1.8mm Spread Spectrum Ocillator, Jitter Provides 15dB reduction s
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3EQHM57 Group Oscillators
1.8mm Spread Spectrum Ocillator, Jitter
Provides 15dB reduction system `Drop-in' replacement standard clocks Choice modulation rate spread Miniature package: 7.0mm 5.0mm 1.8mm
electrical systems principal cause electromagnetic interference (EMI) system clock oscillator. Traditional methods 'patching-up' systems with high level ferrite beads, filters, ground planes, metal shielding similar costly methods, However, most efficient economic method reduce reduce source: replace system clock ocillator with clock oscillator. Compared with conventional clock oscillators, Spread Spectrum (Dithered) Oscillators reduce much 15dB. part 'drop-in' replacement standard clock oscillator hence there requirement re-design existing PCBs.
DESCRIPTION EQHM57 series oscillators reduce system 15dB. oscillators `drop-in' replacement standard oscillators. reduction achieved Spread Spectrum Technology whereby mode energy spread over wider bandwidth. modulation carrier frequency, operating region, makes process transparent oscillator frequency. There choice modulation rates spread suit application requirements.
SPREAD SPECTRUM TECHNOLOGY Unlike conventional clock oscillator, Spread Spectrum Clock Oscillator mode energy spread over wider bandwidth. This achieved frequency modulation technique. controlled modulation process applied 'down' side nominal frequency (known DOWN SPREAD,) spread equally either side nominal (CENTRE SPREAD). Down Spread preferred overclocking would cause problem 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: navigation systems Monitors; ADSL; PCMCIA Still Digital Cameras (SDCs)
MODULATION TYPES EXAMPLES Output amplitude (dB) frequency span (MHz)
EUROQUARTZ LIMITED Blacknell Lane CREWKERNE Somerset TA18 Tel: (0)1460 230000 Fax: (0)1460 230001 info@euroquartz.co.uk www.euroquartz.co.uk
3EQHM57 Group Oscillators
1.8mm Spread Spectrum Ocillator, Jitter
Page
SPECIFICATION Model 3EQHM57 (Group `P') Frequency Range: 13.0MHz 220MHz Spread Types: table below Reduction*: Reduction (dB) 10log("Total%"x"SSC Frequency(MHz)"/0.12) Modulation Carrier Frequency: 25.3kHz min, 58.6kHz max. Frequency dependent Call details Output Logic: CMOS Input Voltage: +3.3VDC 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': 2.4V min. Output Voltage `0': 0.4V max. Rise/fall Times: 1.2ns max, (frequency dependant) Load: 15pF Start-up Time: typical, max. Current Consumption: 25mA typical, freq. dependant Duty Cycle: 50%±5% (CL=15pF, 50%Vdd) Cycle Cycle Jitter: ±100ps typ. ±150ps max. Output Impedance: Ohms typical Static Discharge Voltage: >2000V (per 833) Storage Temperature: -65°C +150°C Ageing: ±5ppm /year Ta=25°C Packaging: 16mm tape reel, per. Option: function available. electrically connect Notes: reduction applied entire frequency spectrum dBc: with respect modulation. Frequency total spread dependant. Frequency Stability parameter excludes modulation. OUTLINE DIMENSIONS
ENVIRONMENTAL SPECIFICATION RoHS Compliance: Storage Temperature Range: Humidity: Hermetic Seal: Solderability: Reflow: Vibration: Shock: RoHS compliant (lead) free -55° +125°C 85°C hours Leak Rate 2x10-8 ATM-cm3/s max. MIL-STD-2002F method 208E 260° seconds MIL-STD-202F method 204, 50Hz 2000Hz MIL-STD-202F method 213B, test condition: 1000g sine wave
SPREAD TYPES MODULATION PART NUMBER CONFIGURATION DOWN SPREAD Series designation Group D0.5 D0.75 -0.5% -0.75% -1.25% -2.0% -2.5% -3.0% -3.5% -3.75% CENTRE SPREAD C0.25 C0.375 C0.625 C1.0 C1.25 C1.5 C1.75 C1.875 ±0.25% ±0.375% ±0.625% ±1.0% ±1.25% ±1.5% ±1.75% ±1.875%
3EQHM57-B-32.768P-C0.5
Frequency (MHz) Frequency Stability Code `F'. specification above
D1.25 D2.0 D2.5 D3.0 D3.5 D3.75
EUROQUARTZ LIMITED Blacknell Lane CREWKERNE Somerset TA18 Tel: (0)1460 230000 Fax: (0)1460 230001 info@euroquartz.co.uk www.euroquartz.co.uk
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