EMI Reduction Spread Spectrum Clock Oscillators

Transcription

1 A Drop-in Replacement Solution or 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 7 x 5mm, 5 x 3.2mm or 3.2 x 2.5 mm clock oscillator. No need to re-spin the board. 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 Center spread C " db Conventional Clock EMI reduction Spread Spectrum Clock EMI reduction fo-(fo*1.0%) fc requency fo-(fo*0.5%) fo=fc fo+(fo*0.5%) fo T fo+(fo*0.5%) fo T fo-(fo*1.0%) fo-(fo*0.5%) Modulation Carrier requency in KHz Modulation Carrier requency 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.

2 HM R group Y group P group Thru-Hole SMD TTL CMOS 3.3V Min. Max. 3.5 MHz 220 MHz General specifications of all available packages, at Ta=+25 C, CL=15p Group R group Y group P group Model, requency Range 3HM572 - R ( 7.0 * 5.0 * 1.4 mm ) ( 3.5 ~ MHz ) 3HM53 - R ( 5.0 * 3.2 * 1.2 mm ) ( 6.0 ~ MHz ) 3HM572 - Y ( 7.0 * 5.0 * 1.4 mm ) ( 8.0 ~ MHz ) 3HM53 - Y ( 5.0 * 3.2 * 1.2 mm ) ( 10.0 ~ MHz ) 3HM57 - P ( 7.0 * 5.0 * 1.8 mm ) ( 13.0 ~ MHz ) Spread Type Total% Down Spread Center Spread Type Total% Down Spread Center Spread Total% Down Spread Center Spread Spread Percentage 0.5% -0.5% ( D0.5 ) ± 0.25% ( C0.25 ) Not available if Tri-state chosen 3HM53 1.0% 1.0% -1.0% ( D1.0 ) -1.0% ( D1.0 ) ± 0.5% ( C0.5 ) ±1.5 % ( C1.5 ) ±0.5 % ( C0.5 ) 0.5% 0.75% 1.25% -0.5% ( D0.5 ) -0.75% ( D0.75 ) -1.25% ( D1.25 ) ± 0.25% ( C0.25 ) ± 0.375% ( C0.375 ) ± 0.625% ( C0.625 ) 1.0% -1.0% ( D1.0 ) ±0.5 % ( C0.5 ) 3HM57 2.0% -2.0% ( D2.0 ) ±1.0 % ( C1.0 ) 2.0% -2.0% ( D2.0 ) ± 1.0% ( C1.0 ) ± 1.5% ( C1.5 ) ±1.5 % ( C1.5 ) ±1.5 % ( C1.5 ) 3.75% -3.75% ( D3.75 ) ± 1.875% ( C1.875 ) EMI Reduction 7 db (min.), 100MHz at C db (min.), 100MHz at C0.5 ( EMI reduction applys to 9 db (min.), 100MHz at C db (min.), 100MHz at C1.0 7 to 16 db ( typical ) for the main mode the whole spectrum. ) 15 db (min.), 100MHz at C db (min.), 100MHz at C1.5 Modulation Carrier req. 6.9 KHz (min.) ; 55.5 KHz (max.) 12 KHz (min.) ; 42 KHz (max.) 25.3 KHz (min.) ; 58.6 KHz (max.) ( Dither rate ) requency dependent. Call for details requency dependent. Call for details requency dependent. Call for details Output Logic CMOS ( Square Wave ) CMOS ( Square Wave ) CMOS ( Square Wave ) Input Voltage ( V DD ) Output Logic " High ", "1 " 2.4V (min.) [ at 90% V DD ] 2.4V (min.) ; 3.2V (typ.) [ at 90% V DD ] 2.4V (min.) [ at 90% V DD ] Output Logic " Low "," 0 " 0.5V (max.) [ at 10% V DD ] 0.5V (max.) ; 0.2V (typ.) [ at 10% V DD ] 0.4V (max..) [ at 10% V DD ] Rise Time / all Time 4n sec. (max.) [ 10% V DD 90% V DD ] 6n sec. (max.) [ 10% V DD 90% V DD ] 4n sec. (max.) [ 10% V DD 90% V DD ] Load 15p 15p 15p Start-up Time 2 m sec. (typ.) ; 5 m sec. ( max.) 2 m sec. (typ.) ; 5 m sec. ( max.) 2 m sec. (typ.) ; 5 m sec. ( max.) 10.0 ~ MHz : 10mA (typ.) 10.0 ~ MHz : 10mA (typ.) Current Consumption 50.0 ~ MHz : 18mA (typ.) 50.0 ~ MHz : 27mA (typ.), 44mA (max.) 25mA (typ.) ; requency dependent ~ MHz : 35mA (typ.) Duty Cycle 50% ± 5% ( CL=15p ; at 50% V DD ) 50% ± 5% ( CL=15p ; at 50% V DD ) 50% ± 5% ( CL=15p ; at 50% V DD ) Cycle-to-Cycle Jitter ±250 ps (typ.) ; ±300 ps (max.) ±100 ps (typ.) ; ±150 ps (max.) ±100 ps (typ.) Storage Temperature -55 C to C -55 C to C -55 C to C 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 requ. Stability over Operating Temperature Range ± 25 ppm ± 50 ppm ± 100 ppm requency Stability Codes ( exclude modulation ) Commercial ( -10 C to +70 C ) A B C Industrial ( -40 C to +85 C ) D E Pin 1 Option Static Discharge Voltage Packaging Tri-State enable high. Output is high impedance when taken low. Enable / disable time: 100 ms max. >2,000V ( per MIL-STD-883, method 3015 ) 16mm tape and reel. 1000pcs per reel Do not make connection to this pad. No Tri-State option available.

