Datasheet > 3HM57-BT-160.000R-D1

3HM57-BT-160.000R-D1

更新时间： 2023-01-02 15:39:00

品牌	Logo	应用领域
玛居礼 - MERCURY		/
页数	文件大小	规格书
5页	255K
描述
Oscillator

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数据手册

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3HM57-BT-160.000R-D1 数据手册

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3HM57 Group “R”

A DROP-IN REPLACEMENT SOLUTION FOR YOUR

EMI / EMC COMPLIANCE PROBLEM

The principle sources of the EMI problem

come from the system clocks. Therefore, rather

than patch the problem with ferrite beads, EMI

filters, ground plane and metal shielding, the most

efficient and economic way to reduce the peak

radiation energy is to use the low EMI clock

oscillator.

Compared with the conventional clock

oscillators, Mercury HM57 series spread spectrum

(dithered) clock oscillators can reduce EMI as

much as 12 dB. The beauty is it is a drop-in

replacement for your existing 5x7 clock oscillator.

No need to re-spin the board.

3HM57 reduces your EMI

and shorten your time to market.

Applications

◘ Printers; Multiple function printers (MPCs)

◘ Digital copiers; PDAs

◘ Networking; LAN / WAN; Routers

◘ Storage systems (CD-ROM, VCD, DVD and 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)

Modulation Types Output amplitude (dB) vs frequency span (MHz)

Spread Spectrum Clock (SSC):

Unlike the conventional clock, the

mode energy of a spread spectrum

Down spread “D”. “D1” as an example

Center spread “C”. “C0.5” as an example

clock is spread over a wider

bandwidth, resulting from the

Conventional

Clock

Conventional

Clock

frequency modulation technique. The

modulation carrier frequency is in the

KHz range which makes the

modulation process transparent to the

oscillator frequency. The controlled

modulation process can be on all of

one side of the nominal frequency

(down spread) or 50% up and 50%

down (center spread). The down

spread is preferred if over-clocking is

EMI reduction

Spread

spectrum

clock

Frequency

fo=fc

a problem to the system.

fo - (fo*0.5%)

fo + (fo*0.5%)

fo - (fo*1%)

MERCURY

www.mercury-crystal.com

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

Page 1 of 5

April. 19. 2005 Rev. G

12 3 4 5

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