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WM8955BLGECO/V датащи(PDF) 35 Page - Wolfson Microelectronics plc

номер детали WM8955BLGECO/V
подробное описание детали  Stereo DAC For Portable Audio Applications
PDF  44 Pages
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производитель  WOLFSON [Wolfson Microelectronics plc]
домашняя страница  http://www.wolfsonmicro.com
Logo WOLFSON - Wolfson Microelectronics plc

WM8955BLGECO/V датащи(HTML) 35 Page - Wolfson Microelectronics plc

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Production Data
WM8955BL
w
PD Rev 4.1 February 2007
35
POWER MANAGEMENT
The WM8955BL has two control registers that allow users to select which functions are active. For
minimum power consumption, unused functions should be disabled. To avoid any pop or click noise,
it is important to enable or disable functions in the correct order (see Applications Information)
REGISTER
ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
8:7
VMIDSEL
00
VMID resistor divider select
00 – VMID disabled
01 – 50k
Ω divider enabled
10 – 500k
Ω divider enabled
11 – 5k
Ω divider enabled (for fast start-up)
R25 (19h)
Power
Manageme
nt (1)
6
VREF
0
VREF (necessary for all other functions)
8
DACL
0
DAC Left Enable
0=off
1=on
7
DACR
0
DAC Right Enable
0=off
1=on
6
LOUT1
0
LOUT1 Output Buffer* Enable
0=off
1=on
5
ROUT1
0
ROUT1 Output Buffer* Enable
0=off
1=on
4
LOUT2
0
LOUT2 Output Buffer* Enable
0=off
1=on
3
ROUT2
0
ROUT2 Output Buffer* Enable
0=off
1=on
2
MOUT
0
MONOOUT Output Buffer and Mono Mixer
Enable
0=off
1=on
R26 (1Ah)
Power
Manageme
nt (2)
1
OUT3
0
OUT3 Output Buffer Enable
0=off
1=on
Note:
* The left mixer is enabled when LOUT1=1 or LOUT2=1. The right mixer is enabled when
ROUT1=1 or ROUT2=1.
Table 26 Power Management



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