WM8711BL
Production Data
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
0
SR2
0
SR1
0
SR0
0
48
12.288
18.432
12.288
18.432
12.288
18.432
12.288
18.432
11.2896
16.9344
11.2896
16.9344
11.2896
16.9344
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)
1
1
1
2
1
1
2
0
0
0
0
8
32
0
0
0
1
0
0
0
1
0
1
1
0
0
1
1
0
96
0
1
1
1
0
1
1
1
44.1
1
0
0
0
1
0
0
0
8
1
0
0
1
(Note 1)
88.2
1
0
0
1
1
1
1
1
1
1
1
1
Table 11 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 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.
TARGET
ACTUAL SAMPLING RATE
SAMPLING
RATE
BOSR=0
MCLK=11.2896
kHz
BOSR=1
MCLK=16.9344
MCLK=12.288
MCLK=18.432
kHz
kHz
kHz
8
kHz
8.018
8
8.018
8
(12.288MHz/256) x 1/6
32
(11.2896MHz/256) x 2/11
not available
(18.432MHz/384) x 1/6
32
(16.9344MHz/384) x 2/11
not available
32
(12.288MHz/256) x 2/3
not available
(18.432MHz/384) x 2/3
not available
44.1
48
44.1
44.1
11.2896MHz/256
not available
16.9344MHz /384
not available
48
48
12.288MHz/256
not available
18.432MHz/384
not available
88.2
96
88.2
88.2
(11.2896MHz/256) x 2
not available
(16.9344MHz /384) x 2
not available
96
96
(12.288MHz/256) x 2
(18.432MHz/384) x 2
Table 12 Normal Mode Actual Sample Rates
PD, Rev 4.2, December 2011
2844
w
WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
