EURO QUARTZ 3EQHM53R Low EMI Oscillator 5 x 3.2 x 1.2mm SMD - Specification Group 'R' Page 1 of 2 Provides up to -12dB 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 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 15dB. 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) DESCRIPTION EQHM53 series low EMI oscillators can reduce system EMI by -12dB. 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 3EQHM53R Low EMI Oscillator 5 x 3.2 x 1.2mm SMD - Specification Group 'R' 6.0MHz to 160MHz Page 2 of 2 SPECIFICATION Model No: Frequency Range: Spread Types: EMI Reduction*: Modulation Carrier Frequency: 3EQHM53 (Group ‘R’) 6.0MHz to 160.0MHz See table below -7dBc min. 100MHz at C0.25** -9dBc min. 100MHz at C0.5** -15dBc min. 100MHz at C1.5** dBc reference to no modulation. 6.9kHz min, 55.5kHz max. Frequency dependent Output Logic: CMOS Input Voltage: Vdd = +3.3VDC ±5% Frequency Stability*** Commercial (-10~70°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: ±250ps typ. ±300ps 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 100ns 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. OUTLINE & DIMENSIONS 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-cm3/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 AVAILABILITY OF SPREAD TYPES AND MODULATION RATES SPREAD TYPES and % MODULATION PART NUMBER CONFIGURATION DOWN SPREAD ‘T’ for Tristate Series designation Specification Group ‘R’ 3EQHM53-BT-32.768R-C0.5 D1.0 -1% D3.0 -3% D0.5 -5% (not available if tristate required.) CENTRE SPREAD Frequency (MHz) Frequency Stability Code ‘A’ to ‘F’. See specification above C0.5 ±0.5% C1.5 ±1.5% C0.25 ±2.5% (not available is tristate required) 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