ABX0235/37/38/39 750khz ? 800mhz low phase noise multiplier xo universal low phase noise ic?s 30332 esperanza., rancho santa margarita, ca 92688 ph: 949-546-8000 fax: 949-546-8001 www.abracon.com 03/21/05 page 1 features ? selectable 750khz to 800mhz range. ? low phase noise output (@ 10khz frequency offset, -140dbc/hz for 19.44mhz, -127dbc/hz for 106.25mhz, -125dbc/hz for 155.52mhz, - 110dbc/hz for 622.08mhz). ? cmos (abx0237), pecl (ABX0235 and abx0238) or lvds (abx0239) output. ? 12 to 25mhz crystal input. ? no external load capacitor required. ? output enable selector. ? selectable 1/16 to 32x frequency multiplier. ? 3.3v operation. ? available in 16-pin (tssop or 3x3mm qfn). description the ABX0235 (pecl with inverted oe), abx0237 (cmos), abx0238 (pecl), and abx0239 (lvds) are high performance and low phase noise xo ic chips. they provide phase noise performance as low as ?125dbc at 1khz offset (at 155mhz) and a typical rms jitter of 4ps rms ( at 155mhz ). they accept fundamental parallel resonant mode crystals from 12 to 25mhz. block diagram pin configuration (top view) ^: internal pull-up *: on 3x3 package, ABX0235/38 do not have sel0 available: pin 10 is vdd, pin 11 is gnd. however, abx0237/39 have sel0 (pin 10), and pin 11 is vdd. see pin assignment table for details. output enable l ogical levels part # oe state 0 (default) output enabled abx0238 1 tri-state 0 tri-state ABX0235 abx0237 abx0239 1 (default) output enabled oe input: logical states defined by pecl levels for abx0238 logical states defined by cmos levels for ABX0235/37/39 abx023x 1 2 3 4 5 6 7 8 vdd 9 10 11 12 13 14 15 16 xin xout sel3^ sel2^ oe gnd gnd sel0^ sel1^ gnd clkc vdd clkt gnd gnd abx023x gnd vdd clkt clkc 1234 12 11 10 9 13 14 15 16 8 7 6 5 xin sel0^ / vdd* sel1^ vdd / gnd* sel3^ xout sel2^ oe gnd gnd gnd gnd xin xout oe q q pll by-pass sel pll (phase locked loop) oscillator amplifier
ABX0235/37/38/39 750khz ? 800mhz low phase noise multiplier xo universal low phase noise ic?s 30332 esperanza., rancho santa margarita, ca 92688 ph: 949-546-8000 fax: 949-546-8001 www.abracon.com 03/21/05 page 2 frequency selection table sel3 sel2 sel1 sel0 selected multiplier 0 0 1 1 fin x 32 0 1 1 0 fin / 8 0 1 1 1 fin x 2 1 0 0 1 fin / 2 1 0 1 0 fin / 16 1 0 1 1 fin x 4 1 1 0 0 fin / 4 1 1 0 1 fin x 8 1 1 1 0 fin x 16 1 1 1 1 no multiplication note: sel0 is not available (always ?1?) for ABX0235 and abx0238 in 3x3mm package pin descriptions ABX0235 and abx0238 (see next page of abx0237/39) name tssop pin number 3x3mm qfn pin number type description xin 2 12 i crystal input. see crystal specifications on page 3. xout 3 13 i crystal output. see cr ystal specifications on page 3. oe 6 16 i output enable pin (see oe logic state table on page 1). gnd 7,8,9,10,14 1,2,3,4,8,11 p ground. clkt 11 5 o true output pecl clkc 13 7 o complementary output pecl. sel0 16 not available i sel1 15 9 i sel2 5 15 i sel3 4 14 i multiplier selector pins. these pins have an internal pull-up that will default sel to ?1? when not connected to gnd. vdd 1, 12 6,10 p power supply.
