18EQHM32-FT-42.000F-C0.25 [EUROQUARTZ]
CMOS Output Clock Oscillator, 42MHz Nom, ROHS COMPLIANT, MINIATURE, SMD, 4 PIN;型号: | 18EQHM32-FT-42.000F-C0.25 |
厂家: | EUROQUARTZ LIMITED |
描述: | CMOS Output Clock Oscillator, 42MHz Nom, ROHS COMPLIANT, MINIATURE, SMD, 4 PIN |
文件: | 总2页 (文件大小:234K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
QUARTZ
18EQHM32 Low EMI Oscillator
EURO
3.2 x 2.5 x 1.0mm 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: 2.5 mm x 3.2 mm x 1.0 mm
OUTLINE & DIMENSIONS
SPECIFICATION
Model No:
18EQHM32
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)
e4
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
3
Hermetic Seal:
Solderability:
Reflow:
Leak Rate 2x10 ATM-cm /s max.
MIL-STD-2002F method 208E
260° for 10 seconds x2
0.5%
1%
-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)
2%
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)
DD
Vss-0.5V min., V +0.5V max.
Weight of the Device:
0.04 grams.
DD
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
18EQHM32 Low EMI Oscillator
EURO
3.2 x 2.5 x 1.0mm 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
18EQHM32-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
18EQHM32 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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