(preliminary) abx8037/38/39 38-640mhz low phase noise xo 30332 esperanza., rancho santa margarita, ca 92688 ph: 949-546-8000 fax: 949-546-8001 www.abracon.com 9/1/05 page 1 features ? less than 0.4ps rms (12khz-20mhz) phase jitter for all frequencies . ? less than 25ps peak to peak jitter for all frequencies. ? low phase noise output (@ 1mhz frequency offset ? -144dbc/hz for 106.25mhz ? -144dbc/hz for 156.25mhz ? -144dbc/hz for 212.5mhz ? -140dbc/hz for 312.5mhz, ? -131dbc/hz for 622.08mhz ? 19mhz-40mhz crystal input. ? 38mhz-640mhz output. ? available in pecl, lvds, or cmos outputs. ? output enable selector. ? 2.5v & 3.3v operation. ? available in 3x3 qfn or 16-pin tssop packages. description the abx803x is a monolithic low jitter and low phase noise high performance clock, capable of maintaining 0.4ps rms phase jitter and cmos, lvds or pecl outputs, covering a wide frequency output range up to 640mhz. it allows high performance and high frequency output, using a low cost fundamental crystal of between 19-40mhz. the frequency selector pads of abx803x enable output frequencies of (2, 4, 8, or 16) * f xin . the abx803x is designed to address the demanding requirements of high perf ormance applications such fiber channel, serial ata, ethernet, san, etc. package pin assignment 16-pin tssop 3x3 qfn note1: qbar is used for single ended cmos output . note2: ^ denotes internal pull up resistor. block diagram abx803x 1 2 3 4 5 6 7 8 vddana 9 10 11 12 13 14 15 16 xin xout sel2^ oe_ctrl dnc gndana lp sel0^ gndbuf sel1^ gndbuf qbar vddbuf q lm phase detector charge pump loop filter vco (f xin x16) vco divider xtal osc qbar oe xin xout q + performance tuner output divider (1,2,4,8) abx803x gndbuf vddbuf q qbar xin sel0^ sel1^ vddana sel2^ xout oe_ctrl dnc lp gndana lm gndbuf 4 16 15 14 13 12 11 10 9 8 7 6 5 123
(preliminary) abx8037/38/39 38-640mhz low phase noise xo 30332 esperanza., rancho santa margarita, ca 92688 ph: 949-546-8000 fax: 949-546-8001 www.abracon.com 9/1/05 page 2 output enable l ogical levels part # oe state 0 (default) output enabled abx8038 (pecl) 1 tri-state 0 tri-state abx8037 & 39 (cmos or lvds) 1 (default) output enabled pin descriptions name tssop pin number 3x3mm qfn pin number type description vddana 1 11 p vdd for analog circuitry. xin 2 12 i crystal input pin. (see crystal specifications on page 3). xout 3 13 o crystal output pin. (see crystal specifications on page 3). sel2 4 14 i output frequency selector pin. oe_ctrl 5 15 i output enable control pin. (see oe_ctrl logic levels on page 1). dnc 6 16 - do not connect gndana 7 1 p ground for analog circuitry. lp 8 2 - lm 9 3 - tuning inductor connection. the inductor is recommended to be a high q small size 0402 or 0603 smd component, and must be placed between lp and adjacent lm pin. place inductor as close to the ic as possible to minimize parasitic effects and to maintain inductor q. gndbuf 10 4 p gnd connection for output buffer circuitry. q 11 5 o pecl or lvds output. vddbuf 12 6 p vdd connection for output buffer circuitry. vddbuf should be separately decoupled from other vdds whenever possible. qbar 13 7 o complementary pecl, lvds output; or single ended cmos output. gndbuf 14 8 p gnd connection for output buffer circuitry. sel1 15 9 i output frequency selector pin. sel0 16 10 i output frequency selector pin.
