P2180 PULSECORE [PulseCore Semiconductor], P2180 Datasheet

P2180

Manufacturer Part Number

P2180

Description

Peak Reducing EMI Solution

Manufacturer

PULSECORE [PulseCore Semiconductor]

Datasheet

1.P2180.pdf (9 pages)

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November 2006

rev 1.1

Features

Product Description

The P2180/81X is a versatile spread spectrum

frequency modulator designed specifically for a

wide range of clock frequencies from 20MHz to

40MHz and 60MHz to 160MHz (Refer Input

Frequency and Modulation Rate Table.) The

P2180/81X can generate an EMI reduced clock

form an OSC or a system generated clock. The

P2180/81A

combinations of spread options and percentage

deviations. (Refer Spread Deviation Selections

Table.) These combinations include Down and

Center Spread and percentage deviation range

from ± 0.625% to –3.50%.

The

interference (EMI) at the clock source, allowing

system wide reduction of EMI of down stream clock

and data dependent signals. The P2180/81X allows

significant system cost savings by reducing the

number of circuit board layers and shielding that

are traditionally required to pass EMI regulations.

•

1715 S. Bascom Ave Suite 200, Campbell, CA 95008 • Tel: 408-879-9077 • Fax: 408-879-9018

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:

Internal

components and board space.

Selectable spread options: Down Spread and

Center Spread.

Low inherent cycle-to-cycle jitter.

P2180/81X

•

P2180 / 84: 20MHz to 40MHz

P2181: 60MHz to 160MHz

P2182 / 83: 10MHz to 20MHz

loop

P2180/81D

reduces

filter

Notice: The information in this document is subject to change without notice.

minimizes

PulseCore Semiconductor Corporation

electromagnetic

offer

Peak Reducing EMI Solution

www.pulsecoresemi.com

external

various

The P2180/81X 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 P2180/81X uses the most efficient and

optimized modulation profile approved by the FCC

and is implemented by using a proprietary all-digital

method.

Applications

The

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.

•

P2180/81X

Eight spread % selections:

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.

Products are available for industrial temperature

range.

Available in 8-pin SOIC and TSSOP packages.

•

P2180 / 81 / 82 / 83 / 84

± 0.625% to -3.5%.

targeted

towards

EMI

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