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pl904 xxx revision 1.0 micrel inc. ? 2180 fortune drive ? san jose, ca 95131 ? usa ? tel +1 (408) 944 - 0800 ? fax + 1 (408) 474 - 1000 ? http://www.micrel.com september 11 , 20 15 revision 1.0 tcghelp@micrel.com or (408) 955 - 1690 general description the pl904xxx series is a small form - factor, high performance, programmable device and a member of micrel?s jitterblocker factory programmable jitter attenuators. the jitterblocker product family cleans deterministic jitter by attenuatin g spurious components in the phase noise, thereby improving the phase jitter and the overall phase noise. the pl904xxx is capable of reducing multiple pico seconds of phase jitter in a clock to a level below 0.5ps rms in most cases, making that clock usable for many more applications. the pl904xxx operates on a single 2.5v or 3.3v supply and is housed in a small qfn package for a broad range of applications. input clock frequencies up to 250mhz can be filtered and frequency translation allows for output clo ck frequencies up to 850mhz. the input clock can be single - ended or differential. datasheets and support documentation are available on micrel?s web site at : www.micrel.com . block diagram features ? input frequency up to 250mhz ? output frequency up to 850 mhz ? programmable input type, differential or single - ended ? up to two outputs with lvpecl, lvds, hcsl, or lvcmos logic types ? output enable control for each output ? jitter attenuation of 20db at 3mhz spur frequency ? cleans u p spurs to below 0.5ps rms phase jitter ? operating temperature range from ? 40 c to 85 c ? available in 32- pin qfn green /rohs - compliant package ? related devices: ? pl902: lvcmos, period jitter cleaning ? pl903: single ended input, one differential output, phase nois e cleaning applications ? 1/10/40/100 gigabit ethernet (gbe) ? sonet/sdh ? pci express ? cpri/obsai wireless base stations ? fibre channel ? sas/sata ? dimm
micrel, inc. pl904 xxx september 11, 2015 2 revision 1.0 tcghelp@micrel.com or (40 8) 955 - 1690 ordering information part number marking shipping ambient temp. range package lead finish pl904 xxx umg pl904 xxx tray ? 40 to +85c qfn -32l nipdau pl904 xxx umg tr pl904 xxx tape and reel ? 40 to +85c qfn -32l nipdau pin configuration 32- pin qfn (5 mm 5 mm)
micrel, inc. pl904 xxx september 11, 2015 3 revision 1.0 tcghelp@micrel.com or (40 8) 955 - 1690 pin description pin number pin name pin type pin level pin function 1 8 , 1 9 22, 23 out b, / outb out a, / o ut a o various clock outputs. can be programmed to one of the following logic types: ( 1 ) lvpecl, lvds, hcsl, or lvcmos. 2 6 , 2 7 refin, /refin i various reference clock input. can be programmed to either differenti al or single - ended use. 20 16 oe_a oe_b i cmos output enable, outputs disable to tri - state, 0 = disabled, 1 = enabled, on- ch ip 75k? pull -up 1, 2, 5, 8, 25 vdd pwr core power supply. 28 vddi pwr input circuit power supply, +3.3v only. 24 vdda pwr analog circuit power supply. 21 17 vddoa vddob pwr output buffers power supply. epad vss pwr power supply ground and thermal relief. ( 2 ) 11 gnd i this pin is not power supply ground, but must be tied to vss for proper operation. 3, 4, 6, 7, 9, 10, 12, 13, 14, 15, 29, 30, 31, 32 dnc internally connected. do not connect anything to these pins. note: 1. in case of lvcmos, only the true output pin is enabled. the complementary output pin is disabled to a high impedance. 2. exposed package pad is electrically active and must be connected to ground.
