3EQHM57-ET-32.768Y-D2.0 [EUROQUARTZ]

7 x 5 x 1.8mm SMD Spread Spectrum Clock Ocillator; 7 ×5× 1.8毫米SMD扩频时钟Ocillator


型号：	3EQHM57-ET-32.768Y-D2.0
厂家：	EUROQUARTZ LIMITED
描述：	7 x 5 x 1.8mm SMD Spread Spectrum Clock Ocillator 7 ×5× 1.8毫米SMD扩频时钟Ocillator 时钟
文件：	总2页 (文件大小：358K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

3EQHM57 Group ‘Y’ Low EMI Oscillators

7 x 5 x 1.8mm SMD Spread Spectrum Clock Ocillator

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: 7.0 mm x 5.0 mm 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

3EQHM57 Group 'Y' Low EMI Oscillators

7 x 5 x 1.8mm SMD Spread Spectrum Clock Ocillator

Page 2 of 2

SPECIFICATION

Model No:

3EQHM57 (Group ‘Y’)

8.0MHz to 165.0MHz

Frequency Range:

Spread Types:

EMI Reduction*:

See table below

OUTLINE & DIMENSIONS

-9dBc min. 100MHz at C0.5**

-12Bc min. 100MHz at C1.0**

-15dBc min. 100MHz at C1.5**

With reference to dB level at no

modulation.

Modulation Carrier Frequency:

12kHz min, 42kHz 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’)

2.0V min., 3.2V typ. (90%Vdd)

0.8V max., 0.2V typ. (10%Vdd)

4ns max, (frequency dependant)

15pF

Output Voltage HIGH ‘1’:

Output Voltage LOW ‘0’:

Rise/fall Times:

Load:

Start-up Time:

2ms typical, 5ms max.

Storage Temperature:

Current Consumption:

10 ~ 50MHz:

-65° to +150°C

10mA typical

50 ~ 125MHz:

18mA typical

Duty Cycle:

50%±5% (CL=15pF, 50%Vdd)

±100ps typ. ±150ps max.

40 Ohms typical

>2000V (per MIL STD 833)

±5ppm /year max at Ta=25°C

EIA 16mm tape and reel, 1k per.

Output Enable/Disable. Output is

high impedance when taken low

Output enable time 100ms max.

Cyle to Cycle Jitter:

Output Impedance:

Static Discharge Voltage:

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

-8

Hermetic Seal:

Solderability:

Reflow:

Leak Rate 2x10 ATM-cm /s max.

MIL-STD-2002F method 208E

260° for 10 seconds

Notes:

EMI reduction is applied to the entire frequency spectrum

Vibration:

MIL-STD-202F method 204,

35g 50Hz to 2000Hz

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

spread dependant.

Shock:

MIL-STD-202F method 213B, test

condition: E, 1000g ½ sine wave

*** Frequency Stability parameter excludes modulation.

AVAILABILITY OF SPREAD TYPES AND MODULATION RATES

SPREAD TYPES and % MODULATION

DOWN SPREAD

PART NUMBER CONFIGURATION

‘T’ for Tristate

Group ‘Y’

D1.0

-1%

-2%

-3%

Series designation

D2.0

D3.0

3EQHM57-BT-32.768Y-C0.5

CENTRE SPREAD

Frequency (MHz)

C0.5

C1.0

C1.5

±0.5%

±1.0%

±1.5%

Frequency Stability Code

‘A’ to ‘F’. See specification above

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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