3EQHM57-B-FREQP-D3.75 [EUROQUARTZ]

CMOS Output Clock Oscillator, 13MHz Min, 220MHz Max, ROHS COMPLIANT, MINIATURE, SMD, 4 PIN;


型号：	3EQHM57-B-FREQP-D3.75
厂家：	EUROQUARTZ LIMITED
描述：	CMOS Output Clock Oscillator, 13MHz Min, 220MHz Max, ROHS COMPLIANT, MINIATURE, SMD, 4 PIN
文件：	总2页 (文件大小：267K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

QUARTZ

EURO

3EQHM57 Low EMI Oscillator

7 x 5 x 1.8mm SMD - Group 'P' - Low Jitter

Page 1 of 2

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

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.

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.

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.

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

QUARTZ

EURO

3EQHM57 Low EMI Oscillator

7 x 5 x 1.8mm SMD - Group 'P' - Low Jitter

13.0MHz to 220MHz

Page 2 of 2

OUTLINE & DIMENSIONS

SPECIFICATION

Model No:

3EQHM57 (Group ‘P’)

13.0MHz to 220MHz

See table below

Frequency Range:

Spread Types:

EMI Reduction*:

EMI Reduction (dB) = 10log("Total%"x"SSC Frequency(MHz)"/0.12)

Modulation Carrier Frequency:

25.3kHz min, 58.6kHz max.

Frequency dependent

Call for details

Output Logic:

CMOS

Input Voltage:

Vdd = +3.3VDC ±5%

Frequency Stability***

Commercial (0~70°C): ±25ppm (Spec. code = ‘A’)

±50ppm (Spec. code = ‘B’)

±100ppm (Spec. code = ‘C’)

Industrial (-40~+85°C):

±25ppm (Spec. code = ‘D’)

±50ppm (Spec. code = ‘E’)

±100ppm (Spec. code = ‘F’)

Output Voltage HIGH ‘1’:

2.4V min. at 80% Vdd

Output Voltage LOW ‘0’:

Rise/fall Times:

Load:

0.4V max. at 20% Vdd

1.2ns max, (frequency dependant)

15pF

Start-up Time:

2ms typical, 5ms max.

Current Consumption:

Duty Cycle:

25mA typical, freq. dependant

50%±5% (CL=15pF, 50%Vdd)

±100ps typ. ±150ps max.

40 Ohms typical

>2000V (per MIL STD 833)

-65°C to +150°C

±5ppm /year max at Ta=25°C

EIA 16mm tape and reel, 1k per.

No function available. Do not

electrically connect pad 1.

Cycle to Cycle Jitter:

Output Impedance:

Static Discharge Voltage:

Storage Temperature:

Ageing:

Packaging:

Pad 1 Option:

ENVIRONMENTAL SPECIFICATION

RoHS Compliance:

Storage Temperature Range:

Humidity:

RoHS compliant and Pb (lead) free

-55° to +125°C

85% RH, 85°C for 48 hours

Notes:

EMI reduction is applied to the entire frequency spectrum

dBc: with respect to no modulation. Frequency and total %

spread dependant.

-8

Hermetic Seal:

Solderability:

Reflow:

Leak Rate 2x10 ATM-cm /s max.

MIL-STD-2002F method 208E

260° for 10 seconds

***

Frequency Stability parameter excludes modulation.

Vibration:

MIL-STD-202F method 204,

35g 50Hz to 2000Hz

Shock:

MIL-STD-202F method 213B, test

condition: E, 1000g ½ sine wave

SPREAD TYPES and % MODULATION

DOWN SPREAD CENTRE SPREAD

PART NUMBER CONFIGURATION

D0.5

-0.5%

-0.75%

-1.25%

-2.0%

-2.5%

-3.0%

-3.5%

-3.75%

C0.25

C0.375

C0.625

C1.0

±0.25%

±0.375%

±0.625%

±1.0%

Group ‘P’

Series designation

D0.75

D1.25

D2.0

3EQHM57-B-32.768P-C0.5

D2.5

C1.25

C1.5

±1.25%

±1.5%

Frequency (MHz)

D3.0

Frequency Stability Code

‘A’ to ‘F’. See specification above

D3.5

C1.75

C1.875

±1.75%

±1.875%

D3.75

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

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