3HM53 Group “R” A DROP-IN REPLACEMENT SOLUTION FOR YOUR EMI / EMC COMPLIANCE PROBLEM The principle sources of the EMI problem come from the system clocks. Therefore, rather than patch the problem with ferrite beads, EMI filters, ground plane and metal shielding, the most efficient and economic way to reduce the peak radiation energy is to use the low EMI clock oscillator. Compared with the conventional clock oscillators, Mercury HM53 series spread spectrum (dithered) clock oscillators can reduce EMI as much as 12 dB. The beauty is it is a drop-in replacement for your existing 5x7 clock oscillator. No need to re-spin the board. 3HM53 reduces your EMI and shorten your time to market. Applications ◘ Printers; Multiple function printers (MPCs) ◘ Digital copiers; PDAs ◘ Networking; LAN / WAN; Routers ◘ Storage systems (CD-ROM, VCD, DVD and HDD) ◘ Scanner; Modems; projectors ◘ Hand-held ID readers Modulation Types ◘ Embedded systems; Electrical musical instrument ◘ Automotive; GPS car navigation systems ◘ LCD PC monitors / LCD TVs ◘ ADSL; PCMCIA ◘ Still Digital cameras (SDCs) Output amplitude (dB) vs frequency span (MHz) Down spread “D”. “D1” as an example Center spread “C”. “C0.5” as an example Conventional Clock dB EMI reduction fo - (fo*1%) Spread spectrum clock fc Frequency Conventional Clock EMI reduction fo - (fo*0.5%) MERCURY fo=fc fo + (fo*0.5%) www.mercury-crystal.com Spread Spectrum Clock (SSC): Unlike the conventional clock, the mode energy of a spread spectrum clock is spread over a wider bandwidth, resulting from the frequency modulation technique. The modulation carrier frequency is in the KHz range which makes the modulation process transparent to the oscillator frequency. The controlled modulation process can be on all of one side of the nominal frequency (down spread) or 50% up and 50% down (center spread). The down spread is preferred if over-clocking is a problem to the system. Taiwan: TEL (886)-2-2406-2779, FAX (886)-2-2496-0769, e-mail: [email protected] U.S.A.: TEL (1)-909-466-0427, FAX (1)-909-466-0762, e-mail: [email protected] Page 1 of 5 April. 19. 2005 Rev. C General Specifications: at Ta=+25°C, CL=15 pF Mercury Model Frequency Range Spread Type Spread Percentage (Part number suffix) (tolerance : ±2% of the total % EMI Reduction (Reduction is applied to the entire spectrum) 3HM53 Group “R” 6.0 ~160.0 MHz Total % Down Spread (D) Center Spread (C) Modulation Carrier Frequency (Dither rate) Output Logic Input Voltage (VDD) Output Voltage “High”; “1” 6.9 KHz min.; 55.5 KHz max.; Frequency dependent. Call for details. CMOS Square Wave VDD = +3.3 V D.C. ±5% Commercial (0°C to +70°C): “A”: ±25 ppm ; “B’: ±50 ppm; “C”:±100 ppm Industrial (-40°C to +85°C): “D”: ±25 ppm ; “E’: ±50 ppm; “F”:±100 ppm 2.0 V min.; 3.2 V typical (at 90% VDD) Output Voltage “Low”; “0” 0.8 V max. ; 0.2 V typical (at 10% VDD) Rise Time / Fall Time 4 n sec. max. (10% VDD ↔ 90% VDD) 15 pF 2 ms typical; 5 ms max. 2 ms max. 10.0 MHz: 7 mA; 32.768 MHz: 8 mA 75.0 MHz: 17 mA; 125 MHz: 18 mA 50%±5%. ( CL=15 pF ;at 50% VDD) ±250 ps typical; ±300 ps max. 40 ohms typical >2000 V (per MIL-STD-883, method 3015) -65°C to +150°C ±5 ppm per year max.; Ta=+25°C 16 mm tape and reel. 1000 pcs per reel Output is high impedance when taken low. Output enable /disable time: 100 ns max. Frequency Stability (exclude modulation) Load Start-up Time Stabilization Time Current Consumption Duty Cycle Cycle-to-cycle Jitter Output Impedance Static Discharge Voltage Storage Temperature Aging Packaging Pin 1 Function 1% -1% (D1) ±0.5 (C0.5) 3% -3% (D3) ±1.5 (C1.5) -9 dBc min. 100 MHz at C0.5 -15 dBc min. 100 MHz at C1.5 With respect to the dB level when no modulation. 