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3EQHM42-FT-FREQR-C0.5

器件型号:3EQHM42-FT-FREQR-C0.5
器件类别:无源元件    振荡器   
文件大小:228KB,共2页
厂商名称:Euroquartz
厂商官网:http://www.euroquartz.co.uk/
标准:
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器件描述

CMOS Output Clock Oscillator, 3.5MHz Min, 165MHz Max, ROHS COMPLIANT, MINIATURE, HERMETIC, SMD, 4 PIN

参数
参数名称属性值
是否无铅不含铅
是否Rohs认证符合
Reach Compliance Codecompliant
其他特性TRI-STATE; ENABLE/DISABLE FUNCTION; TAPE AND REEL
最长下降时间4 ns
频率调整-机械NO
频率稳定性100%
安装特点SURFACE MOUNT
最大工作频率165 MHz
最小工作频率3.5 MHz
最高工作温度85 °C
最低工作温度-40 °C
振荡器类型CMOS
输出负载15 pF
物理尺寸11.4mm x 9.6mm x 2.5mm
最长上升时间4 ns
最大供电电压3.465 V
最小供电电压3.135 V
标称供电电压3.3 V
表面贴装YES
最大对称度55/45 %
Base Number Matches1

文档预览

EURO
QUARTZ
Provides up to 15dB reduction in system EMI
‘Drop-in’ replacement for standard clocks
Choice of modulation rate and spread
Miniature package: 5.0 mm x 3.2 mm x 1.2mm
EQHM42 Low EMI Oscillator
Page 1 of 2
11.4 x 9.6 x 2.5mm SMD - Group 'R'
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
EQHM42 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
EURO
QUARTZ
EQHM42 Low EMI Oscillator
3.5MHz to 165MHz
Page 2 of 2
11.4 x 9.6 x 2.5mm SMD - Group 'R'
SPECIFICATION
Model No:
Frequency Range:
Spread Types:
EMI Reduction*:
3EQHM42 (Group ‘R’)
3.5MHz to 165.0MHz
See table below
-7dBc min. 100MHz at C0.25**
-9dBc min. 100MHz at C0.5**
-15dBc min. 100MHz at C1.5**
With reference to dB level at no
modulation.
6.9kHz min, 55.5kHz max.
Frequency dependent
Call for details
CMOS
Vdd = +3.3VDC ±5%
±25ppm (Spec. code = ‘A’)
±50ppm (Spec. code = ‘B’)
±100ppm (Spec. code = ‘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
2ms typical, 5ms max.
-65° to +150°C
10mA typical
18mA typical
50%±5% (CL=15pF, 50%Vdd)
±250ps typ. ±300ps 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.
OUTLINE & DIMENSIONS
Modulation Carrier Frequency:
Output Logic:
Input Voltage:
Frequency Stability***
Commercial (0~70°C):
Industrial (-40~+85°C):
Output Voltage HIGH ‘1’:
Output Voltage LOW ‘0’:
Rise/fall Times:
Load:
Start-up Time:
Storage Temperature:
Current Consumption:
10 ~ 50MHz:
50 ~ 125MHz:
Duty Cycle:
Cycle to Cycle Jitter:
Output Impedance:
Static Discharge Voltage:
Ageing:
Packaging:
Pad 1 Option:
ENVIRONMENTAL SPECIFICATION
RoHS Compliance:
Storage Temperature Range:
Humidity:
Hermetic Seal:
Solderability:
Reflow:
Vibration:
Shock:
RoHS compliant and Pb (lead) free
-55° to +125°C
85% RH, 85°C for 48 hours
Leak Rate 2x10
-8
ATM-cm
3
/s max.
MIL-STD-2002F method 208E
260° for 10 seconds
MIL-STD-202F method 204,
35g 50Hz to 2000Hz
MIL-STD-202F method 213B, test
condition: E, 1000g ½ sine wave
Notes:
*
EMI reduction is applied to the entire frequency spectrum
** dBc: with respect to no modulation. Frequency and total %
spread dependant.
*** Frequency Stability parameter excludes modulation.
PART NUMBER CONFIGURATION
Series designation
‘T’ Tristate
Group ‘R’
AVAILABILITY OF SPREAD TYPES AND MODULATION RATES
SPREAD TYPES and % MODULATION
DOWN SPREAD
3EQHM42-BT-32.768R-C0.5
Frequency (MHz)
Frequency Stability Code
‘A’ to ‘F’. See specification above
D1.0
D3.0
CENTRE SPREAD
C0.5
C1.5
-1%
-3%
±0.5%
±1.5%
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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