Data Sheet

EURO QUARTZ
3EQHM572N Low EMI Oscillator
7 x 5 x 1.4mm SMD - Group 'N'
Provides from 8dB to 15dB reduction in system EMI
‘Drop-in’ replacement for standard clocks
Choice of modulation rate and spread
Miniature package: 7.0 mm x 5.0 mm x 1.4mm
N Group parts provide a low cost EMI reduction solution
In electrical systems the principal cause of electromagnetic 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 16dB. The part is a 'drop-in' replacement for a
standard clock oscillator hence there is no requirement
to re-design existing PCBs.
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)
Medical devices
Page 1 of 3
DESCRIPTION
EQHM572 series low EMI oscillators can reduce system EMI from 8dB
to 16dB. 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 overclocking would cause a problem to the system.
MODULATION TYPES - EXAMPLES
EUROQUARTZ LIMITED Blacknell Lane CREWKERNE Somerset UK TA18 7HE
Tel: +44 (0)1460 230000 Fax: +44 (0)1460 230001 [email protected] www.euroquartz.co.uk
EURO QUARTZ
3EQHM572N Low EMI Oscillator
7 x 5 x 1.4mm SMD - Group 'N'
8.0MHz to 128MHz
Page 2 of 3
SPECIFICATION
Model No:
Frequency Range:
Spread Types:
Spread Magnitude:
3EQHM572 (Group ‘N’)
8.0MHz to 128.0MHz
Down or Centre spread
See table 1 below.
(
)
8~15dB reduction typical.
Fundamental and higher order
harmonics.
EMI Reduction:
Variation of EMI reduction
across Temerature:
Modulation Carrier Frequency:
Frequency Stability***
Commercial (0~70°C):
OUTLINE & DIMENSIONS
5% max. across -40° to +85°C
w.r.t. room temperature
31.25kHz min, 62.50kHz max.
±25ppm (Spec. code = ‘A’)
±50ppm (Spec. code = ‘B’)
±100ppm (Spec. code = ‘C’)
Industrial (-40~+85°C):
Rise/Fall Times:
Start-up Time:
Stabilisation (PLL Lock) Time:
Ageing:
Output Logic:
Input Voltage:
Output Voltage HIGH ‘1’:
Output Voltage LOW ‘0’:
Load:
Current Consumption (no load)
12MHz:
24MHz:
32MHz:
Duty Cycle:
Cycle to Cycle Jitter:
Output Impedance:
Packaging:
Pad 1 Function:
±25ppm (Spec. code = ‘D’)
±50ppm (Spec. code = ‘E’)
±100ppm (Spec. code = ‘F’)
5ns max, (10% to 90% Vdd)
5ms typical, 10ms max.
2ms maximum.
±5ppm/year
CMOS Square Wave
+3.3Volts DC±10%
2.4V min., IOH = -4mA at
Spread Spectrum output
0.4V max., IOH = 4mA at
Spread Spectrum output
15pF maximum
28mA
33mA
41mA
50%±10% (CL=15pF, 50%Vdd)
See table 2
45 to 90Ω typical. Dependent
upon output frequency spread
type and spread magnitude
EIA 16mm tape and reel, 1k per.
