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WM8711SEDS/R Scheda tecnica(PDF) 33 Page - Wolfson Microelectronics plc

Il numero della parte WM8711SEDS/R
Spiegazioni elettronici  Internet Audio DAC with Integrated Headphone Amplifier
PDF  47 Pages
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Produttore elettronici  WOLFSON [Wolfson Microelectronics plc]
Homepage  http://www.wolfsonmicro.com
Logo WOLFSON - Wolfson Microelectronics plc

WM8711SEDS/R Scheda tecnica(HTML) 33 Page - Wolfson Microelectronics plc

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Production Data
WM8711 / WM8711L
w
PD Rev 4.4 April 2007
33
The exact sample rates supported for all combinations are defined by the relationships in Table 16
below.
ACTUAL SAMPLING RATE
TARGET
SAMPLING
RATE
BOSR=0
( 250FS)
BOSR=1
(272FS)
kHz
kHz
kHz
8
8.021
8
12MHz/(250 x 48/8)
12MHz/(272 x 11/2)
32
32
12MHz/(250 x 48/32)
not available
44.117
44.1
not available
12MHz/272
48
48
12MHz/250
not available
88.235
88.2
not available
12MHz/136
96
96
12MHz/125
not available
Table 16 USB Mode Actual Sample Rates
ACTIVATING DSP AND DIGITAL AUDIO INTERFACE
To prevent any communication problems from arising across the Digital Audio Interface is disabled
(tristate with weak 100k pulldown) at power on. Once the Audio Interface and the Sampling Control
has been programmed it is activated by setting the ACTIVE bit under Software Control.
REGISTER
ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
0001001
Active Control
0
ACTIVE
0
Activate Interface
1 = Active
0 = Inactive
Table 17 Activating DSP and Digital Audio Interface
It is recommended that between changing any content of Digital Audio Interface or Sampling Control
Register that the active bit is reset then set.
SOFTWARE CONTROL INTERFACE
The software control interface may be operated using either a 3-wire or 2-wire MPU interface.
Selection of interface format is achieved by setting the state of the MODE pin.
In 3-wire mode, SDIN is used for the program data, SCLK is used to clock in the program data and
CSB is used to latch in the program data. In 2-wire mode, SDIN is used for serial data and SCLK is
used for the serial clock. In 2-wire mode, the state of CSB pin allows the user to select one of two
addresses.
SELECTION OF SERIAL CONTROL MODE
The serial control interface may be selected to operate in either 2 or 3-wire modes. This is achieved
by setting the state of the MODE pin.
MODE
INTERFACE
FORMAT
0
2 wire
1
3 wire
Table 18 Control Interface Mode Selection



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