P2180AF-08SR;中文规格书,Datasheet资料

Peak Reducing EMI Solution

Features

FCC approved method of EMI attenuation. Provides up to 15dB EMI reduction.

Generates a 1X low EMI spread spectrum clock from the input frequency.

Optimized for frequency range:

o P2180: 20MHz to 40MHz

Internal loop filter minimizes external components and board space.

Selectable spread options: Down Spread. Low inherent cycle-to-cycle jitter. 3.3V operating voltage.

CMOS/TTL compatible inputs and outputs. Low-power CMOS design.

Supports notebook VGA and other LCD timing controller applications.

Drop-in replacement to Cypress W180/1. Available in 8-pin SOIC package.

Product Description

The P2180 is a versatile spread spectrum frequency modulator designed specifically for a range of clock frequencies from 20MHz to 40MHz.The P2180 can generate an EMI reduced clock form an OSC or a system generated clock. The P2180 offers various combinations

©2010 SCILLC. All rights reserved. of percentage deviations. Refer Spread Deviation Selections Table.

The P2180 reduces electromagnetic interference (EMI) at the clock source, allowing system wide reduction of EMI of down stream clock and data dependent signals. The P2180 allows significant system cost savings by reducing the number of circuit board layers and shielding that are traditionally required to pass EMI regulations.

The P2180 modulates the output of a single 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.

The P2180 uses the most efficient and optimized modulation profile approved by the FCC and is implemented by using a proprietary all-digital method.

Applications

The P2180 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 systems.

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