3HM572-ET-160.000R-C1.5 datasheet, PDF

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3HM572-ET-160.000R-C1.5: DescriptionOscillator; CategoryPassive components oscillator; File Size618KB，5 Pages; ManufacturerMercury; Websitehttp://www.mercuryunited.com

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3HM572-ET-160.000R-C1.5 Overview

Oscillator

3HM572-ET-160.000R-C1.5 Parametric

Parameter Name	Attribute value
Maker	Mercury
Reach Compliance Code	compliant
Base Number Matches	1

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EMI Reduction Spread Spectrum Clock Oscillators

3HM572 Series Group “R”

The most efficient way to reduce EMI (Electromagnetic Interference) is to reduce it from its

principle source – the clock oscillator. Mercury 3HM572, an integrated clock module

composed of a spread spectrum clock and a quartz crystal, reduces EMI by 9 dB or more

while providing the clock speed needed for the system. It is a drop-in replacement for

standard 5x7 mm non-SSC clocks, no need to change the board or the solder pad layout.

The 3HM572 series (1.4 mm height) replaces the 3HM57 series (1.8 mm height). They are

identical products, with the only difference being the package heights. The 3HM57 is obsolete.

Please refer to Mercury

PCN-111004 “Change HM57 to HM572” .

MERCURY

Since 1973

Applications:

◘

Printers; Multiple function printers (MPCs)

◘

Digital copiers; PDAs

◘

Networking; LAN / WAN; Routers

◘

Storage systems

(CD-ROM,

VCD, DVD & HDD)

◘

Scanner; Modems; Projectors

◘

Hand-held ID Readers

◘

Embedded systems; Electrical Musical Instrument

◘

Automotive; GPS Car Navigation Systems

◘

LCD PC Monitors / LCD TVs

◘

ADSL; PCMCIA

◘

Still Digital Cameras (SDCs)

◘

Medical Devices

Spread Spectrum Clock (SSC):

Unlike the conventional clock, the mode

energy of a spread spectrum clock is

spread (distributed) over a wider

bandwidth between two pre-defined

frequency boundaries by the

frequency

modulation

technique. The modulation

carrier frequency is in the KHz range

which makes the modulation process

transparent to the oscillator frequency.

This controlled modulation process can

be on all of one side of the nominal

frequency (down

spread),

which is

preferred if system over-clocking is a

concern, or 50% up and 50% down

(center

spread).

Modulation Types

DOWN or CENTER spread

Down spread “D”.

“D1” as an example

Center spread “C”.

“C0.5” as an example

Output amplitude (dB) vs frequency span (MHz)

EMI reduction

Conventional

Clock

EMI reduction

Conventional

Clock

Spread

spectrum

clock

fo - (fo*1%)

Frequency

fo - (fo*0.5%)

fo=fc

fo + (fo*0.5%)

32.768 MHz non-SSC vs SSC at Center Spread 1.5%:

No modulation

-9.9 dB

Center spread

1.5% (C1.5)

-23.0 dB

13.1 dB

reduction

Taiwan: TEL (886)-2-2406-2779, FAX (886)-2-2496-0769, e-mail:

sales-tw@mercury-crystal.com

U.S.A.: TEL (1)-909-466-0427, FAX (1)-909-466-0762, e-mail:

sales-us@mercury-crystal.com

MERCURY

Page 1 of 5

Oct. 18, 2011 Rev. 0

MERCURY

www.mercury-crystal.com

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