ASM3I2111AF-08SR ALSC [Alliance Semiconductor Corporation], ASM3I2111AF-08SR Datasheet

ASM3I2111AF-08SR

Manufacturer Part Number

ASM3I2111AF-08SR

Description

Peak EMI Reducing Solution

Manufacturer

ALSC [Alliance Semiconductor Corporation]

Datasheet

1.ASM3I2111AF-08SR.pdf (8 pages)

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rev 1.3

Features

Product Description

The ASM3P2111A is a versatile spread spectrum

frequency

electromagnetic interference (EMI) at the clock source.

Block Diagram

March 2005

XIN /CLKIN

2575 Augustine Drive • Santa Clara CA • Tel: 408-855-4900 • Fax: 408-855-4999 • www.alsc.com

Generates an EMI optimized clocking signal at

output.

Input frequency – 25 MHz.

Frequency outputs:

Modulation rate: 30 KHz.

Supply voltage range: 3.3V ± 0.3V.

Available in 8-pin SOIC Package.

Commercial and Industrial Temperature range.

XOUT

modulator.

60 MHz (unmodulated)

2 x 48 MHz (unmodulated)

66.6 MHz (modulated) -1.7% down spread

The

Oscillator

48 MHz_1

ASM3P2111A

Crystal

Peak EMI Reducing Solution

Alliance Semiconductor

reduces

The ASM3P2111A allows significant system cost savings

by reducing the number of circuit board layers and

shielding that are required to pass EMI regulations. The

ASM3P2111A 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.

Applications

ASM3P2111A is targeted towards EMI management for

high speed digital applications such as PC peripheral

devices, consumer electronics and embedded controller

systems.

PLL1

PLL2

ASM3P2111A

66.6 MHz

Modulated

48 MHz_2

60 MHz

48 MHz_1

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