EURO QUARTZ 18EQHM572 Low EMI Oscillator 7 x 5 x 1.4mm SMD - Group 'F' (1.8 Volts) Page 1 of 2 FEATURES Provides up to -12dB reduction in system EMI ‘Drop-in’ replacement for standard clocks No need to re-design printed circuit boards Operates with 1.8 Volts supply voltage Choice of modulation rate and spread Miniature package: 7.0 mm x 5.0 mm x 1.4mm SPECIFICATION Model No: Frequency Range: EMI Reduction and Spread Types: Modulation Carrier Frequency: Output Logic: Input Voltage: Frequency Stability Commercial (0~70°C): OUTLINE & DIMENSIONS 18EQHM572 12.5MHz to 42.0MHz CMOS Vdd = +1.8 ±0.15VDC ±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’: 1.6V min., 1.85V max. Output Voltage LOW ‘0’: 0.0V max., 0.2V max. Rise/Fall Times: 2.5ns max. Load: 15pF Start-up Time: 2ms typical, 5ms max. Stabilization Time: 40ms max. Output Impedance: 30W typical Output Slew Rate: 0.4 V/ns min.; 3.0V/ns max. Current Consumption: 13MHz: 16MHz: 25MHz: 42MHz: Duty Cycle: Cyle to Cycle Jitter: Ageing: Pad 1 Option: Packaging: 2.0mA typical 2.8mA typical 3.5mA typical 5.0mA typical 50%±10% (CL=15pF, 50%Vdd) ±100ps max. ±5ppm /year max at Ta=25°C Output Enable/Disable. Output is high impedance when taken low Output enable time 100ms max. EIA 16mm tape and reel, 1k per. SPREAD TYPE & PERCENTAGE AND EMI REDUCTION RATES ENVIRONMENTAL SPECIFICATION RoHS Compliance: Moisture Sensitivity Level: Second Level Interconnect: Storage Temperature Range: Humidity: Fine Leak / Gross Leak: Total % Down Spread (D) Centre Spread (C) EMI Reduction Rate 0.5% -0.5% (D0.5) ±0.25% (C0.25) -12dB (typ.) 1% -1% (D1) ±0.5% (C0.5) -16dB (typ.) Hermetic Seal: Solderability: Reflow: Vibration: 2% -2% (D2) ±1% (C1.0) -18dB (typ.) Shock: Resistance to Solvents: Temperature Cycling: ESD Rating: ABSOLUTE MAXIMUM RATINGS Power Supply Voltage -0.5V min., +2.5V max. Input Voltage Vss-0.5V min., VDD+0.5V max. Output Voltage Vss-0.5V min., VDD+0.5V max. Operation Junction Temp. -40°C min., +125°C max. Output Current -13mA min., +13mA max. Pad Surface Finish: Weight of the Device: RoHS compliant and Pb (lead) free Level 1 (Infinite) e4 -55° to +125°C 85% RH, 85°C for 48 hours MIL-STD-883, meth. 1014, cond. A MIL-STD-883, meth. 1014, cond. C Leak Rate 2x10-8 ATM-cm3/s max. MIL-STD-2002F method 208E 260° for 10 seconds x2 MIL-STD-202F method 204, 35g, 50Hz to 2000Hz MIL-STD-202F method 213B, test condition: E, 1000g ½ sine wave MIL-STD-202, Method 215 MIL-STD-883, Method 1010 >2000V (per MIL-STD-883, method 3015) Gold (0.3um min.) over nickel (1.27um to 8.89um) 0.17 grams. 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 18EQHM572 Low EMI Oscillator 7 x 5 x 1.4mm SMD - Group 'F' (1.8 Volts) Page 2 of 2 PART NUMBER CONFIGURATION ‘T’ for Tristate Series designation Group ‘F’ Characteristics SPREAD TYPE & PERCENTAGE "D0.5" 18EQHM57-BT-20.000F-C0.5 Frequency (MHz) "D1" Down Spread -1% "D2" -2% "C0.25" ±0.25% "C0.5" Frequency Stability Code ‘A’ to ‘F’. See specification -0.5% Centre Spread "C1.0 ±0.5% ±0.1% MODULATION TYPES - EXAMPLES DESCRIPTION 18EQHM572 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. 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. INTRODUCTION 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 standard clock oscillators 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 [email protected] www.euroquartz.co.uk