1 2 Environmental Performance Specifications Green Requirement Storage temp. range Humidity Hermetic seal Solderability Reflow Vibration Shock Pad Connections Tri-State 3 SSC Output Ground 4 +3.3 V D.C. RoHS Compliant and Pb (lead) free -55 to +125°C 85% RH, 85°C, 48 hours Leak rate 2x10-8 ATM-cm3/sec max. MIL-STD-202F method 208E 260°C for 10 sec. MIL-STD-202F method 204, 35G, 50 to 2000 Hz MIL-STD-202F method 213B, test condition. E, 1000GG ½ sine wave Page 2 of 5 Apr. 19, 2005 Rev. C How to Order: Part number Example “T”:Tri-State Group 3HM53-BT-32.768R-C0.5 Frequency Stability Code “A” ~”F”. See table above Spread Types and % Down Spread D1 -1% D3 -3% Center Spread C0.5 ±0.5% C1.5 ±1.5% Frequency (MHz) Other Packages Available: HM57: 5x7x1.8 mm 4 pad ceramic SMDs HM14: Full size 4 pin DIPs HM8: Half size 4 pin DIPs HM42: 9.6x11.4x2.5 mm FR4 base leadless SMDs HM44: 9.6x11.4x4.7 mm FR4 base leadless SMDs Please visit www.mercury-crystal.com Instantaneous Frequencies (Example of 100 MHz) If over-clocking is a problem to your system please choose down spread Total Spread % 1% 3% Down Spread Instantaneous Frequency min. max. Down Range Up Range - 1% 0% -10,000 ppm 0 ppm 99.000000 100.000000 - 3.0% 0% -30,000 ppm 0 ppm 97.000000 100.000000 Page 3 of 5 Center Spread Instantaneous Frequency min. max. Down Range Up Range -0.5 % +0.5% -5000 ppm +5000 ppm 99.500000 100.500000 -1.5 % +1.5% -15,000 ppm +15,000 ppm 98.500000 101.500000 Apr. 19, 2005 Rev. C 3HM53-32.768 at No Modulation and at Center Spread 1.5%: 13.1 dBc EMI reduction -9.9 dB -23.0 dB No Modulation C1.5 EMI Reduction of 3HM53 100 MHz at C0.5 and C1.5 (main mode only) Modulation Carrier Frequency = 34.687 KHz TS305B Spectrumanalyzer Waveform@SSC=OFF TS305B Spectrumanalyzer Waveform@SSC=+/-0.25% C0.25 (center spread ±0.25%) No modulation 0 0 -3.33dBm -3.33dBm -10 -20 -20 -30 -30 -40 -40 [dBm] [dBm] -10 -50 -60 -60 -70 -80 -80 -90 -90 -100 -100 97 98 99 100 101 102 103 -11.19dBm -50 -70 96 -11.19dBm 104 96 97 98 99 Frequency[MHz] TS305B Spectrumanalyzer Waveform@SSC=+/-0.5% 0 0 -10 -12.98dBm -12.98dBm -40 [dBm] [dBm] -30 -40 -50 -60 -70 -80 -90 -90 -100 -100 100 101 102 103 104 -18.54dBm -18.54dBm -60 -80 99 104 -50 -70 98 103 -20 -30 97 102 C1.5 (center spread ±1.5%) -10 96 101 TS305B Spectrumanalyzer Waveform@SSC=+/-1.5% C0.5 (center spread ±0.5%) -20 100 Frequency[MHz] 103 104 Frequency[MHz] 96 97 98 99 100 101 102 Frequency[MHz] Page 4 of 5 Apr. 19, 2005 Rev. C EMI Reduction of 3HM53 100 MHz at C0.5 and C1.5 (the whole spectrum) TS305BSpectrumAnalyzer Waveform@SSC=OFF TS305BSpectrumAnalyzer Waveform@SSC=+/-0.25% No Modulation 0 -10 -3.21 0 -10.04 -20 -20.15 -24.25 -30 -10 -25.40 -35.04 -40 -30 -50 -40 -60 -70 -11.21 -20.19 -20 [dBm] [dBm] C0.25 (center spread ±0.25%) -33.37 -37.72 -38.87 -48.97 -50 -60 -80 -70 -90 -80 -100 -90 -100 0 100 200 300 400 500 600 700 800 900 1000 1100 1200 0 100 200 300 400 500 600 700 800 900 1000 1100 1200 Frequency[MHz] Frequency[MHz] TS305BSpectrumAnalyzer Waveform@SSC=+/-0.5% TS305BSpectrumAnalyzer Waveform@SSC=+/-1.5% C0.5 (center spread ±0.5%) C1.5 (center spread ±1.5%) 0 -20 [dBm] -30 -40 -10 -12.80 -20 -24.45 -36.75 -30 -41.23 -50 -42.47 -51.40 -60 [dBm] -10 0 -40 -29.09 -41.22 -50 -46.35 -48.47 -58.77 -60 -70 -70 -80 -80 -90 -90 -100 -19.46 -100 0 100 200 300 400 500 600 700 800 900 1000 1100 1200 0 100 200 300 400 500 600 700 800 900 1000 1100 1200 Frequency[MHz] Frequency[MHz] For more technical information please visit www.mercury-crystal.com and download our technical note TN-020 (Title: “Low EMI Spread Spectrum Clock Oscillators”). Page 5 of 5 Apr. 19, 2005 Rev. C