ASM3P1819N

The ASM3P1819N is targeted towards EMI management for memory and LVDS interfaces in mobile graphic chipsets and high-speed digital applications such as PC peripheral devices, consumer electronics and embedded controller system.

The ASM3P1819N is a versatile spread spectrum frequency modulator designed specifically for a wide range of input clock frequencies from 20 to 40MHz. The ASM3P1819N can generate an EMI reduced clock from crystal, ceramic resonator, or system clock.The ASM3P1819N reduces electromagnetic interference (EMI) at the clock source, allowing a system wide EMI reduction for all the down stream clocks and data dependent signals.

The ASM3P1819N allows significant system cost savings by reducing the number of circuit board layers, ferrite beads, shielding, and other passive components that are traditionally required to pass EMI regulations.

The ASM3P1819N modulates the output of a single PLL in order to "spread" the bandwidth of a synthesized clock, thereby decreasing the peak amplitude of its harmonics. This result 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".

The ASM3P1819N uses the most efficient and optimized modulation profile approved by the FCC and is implemented by using a proprietary all digital method