WM8976 Wolfson Microelectronics Ltd., WM8976 Datasheet - Page 70

• Manufacturer Part Number: WM8976
• Description: The WM8976 is a low power, high quality stereo codec designed for portable applications such as Digital still camera or Digital Camcorde
• Manufacturer: Wolfson Microelectronics Ltd.

WM8976
Table 58 PLL Frequency Examples
COMPANDING
w
MCLK
(MHz)
19.68
19.68
14.4
14.4
19.2
19.2
19.8
19.8
(F1)
12
12
13
13
24
24
26
26
27
27
DESIRED
OUTPUT
12.288
12.288
12.288
12.288
12.288
12.288
12.288
12.288
12.288
(MHz)
11.29
11.29
11.29
11.29
11.29
11.29
11.29
11.29
11.29
The PLL performs best when f
are shown in Table 58.
LOOPBACK
Setting the LOOPBACK register bit enables digital loopback. When this bit is set the output data
from the ADC audio interface is fed directly into the DAC data input.
The WM8976 supports A-law and -law and companding and linear mode on both transmit (ADC)
and receive (DAC) sides. Companding can be enabled on the DAC or ADC audio interfaces by
writing the appropriate value to the DAC_COMP or ADC_COMP register bits respectively.
90.3168
90.3168
90.3168
90.3168
90.3168
90.3168
90.3168
90.3168
90.3168
98.304
98.304
98.304
98.304
98.304
98.304
98.304
98.304
98.304
(MHz)
F2
PRESCALE
DIVIDE
1
1
1
1
1
1
2
2
2
2
2
2
2
2
2
2
2
2
2
is around 90MHz. Its stability peaks at N=8. Some example settings
POSTSCALE
DIVIDE
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
6.947446
7.561846
6.826667
9.178537
9.990243
9.122909
9.929697
6.947446
7.561846
6.690133
7.281778
7.5264
7.5264
8.192
6.272
9.408
10.24
8.192
R
(Hex)
A
7
8
6
7
6
6
9
9
9
9
9
7
8
6
7
6
7
N
PP Rev 3.0 April 2006
Pre-Production
BOAC93
F28BD4
45A1CA
D3A06E
EE009E
F28BD4
86C226
8FD525
6872AF
3D70A3
2DB492
FD809F
86C226
8FD525
3126E8
1F76F7
3126E8
482296
(Hex)
K
70