EMI Reduction Spread Spectrum Clock Oscillators A Drop-in Replacement Solution For Your EMI / EMC Compliance Problem. The principle sources of the EMI problems come from the system clocks. Therefore, rather than patching the problem with ferrite beads, EMI filters, ground plane and metal shielding, the most efficient and economical way to reduce the peak radiation energy is to use a spread spectrum clock oscillator . Compared with conventional clock oscillator , Mercury's HM series spread spectrum (dithered) clock oscillator can reduce EMI as much as -12dB. The beauty is that it is a drop-in replacement for your existing 5x7mm or 5x3.2mm clock oscillator. No need to re-spin the board. 3HM57 and 3HM53 reduces EMI and shortens 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 Embedded systems; Electrical musical instrument Automotive; GPS car navigation systems ● LCD PC monitors / LCD TVs ● ADSL; PCMCIA ● Still Digital cameras (SDCs) ● ● ● ● Modulation Types : [ 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 Spread Spectrum Clock EMI reduction fo-(fo*1.0%) fc EMI reduction Frequency fo-(fo*0.5%) F fo=fc fo+(fo*0.5%) F T fo fo+(fo*0.5%) T fo fo-(fo*1.0%) fo-(fo*0.5%) Modulation Carrier Frequency in KHz Modulation Carrier Frequency in KHz Spread Spectrum Clock ( SSC ) : Unlike a 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 all on one side of the nominal frequency ( down spread ) or 50% higher and 50% lower ( center spread ) of the nomial frequency. Down spread is preferred if over-clocking is a problem to the system. Mercury www .mercury-crystal.com ■Taiwan : Tel (886)-2-2406-2779 / [email protected] ■U.S.A: Tel: (1)-909-466-0427 / [email protected] ■China: Tel: (86)-512-5763-8100 / [email protected] HM EMI Reduction Spread Spectrum Clock Oscillators Thru-Hole SMD TTL / CMOS 3.3V Min. Max. 3.5MHz 220MHz General specifications of all available packages , at Ta=+25°C , CL=15pF Group Model , Frequency Range Spread Type R Y (1) 3HM57 - R ( 7.0 * 5.0 * 1.8 mm ) (1) 3HM57 - Y ( 7.0 * 5.0 * 1.8 mm ) ( 3.5 ~ 165.0 MHz ) ( 8.0 ~ 165.0 MHz ) (2) 3HM53 - R ( 5.0 * 3.2 * 1.2 mm ) (2) 3HM53 - Y ( 5.0 * 3.2 * 1.2 mm ) ( 6.0 ~ 160.0 MHz ) ( 10.0 ~ 160.0 MHz ) Total% Spread Percentage Down Spread Center Spread -0.5% ( D0.5 ) ± 0.25% (C0.25) Type Total% P Down Spread Center Spread 1.0% -1.0% ( D1.0 ) ± 0.5% (C0.5) 3.0% -3.0% ( D3.0 ) ±1.5 % ( C1.5 ) 1.0% -1.0% ( D1.0 ) ±0.5 % ( C0.5 ) 2.0% -2.0% ( D2.0 ) ±1.0 % ( C1.0 ) 3HM57 - P ( 7.0 * 5.0 * 1.8 mm ) ( 13.0 ~ 220.0 MHz ) Total% Down Spread Center Spread 0.5% -0.5% ( D0.5 ) ± 0.25% (C0.25) 0.75% -0.75% ( D0.75 ) ± 0.375% (C0.375) 1.25% -1.25% ( D1.25 ) ± 0.625% (C0.625) 2.0% -2.0% ( D2.0 ) ± 1.0% (C1.0) 3.0% -3.0% ( D3.0 ) ± 1.5% (C1.5) 3.75% -3.75% ( D3.75 ) ± 1.875% (C1.875) 