18EQHM53-ET-12.500F-D0.5 [EUROQUARTZ]

CMOS Output Clock Oscillator, 12.5MHz Nom, ROHS COMPLIANT, MINIATURE, SMD, 4 PIN;


型号：	18EQHM53-ET-12.500F-D0.5
厂家：	EUROQUARTZ LIMITED
描述：	CMOS Output Clock Oscillator, 12.5MHz Nom, ROHS COMPLIANT, MINIATURE, SMD, 4 PIN 机械振荡器
文件：	总2页 (文件大小：240K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

QUARTZ

18EQHM53 Low EMI Oscillator

EURO

5 x 3.2 x 1.2mm SMD - Group 'F' (1.8 Volts)

FEATURES

Page 1 of 2

Provides up to -12dB reduction in system EMI

‘Drop-in’ replacement for standard clocks

No need to re-design printed circuit boards

Operates with 1.8 Volts supply voltage

Choice of modulation rate and spread

Miniature package: 3.2 mm x 5.0 mm x 1.2mm

OUTLINE & DIMENSIONS

SPECIFICATION

Model No:

18EQHM53

Frequency Range:

12.5MHz to 42.0MHz

EMI Reduction and Spread Types:

Modulation Carrier Frequency:

Output Logic:

CMOS

Input Voltage:

Vdd = +1.8 ±0.15VDC

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’:

1.6V min., 1.85V max.

0.0V max., 0.2V max.

2.5ns max.

Output Voltage LOW ‘0’:

Rise/Fall Times:

Load:

15pF

Start-up Time:

2ms typical, 5ms max.

40ms max.

30W typical

Stabilization Time:

Output Impedance:

Output Slew Rate:

0.4 V/ns min.; 3.0V/ns max.

Current Consumption:

13MHz:

2.0mA typical

16MHz:

2.8mA typical

25MHz:

3.5mA typical

42MHz:

5.0mA typical

Duty Cycle:

Cyle to Cycle Jitter:

Ageing:

50%±10% (CL=15pF, 50%Vdd)

±100ps max.

±5ppm /year max at Ta=25°C

Output Enable/Disable. Output is

high impedance when taken low

Output enable time 100ms max.

EIA 16mm tape and reel, 1k per.

Pad 1 Option:

ENVIRONMENTAL SPECIFICATION

RoHS Compliance:

RoHS compliant and Pb (lead) free

Level 1 (Infinite)

Packaging:

Moisture Sensitivity Level:

Second Level Interconnect:

Storage Temperature Range:

Humidity:

-55° to +125°C

SPREAD TYPE & PERCENTAGE AND EMI REDUCTION RATES

85% RH, 85°C for 48 hours

MIL-STD-883, meth. 1014, cond. A

MIL-STD-883, meth. 1014, cond. C

Fine Leak / Gross Leak:

EMI

Reduction

Rate

Total %

Down

Spread (D)

Centre

Spread (C)

-8

Hermetic Seal:

Solderability:

Reflow:

Leak Rate 2x10 ATM-cm /s max.

MIL-STD-2002F method 208E

260° for 10 seconds x2

0.5%

-0.5% (D0.5) ±0.25% (C0.25)

-12dB (typ.)

-16dB (typ.)

-18dB (typ.)

Vibration:

MIL-STD-202F method 204, 35g,

50Hz to 2000Hz

-1% (D1)

-2% (D2)

±0.5% (C0.5)

±1% (C1.0)

Shock:

MIL-STD-202F method 213B, test

condition: E, 1000g ½ sine wave

MIL-STD-202, Method 215

MIL-STD-883, Method 1010

>2000V (per MIL-STD-883,

method 3015)

Resistance to Solvents:

Temperature Cycling:

ESD Rating:

ABSOLUTE MAXIMUM RATINGS

Power Supply Voltage

Input Voltage

-0.5V min., +2.5V max.

Pad Surface Finish:

Gold (0.3um min.) over nickel

(1.27um to 8.89um)

Vss-0.5V min., V +0.5V max.

Weight of the Device:

0.09 grams.

Output Voltage

Vss-0.5V min., V +0.5V max.

Operation Junction Temp.

Output Current

-40°C min., +125°C max.

-13mA min., +13mA max.

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

18EQHM53 Low EMI Oscillator

EURO

3.2 x 5 x 1.2mm SMD - Group 'F' (1.8 Volts)

Page 2 of 2

PART NUMBER CONFIGURATION

‘T’ for Tristate

SPREAD TYPE & PERCENTAGE

Group ‘F’ Characteristics

Series designation

"D0.5"

"D1"

-0.5%

-1%

Down Spread

Centre Spread

18EQHM53-BT-20.000F-C0.5

"D2"

-2%

"C0.25"

"C0.5"

"C1.0

±0.25%

±0.5%

±0.1%

Frequency (MHz)

Frequency Stability Code

‘A’ to ‘F’. See specification

MODULATION TYPES - EXAMPLES

DESCRIPTION

SPREAD SPECTRUM TECHNOLOGY

18EQHM53 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.

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.

INTRODUCTION

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 standard clock oscillators hence there is

no requirement to re-design existing PCBs.

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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