V
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.
ADC Oversampling Rate
REGISTER ADDRESS
REGISTER ADDRESS
-0.5
-1.5
-2.5
1.5
0.5
-1
-2
1
0
0
R12 (0Ch)
DAC Mute
0001100
R8 (08h)
0001000
MID
with a time constant of approximately 64 input samples. If DMUTE is applied to both
0.001
BIT
BIT
3
0
0.002
ADCOSR
DMUTE
LABEL
LABEL
Time(s)
DEFAULT
DEFAULT
0.003
0
0
ADC oversampling rate select
DAC Soft Mute select
0.004
0 : Normal Operation
1: Soft mute enabled
0: 128x oversampling
1: 64x oversampling
PD, Rev 4.1, September 2008
DESCRIPTION
DESCRIPTION
0.005
WM8776
0.006
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