(preliminary) abx8037/38/39 38-640mhz low phase noise xo 30332 esperanza., rancho santa margarita, ca 92688 ph: 949-546-8000 fax: 949-546-8001 www.abracon.com 9/1/05 page 3 frequency selection table sel2 sel1 sel0 selected multiplier/output frequency 0 0 0 vco max* 0 0 1 vco min* 0 1 0 reserved 0 1 1 reserved 1 0 0 fin x 2 1 0 1 fin x 8 1 1 0 fin x 16 1 1 1 fin x 4 all sel pads have internal pull-ups (default value is ?1?). bond to gnd to set to 0. * special test modes to help selecting the inductor value for the target output frequency. performance tuning & in ductor value selection please refer to abracon?s ?tuning assistant? software to automatically calculate the optimum inductor values. in addition, the chart below could be used as a refer ence for quick inductor value selection. use the special test modes ?vco max? and ?vco min? to determine the optimum inductor value. ?vco max? represents the high end of the vco range and ?vco min? represents the low end of the vco range. the output frequency in the ?vco max? and ?vco min? test modes is vco/16. this means that the output frequencies are around the crystal frequency that will be used. the optimu m inductor value is where the target crystal frequency is closest to the middle between the ?vco max? and ?vco mi n? output frequencies. in th is case the vc o will lock in the middle of its tuning range with maximum margin on either side.
(preliminary) abx8037/38/39 38-640mhz low phase noise xo 30332 esperanza., rancho santa margarita, ca 92688 ph: 949-546-8000 fax: 949-546-8001 www.abracon.com 9/1/05 page 4 electrical specifications 1. absolute maximum ratings parameters symbol min. max. units supply voltage v dd 4.6 v input voltage, dc v i -0.5 v dd +0.5 v output voltage, dc v o -0.5 v dd +0.5 v storage temperature t s -65 150 c ambient operating temperature* t a -40 85 c junction temperature t j 125 c lead temperature (soldering, 10s) 260 c esd protection, human body model 2 kv exposure of the device under conditions beyond the limits specif ied by maximum ratings for extended periods may cause permanent damage to the device and affect product reliability. thes e conditions represent a stress rating on ly, and functional operations of the devic e at these or any other conditions above the operational limits noted in this spec ification is not implied. * note : operating temperature is guaranteed by design for all parts (commercial and industrial), but tested for commercial grade only . 2. crystal specifications parameters symbol conditions min. typ. max. units crystal resonator frequency f xin parallel fundamental mode 19 40 mhz crystal loading rating c l (xtal) 17.7 pf crystal shunt capacitance c 0 (xtal) 5 pf recommended esr r e at cut 30 ? note : crystal loading rating: 17.7pf is the loading the crystal sees from the xo chip. it is assumed that the crystal will be at no minal frequency at this load. if the crystal requires less load to be at nominal frequenc y, then a capacitor can placed in series with the crystal. if the crystal requires more load to be at nominal frequency, capacitors can be placed from xi n and xout to ground. this however may reduce the oscillator g ain. 3. general electrical specifications parameters symbol conditions min. typ. max. units pecl/lvds/cmos 38mhz (preliminary) abx8037/38/39 38-640mhz low phase noise xo 30332 esperanza., rancho santa margarita, ca 92688 ph: 949-546-8000 fax: 949-546-8001 www.abracon.com 9/1/05 page 5 4. jitter specifications parameters conditions freque ncy min. typ. max. units 106.25mhz 0.4 0.5 156.25mhz 0.4 0.5 212.5mhz 0.4 0.5 312.5mhz 0.4 0.5 integrated jitter rms integrated 12 khz to 20 mhz 622.08mhz 0.4 0.5 ps 106.25mhz 3 5 156.25mhz 3 5 212.5mhz 3 5 312.5mhz 3 5 period jitter rms with capacitive decoupling between vdd and gnd. over 10,000 cycles. 