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WM8972LEFL/R 数据表(PDF) 33 Page - Wolfson Microelectronics plc

部件名 WM8972LEFL/R
功能描述  MONO CODEC FOR PORTABLE AUDIO APPLICATIONS
PDF  49 Pages
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制造商  WOLFSON [Wolfson Microelectronics plc]
网页  http://www.wolfsonmicro.com
标志 WOLFSON - Wolfson Microelectronics plc

WM8972LEFL/R 数据表(HTML) 33 Page - Wolfson Microelectronics plc

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Preliminary Technical Data
WM8972L
w
PTD Rev 2.2 June 2004
33
The clocking of the WM8972L is controlled using the CLKDIV2, USB, and SR control bits. Setting the
CLKDIV2 bit divides MCLK by two internally. The USB bit selects between ‘Normal’ and USB mode.
Each value of SR[4:0] selects one combination of MCLK division ratios and hence one combination
of sample rates (see next page). Since all sample rates are generated by dividing MCLK, their
accuracy depends on the accuracy of MCLK. If MCLK changes, the sample rates change
proportionately.
Note that some sample rates (e.g. 44.1kHz in USB mode) are approximated, i.e. they differ from their
target value by a very small amount. This is not audible, as the maximum deviation is only 0.27%
(8.0214kHz instead of 8kHz in USB mode). By comparison, a half-tone step corresponds to a 5.9%
change in pitch.
MCLK
CLKDIV2=0
MCLK
CLKDIV2=1
ADC SAMPLE RATE
(ADCLRC)
DAC SAMPLE RATE
(DACLRC)
USB
SR [4:0]
FILTER
TYPE
BCLK
(MS=1)
‘Normal’ Clock Mode (‘*’ indicates backward compatibility with WM8731)
8 kHz (MCLK/1536)
8 kHz (MCLK/1536)
0
00110 *
1
MCLK/4
8 kHz (MCLK/1536)
48 kHz (MCLK/256)
0
00100 *
1
MCLK/4
12 kHz (MCLK/1024)
12 kHz (MCLK/1024)
0
01000
1
MCLK/4
16 kHz (MCLK/768)
16 kHz (MCLK/768)
0
01010
1
MCLK/4
24 kHz (MCLK/512)
24 kHz (MCLK/512)
0
11100
1
MCLK/4
32 kHz (MCLK/384)
32 kHz (MCLK/384)
0
01100 *
1
MCLK/4
48 kHz (MCLK/256)
8 kHz (MCLK/1536)
0
00010 *
1
MCLK/4
48 kHz (MCLK/256)
48 kHz (MCLK/256)
0
00000 *
1
MCLK/4
12.288 MHz
24.576 MHz
96 kHz (MCLK/128)
96 kHz (MCLK/128)
0
01110 *
3
MCLK/2
8.0182 kHz (MCLK/1408)
8.0182 kHz (MCLK/1408)
0
10110 *
1
MCLK/4
8.0182 kHz (MCLK/1408)
44.1 kHz (MCLK/256)
0
10100 *
1
MCLK/4
11.025 kHz (MCLK/1024)
11.025 kHz (MCLK/1024)
0
11000
1
MCLK/4
22.05 kHz (MCLK/512)
22.05 kHz (MCLK/512)
0
11010
1
MCLK/4
44.1 kHz (MCLK/256)
8.0182 kHz (MCLK/1408)
0
10010 *
1
MCLK/4
44.1 kHz (MCLK/256)
44.1 kHz (MCLK/256)
0
10000 *
1
MCLK/4
11.2896MHz 22.5792MHz
88.2 kHz (MCLK/128)
88.2 kHz (MCLK/128)
0
11110 *
3
MCLK/2
8 kHz (MCLK/2304)
8 kHz (MCLK/2304)
0
00111 *
1
MCLK/6
8 kHz (MCLK/2304)
48 kHz (MCLK/384)
0
00101 *
1
MCLK/6
12 kHz (MCLK/1536)
12 kHz (MCLK/1536)
0
01001
1
MCLK/6
16kHz (MCLK/1152)
16 kHz (MCLK/1152)
0
01011
1
MCLK/6
24kHz (MCLK/768)
24 kHz (MCLK/768)
0
11101
1
MCLK/6
32 kHz (MCLK/576)
32 kHz (MCLK/576)
0
01101 *
1
MCLK/6
48 kHz (MCLK/384)
48 kHz (MCLK/384)
0
00001 *
1
MCLK/6
48 kHz (MCLK/384)
8 kHz (MCLK/2304)
0
00011 *
1
MCLK/6
18.432MHz
36.864MHz
96 kHz (MCLK/192)
96 kHz (MCLK/192)
0
01111 *
3
MCLK/3
8.0182 kHz (MCLK/2112)
8.0182 kHz (MCLK/2112)
0
10111 *
1
MCLK/6
8.0182 kHz (MCLK/2112)
44.1 kHz (MCLK/384)
0
10101 *
1
MCLK/6
11.025 kHz (MCLK/1536)
11.025 kHz (MCLK/1536)
0
11001
1
MCLK/6
22.05 kHz (MCLK/768)
22.05 kHz (MCLK/768)
0
11011
1
MCLK/6
44.1 kHz (MCLK/384)
8.0182 kHz (MCLK/2112)
0
10011 *
1
MCLK/6
44.1 kHz (MCLK/384)
44.1 kHz (MCLK/384)
0
10001 *
1
MCLK/6
16.9344MHz 33.8688MHz
88.2 kHz (MCLK/192)
88.2 kHz (MCLK/192)
0
11111 *
3
MCLK/3
USB Mode (‘*’ indicates backward compatibility with WM8731)
8 kHz (MCLK/1500)
8 kHz (MCLK/1500)
1
00110 *
0
MCLK
8 kHz (MCLK/1500)
48 kHz (MCLK/250)
1
00100 *
0
MCLK
8.0214 kHz (MCLK/1496)
8.0214kHz (MCLK/1496)
1
10111 *
1
MCLK
8.0214 kHz (MCLK/1496)
44.118 kHz (MCLK/272)
1
10101 *
1
MCLK
11.0259 kHz (MCLK/1088)
11.0259kHz (MCLK/1088)
1
11001
1
MCLK
12 kHz (MCLK/1000)
12 kHz (MCLK/1000)
1
01000
0
MCLK
16kHz (MCLK/750)
16kHz (MCLK/750)
1
01010
0
MCLK
22.0588kHz (MCLK/544)
22.0588kHz (MCLK/544)
1
11011
1
MCLK
24kHz (MCLK/500)
24kHz (MCLK/500)
1
11100
0
MCLK
32 kHz (MCLK/375)
32 kHz (MCLK/375)
1
01100 *
0
MCLK
44.118 kHz (MCLK/272)
8.0214kHz (MCLK/1496)
1
10011 *
1
MCLK
44.118 kHz (MCLK/272)
44.118 kHz (MCLK/272)
1
10001 *
1
MCLK
48 kHz (MCLK/250)
8 kHz (MCLK/1500)
1
00010 *
0
MCLK
48 kHz (MCLK/250)
48 kHz (MCLK/250)
1
00000 *
0
MCLK
88.235kHz (MCLK/136)
88.235kHz (MCLK/136)
1
11111 *
3
MCLK
12.000MHz
24.000MHz
96 kHz (MCLK/125)
96 kHz (MCLK/125)
1
01110 *
2
MCLK
Table 29 Master Clock and Sample Rates



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