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ASM3P2508A-08-ST

更新时间： 2024-11-10 22:06:51

品牌	Logo	应用领域
ALSC		晶体外围集成电路光电二极管时钟
页数	文件大小	规格书
11页	3688K
描述
Peak EMI Reducing Solution

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数据手册

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ASM3P2508A-08-ST 数据手册

February 2005

rev 1.3

ASM3P2508A

Peak EMI Reducing Solution

Features

The ASM3P2508A allows significant system cost savings

by reducing the number of circuit board layers and

shielding that are required to pass EMI regulations. The

ASM3P2508A 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.

ꢀ

Generates an EMI optimized clocking signal at

output.

ꢀ

Input frequency – 14.31818 MHz.

Frequency outputs:

120 MHz (modulated) - default.

72 MHz (modulated) or 48 MHz

(modulated) selectable via I2C

ꢀ

± 1% Centre spread.

Modulation rate: 40 KHz.

Byte Write via I2C

The ASM3P2508A has a feature to power down the

72MHz/48MHz output by writing data into specific

registers in the device via I2C. By writing a ‘0’ into bit 1 of

Byte 0, the PLL block generating 72 MHz / 48MHz can be

powered down. Writing ‘0’ into bit ‘7’ of Byte 1 selects an

output of 72 MHz on FOUT2CLK while a ‘1’ at the same

location selects a 48 MHz clock output. However, the I2C

block, crystal oscillator, and the PLL block generating

120MHz would be always running.

Supply voltage range 3.3V ± 0.3V.

Available in 8-pin SOIC Package.

Available in Commercial and Industrial

Temperature ranges.

Product Description

The ASM3P2508A is

a versatile spread spectrum

frequency modulator. The ASM3P2508A reduces

electromagnetic interference (EMI) at the clock source.

Block Diagram

V_DD

XIN

Crystal

Oscillator

PLL 1

XOUT

FOUT1CLK

(120 MHz)

SCL

I2C

Interface

PLL 2

FOUT2CLK

(72 MHz / 48 MHz)

SDA

V_SS

Alliance Semiconductor

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

12 3 4 5 6 7...11

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