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
5 x 3.2 x 1.2mm SMD - Group 'Y'
DESCRIPTION
EQHM53 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.
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
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)
APPLICATIONS
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.
MODULATION TYPES - EXAMPLES
Output amplitude (dB) vs. frequency span (MHz)
Page 1 of 2
3EQHM53 Low EMI Oscillator
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.
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
OUTLINE & DIMENSIONS
3EQHM53-BT-32.768Y-C0.5
Model No: 3EQHM53 (Group ‘Y’)
Frequency Range: 10.0MHz to 160.0MHz
Spread Types: See table below
EMI Reduction*: -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’)
Output Voltage HIGH ‘1’: 2.0V min., 3.2V typ. (90%Vdd)
Output Voltage LOW ‘0’: 0.8V max., 0.2V typ. (10%Vdd)
Rise/fall Times: 4ns max, (frequency dependant)
Load: 15pF
Start-up Time: 2ms typical, 5ms max.
Storage Temperature: -65° to +150°C
Current Consumption:
10 ~ 50MHz: 10mA typical
50 ~ 125MHz: 18mA typical
Duty Cycle: 50%±5% (CL=15pF, 50%Vdd)
Cyle to Cycle Jitter: ±100ps typ. ±150ps max.
Output Impedance: 40 Ohms typical
Static Discharge Voltage: >2000V (per MIL STD 833)
Ageing: ±5ppm /year max at Ta=25°C
Packaging: EIA 16mm tape and reel, 1k per.
Pad 1 Option: Output Enable/Disable. Output is
high impedance when taken low
Output enable time 100ms max.
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.
SPECIFICATION
Page 2 of 2
PART NUMBER CONFIGURATION SPREAD TYPES and % MODULATION
DOWN SPREAD
D1.0 -1%
D3.0 -3%
CENTRE SPREAD
C0.5 ±0.5%
C1.5 ±1.5%
‘T’ for Tristate
Frequency Stability Code
‘A’ to ‘F’. See specification above
Frequency (MHz)
Group ‘Y’
AVAILABILITY OF SPREAD TYPES AND MODULATION RATES
Series designation
ENVIRONMENTAL SPECIFICATION
RoHS Compliance: RoHS compliant and Pb (lead) free
Storage Temperature Range: -55° to +125°C
Humidity: 85% RH, 85°C for 48 hours
Hermetic Seal: Leak Rate 2x10-8 ATM-cm3/s max.
Solderability: MIL-STD-2002F method 208E
Reflow: 260° for 10 seconds
Vibration: MIL-STD-202F method 204,
35g 50Hz to 2000Hz
Shock: MIL-STD-202F method 213B, test
condition: E, 1000g ½ sine wave
5 x 3.2 x 1.2mm SMD - Group 'Y'
3EQHM53 Low EMI Oscillator
10.0MHz to 160MHz