3HM53 0.5% Not available if Tri-state chosen 1.0% -1.0% ( D1.0 ) ±0.5 % ( C0.5 ) 3HM57 3.0% -3.0% ( D3.0 ) ±1.5 % ( C1.5 ) 3.0% -3.0% ( D3.0 ) ±1.5 % ( C1.5 ) -7 dBc (min.) , 100MHz at C0.25 -9 dBc (min.) , 100MHz at C0.5 -9 dBc (min.) , 100MHz at C0.5 -12 dBc (min.) , 100MHz at C1.0 -15 dBc (min.) , 100MHz at C1.5 -15 dBc (min.) , 100MHz at C1.5 Total%"x"SSC Frequency (MHz)" / 0.12 ( dBc : with respect to no modulation ) ( dBc : with respect to no modulation ) See 125MHz example on next page 6.9 KHz (min.) ; 55.5 KHz (max.) 12 KHz (min.) ; 42 KHz (max.) 25.3 KHz (min.) ; 58.6 KHz (max.) ( Dither rate ) Frequency dependent . Call for details Frequency dependent . Call for details Frequency dependent . Call for details Output Logic CMOS ( Square Wave ) CMOS ( Square Wave ) CMOS ( Square Wave ) Input Voltage ( VDD ) VDD = +3.3V D.C. ±5% VDD = +3.3V D.C. ±5% EMI Reduction ( EMI reduction applys to the whole spectrum. ) Modulation Carrier Frequency Frequency Stability over Operating Temperature Range Frequency Stability (1) Codes ( exclude modulation ) EMI reduction (dB) = 10 Log VDD = +3.3V D.C. ±5% ± 25 ppm ± 50 ppm ± 100 ppm Commercial ( -10°C to +70°C ) A B C Industrial ( -40°C to +85°C ) D E F If non-standard , please enter the desired stability after the " C " or " I " represents . For example : " C20 " ± 20ppm over -10°C to +70°C ; " I20 " ± 20 ppm over -40°C to +85°C Output Logic " High " , " 1 " 2.4V (min.) ; 3.2V (typ.) [ at 90% V DD ] 2.0V (min.) ; 3.2V (typ.) [ at 90% V DD ] 2.4V (min.) ; [ at 80% VDD ] Output Logic " Low " , " 0 " 0.5V (max.) ; 0.2V (typ.) [ at 10% V DD ] 0.8V (max.) ; 0.2V (typ.) [ at 10% V DD ] 0.4V (max..) ; [ at 20% VDD ] Rise Time / Fall Time 4n sec. (max.) [ 10% VDD ↔ 90% VDD ] 4n sec. (max.) [ 10% VDD ↔ 90% VDD ] 1.3 n sec. (max.) [ 20% V DD ↔ 80% VDD ] 15pF 15pF 15pF 2 m sec. (typ.) ; 5 m sec. ( max.) 2 m sec. (typ.) ; 5 m sec. ( max.) 2 m sec. (typ.) ; 5 m sec. ( max.) Load Start-up Time Current Consumption 10.0 ~ 50.000 MHz : 10mA (typ.) 10.0 ~ 50.000 MHz : 10mA (typ.) 50.0 ~ 100.0 MHz : 18mA (typ.) 50.0 ~ 125.0 MHz : 27mA (typ.) , 44mA (max.) 25mA (typ.) ; Frequency dependent 50% ± 5% ( CL=15pF ; at 50% VDD ) 50% ± 5% ( CL=15pF ; at 50% VDD ) 50% ± 5% ( CL=15pF ; at 50% VDD ) ±250 ps (typ.) ; ±300 ps (max.) ±100 ps (typ.) ; ±150 ps (max.) ±100 ps (typ.) >2,000V ( per MIL-STD-883 , method 3015 ) >2,000V ( per MIL-STD-883 , method 3015 ) >2,000V ( per MIL-STD-883, , method 3015 ) -65°C to + 150°C -65°C to + 150°C -65°C to + 150°C 100.0 ~ 160.0 MHz : 35mA (typ.) Duty Cycle Cycle-to-Cycle Jitter Static Discharge Voltage Storage Temperature Aging ± 5 ppm per year (max.) ; Ta = +25°C ± 5 ppm per year (max.) ; Ta = +25°C ± 5 ppm per year (max.) ; Ta = +25°C Packaging 16mm tape and reel . 