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WM8591GEDS/RV Folha de dados(PDF) 29 Page - Wolfson Microelectronics plc

Nome de Peças WM8591GEDS/RV
Descrição Electrónicos  24 BIT, 192 KHZ STEREO CODEC
PDF  50 Pages
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Fabricante Electrônico  WOLFSON [Wolfson Microelectronics plc]
Página de início  http://www.wolfsonmicro.com
Logo WOLFSON - Wolfson Microelectronics plc

WM8591GEDS/RV Folha de dados(HTML) 29 Page - Wolfson Microelectronics plc

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WM8591
w
PP Rev 1.0 May 2005
29
DAC DIGITAL VOLUME CONTROL
The DAC volume may also be adjusted in the digital domain using independent digital attenuation
control registers
REGISTER
ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
7:0
LDA[7:0]
11111111
(0dB)
Digital Attenuation data for Left channel DACL in 0.5dB steps. See
Table 11
R3 (03h)
0000011
Digital
Attenuation
DACL
8
UPDATED
Not latched
Controls simultaneous update of Attenuation Latches
0: Store LDA in intermediate latch (no change to output)
1: Store LDA and update attenuation on both channels
7:0
RDA[6:0]
11111111
(0dB)
Digital Attenuation data for Right channel DACR in 0.5dB steps. See
Table 11
R4 (04h)
0000100
Digital
Attenuation
DACR
8
UPDATED
Not latched
Controls simultaneous update of Attenuation Latches
0: Store RDA in intermediate latch (no change to output)
1: Store RDA and update attenuation on both channels.
7:0
MDA[7:0]
11111111
(0dB)
Digital Attenuation data for DAC channels in 0.5dB steps. See Table
11
R5 (05h)
0000101
Master
Digital
Attenuation
(both channels)
8
UPDATED
Not latched
Controls simultaneous update of Attenuation Latches
0: Store gain in intermediate latch (no change to output)
1: Store gain and update attenuation on channels.
L/RDA[7:0]
ATTENUATION LEVEL
00(hex)
-
∞ dB (mute)
01(hex)
-127dB
:
:
:
:
:
:
FE(hex)
-0.5dB
FF(hex)
0dB
Table 11 Digital Volume Control Attenuation Levels
The digital volume control also incorporates a zero cross detect circuit which detects a transition
through the zero point before updating the digital volume control with the new volume. This is
enabled by control bit DZCEN.
REGISTER ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
R7 (07h)
0000111
DAC Control
0
DZCEN
0
DAC Digital Volume Zero Cross
Enable:
0: Zero cross detect disabled
1: Zero cross detect enabled
DAC OUTPUT PHASE
The DAC Phase control word determines whether the output of the DAC is non-inverted or inverted
REGISTER ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
Bit
DAC
Phase
0
DACL
1 = invert
R6 (06h)
0000110
DAC Phase
1:0
PHASE
[1:0]
00
1
DACR
1 = invert



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