3EQHM42-AT-32.768R-C0.5
更新时间：2024-09-18 08:01:20
品牌：EUROQUARTZ
描述：11.4 x 9.6 x 2.5mm SMD Spread Spectrum Clock Ocillator
概述
规格参数
数据手册3EQHM42-AT-32.768R-C0.5 概述
11.4 x 9.6 x 2.5mm SMD Spread Spectrum Clock Ocillator 11.4 X 9.6 X 2.5毫米SMD扩频时钟Ocillator XO
3EQHM42-AT-32.768R-C0.5 规格参数
| 是否无铅： | 不含铅 | 是否Rohs认证： | 符合 |
| 生命周期： | Contact Manufacturer | Reach Compliance Code： | compliant |
| 风险等级： | 5.71 | Is Samacsys： | N |
| 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： | 25% |
| 安装特点： | SURFACE MOUNT | 标称工作频率： | 32.768 MHz |
| 最高工作温度： | 70 °C | 最低工作温度： | |
| 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 Matches： | 1 |
3EQHM42-AT-32.768R-C0.5 数据手册
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PDF下载Low EMI Oscillators
EQHM42 Group ‘R’
11.4 x 9.6 x 2.5mm 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: 5.0 mm x 3.2 mm x 1.2mm
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
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.
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
Low EMI Oscillators
EQHM42 Group ‘R’
11.4 x 9.6 x 2.5mm SMD Spread Spectrum Clock Ocillator
Page 2 of 2
OUTLINE & DIMENSIONS
SPECIFICATION
Model No:
3EQHM42 (Group ‘R’)
Frequency Range:
Spread Types:
EMI Reduction*:
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.
Modulation Carrier Frequency:
6.9kHz min, 55.5kHz 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’:
2.0V min., 3.2V typ. (90%Vdd)
0.8V max., 0.2V typ. (10%Vdd)
4ns max, (frequency dependant)
15pF
Output Voltage LOW ‘0’:
Rise/fall Times:
Load:
Start-up Time:
2ms typical, 5ms max.
-65° to +150°C
Storage Temperature:
Current Consumption:
10 ~ 50MHz:
10mA typical
50 ~ 125MHz:
Duty Cycle:
Cycle to Cycle Jitter:
Output Impedance:
Static Discharge Voltage:
Ageing:
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.
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
Packaging:
Pad 1 Option:
-8
3
Hermetic Seal:
Solderability:
Reflow:
Leak Rate 2x10 ATM-cm /s max.
MIL-STD-2002F method 208E
260° for 10 seconds
Notes:
Vibration:
MIL-STD-202F method 204,
35g 50Hz to 2000Hz
MIL-STD-202F method 213B, test
condition: E, 1000g ½ sine wave
*
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.
Shock:
PART NUMBER CONFIGURATION
AVAILABILITY OF SPREAD TYPES AND MODULATION RATES
‘T’ Tristate
Series designation
Group ‘R’
SPREAD TYPES and % MODULATION
DOWN SPREAD
D1.0
-1%
-3%
3EQHM42-BT-32.768R-C0.5
D3.0
Frequency (MHz)
CENTRE SPREAD
C0.5
C1.5
±0.5%
±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
3EQHM42-AT-32.768R-C0.5 相关器件
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