3EQHM57-ET-14.7456R-C1.5 EUROQUARTZ, 3EQHM57-ET-14.7456R-C1.5 Datasheet

OSC, 5X7MM, SMD, CER, SST, 14.745MHZ

3EQHM57-ET-14.7456R-C1.5

Manufacturer Part Number
3EQHM57-ET-14.7456R-C1.5
Description
OSC, 5X7MM, SMD, CER, SST, 14.745MHZ
Manufacturer
EUROQUARTZ
Series
3EQHM57r

Specifications of 3EQHM57-ET-14.7456R-C1.5

Frequency
14.7456MHz
Frequency Stability
± 50ppm
Supply Voltage
3.3V
Operating Temperature Range
-40°C To +85°C
Load Capacitance
15pF
Resonator Case
SMD
No. Of Pins
4
Svhc
No SVHC
Rohs Compliant
Yes
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
APPLICATIONS
MODULATION TYPES - EXAMPLES
Output amplitude (dB) vs. frequency span (MHz)
Tel: +44 (0)1460 230000 Fax: +44 (0)1460 230001 info@euroquartz.co.uk
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.
Provides up to 15dB reduction in system EMI
‘Drop-in’ replacement for standard clocks
Choice of modulation rate and spread
Miniature package: 7.0 mm x 5.0 mm 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)
EUROQUARTZ LIMITED Blacknell Lane CREWKERNE Somerset UK TA18 7HE
7 x 5 x 1.8mm SMD Spread Spectrum Clock Ocillator
3EQHM57 Group ‘R’
SPREAD SPECTRUM TECHNOLOGY
DESCRIPTION
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.
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.
Low EMI Oscillators
www.euroquartz.co.uk
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Related parts for 3EQHM57-ET-14.7456R-C1.5

3EQHM57-ET-14.7456R-C1.5 Summary of contents

Page 1

... Output amplitude (dB) vs. frequency span (MHz) EUROQUARTZ LIMITED Blacknell Lane CREWKERNE Somerset UK TA18 7HE Tel: +44 (0)1460 230000 Fax: +44 (0)1460 230001 info@euroquartz.co.uk 3EQHM57 Group ‘R’ DESCRIPTION EQHM57 series low EMI oscillators can reduce system EMI by 15dB. The oscillators are a ‘drop-in’ replacement for standard oscillators. ...

Page 2

... SMD Spread Spectrum Clock Ocillator SPECIFICATION Model No: 3EQHM57 (Group ‘R’) Frequency Range: 3.5MHz to 165.0MHz Spread Types: See table below EMI Reduction*: -7dBc min. 100MHz at C0.25** -9dBc min. 100MHz at C0.5** -15dBc min. 100MHz at C1.5** With reference to dB level at no modulation. ...

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