3EQHM57-B-32.768P datasheet, PDF

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3EQHM57-B-32.768P: Description7 x 5 x 1.8mm SMD Spread Spectrum Ocillator, Low Jitter; File Size326KB，2 Pages; ManufacturerEuroquartz; Websitehttp://www.euroquartz.co.uk/

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3EQHM57-B-32.768P Overview

7 x 5 x 1.8mm SMD Spread Spectrum Ocillator, Low Jitter

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3EQHM57 Group ‘P’ Low EMI Oscillators

7 x 5 x 1.8mm SMD Spread Spectrum Ocillator, Low Jitter

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

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.

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.

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.

APPLICATIONS

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)

MODULATION TYPES - EXAMPLES

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

www.euroquartz.co.uk

3EQHM57-B-32.768P Related Products

	3EQHM57-B-32.768P	3EQHM57-A-32.768P-D0.5	3EQHM57-B-32.768P-D0.5	3EQHM57-C-32.768P-D0.5
Description	7 x 5 x 1.8mm SMD Spread Spectrum Ocillator, Low Jitter	7 x 5 x 1.8mm SMD Spread Spectrum Ocillator, Low Jitter	7 x 5 x 1.8mm SMD Spread Spectrum Ocillator, Low Jitter	7 x 5 x 1.8mm SMD Spread Spectrum Ocillator, Low Jitter
Is it lead-free?	-	Lead free	Lead free	Lead free
Is it Rohs certified?	-	conform to	conform to	conform to
Reach Compliance Code	-	compli	compli	compli
Other features	-	TAPE AND REEL	TAPE AND REEL	TAPE AND REEL
maximum descent time	-	1.2 ns	1.2 ns	1.2 ns
Frequency Adjustment - Mechanical	-	NO	NO	NO
frequency stability	-	25%	50%	100%
Installation features	-	SURFACE MOUNT	SURFACE MOUNT	SURFACE MOUNT
Nominal operating frequency	-	32.768 MHz	32.768 MHz	32.768 MHz
Maximum operating temperature	-	70 °C	70 °C	70 °C
Oscillator type	-	CMOS	CMOS	CMOS
Output load	-	15 pF	15 pF	15 pF
physical size	-	7.0mm x 5.0mm x 1.8mm	7.0mm x 5.0mm x 1.8mm	7.0mm x 5.0mm x 1.8mm
longest rise time	-	1.2 ns	1.2 ns	1.2 ns
Maximum supply voltage	-	3.465 V	3.465 V	3.465 V
Minimum supply voltage	-	3.135 V	3.135 V	3.135 V
Nominal supply voltage	-	3.3 V	3.3 V	3.3 V
surface mount	-	YES	YES	YES
maximum symmetry	-	55/45 %	55/45 %	55/45 %
Base Number Matches	-	1	1	1

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