1000pcs per reel 16mm tape and reel . 1000pcs per reel 16mm tape and reel . 1000pcs per reel Pin 1 Option Tri-State enable high. Output is high impedance when taken low . Enable / disable time: 100 ms max. Do not make connection to this pad . No Tri-State option available. Mercury www .mercury-crystal.com ■Taiwan : Tel (886)-2-2406-2779 / [email protected] ■U.S.A: Tel: (1)-909-466-0427 / [email protected] ■China: Tel: (86)-512-5763-8100 / [email protected] EMI Reduction Spread Spectrum Clock Oscillators Examples Part Number Format and Example [1] [2] [3] Supply Voltage Holder Type G 3 H M 576 (1) (2) 3 H M 53 (2) 3 H M 14 G [4] [5] – Frequency Stability T - B T F T C30 [8] [6] [7] – Center Frequency Group Type – Spread type Percentage - 10.000 R C1.5 75.000 Y 100.000 P - [1] Supply voltage , " 3 " for +3.3V ; " 5 " for +5.0V [2] Holder Type [3] Please add " G " after the " type code " for RoHS compliant ( Does not apply to HM53 , HM57 series ) . D1.0 D3.0 " A " ± 25ppm ; " B " ± 50ppm ; " C " ± 100ppm ; -10°C ~ 70 °C If non-standard please enter the desired stability after " C " , for example " C15 " : represents ±15ppm over -10 to +70°C [4] " D " ± 25ppm ; " E " ± 50ppm ; " F " ± 100ppm ; -40°C ~ 85 °C If non-standard please enter the desired stability after " I " , for example " I20 " : represents ±20ppm over -40 to +85°C [5] " T " for Tri-state , Leave this space blank if no connection on pin 1 or pad 1 . [6] Frequency in MHz [7] Group " R " , " P " or " Y " [8] Spread type & percentage ; " C " for center spread , " D " for down spread EMI Test Data : 3HM57-B-100.000R , 100.0MHz Group " R " , Modulation Carrier Frequency = 34.687KHz Whole Spectrum EMI Data : 3HM57-B-100.000R , 100.0MHz Group " R " , Modulation Carrier Frequency = 34.687KHz EMI Test Data Jitter Test Data 125.0 MHz at various spread percentages. Modulation Carrier Frequency : 48.8 KHz " P " group , cycle to cycle jitter . 32.59 ps ( min. ) ; 39.76 ps ( max. ) Sample rate:20.0 G Sa/sec.;No. of sample :1000;Edge Direction: Rising edges For more technical information please visit the following web site : www . mercury -crystal.com and down load our technical note TN-020 ( Title : Low EMI Spread Spectrum Clock Oscillators ) Mercury www .mercury-crystal.com ■Taiwan : Tel (886)-2-2406-2779 / [email protected] ■U.S.A: Tel: (1)-909-466-0427 / [email protected] ■China: Tel: (86)-512-5763-8100 / [email protected] EMI Reduction Spread Spectrum Clock Oscillators Outline Dimensions ( Unit : mm ) , Suggested pad Layout for SMDs [ HM 53 ] [ HM 57 ] [ HM 42 ] [ HM 44 ] [ HM 14 ] [ HM 8 ] Mercury www .mercury-crystal.com ■Taiwan : Tel (886)-2-2406-2779 / [email protected] ■U.S.A: Tel: (1)-909-466-0427 / [email protected] ■China: Tel: (86)-512-5763-8100 / [email protected]