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WM8734 Datasheet(PDF) 25 Page - List of Unclassifed Manufacturers

Part # WM8734
Description  STEREO AUDIO CODEC
PDF  42 Pages
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Manufacturer  ETC [List of Unclassifed Manufacturers]
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WM8734 Datasheet(HTML) 25 Page - List of Unclassifed Manufacturers

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WM8734
Advanced Information
w
AI Rev 2.2 November 2001
25
SAMPLING
RATE
ADC
DAC
MCLK
FREQUENCY
SAMPLE
RATE
REGISTER SETTINGS
DIGITAL
FILTER
TYPE
KHz
KHz
MHz
BOSR
SR3
SR2
SR1
SR0
12.288
0
0
0
0
0
48
48
18.432
1
0
0
0
0
1
12.288
0
0
0
0
1
48
8
18.432
1
0
0
0
1
1
12.288
0
0
0
1
0
8
48
18.432
1
0
0
1
0
1
12.288
0
0
0
1
1
8
8
18.432
1
0
0
1
1
1
12.288
0
0
1
1
0
32
32
18.432
1
0
1
1
0
1
12.288
0
0
1
1
1
96
96
18.432
1
0
1
1
1
2
11.2896
0
1
0
0
0
44.1
44.1
16.9344
1
1
0
0
0
1
11.2896
0
1
0
0
1
44.1
8
(Note 1)
16.9344
1
1
0
0
1
1
11.2896
0
1
0
1
0
8
(Note 1)
44.1
16.9344
1
1
0
1
0
1
11.2896
0
1
0
1
1
8
(Note 1)
8
(Note 1)
16.9344
1
1
0
1
1
1
11.2896
0
1
1
1
1
88.2
88.2
16.9344
1
1
1
1
1
2
Table 10 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 WM8734 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 produced by the ADC and required by the DAC.
Example scenarios are:
1.
with a requirement that the ADC data rate is 8KHz and DAC data rate is 48KHz, then choosing
MCLK = 12.288MHz the device is programmed with BOSR = 0 (256fs), SR3 = 0, SR2 = 0, SR1
= 1, SR0 = 0.The ADC output data rate will then be exactly 8KHz (derived from 12.288MHz/256
x1/6) and the DAC expects data at exactly 48KHz (derived from 12.288MHz/256)
2.
with a requirement that ADC data rate is 8KHz and DAC data rate is 44.1KHz, then choosing
MCLK = 16.9344MHz the device is programmed with BOSR = 1 (384fs), SR3 = 1, SR2 = 0, SR1
= 0, SR0 = 1. The ADC will no longer output data at exactly 8.000KHz, instead it will be
8.018KHz (derived from 16.9344MHz/384 x 2/11), the DAC still is at exactly 44.1KHz (derived
from 16.9344MHz/384). A slight (sub 0.5%) pitch shift will therefore result in the 8KHz audio
data and (importantly) the user must ensure that the data across the digital interface is correctly
synchronised at the 8.018KHz rate.



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