AN-2068 DS90UR241/124 Spread Spectrum Tolerance Support (Rev. B)
Compliance to EMI limits is often a challenge. Spread spectrum clocking is commonly used to minimize EMI. The effect of modulating periodic signals, both clock and data, reduces the peak emissions by spreading the energy over a range of frequencies. The DS90UR241 and DS90UR124 chipset allows the use of spread spectrum clock and data inputs. The following is a discussion of spread spectrum clock characteristics and the interaction with DS90UR241/124 chipset.