622.08mhz 6 8 ps 106.25mhz 20 30 156.25mhz 20 30 212.5mhz 20 30 312.5mhz 20 30 period jitter peak-to- peak with capacitive decoupling between vdd and gnd. over 10,000 cycles. 622.08mhz 50 70 ps 5. phase noise specifications parameters freq. @10hz @100hz @1khz @ 10khz @100khz @1m @10m units 106.25mhz -66 -96 - 122 -132 -126 -144 -150 156.25mhz -62 -92 - 120 -132 -128 -140 -150 212.5mhz -62 -92 - 118 -126 -120 -140 -150 312.5mhz -59 -85 - 117 -128 -125 -139 -148 phase noise relative to carrier (typical) 622.08mhz -49 -84 - 111 -120 -118 -128 -138 dbc/hz 6. cmos electrical characteristics parameters symbol conditions min. typ. max. units i oh v oh = v dd -0.4v, v dd =3.3v 30 ma output drive current i ol v ol = 0.4v, v dd = 3.3v 30 ma output clock rise/fall time 0.3v ~ 3.0v with 15 pf load 0.7 ns output clock rise/fall time 20%-80% with 50 ? load 0.3 ns
(preliminary) abx8037/38/39 38-640mhz low phase noise xo 30332 esperanza., rancho santa margarita, ca 92688 ph: 949-546-8000 fax: 949-546-8001 www.abracon.com 9/1/05 page 6 8. lvds electrical characteristics parameters symbol conditions min. typ. max. units output differential voltage v od 247 355 454 mv v dd magnitude change ? v od -50 50 mv output high voltage v oh 1.4 1.6 v output low voltage v ol 0.9 1.1 v offset voltage v os 1.125 1.2 1.375 v offset magnitude change ? v os r l = 100 ? (see figure) 0 3 25 mv power-off leakage i oxd v out = v dd or gnd v dd = 0v 1 10 ua output short circuit current i osd -5.7 -8 ma 9. lvds switching characteristics parameters symbol conditions min. typ. max. units differential clock rise time t r 0.2 0.7 1.0 ns differential clock fall time t f r l = 100 ? c l = 10 pf (see figure) 0.2 0.7 1.0 ns out out v od v os 50 ? 50 ? out v diff r l = 100 ? c l = 10pf c l = 10pf lvds switching test circuit lvds levels test circuit lvds transistion time waveform out out out 0v (differential) 0v 20% 80% 20% 80% t r t f v diff
(preliminary) abx8037/38/39 38-640mhz low phase noise xo 30332 esperanza., rancho santa margarita, ca 92688 ph: 949-546-8000 fax: 949-546-8001 www.abracon.com 9/1/05 page 7 10. pecl electrical characteristics parameters symbol conditions min. max. units output high voltage v oh v dd ? 1.025 v output low voltage v ol r l = 50 ? to (v dd ? 2v) (see figure) v dd ? 1.620 v 11. pecl switching characteristics parameters symbol conditions min. typ. max. units clock rise time t r @20/80% - pecl 0.6 1.5 ns clock fall time t f @80/20% - pecl 0.5 1.5 ns out out 50 ? 50 ? pecl levels test circuit pecl transistion time waveform out out 50% 20% 80% t r t f vdd duty cycle 45 - 55% 55 - 45% 50% out out t skew pecl output skew 2.0v
(preliminary) abx8037/38/39 38-640mhz low phase noise xo 30332 esperanza., rancho santa margarita, ca 92688 ph: 949-546-8000 fax: 949-546-8001 www.abracon.com 9/1/05 page 8 layout recommendations pcb layout considerations fo r performance optimization the following guidelines are to assist you with a performance optimized pcb design: - keep all the pcb traces to abx803x as short as possible, as well as keepi ng all other traces as far away from it as possible. - place the crystal as close as possible to both crystal pins of the device. this will reduce the cross-talk between the crystal and the other signals. - separate crystal pin traces from the other signals on the pcb, but allow ample distance between the two crystal pin traces. - place a 0.01f~0.1f decoupling capacitor between vdd and gnd, on the component side of the pcb, close to the vdd pin. it is not