micrel, inc. pl904 xxx september 11, 2015 4 revision 1.0 tcghelp@micrel.com or (40 8) 955 - 1690 functional description the pl904 xxx seri es is a very flexible, advanced programmable jitter filter design for high performance, s mall form - factor applications. the pl904 xxx accepts a reference clock input between 12mhz and 250mhz that can be eithe r differential or single - ended. the pl904 xxx is c apable of producing up to 2 differential outputs up to 850mhz. the most common configuration will be with the same input and output frequency , but this flexible design also allows frequency translation from one frequency to another frequency, as long as bo th frequencies are within the specified ranges for input and output. jitter attenuation typically, the jitter attenuation settings will be optimized for one particular input and output frequency. the pl904xxx excels at attenuating deterministic jitter that presents itself as spurs in the phase noise plot above 1mhz. output logic programming available output logic types are lvpecl, lvds, hcsl, and lvcmos. each output can be programmed individually to one of the four logic types. all logic types are differe ntial , except lvcmos. for lvcmos, only the true channel of the output pair is enabled and the complementary channel is disabled. with lvcmos , there is also an output drive setting. there is one setting for all lvcmos outputs, so all lvcmos outputs will hav e the same drive strength. unused outputs are disabled to high impedance. input selection the reference input for the device can be programmed to be either differential or single ended and requires only a small amplitude. see figure 1 and figure 2 . the single - ended signal can be lvcmos and the differential signal can be any of the differential logic types. for the differential logic types , it is important to use the appropri ate termination for the logic type. figure 1 . differential input signal figure 2 . single - ended input signal
micrel, inc. pl904 xxx september 11, 2015 5 revision 1.0 tcghelp@micrel.com or (40 8) 955 - 1690 absolute maximum ratings ( 3 ) supply voltage ( v dd , v ddi , v dda , v ddoa/ b ) .................... + 4.6 v input voltage (v in ) ................................ ? 0.5v to v dd + 0.5v lead temperature (soldering, 2 0 s) ............................ 260c case temperature ..................................................... 115c storage temperature (t s ) ......................... ? 65c to +150 c operating ratings ( 4 ) supply v oltage ( v dd , v dda , v ddoa/b , v ddi ) ....................... +2.375v to +3.465 v ambient temperature (t a ) .......................... ? 40c to +85c junction thermal resistance (5) ( ja ), still - air ...................................................... 34 c/w dc electrical characteristics ( 6 ) v dd , v dda , v dd oa/b , v ddi = 2.375v ~ 3.465v ; t a = ? 40c to +85c. symbol parameter condition min . typ . max . units v dd v dda v dd oa/b power supply volta ge 2.375 3.465 v v ddi power supply voltage 3.135 3.465 v i dd total supply current, v dd + v ddo 2 lvpecl, 156.25mhz outputs open 220 m a 2 hcsl (pcie), 100mhz outputs terminated with 50 ? to v ss 230 ma 2 lvcmos, 125mhz outputs open 210 ma refin dc electrical characteristics ( 6 ) v ddi = 3.135v ~ 3.465v ; t a = ? 40c to +85c. symbol parameter condition min . typ . max . units v cmr input common mode voltage 0.3 v ddi ? 0.3 v v swing input voltage s wing peak to peak. each side of the differential input. 0.2 v ddi v pp notes: 3. exceeding the absolute maximum ratings may damage the device. 4. the device is not guaranteed to function outside its operating ratings. 5. package thermal resistance assumes the expos ed pad is soldered (or equivalent) to the device?s most negative potential on the pcb. 6. the circuit is designed to meet the ac and dc specifications shown in the electrical characteristics tables after thermal equ ilibrium has been established.
