WM8711BL Wolfson Microelectronics, WM8711BL Datasheet - Page 28

• Manufacturer Part Number: WM8711BL
• Description: Ultra-Small Audio DAC
• Manufacturer: Wolfson Microelectronics

WM8711BL
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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.
Table 11 Normal Mode Sample Rate Look-up Table
Notes:
1.
2.
The BOSR bit represents the base over-sampling rate. This is the rate that the WM8711BL 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 12 below.
Table 12 Normal Mode Actual Sample Rates
SAMPLING RATE
8
32
44.1
48
88.2
96
SAMPLING
TARGET
RATE
8k not exact, actual = 8.018kHz
All other combinations of BOSR and SR[3:0] that are not in the truth table are invalid
(Note 1)
kHz
DAC
44.1
88.2
kHz
48
32
96
8
8
(12.288MHz/256) x 1/6
(12.288MHz/256) x 2/3
(12.288MHz/256) x 2
MCLK=12.288
not available
not available
12.288MHz/256
FREQUENCY
11.2896
16.9344
11.2896
16.9344
11.2896
16.9344
kHz
12.288
18.432
12.288
18.432
12.288
18.432
12.288
18.432
32
48
96
MCLK
8
MHz
BOSR=0
0 (256fs)
1 (384fs)
0 (256fs)
1 (384fs)
0 (256fs)
1 (384fs)
0 (128fs)
1 (192fs)
0 (256fs)
1 (384fs)
0 (256fs)
1 (384fs)
0 (128fs)
1 (192fs)
BOSR
(11.2896MHz/256) x 2/11
(11.2896MHz/256) x 2
MCLK=11.2896
not available
11.2896MHz/256
not available
not available
8.018
44.1
88.2
ACTUAL SAMPLING RATE
kHz
SR3
REGISTER SETTINGS
0
0
0
0
0
0
0
0
1
1
1
1
1
1
SAMPLE
RATE
SR2
0
0
0
0
1
1
1
1
0
0
0
0
1
1
(18.432MHz/384) x 1/6
(18.432MHz/384) x 2/3
(18.432MHz/384) x 2
MCLK=18.432
not available
not available
18.432MHz/384
SR1
kHz
32
48
96
0
0
0
0
1
1
1
1
0
0
0
0
1
1
8
PD, Rev 4.1, April 2007
SR0
BOSR=1
0
0
1
1
0
0
1
1
0
0
1
1
1
1
Production Data
(16.9344MHz/384) x 2/11
(16.9344MHz /384) x 2
MCLK=16.9344
16.9344MHz /384
not available
not available
not available
DIGITAL
FILTER
TYPE
8.018
44.1
88.2
kHz
1
1
1
2
1
1
2
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