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WM8281ECS/R Scheda tecnica(PDF) 287 Page - Cirrus Logic

Il numero della parte WM8281ECS/R
Spiegazioni elettronici  Low Power Audio System with Ambient Noise Cancellation and Echo Cancellation
PDF  392 Pages
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Produttore elettronici  CIRRUS [Cirrus Logic]
Homepage  http://www.cirrus.com
Logo CIRRUS - Cirrus Logic

WM8281ECS/R Scheda tecnica(HTML) 287 Page - Cirrus Logic

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WM8281
Rev 4.0
287
SPREAD SPECTRUM FLL CONTROL
The WM8281 can apply modulation to the FLL outputs, using spread spectrum techniques. This can
be used to control the EMI characteristics of the circuits that are clocked via the FLLs.
Each of the FLLs can be individually configured for Triangle modulation, Zero Mean Frequency
Modulation (ZMFM) or Dither. The amplitude and frequency parameters of the spread spectrum
functions is also programmable, using the registers described in Table 109.
REGISTER
ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
R393
(0189h)
FLL1
Spread
Spectrum
5:4
FLL1_SS_AMPL
[1:0]
00
FLL1 Spread Spectrum Amplitude
Controls the extent of the spread-
spectrum modulation.
00 = 0.7% (triangle), 0.7% (ZMFM, dither)
01 = 1.1% (triangle), 1.3% (ZMFM, dither)
10 = 2.3% (triangle), 2.6% (ZMFM, dither)
11 = 4.6% (triangle), 5.2% (ZMFM, dither)
3:2
FLL1_SS_FREQ
[1:0]
00
FLL1 Spread Spectrum Frequency
Controls the spread spectrum modulation
frequency in Triangle mode.
00 = 439kHz
01 = 878kHz
10 = 1.17MHz
11 = 1.76MHz
1:0
FLL1_SS_SEL
[1:0]
00
FLL1 Spread Spectrum Select
00 = Disabled
01 = Zero Mean Frequency (ZMFM)
10 = Triangle
11 = Dither
R425
(01A9h)
FLL2
Spread
Spectrum
5:4
FLL2_SS_AMPL
[1:0]
00
FLL2 Spread Spectrum Amplitude
Controls the extent of the spread-
spectrum modulation.
00 = 0.7% (triangle), 0.7% (ZMFM, dither)
01 = 1.1% (triangle), 1.3% (ZMFM, dither)
10 = 2.3% (triangle), 2.6% (ZMFM, dither)
11 = 4.6% (triangle), 5.2% (ZMFM, dither)
3:2
FLL2_SS_FREQ
[1:0]
00
FLL2 Spread Spectrum Frequency
Controls the spread spectrum modulation
frequency in Triangle mode.
00 = 439kHz
01 = 878kHz
10 = 1.17MHz
11 = 1.76MHz
1:0
FLL2_SS_SEL
[1:0]
00
FLL2 Spread Spectrum Select
00 = Disabled
01 = Zero Mean Frequency (ZMFM)
10 = Triangle
11 = Dither
Table 109 FLL Spread Spectrum Control



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