3 HM B group Programmable Quick Turn SMD TTL CMOS 2.5 V 3.3 V Min. 3.0MHz Max. 200 MHz Reduces electromagnetic Interference ( EMI ) by approx. 12 db to 18 db. Drop-In Replacement for Conventional Oscillators No Need to Re-Spin the Board or Solder Pad Layout Operates with a +2.5V and 3.3V Supply Voltage RoHS Compliant and lead - free 5.0 x 3.2 or 7.0 x 5.0 mm package sizes General specifications of all available packages, at Ta=+25 C, CL=15p Group Supply Voltage requency Range B group V ± 10% V ± 10% 3.0 MHz ~ 166 MHz 3.0 MHz ~ 200 MHz Pakage Model ( Dimemsions ) HM53 ( 5.0 * 3.2 * 1.2 mm ) HM572 ( 7.0 * 5.0 * 1.4 mm ) HM53 ( 5.0 * 3.2 * 1.2 mm ) HM572 ( 7.0 * 5.0 * 1.4 mm ) Spread Type Total Center Spread ( C ) Down Spread ( D ) Center Spread ( C ) Down Spread ( D ) Spread Percentage 0.25 % ( min.) ± % ( C0.125 ) % ( D0.25 ) ± % ( C0.125 ) % ( D0.25 ) EMI Reduction Rate 4.0 % ( max.) ± 2.0 % ( C2.0 ) % ( C4.0 ) ± 2.0 % ( C2.0 ) % ( C4.0 ) Modulation Carrier req. ( Dither rate ) 30 KHz ( min.) ; 40.0 KHz ( max.) requency dependent. Call for details. Current Consumption ( typical ) Output Impedance 10 MHz : 10 ma 25 MHz : 12 ma 100 MHz : 17 ma 30Ω( typical ), depends on the output frequency, spread type and the spread magnitude 200 MHz : 25 ma requency Stability over Operating Temperature Range ± 25 ppm ± 50 ppm ± 100 ppm requency Stability Codes ( exclude modulation ) Commercial ( -10 C to +70 C ) A B C Industrial ( -40 C to +85 C ) D E Output Logic CMOS ( Square Wave ) DC Electrical Characteristics Rise Time / all Time 5.0 n sec. ( max.) [ 10% V DD 90% V DD ] Input Voltage ( V DD ) V DD = + 2.5V ± 5 % V DD = + 3.3V ± 5 % Load 15 p ( max.) Output Logic " High ", V OH 2.25 V ( min.) 2.97 V ( min.) Start-up Time 3.0 m sec. ( typical ) ; 5 m sec. ( max.) Output Logic " Low ", V OL 0.25 V ( max.) 0.33 V ( max.) Stabilization Time 40 m sec. ( max.) Aging ± 5 ppm per year ( max.) ; Ta = +25 C Duty Cycle 50% ± 10% ( CL=15p ; at 51% V DD ) Cycle-to-Cycle Jitter 100 ps rms ( max.) Packaging 1000 pcs per reel. Pin 1 unction When taken LOW When taken HIGH or float Output is high impedance when taken low. Internal circuit is still operating. Output Output enable /disable time: 100 ns max. Typical spectrum with and without spread spectrum at the main mode Block Diagram