No connection
SSC BLOCK DIAGRAM
CYCLE-TO-CYCLE JITTER Table 2
8.0MHz:
16.0MHz:
32.0MHz:
64.0MHz:
128.0MHz:
240ps
270ps
240ps
165ps
150ps
typical,
typical,
typical,
typical,
typical,
450ps
400ps
380ps
380ps
380ps
maximum
maximum
maximum
maximum
maximum
EUROQUARTZ LIMITED Blacknell Lane CREWKERNE Somerset UK TA18 7HE
Tel: +44 (0)1460 230000 Fax: +44 (0)1460 230001 [email protected] www.euroquartz.co.uk
EURO QUARTZ
3EQHM572N Low EMI Oscillator
7 x 5 x 1.4mm SMD - Group 'N'
8.0MHz to 128MHz
Page 3 of 3
SPREAD TYPE & MODULATION MAGNITUDE Table 1
Frequency Range
(MHz)
Modulation Carrier
Frequency (kHz)
fo
Spread Type and Modulation Magnitude (%)
(Spread Spectrum Part Code)
Centre Spread ('C')
Down Spread ('D')
8.0 ~ 9.99
±1.4% (C1.4)
±0.6% (C0.6)
'-3.0% (D3)
-2.2% (D2.2)
10.0 ~ 11.99
±1.3% (C1.3)
±0.5% (C0.5)
-2.7% (D2.7)
-1.9% (D1.9)
12.0 ~ 13.99
fo/256
±1.2% (C1.2)
±0.5% (C0.5)
-2.5% (D2.5)
-1.8% (D1.8)
14.0 ~ 15.99
±1.1% (C1.1)
±0.4% (C0.4)
-2.3% (D2.3)
-1.7% (D1.7)
16.0 ~ 19.99
±1.4% (C1.4)
±0.6% (C0.6)
'-3.0% (D3)
-2.2% (D2.2)
20.0 ~ 23.99
±1.3% (C1.3)
±0.5% (C0.5)
-2.7% (D2.7)
-1.9% (D1.9)
24.0 ~ 27.99
fo/512
±1.2% (C1.2)
±0.5% (C0.5)
-2.5% (D2.5)
-1.8% (D1.8)
28.0 ~ 31.99
±1.1% (C1.1)
±0.4% (C0.4)
-2.3% (D2.3)
-1.7% (D1.7)
32.0 ~ 39.99
±1.4% (C1.4)
±0.6% (C0.6)
'-3.0% (D3)
-2.2% (D2.2)
40.0 ~ 47.99
±1.3% (C1.3)
±0.5% (C0.5)
-2.7% (D2.7)
-1.9% (D1.9)
48.0 ~ 55.99
fo/256
±1.2% (C1.2)
±0.5% (C0.5)
-2.5% (D2.5)
-1.8% (D1.8)
56.0 ~ 63.99
±1.1% (C1.1)
±0.4% (C0.4)
-2.3% (D2.3)
-1.7% (D1.7)
64.0 ~ 79.99
±1.4% (C1.4)
±0.6% (C0.6)
'-3.0% (D3)
-2.2% (D2.2)
80.0 ~ 95.99
±1.3% (C1.3)
±0.5% (C0.5)
-2.7% (D2.7)
-1.9% (D1.9)
±1.2% (C1.2)
±0.5% (C0.5)
-2.5% (D2.5)
-1.8% (D1.8)
±1.1% (C1.1)
±0.4% (C0.4)
-2.3% (D2.3)
-1.7% (D1.7)
96.0 ~111.99
fo/512
112.0 ~ 128.0
ENVIRONMENTAL SPECIFICATION
RoHS Compliance:
Moisture Sensitivity Level:
Second Level Interconnect:
Humidity:
Fine Leak / Gross Leak:
Solderability:
Reflow:
Vibration:
Shock:
Resistance to Solvents:
Temperature Cycling:
ESD Rating:
Pad Surface Finish:
Device Mass (Weight):
RoHS compliant and Pb (lead) free in accordance with EU Directive 2002/95/EC
6/6 (2002/95/EC) and WEEE (2002/96/EC)
Level 1 (infinite) according to IPC/JEDEC J-STD-020D.1
e4
85% RH, 85°C for 48 hours
MIL-STD-883, method 1014, condition A / MIL-STD-883, method 1014, condition C
MIL-STD-2002F method 208E
260° for 10 seconds 2 times
MIL-STD-202F method 204, 35G 50 to 2000Hz
MIL-STD-202F method 213B, test condition: E, 1000g ½ sine wave
MIL_STD-202, method 215
MIL-STD-883, method 1010
2kV minimum per JEDEC STD 22-A114-B
Gold (Au) (0.3µm minimum) over Nickel (N) (1.27µm to 8.89µm)
0.14mg per unit typical
PART NUMBER FORMAT AND EXAMPLE
Group ‘N’
Series designation
3EQHM572-B-32.768N-C1.4
Frequency (MHz)
Spread type and modulation magnitude.
Use the spread spectrum characteristic
part code shown in Table 1 above.
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 [email protected] www.euroquartz.co.uk
Similar pages