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WM8711SEDS/R Scheda tecnica(PDF) 31 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) 31 Page - Wolfson Microelectronics plc

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Production Data
WM8711 / WM8711L
w
PD Rev 4.3 September 2006
31
The table below should be used to set up the device to work with the various sample rate
combinations. Refer to Digital Filter Characteristics section for an explanation of the different filter
types.
SAMPLING RATE
DAC
MCLK
FREQUENCY
SAMPLE
RATE
REGISTER SETTINGS
DIGITAL
FILTER
TYPE
kHz
MHz
BOSR
SR3
SR2
SR1
SR0
12.288
0 (256fs)
0
0
0
0
48
18.432
1 (384fs)
0
0
0
0
1
12.288
0 (256fs)
0
0
0
1
8
18.432
1 (384fs)
0
0
0
1
1
12.288
0 (256fs)
0
1
1
0
32
18.432
1 (384fs)
0
1
1
0
1
12.288
0 (128fs)
0
1
1
1
96
18.432
1 (192fs)
0
1
1
1
2
11.2896
0 (256fs)
1
0
0
0
44.1
16.9344
1 (384fs)
1
0
0
0
1
11.2896
0 (256fs)
1
0
0
1
8
(Note 1)
16.9344
1 (384fs)
1
0
0
1
1
11.2896
0 (128fs)
1
1
1
1
88.2
16.9344
1 (192fs)
1
1
1
1
2
Table 12 Normal Mode Sample Rate Look-up Table
Notes:
1.
8k not exact, actual = 8.018kHz
2.
All other combinations of BOSR and SR[3:0] that are not in the truth table are invalid
The BOSR bit represents the base over-sampling rate. This is the rate that the WM8711/L digital
signal processing is carried out at. In Normal mode, with BOSR = 0, the base over-sampling rate is at
256fs, with BOSR = 1, the base over-sampling rate is at 384fs. This can be used to determine the
actual audio data rate required by the DAC.
The exact sample rates achieved are defined by the relationships in Table 13 below.
ACTUAL SAMPLING RATE
BOSR=0
BOSR=1
TARGET
SAMPLING
RATE
MCLK=12.288
MCLK=11.2896
MCLK=18.432
MCLK=16.9344
kHz
kHz
kHz
kHz
kHz
8
8.018
8
8.018
8
(12.288MHz/256) x 1/6
(11.2896MHz/256) x 2/11
(18.432MHz/384) x 1/6
(16.9344MHz/384) x 2/11
32
32
32
(12.288MHz/256) x 2/3
not available
(18.432MHz/384) x 2/3
not available
44.1
44.1
44.1
not available
11.2896MHz/256
not available
16.9344MHz /384
48
48
48
12.288MHz/256
not available
18.432MHz/384
not available
88.2
88.2
88.2
not available
(11.2896MHz/256) x 2
not available
(16.9344MHz /384) x 2
96
96
96
(12.288MHz/256) x 2
not available
(18.432MHz/384) x 2
not available
Table 13 Normal Mode Actual Sample Rates



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