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WM8711SEDS/R Scheda tecnica(PDF) 32 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) 32 Page - Wolfson Microelectronics plc

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Production Data
WM8711 / WM8711L
w
PD Rev 4.3 September 2006
32
128/192FS NORMAL MODE
The Normal Mode sample rates are designed for standard 256fs and 384fs MCLK rates. However the
WM8711/L is also capable of being clocked from a 128/192fs MCLK for application over limited
sampling rates as shown in the table below.
SAMPLING RATE
DAC
MCLK
FREQUENCY
SAMPLE
RATE
REGISTER SETTINGS
DIGITAL
FILTER
TYPE
kHz
MHz
BOSR
SR3
SR2
SR1
SR0
6.144
0
0
1
1
1
48
9.216
1
0
1
1
1
2
5.6448
0
1
1
1
1
44.1
8.4672
1
1
1
1
1
2
Table 14 128/192fs Normal Mode Sample Rate Look-up Table
512/768FS NORMAL MODE
512fs and 768fs MCLK rates can be accommodated by using the CLKIDIV2 bit. The core clock to the
DSP will be divided by 2 so an external 512/768 MCLK will become 256/384fs internally and the
device otherwise operates as in Table 10 but with MCLK at twice the specified rate.
USB MODE SAMPLE RATES
In USB mode the MCLK input is 12MHz only.
SAMPLING RATE
DAC
MCLK
FREQUENCY
SAMPLE
RATE
REGISTER SETTINGS
DIGITAL
FILTER
TYPE
kHz
MHz
BOSR
SR3
SR2
SR1
SR0
48
12.000
0
0
0
0
0
0
44.1
(Note 2)
12.000
1
1
0
0
0
1
8
12.000
0
0
0
0
1
0
8
(Note 1)
12.000
1
1
0
0
1
1
32
12.000
0
0
1
1
0
0
96
12.000
0
0
1
1
1
3
88.2
(Note 3)
12.000
1
1
1
1
1
2
Table 15 USB Mode Sample Rate Look-Up Table
Notes:
1.
8k not exact, actual = 8.021kHz
2.
44.1k not exact, actual = 44.118kHz
3.
88.1k not exact, actual = 88.235kHz
4.
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 and the sampling rate will always be a sub-multiple of this. In USB
mode, with BOSR = 0, the base over-sampling rate is defined at 250Fs, with BOSR = 1, the base
over-sampling rate is defined at 272Fs. This can be used to determine the actual audio sampling rate
required by the DAC.



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