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data sheet, v1.0, aug. 1999 never stop thinking. foa3251b1 high speed clock and data recovery for fiber optic applications ics for communications
edition 1999-08 published by infineon technologies ag, st.-martin-strasse 53, 81669 mnchen, germany ? infineon technologies ag 2002. all rights reserved. attention please! the information herein is given to describe certain components and shall not be considered as warranted characteristics. terms of delivery and rights to technical change reserved. we hereby disclaim any and all warranties, including but not limited to warranties of non-infringement, regarding circuits, descriptions and charts stated herein. infineon technologies is an approved cecc manufacturer. information for further information on technology, delivery terms and conditions and prices please contact your nearest infineon technologies office in germany or our infineon technologies representatives worldwide. warnings due to technical requirements components may contain dangerous substances. for information on the types in question please contact your nearest infineon technologies office. infineon technologies components may only be used in life-support devices or systems with the express written approval of infineon technologies, if a failure of such components can reasonably be expected to cause the failure of that life-support device or system, or to affect the safety or effectiveness of that device or system. life-support devices or systems are intended to be implanted in the human body, or to support and/or maintain and sustain and/or protect human life. if they fail, it is reasonable to assume that the health of the user or other persons may be endangered. for questions on technology, delivery and prices please contact the infineon technologies offices in germany or the infineon technologies companies and representatives worldwide: see our webpage at http://www.infineon.com. abm ? , aop ? , arcofi ? , arcofi ? -ba, arcofi ? -sp, digitape ? , epic ? -1, epic ? -s, elic ? , falc ? 54, falc ? 56, falc ? -e1, falc ? -lh, idec ? , iom ? , iom ? -1, iom ? -2, ipat ? -2, isac ? -p, isac ? -s, isac ? -s te, isac ? -p te, itac ? , iwe ? , musac ? -a, octat ? -p, quat ? -s, sicat ? , sicofi ? , sicofi ? -2, sicofi ? -4, sicofi ? -4c, slicofi ? are registered trademarks of infineon technologies ag. ace?, asm?, asp?, potswire?, quadfalc?, scout? are trademarks of infineon technologies ag. foa3251b1 S1028C1 revision history: 1999-08 v1.0 previous version: page subjects (major changes since last revision) document?s layout has been changed: 2002-sep.
foa3251b1 S1028C1 data sheet 3 v1.0, 1999-08 preface the transceiver ic foa3251 is designed for fibre optic application in the data bit range of 2.5 gbit. the foa3251 fulfills the jitter requirements specified in itu g958 and bellcore gr253. organization of this document this data sheet is divided into 8 chapters. it is organized as follows: chapter 1, overview gives a general description of the product , lists the key features, and presents some typical applications. chapter 2, functional description lists pin locations with associated signals, categorizes signals according to function, and describes signals. blockdiagram and block description. chapter 3, operational description chapter 4, electrical characteristics dc and ac characteristics, power consumption, interface specification. chapter 5, external components application notes and recommended suppliers chapter 6, measurement results chapter 7, package outlines
foa3251b1 S1028C1 table of contents page data sheet 4 v1.0, 1999-08 1 overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 1.1 features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 1.2 applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 2 functional description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 2.1 pin configuration (top view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 2.2 pin definition and function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 2.3 functional block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 2.4 functional block description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 3 operational description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 3.1 operating states of delay line . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 4 electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 4.1 absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 4.2 operating range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 4.3 dc characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 4.4 ac characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 5 external components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 6 measurement results . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 7 package outlines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