micrel, inc. pl904 xxx september 11, 2015 6 revision 1.0 tcghelp@micrel.com or (40 8) 955 - 1690 lvds output dc electrical characteristics ( 6 ) v ddoa/b = 2.375v ~ 3.465v , t a = ? 40c to +85c, r l = 100 across q and /q. symbol parameter condition min . typ . max . units v od differential output voltage 2 4 5 350 454 mv v cm common mode v oltage 1.125 1.2 1.375 v v oh output high v oltage 1.248 1.375 1.602 v v ol output low v oltage 0.898 1.025 1.252 v hcsl output dc electrical characteristics ( 6 ) v ddoa/b = 2.375v ~ 3.465v , t a = 40 c to +85 c, r l = 50 to v ss symbol parameter condition min . typ . max . units v oh output high v oltage 660 700 850 m v v ol outpu t low v oltage 150 0 27 m v v cross crossing p oint v oltage 350 m v lvpecl output dc electrical characteristics ( 6 ) v ddoa/b = 2.375v ~ 3.465v , t a = 40 c to +85 c, r l = 50 to v dd 2v symbol parameter conditi on min . typ . max . units v oh output high v oltage v ddo ? 1.35 v ddo ? 1 . 01 v ddo ? 0.8 0 v v ol output low v oltage v ddo ? 2.00 v ddo ? 1.7 8 v ddo ? 1.6 0 v v swing output voltage s wing 0.6 5 0.77 0.95 v lvcmos output dc electrical characteristics ( 6 ) v ddoa/b = 2.375v ~ 3.465v , t a = 40 c to +85 c, r l = 50 to v dd /2 symbol parameter condition min . typ . max . units v oh output high v oltage v dd ? 0.8 v v ol output low v oltage 0.5 v oe (lvcmos) input dc electrical characteristics ( 6 ) v dd , v dda , v ddoa/b = 2.375 v ~ 3.465v; v ddi = 3.135v ~ 3.465v , t a = 40 c to +85 c symbol parameter condition min . typ . max . units v ih input high v oltage v dd 0.7 v dd + 0.3 v v il input low v oltage v ss 0.3 0.3 v dd v i ih input h igh c urrent v dd = v in = 3.465v 5 a i il i nput low c urrent v dd = 3.465v, v in = 0v 150 a
micrel, inc. pl904 xxx september 11, 2015 7 revision 1.0 tcghelp@micrel.com or (40 8) 955 - 1690 ac electrical characteristics v dd , v dda , v ddoa/b , v ddi = 2.375v ~ 3.465v; t a = ? 40c to +85c. symbol parameter condition min. typ. max. units f in input f requency 12 2 50 mhz f out output f requency lvp ecl, lvds, hcsl 12 850 mhz lvcmos 12 250 mhz t r /t f output rise/fall t ime see figure 4 lvpecl output 85 135 350 ps lvds output 85 140 300 ps hcsl output 175 340 700 ps lvcmos output (default drive) 100 200 400 ps odc output duty c ycle see figure 3 all output frequencies 45 50 55 % < 350mhz output frequencies 48 50 52 % t lock pll lock t ime 5 20 m s
micrel, inc. pl904 xxx september 11, 2015 8 revision 1.0 tcghelp@micrel.com or (40 8) 955 - 1690 power supply filtering recommendations preferred filter, using micrel?s mic94300 or mic94310 ripple blocker ?: alternative, traditional filter, using a ferrite bead: vddo and vdd pins can be connected directly to the vdd power plane. for vdda and vddi it is recommended to use a power supply filter as descr ibed above. application information power supply decoupling place the smallest value decoupling capacitor (4.7nf above) between the vdd and vss pins, as close as possible to those pins and on the same side of the pcb as the ic. the shorter the physical p ath from vdd to the capacitor and back from the capacitor to vss, the more effective the decoupling. use one 4.7nf capacitor for each vdd pin on the pl904xxx. the impedance value of the ferrite bead (fb) needs to be between 240 and 600 with a saturation current 150ma. vddo pins connect directly to the vdd plane. all vdd pins on the pl904xxx connect to vdd after the power supply filter. a ripple blocker has advantages over using a ferrite bead. a ripple blocker filters much lower frequencies than a ferrit e bead, at least two decades lower. most ferrite beads cause peaking in the noise filter frequency response, so some noise frequencies are actually made worse. the ripple blocker is designed to not have any noise peaking. output traces design the traces f or the output signals according to the output logic req uirements. if lvcmos is unterminated, add a 30 resistor in series with the output, as close as possible to the output pin, and start a 50 trace on the other side of the resistor. for differential traces, you can either use a differential design or two se parate 50 traces. for emi reasons, it is better to use a differential design. lvds can be ac - coupled or dc - coupled to its termination.
