ASM3P2853A

 Generates an EMI optimized clock signal at output.
 Input frequency: 25 MHz.
 Frequency outputs:
    o USB Clock (48 MHz unmodulated)
    o 50 MHz (modulated), ±1% centre spread
 Modulation rate: 39 KHz.
 Spread Spectrum ON/OFF control
Supply voltage range 2.5V ± 5%.
 Available in 8-pin SOIC package.
 Commercial Temperature range.

ASM3P2853A is targeted towards EMI management for high speed digital applications such as PC peripheral devices, consumer electronics and embedded controller systems.

The ASM3P2853A is a versatile spread spectrum frequency modulator. The ASM3P2853A reduces electromagnetic interference (EMI) at the clock source. The ASM3P2853A allows significant system cost savings by reducing the number of circuit board layers andshielding that are required to pass EMI regulations. The ASM3P2853A 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 oscillators and most clock generators. Lowering EMI by increasing a signal's bandwidth is called spread spectrum clock generation.