SI2704-A10 SILABS [Silicon Laboratories], SI2704-A10 Datasheet - Page 18

• Manufacturer Part Number: SI2704-A10
• Description: EMI MITIGATING 2.1X 5 W CLASS D AUDIO AMPLIFIER
• Manufacturer: SILABS [Silicon Laboratories]

Si2704/05/06/07-A10
Figure 11. PWM CM Spectrum for Integer Mode PWM
Figure 12. PWM CM Spectrum for Fractional Mode PWM
4.1.2.3. Spectral Spreading
Spread mode PWM can be used to spread PWM common mode switching energy resulting in a peak energy
suppression greater than 20 dB at all frequencies. This Spectral Shaping feature is useful for mitigating EMI
radiation and eliminating inductors for filter-less applications. Spread Mode PWM can be programmed dynamically
by setting property PWM_CONFIG during normal operation without adversely affecting the internal audio
processing or the differential output signal integrity.
4.1.2.4. Spectral Shaping Noise-Free Notch for AM Radio (Si2705/07 only)
When using Spread Mode PWM with full rate PWM switching (960 kHz), a tunable noise-free notch can be
programmed via 2-Wire control to shape the switching noise and create a narrow frequency band in the AM radio
spectrum in which the PWM common mode switching energy is not allowed to spread. This noise-free notch is
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