4 HM N group Low Cost and Low Profile SMD CMOS 3.3 V Min. Max. 8.0 MHz 128 MHz With the success of group R and P EMI reduction spread spectrum clocks (SSCs), Mercury continues its effort and introduces this lower profile ( 1.4 mm package height instead of 1.8 mm ) and lower cost group N SSC. The most efficient way to reduce EMI (Electromagnetic Interference) is to reduce it from its principle source the clock oscillator. Group N SSC is an integrated clock module composed of a spread spectrum clock and a quartz crystal, it can reduce EMI efficiently up to 15 db while providing the clock speed needed for the system. It is a drop-in replacement for a standard 5x7 mm non-ssc clocks, EMI is reduced without changing the board layout and pin configuration. General specifications of all available packages, at Ta=+25 C, CL=15p Group N group requency Range 8.0 ~ MHz Pakage Model 3HM572 - N ( 7.0 * 5.0 * 1.4 mm ) ; 3HM53 - N ( 5.0 * 3.2 * 1.2 mm ) ; 3HM43G - N ( 11.4 * 9.6 * 3.1 mm ) requency Range Modulation Carrier Spread Type and Modulation Magnitude (%) (MHz) requency (KHz) ( Use the code in parenthesis for ordering ) fo Center Spread ( code for ordering ) Down Spread ( code for ordering ) 8.0 ~ 9.99 ±1.4% ( C1.4 ) ±0.5% ( C0.5 ) -2.8% ( D2.8 ) -1.0% ( D1.0 ) Spread Type 10.0 ~ ±1.3% ( C1.3 ) ±0.4% ( C0.4 ) -2.6% ( D2.6 ) -0.8% ( D0.8 ) fo / ~ ±1.2% ( C1.2 ) ±0.4% ( C0.4 ) -2.4% ( D2.4 ) -0.8% ( D0.8 ) Spread Percentage 14.0 ~ ±1.1% ( C1.1 ) ±0.3% ( C0.3 ) -2.2% ( D2.2 ) -0.6% ( D0.6 ) 16.0 ~ ±1.4% ( C1.4 ) ±0.5% ( C0.5 ) -2.8% ( D2.8 ) -1.0% ( D1.0 ) EMI Reduction Rate 20.0 ~ ±1.3% ( C1.3 ) ±0.4% ( C0.4 ) -2.6% ( D2.6 ) -0.8% ( D0.8 ) fo / ~ ±1.2% ( C1.2 ) ±0.4% ( C0.4 ) -2.4% ( D2.4 ) -0.8% ( D0.8 ) 28.0 ~ ±1.1% ( C1.1 ) ±0.3% ( C0.3 ) -2.2% ( D2.2 ) -0.6% ( D0.6 ) 32.0 ~ ±1.4% ( C1.4 ) ±0.5% ( C0.5 ) -2.8% ( D2.8 ) -1.0% ( D1.0 ) 40.0 ~ ±0.4% ( C0.4 ) -2.6% ( D2.6 ) -0.8% ( D0.8 ) fo / 256 ±1.3% ( C1.3 ) 48.0 ~ ±1.2% ( C1.2 ) ±0.4% ( C0.4 ) -2.4% ( D2.4 ) -0.8% ( D0.8 ) 56.0 ~ ±1.1% ( C1.1 ) ±0.3% ( C0.3 ) -2.2% ( D2.2 ) -0.6% ( D0.6 ) 64.0 ~ ±1.4% ( C1.4 ) ±0.5% ( C0.5 ) -2.8% ( D2.8 ) -1.0% ( D1.0 ) 80.0 ~ ±1.3% ( C1.3 ) ±0.4% ( C0.4 ) -2.6% ( D2.6 ) -0.8% ( D0.8 ) fo / ~ ±1.2% ( C1.2 ) ±0.4% ( C0.4 ) -2.4% ( D2.4 ) -0.8% ( D0.8 ) ~ ±1.1% ( C1.1 ) ±0.3% ( C0.3 ) -2.2% ( D2.2 ) -0.6% ( D0.6 ) EMI Reduction Up to15 db reduction typical. undamental and higher order harmonics. Variation of EMI Reduction ( Across Temperature ) 5% max. across -40 C to +85 C. With respect to the room temperature Modulation Carrier req. ( Modulation rate, Dither rate ) KHz ( min.) ; KHz ( max.) requency dependent. Output Impedance 45 Ω to 90 Ω, depends on the output frequency, spread type and the spread magnitude requency Stability over Operating Temperature Range ± 25 ppm ± 50 ppm ± 100 ppm requency Stability Codes ( exclude modulation ) Commercial ( -10 C to +70 C ) A B C Industrial ( -40 C to +85 C ) D E DC Electrical Characteristics Output Logic CMOS ( Square Wave ) Rise Time / all Time 7 n sec. ( max.) [ 10% V DD 90% V DD ] Input Voltage ( V DD ) Load 15 p ( max.) Output Logic " High ", V OH 2.4V ( min.) I OH = -4mA, at spread spectrum outpit Start-up Time 5 m sec. ( typical ) ; 10 m sec. ( max.) Output Logic " Low ", V OL 0.4V (max.) ; I OL = -4mA, at spread spectrum outpit Stabilization ( PLL Lock ) Time 2 m sec. ( max.) Aging ± 5 ppm per year ( max.) ; Ta = +25 C Duty Cycle 50% ± 5% ( CL=15p ; at 50% V DD ) Pin 1 Option No Connection. Packaging 1000 pcs per reel. Current Consumption 8.0 ~ 32.0 MHz : 12 ma ( max.) Cycle-to-Cycle Jitter req. typical max. req. typical max ~ 64.0 MHz : 13 ma ( max.) Unit : requency : ( MHz ) ~ MHz : 17 ma ( max.) Jitter : ps Typical spectrum with and without spread spectrum at the main mode Block Diagram

