May 2005 com ASM3P2111B Peak EMI Reducing Solution rev 0.
1 Features ƒ ƒ ƒ Generates an EMI optimized clock at the output.
Input frequency: 25 MHz.
Frequency outputs: o o o ƒ ƒ ƒ ƒ ƒ 60 MHz (unmodulated) 2 x 48 MHz (unmodulated) 66.
6 MHz (modulated): -1.
7% down spread allows significant system cost savings by reducing the number of circuit board layers and shielding that are required to pass EMI regulations.
The ASM3P2111B modulates the output of PLL in order to spread the bandwidth of a synthesized clock, thereby decreasing the peak amplitudes of its harmonics.
This results in significantly lower system EMI compared to the typical narrow band signal produced by oscillator...

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