Production Data
WM8978
w
PD, Rev 4.5, October 2011
77
MCLK
(MHZ)
(F1)
DESIRED
OUTPUT
(MHZ)
F2
(MHZ)
PRESCALE
DIVIDE
POSTSCALE
DIVIDE
R N
(HEX)
K
(HEX)
12 11.29
90.3168
1
2 7.5264 7
86C226
12 12.288
98.304 1
2 8.192 8 3126E8
13 11.29
90.3168
1
2 6.947446
6
F28BD4
13 12.288
98.304 1
2 7.561846
7 8FD525
14.4 11.29
90.3168 1
2 6.272 6 45A1CA
14.4 12.288
98.304 1
2 6.826667 6 D3A06E
19.2 11.29
90.3168 2
2 9.408 9 6872AF
19.2 12.288
98.304 2
2 10.24 A 3D70A3
19.68 11.29
90.3168 2
2 9.178537 9 2DB492
19.68 12.288
98.304 2
2 9.990243 9 FD809F
19.8 11.29
90.3168 2
2 9.122909
9 1F76F7
19.8 12.288
98.304 2
2 9.929697 9 EE009E
24 11.29
90.3168
2
2 7.5264 7
86C226
24 12.288
98.304 2
2 8.192 8 3126E8
26 11.29
90.3168
2
2 6.947446
6
F28BD4
26 12.288
98.304 2
2 7.561846
7 8FD525
27 11.29
90.3168
2
2 6.690133
6
BOAC93
27 12.288
98.304 2
2 7.281778
7 482296
Table 58 PLL Frequency Examples
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.
COMPANDING
The WM8978 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.
Summary of Contents for WM8978
Page 11: ...Production Data WM8978 w PD Rev 4 5 October 2011 11 SPEAKER OUTPUT THD VERSUS POWER...
Page 14: ...WM8978 Production Data w PD Rev 4 5 October 2011 14 AUDIO PATHS OVERVIEW...
Page 55: ...Production Data WM8978 w PD Rev 4 5 October 2011 55 Figure 26 Left Right Output Channel Mixers...
Page 60: ...WM8978 Production Data w PD Rev 4 5 October 2011 60 Figure 29 Speaker Outputs LOUT2 and ROUT2...