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WM8774IFT Arkusz danych(PDF) 25 Page - Wolfson Microelectronics plc

Numer części WM8774IFT
Szczegółowy opis  24 - bit, 192kHz 8 - Channel Input Stereo Codec
PDF  42 Pages
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Producent  WOLFSON [Wolfson Microelectronics plc]
Strona internetowa  http://www.wolfsonmicro.com
Logo WOLFSON - Wolfson Microelectronics plc

WM8774IFT Arkusz danych(HTML) 25 Page - Wolfson Microelectronics plc

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WM8774
PP Rev 1.0 June 2002
25
BIT
LABEL
DEFAULT
DESCRIPTION
10011
Timeout Clock Disable
3
TOD
0
DAC Analogue Zero cross detect
timeout disable
0 : Timeout enabled
1: Timeout disabled
DAC ANALOGUE OUTPUT ATTENUATION
Register bits LA and RA control the left and right channel attenuation of DAC. Register bits MASTA
can be used to control attenuation of both channels.
Table 8 shows how the attenuation levels are selected from the 7-bit words.
L/RA[6:0]
ATTENUATION LEVEL
00(hex)
-
∞dB (mute)
:
:
1A(hex)
-
∞dB (mute)
1B(hex)
-100dB
:
:
7D(hex)
-2dB
7E(hex)
-1dB
7F(hex)
0dB
Table 10 Analogue Volume Control Attenuation Levels
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
01001
Digital
Attenuation
DACL
8
UPDATE
Not latched
Controls simultaneous update of all Attenuation Latches
0: Store LDA in intermediate latch (no change to output)
1: Store LDA and update attenuation on all channels
7:0
RDA[6:0]
11111111
(0dB)
Digital Attenuation data for Right channel DACR in 0.5dB steps. See
Table 11
01010
Digital
Attenuation
DACR
8
UPDATE
Not latched
Controls simultaneous update of all Attenuation Latches
0: Store RDA in intermediate latch (no change to output)
1: Store RDA and update attenuation on all channels.
7:0
ASTDA[7:0]
11111111
(0dB)
Digital Attenuation data for both DAC channels in 0.5dB steps. See
Table 11
10001
Master
Digital
Attenuation
(both channels)
8
UPDATE
Not latched
Controls simultaneous update of all Attenuation Latches
0: Store gain in intermediate latch (no change to output)
1: Store gain and update attenuation on all channels.



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