micrel, inc. pl904 xxx september 11, 2015 9 revision 1.0 tcghelp@micrel.com or (40 8) 955 - 1690 figure 3 . duty cycle timing figure 4 . all outputs rise/fall t ime figure 5 . rms phase noise jitter figure 6 . lvpecl output load and test circuit
micrel, inc. pl904 xxx september 11, 2015 10 revision 1.0 tcghelp@micrel.com or (40 8) 955 - 1690 figure 7 . hcsl output load and test circuit figure 8 . lvds o utput load and test circuit figure 9 . lvcmos output load and test circuit
micrel, inc. pl904 xxx september 11, 2015 11 revision 1.0 tcghelp@micrel.com or (40 8) 955 - 1690 jitter attenuation performance the jitter attenuating frequency response was measured at 156.25mhz . -30 -20 -10 0 10 1.e+03 1.e+04 1.e+05 1.e+06 jitter attenuation (db) jitter / modulation frequency (hz) the jitter attenuation works like a low - pass filte r for frequency modulated signals or noise. the bandwidth for this low - pass filter is 500k hz wit h a 12db/octave slope above 500k hz. at about 5mhz the noise floor of this measurement is reached but in reality, the attenuation continues with the 12db/octave slope.
micrel, inc. pl904 xxx september 11, 2015 12 revision 1.0 tcghelp@micrel.com or (40 8) 955 - 1690 phase noise performance with a clean input clock. 156.25mhz with 55fs rms of phase jitter for 1.875mhz to 20mhz integration range 156.25mhz with 226fs rms of phase jitter for 12khz to 20mhz integration range
micrel, inc. pl904 xxx september 11, 2015 13 revision 1.0 tcghelp@micrel.com or (40 8) 955 - 1690 example 156.25mhz input test clock w ith bad phase jitter cause by a 3mhz spur. 156.25mhz with 1.4ps rms of phase jitter for 12khz to 20mhz integration range output clock from pl904xxx. 156.25mhz with 273fs rms of phase jitter for 12khz to 20mhz integration range the 3mhz spur is attenuat ed by 20db, resulting in a phase jitter reduction from 1.4ps to 0.27ps.
micrel, inc. pl904 xxx september 11, 2015 14 revision 1.0 tcghelp@micrel.com or (40 8) 955 - 1690 package information and recommended landing pattern ( 7 ) 32- pin qfn note: 7. package information is correct as of the publication date. for updates and most current information, go to www.micrel.com .
micrel, inc. pl904 xxx september 11, 2015 15 revision 1.0 tcghelp@micrel.com or (40 8) 955 - 1690 micrel, inc. 2180 fortune drive san jose, ca 95131 usa tel +1 (408) 944 - 0800 fax +1 (408) 474 - 100 0 web http://www.micrel.com micrel, inc. is a leading global manufacturer of ic solutions for the worldwide high performance linear and power, lan, and t iming & communications markets. the company?s products include advanced mixed - signal, analog & power semiconductors; high - performance communication, clock management, mems - based clock oscillators & crystal - less clock generators, ethernet switches, and physical layer transceiver ics. company customers include leading manufacturers of enterprise, consumer, industrial, mobile, telecommunications, automotive, and computer products. corporation headquarters and state - of - the - art wafer fabrication facilities are located in san jose, ca, with regional sales and support offic es and advanced technology design centers situated throughout the americas, europe, and asia. additionally, the company maintains a n extensive network of distributors and reps worldwide. micrel makes no representations or warranties with respect to the a ccuracy or completeness of the information furnished in this datasheet. this information is not intended as a warranty and micrel does not assume responsibility for its use. micrel reserves the right t o change circuitry, specifications and descriptions at any time without notice. no license, whether express, implied, arising by estoppel or otherwise, to any intellectual property rights is granted by this document. except as provided in micrel?s terms and conditions of sale for such products, m icrel assume s no liability whatsoever, and micrel disclaims any express or implied warranty relating to the sale and/or use of micrel products including liability or warranties relating to fitness for a particular purpose, merchantability, or infringement of any paten t, copyright, or other intellectual property right. micrel products are not designed or authorized for use as components in life support appliances, devices or systems where mal function of a product can reasonably be expected to result in personal injury. life support devices or systems are devices or systems that (a) are intended for surgical implant into the body or (b) support or sustain life, and whose failure to perform can be reasonably expected to result in a signific ant injury to the user. a purcha ser?s use or sale of micrel products for use in life support appliances, devices or systems is a purchaser?s own risk and pur chaser agrees to fully indemnify micrel for any damages resulting from such use or sale. ? 20 1 5 micrel, incorporated.

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