5 Examples Part Number ormat and Example [ 1 ] [ 2 ] [ 3 ] Supply Holder G Voltage Type [ 4 ] [ 5 ] [ 6 ] [ 7 ] [ 8 ] requency Center Group Spread type T Stability requency Type Percentage (1) 3 H M B T R - C1.5 (2) 3 H M 53 - T Y - D1.0 (3) 3 H M 43 G - D P - D3.0 [ 1 ] Supply voltage code, " 18 " for +1.8 v ; " 3 " for +3.3V ; " 5 " for +5.0V [ 2 ] Holder Type ( HM32, HM53, HM57, HM572 or HM43 ) [ 3 ] Please add " G " after the " holder type code " for RoHS compliant ( Applied to HM43 only, HM32, HM53, HM57 and HM572 are RoHS compliant ). -10 C ~ 70 C " A " ± 25ppm ; " B " ± 50ppm ; " C " ± 100ppm ; [ 4 ] -40 C ~ 85 C " D " ± 25ppm ; " E " ± 50ppm ; " " ± 100ppm ; [ 5 ] " T " for Tri-state, " T " is standard for all grounds except for group P. [ 6 ] requency in MHz [ 7 ] Group " N ", " ", " R ", " P " or " Y " [ 8 ] Spread type & percentage ; " C " for center spread, " D " for down spread EMI Test Data : 3HM57-B R, 100.0MHz Group " R ", Modulation Carrier requency = KHz Whole Spectrum EMI Data : 3HM57-B R, 100.0MHz Group " R ", Modulation Carrier requency = KHz EMI Test Data ( " P " group ) MHz at various spread percentages. Modulation Carrier requency : 48.8 KHz Jitter Test Data ( " P " group ) " P " group, cycle to cycle jitter ps ( min. ) ; ps ( max. ) Sample rate : 20.0 G Sa/sec.;No. of sample :1000;Edge Direction: Rising edges or 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 )

6 Outline Dimensions ( Unit : mm ), Suggested pad Layout for SMDs [ HM 53 ] or group : B N R Y [ HM 57 ] or group : P Y [ HM 572 ] or group : B N R Y [ HM 43 ] or group : B N R Y