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WM8742GEDS/V データシート(PDF) 33 Page - Cirrus Logic

部品番号 WM8742GEDS/V
部品情報  24-bit 192 kHz DAC with Advanced Digital Filtering
PDF  66 Pages
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メーカー  CIRRUS [Cirrus Logic]
ホームページ  http://www.cirrus.com
Logo CIRRUS - Cirrus Logic

WM8742GEDS/V データシート(HTML) 33 Page - Cirrus Logic

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WM8742
Rev 4.4
33
REGISTER ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
R4
Volume Control
04h
2
ATC
0
Attenuator Control Mode:
0 = Right channels use Right
attenuation
1 = Right Channels use Left
Attenuation
Table 26 Attenuator Control Mode
VOLUME RAMP MODE
There are two ways to change the volume in the WM8742, controlled by VOL_RAMP.
When
VOL_RAMP=0, the volume changes in a single step from the current volume setting to the new
volume when an update is applied to the gain control registers. When VOL_RAMP=1, the volume is
automatically ramped from the current volume setting to the new volume setting when an update is
applied to the volume control registers. The speed at which this happens is dependant on the sample
rate as shown in Table 27 below:
SAMPLE RATE (kHz)
RAMP RATE (ms/dB)
32
1.000
44.1
0.726
48
0.667
88.2
0.726
96
0.667
176.4
0.726
196
0.667
Table 27 Volume Ramp Rates
REGISTER ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
R4
Volume Control
04h
0
VOL_
RAMP
0
Volume ramp mode control:
0 = Apply volume change in a single
step.
1 = Ramp between current volume
setting and new volume setting.
Table 28 Volume Ramp Control
ANTI-CLIPPING DIGITAL ATTENUATION MODE
Audio material is regularly recorded up to 0dB level and heavily compressed. This may cause clipping
and occasional distortion when the digital media is applied to a DAC. In order to prevent this in the
WM8742, an anti-clipping mode is provided, which attenuates the digital signal by 2dB as it is
processed through the digital filters.
REGISTER ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
R4
Volume Control
04h
1
ATT2DB
0
Anti-clipping mode control:
0 = Off, 0dB attenuation
1 = On, 2dB attenuation applied
Table 29 Anti-Clipping Digital Attenuation Control



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