ABX0235/37/38/39 750khz ? 800mhz low phase noise multiplier xo universal low phase noise ic?s 30332 esperanza., rancho santa margarita, ca 92688 ph: 949-546-8000 fax: 949-546-8001 www.abracon.com 03/21/05 page 3 pin descriptions abx0237/39 (see previous page of ABX0235/38) name tssop pin number 3x3mm qfn pin number type description xin 2 12 i crystal input. see crystal specifications on page 3. xout 3 13 i crystal output. see cr ystal specifications on page 3. oe 6 16 i output enable pin (see oe logic state table on page 1). gnd 7,8,9,10,14 1,2,3,4,8 p ground. clkt 11 5 o true output lvds (abx0239) (n/c for abx0237) clkc 13 7 o complementary output lvds (abx0239) (cmos out for abx0237). sel0 16 10 i sel1 15 9 i sel2 5 15 i sel3 4 14 i multiplier selector pins. these pins have an internal pull-up that will default sel to ?1? when not connected to gnd. vdd 1, 12 6,11 p power supply. 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 con- ditions above the operational limits noted in this specification 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 12 25 mhz crystal loading rating c l (xtal) 20 pf recommended esr r e at cut 30 ?
ABX0235/37/38/39 750khz ? 800mhz low phase noise multiplier xo universal low phase noise ic?s 30332 esperanza., rancho santa margarita, ca 92688 ph: 949-546-8000 fax: 949-546-8001 www.abracon.com 03/21/05 page 4 3. general electrical specifications parameters symbol conditions min. typ. max. units fout<24mhz 25/25/15 24mhz ABX0235/37/38/39 750khz ? 800mhz low phase noise multiplier xo universal low phase noise ic?s 30332 esperanza., rancho santa margarita, ca 92688 ph: 949-546-8000 fax: 949-546-8001 www.abracon.com 03/21/05 page 5 7. 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 8. 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
ABX0235/37/38/39 750khz ? 800mhz low phase noise multiplier xo universal low phase noise ic?s 30332 esperanza., rancho santa margarita, ca 92688 ph: 949-546-8000 fax: 949-546-8001 www.abracon.com 03/21/05 page 6 9. 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 10. pecl switching characteristics parameters symbol conditions min. typ. max. units clock rise time t r 0.8v ~ 2.0v 1.5 ns clock fall time t f 2.0v ~ 0.8v 1.5 ns duty cycle measured @ 1.4v 40 50 60 % 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
ABX0235/37/38/39 750khz ? 800mhz low phase noise multiplier xo universal low phase noise ic?s 30332 esperanza., rancho santa margarita, ca 92688 ph: 949-546-8000 fax: 949-546-8001 www.abracon.com 03/21/05 page 7 package information 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 3x3mm qfn
ABX0235/37/38/39 750khz ? 800mhz low phase noise multiplier xo universal low phase noise ic?s 30332 esperanza., rancho santa margarita, ca 92688 ph: 949-546-8000 fax: 949-546-8001 www.abracon.com 03/21/05 page 8 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 fur- nished by abracon is believed to be accurate and reliable. ho wever, abracon makes no guarantee or warranty concerning the accu racy of said infor- mation and shall not be responsible for any loss or damage of wh atever nature resulting from the use of, or reliance upon this product. life support policy : abracon?s products are not authorized for use as critical comp onents 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 abx023x o c order number marking package option ABX0235oc-t ABX0235oc tssop - tape and reel ABX0235oc ABX0235oc tssop ? tube ABX0235qc- t ABX0235qc qfn - tape and reel ABX0235qc ABX0235qc qfn ? tube abx0237oc-t abx0237oc tssop - tape and reel abx0237oc abx0237oc tssop ? tube abx0237qc- t abx0237qc qfn - tape and reel abx0237qc abx0237qc qfn ? tube abx0238oc-t abx0238oc tssop - tape and reel abx0238oc abx0238oc tssop ? tube abx0238qc- t abx0238qc qfn - tape and reel abx0238qc abx0238qc qfn ? tube abx0239oc-t abx0239oc tssop - tape and reel abx0239oc abx0239oc tssop ? tube abx0239qc- t abx0239qc qfn - tape and reel abx0239qc abx0239qc qfn - tube part number temperature c=commercial i=industral package type o=tssop q=qfn
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