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參數(shù)資料
| 型號： | 3EQHM57-A-220.000P-C1.0 |
| 廠商： | EUROQUARTZ LTD |
| 元件分類： | XO, clock |
| 英文描述： | CRYSTAL OSCILLATOR, CLOCK, 220 MHz, CMOS OUTPUT |
| 封裝： | ROHS COMPLIANT, MINIATURE, SMD, 4 PIN |
| 文件頁數(shù)： | 1/2頁 |
| 文件大?。?/td> | 267K |
| 代理商： | 3EQHM57-A-220.000P-C1.0 |
EUROQUARTZ LIMITED Blacknell Lane CREWKERNE Somerset UK TA18 7HE
Tel: +44 (0)1460 230000 Fax: +44 (0)1460 230001
info@euroquartz.co.uk
www.euroquartz.co.uk
EURO QUARTZ
7 x 5 x 1.8mm SMD - Group 'P' - Low Jitter
3EQHM57 Low EMI Oscillator
DESCRIPTION
EQHM57 series low EMI oscillators can reduce system EMI by 15dB.
The oscillators are a ‘drop-in’ replacement for standard oscillators.
EMI reduction is achieved by the use of Spread Spectrum Technology
whereby the mode energy is spread over a wider bandwidth. The
modulation carrier frequency, operating in the kHz region, makes the
process transparent to the oscillator frequency. There is a choice of
modulation rates and spread to suit application requirements.
Provides up to 15dB reduction in system EMI
‘Drop-in’ replacement for standard clocks
Choice of modulation rate and spread
Miniature package: 7.0mm x 5.0mm x 1.8mm
Printers, Multiple Function Printers (MPCs)
Digital Copiers; PDAs
Networking: LAN/WAN; Routers
Storage Systems (CD-ROM, VCD, DVD, HDD)
Scanners; Modems; Projectors
Embedded Systems
Musical Instruments
Automotive: GPS car navigation systems
LCD PC Monitors; LSD TVs
ADSL; PCMCIA
Still Digital Cameras (SDCs)
APPLICATIONS
SPREAD SPECTRUM TECHNOLOGY
Unlike a conventional clock oscillator, in a Spread Spectrum Clock
Oscillator the mode energy is spread over a wider bandwidth. This is
achieved by the frequency modulation technique. The controlled
modulation process may be applied to the 'down' side of the nominal
frequency (known as DOWN SPREAD,) or spread equally either side
of nominal (CENTRE SPREAD). Down Spread is preferred if over-
clocking would cause a problem to the system.
MODULATION TYPES - EXAMPLES
Output amplitude (dB) vs. frequency span (MHz)
Page 1 of 2
In electrical systems the principal cause of electro-
magnetic interference (EMI) is the system clock
oscillator. Traditional methods of 'patching-up' systems
with too high a level of EMI is to use ferrite beads,
filters, ground planes, metal shielding and similar costly
methods, However, the most efficient and economic
method to reduce EMI is to reduce it at source: replace
the system clock ocillator with a low EMI clock oscillator.
Compared with conventional clock oscillators, Spread
Spectrum (Dithered) Oscillators can reduce EMI by as
much as 15dB. The part is a 'drop-in' replacement for a
standard clock oscillator hence there is no requirement
to re-design existing PCBs.
相關(guān)PDF資料 |
PDF描述 |
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| 3EQHM57-A-220.000P-C1.5 | CRYSTAL OSCILLATOR, CLOCK, 220 MHz, CMOS OUTPUT |
| 3EQHM57-A-220.000P-D2.0 | CRYSTAL OSCILLATOR, CLOCK, 220 MHz, CMOS OUTPUT |
| 3EQHM57-A-220.000P-D3.75 | CRYSTAL OSCILLATOR, CLOCK, 220 MHz, CMOS OUTPUT |
| 3EQHM8-BT-32.768R-D1.0 | CRYSTAL OSCILLATOR, CLOCK, 32.768 MHz, CMOS OUTPUT |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 3EQHM57-A-32.768P-C0.25 | 制造商:EUROQUARTZ 制造商全稱:EUROQUARTZ limited 功能描述:7 x 5 x 1.8mm SMD Spread Spectrum Ocillator, Low Jitter |
| 3EQHM57-A-32.768P-C0.375 | 制造商:EUROQUARTZ 制造商全稱:EUROQUARTZ limited 功能描述:7 x 5 x 1.8mm SMD Spread Spectrum Ocillator, Low Jitter |
| 3EQHM57-A-32.768P-C0.625 | 制造商:EUROQUARTZ 制造商全稱:EUROQUARTZ limited 功能描述:7 x 5 x 1.8mm SMD Spread Spectrum Ocillator, Low Jitter |
| 3EQHM57-A-32.768P-C1.0 | 制造商:EUROQUARTZ 制造商全稱:EUROQUARTZ limited 功能描述:7 x 5 x 1.8mm SMD Spread Spectrum Ocillator, Low Jitter |
| 3EQHM57-A-32.768P-C1.25 | 制造商:EUROQUARTZ 制造商全稱:EUROQUARTZ limited 功能描述:7 x 5 x 1.8mm SMD Spread Spectrum Ocillator, Low Jitter |
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