recommended to place this component on the backside of the pcb. going through vias will reduce the signal integrity, causing additional jitter and phase noise. - it is highly recommended to keep the vdd and gnd traces as short as possible. - when connecting long traces (> 1 inch) to a cmos output, it is important to design the traces as a transmission line or ?stripline?, to avoid reflections or ringing. in this case, the cmos output needs to be matched to the trace impedance. usually ?striplines? are designed for 50 ? impedance and cmos outputs usually have lower than 50 ? impedance so matching can be achieved by adding a resistor in series with the cmos output pin to the ?stripline? trace. - please contact abracon for the application note on how to design outputs driving long traces or the gerber files for the abx80 layout. abx803x (xo) 16 pin tssop abx803x (xo) 3x3 qfn
(preliminary) abx8037/38/39 38-640mhz low phase noise xo 30332 esperanza., rancho santa margarita, ca 92688 ph: 949-546-8000 fax: 949-546-8001 www.abracon.com 9/1/05 page 9 package information 16-pin ssop c l a eh d a1 e b 16 pin tssop ( mm ) symbol min. max. a - 1.20 a1 0.05 0.15 b0.190.30 c0.090.20 d4.905.10 e4.304.50 h 6.40 bsc l0.450.75 e 0.65 bsc 16-pin 3x3 qfn
(preliminary) abx8037/38/39 38-640mhz low phase noise xo 30332 esperanza., rancho santa margarita, ca 92688 ph: 949-546-8000 fax: 949-546-8001 www.abracon.com 9/1/05 page 10 ordering information abracon corporation, reserves the right to make changes in its products or specifications, or bo th at any time without notice. the information furnished by abracon is believed to be accurate and reliable. however, abracon makes no guarantee or warranty concerning the a ccuracy of said information and shall not be responsible for any loss or damage of whatever nature resulting from the use of, or reliance upon this product. life support policy : abracon ?s products are not authorized for use as critical components in life support devices or systems without the express written approval of the president of abracon corporation. for part ordering, please contact our sales department: 30332 esperanza., rancho santa margarita, ca 92688 ph: 949-546-8000 fax: 949-546-8001 part number the order number for this device is a combination of the following: device number, package type and operating temperature range abx803x x c l t order number marking marking abx8037oc abx8037oc tssop - tube abx8037oc-t abx8037oc tssop - tape & reel abx8037ocl abx8037ocl tssop - tube (green package) abx8037ocl-t abx8037ocl tssop - tape & reel (green package) abx8037qc x8037qc qfn - tube abx8037qc-t x8037qc qfn - tape & reel abx8037qcl x8037qcl qfn - tube (green package) abx8037qcl-t x8037qcl qfn - tape & reel (green package) abx8038oc abx8038oc tssop - tube abx8038oc-t abx8038oc tssop - tape & reel abx8038ocl abx8038ocl tssop - tube (green package) abx8038ocl-t abx8038ocl tssop - tape & reel (green package) abx8038qc x8038qc qfn - tube abx8038qc-t x8038qc qfn - tape & reel abx8038qcl x8038qcl qfn - tube (green package) abx8038qcl-t x8038qcl qfn - tape & reel (green package) abx8039oc abx8039oc tssop - tube abx8039oc-t abx8039oc tssop - tape & reel abx8039ocl abx8039ocl tssop - tube (green package) abx8039ocl-t abx8039ocl tssop - tape & reel (green package) abx8039qc x8039qc qfn - tube abx8039qc-t x8039qc qfn - tape & reel abX8039QCL X8039QCL qfn - tube (green package) abX8039QCL-t X8039QCL qfn - tape & reel (green package) temperature c=commercial i=industral package type o=tssop q= qfn 4x4 l= green package none= regular package t= tape & reel none= tube part number
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