data sheet 5 v1.0, 1999-08 high speed clock and data recovery for fiber optic applications foa3251b1 S1028C1 bipolar p-l q fp-4 8 -1 p-lqfp-48-1 type ordering code package foa3251b1 p-lqfp-48-1 1 overview the transceiver ic foa3251 is designed for fibre optic application in the data bit range of 2.5 gbit. the foa3251 fulfills the jitter requirements specified in itu g958 and bellcore gr253. 1.1 features data rate up to 2.633 gb/s all jitter data meet itu-t g958 and gr-253-core requirements supply range from +3.0 v to 5.0 v supply current < 210 ma input sensitivity < 5 mvpp differential (ber = 10 -12 ) loss of signal (los) detection programmable delay element to adjust clock- to data output lock indication 1.2 applications fibre optic communication systems sdh / sonet / atm applications
foa3251b1 S1028C1 functional description data sheet 6 v1.0, 1999-08 2 functional description the foa3251 consists of a clock and data recovery block (cdr), a clock multiplier unit (cmu) and a programmable delay line. 2.1 pin configuration (top view) figure 1 pin configuration v cc itp11416 testclk v ee v cc delay0 v cc alarm lol los reset xtal in xtal out v cc v cc delay1 delay2 n2v5 llos p-lqfp-48-1 data in v cc data in v cc v cc pll1 up pll1 dn test v cc testlos v cc v cc v cc v cc pll2 dn pll2 up v cclc v e elc v cc v cc clk tr clk tr v cc data tr data tr v cc v cc v ee v ee 112 36 25 13 24 48 37 38 39 40 41 42 43 44 45 46 47 234567891011 14 15 16 17 18 19 20 21 22 23 26 27 28 29 30 31 32 33 34 35 v f02 v f01
foa3251b1 S1028C1 functional description data sheet 7 v1.0, 1999-08 2.2 pin definition and function 7 table 1 pin definition and function pin symbol input (i) output (o) function 1 testclk in clock signal for test mode only 2testlosin 3 v cc 4 v cc can be open. 5 v cc can be open. 6 v cc 7 v cc in can be open. 8 pll2 dn out inverted down signal from pll2 9 pll2 up out inverted up signal from pll2 10 v f02 in control voltage for vco2 11 v cclc v cc v co2 12 v eelc v ee v co2 13 v ee 14 v ee 15 v cc 16 v cc 17 data tr out inverted recovered data signal 18 data tr out recovered data signal 19 v cc 20 clk tr out recovered clock signal 21 clk tr out inverted recovered clock signal 22 v cc 23 v cc 24 v cc 25 delay0 in delay select bit 0. (see table 2 ) 26 delay1 in delay select bit 1. (see table 2 ) 27 delay2 in delay select bit 2. (see table 2 ) 28 v cc
foa3251b1 S1028C1 functional description data sheet 8 v1.0, 1999-08 29 v cc 30 xtal out out crystal 31 xtal in in crystal 32 reset in reset for test mode only 33 los out loss of signal (esd only to v ee ) 34 lol out loss of lock 35 v cc alarm v cc alarm supply. max. 5 v, min 0 v = v cc (no esd) 36 v ee 37 llos in adjustment for level los 38 n2v5 in negative supply voltage for v co1 39 v cc 40 data in in inverted data input (no esd) 41 v cc 42 data in in data input (no esd) 43 v cc 44 v f01 in control voltage v co1 45 v cc 46 pll1 up inverted up signal pll1 47 pll1 dn inverted down signal pll1 48 test in test mode on/off table 1 pin definition and function (cont?d) pin symbol input (i) output (o) function
foa3251b1 S1028C1 functional description data sheet 9 v1.0, 1999-08 2.3 functional block diagram figure 2 block diagram 2.4 functional block description the clock and data recovery block (cdr) consists of a bang-bang phase detector (pd), a frequency window detector (fwd) and a vco. the pd also provides a kind of statistical ber signal that is used to generate a loss of signal (los) signal. the fwd moves the vco in the right frequency range. the frequency window is about 10000 ppm of the center frequency. when the frequency is out of range a los of lock signal (lol) is generated. the center frequency is given by a reference clock signal which is (signal frequency)/128. the vco is a 3 stage ring oscillator type. the clock multiplier unit (cmu) consist of a phase frequency detector (pfd), a vco and a retiming flip-flop. the pfd is type 4 phase and frequency detector. the low pass filtered pfd signal as a function of the phase error is shown in figure 3 . itb11417 fwd vco pd loop filter cdr d c pfd loop filter vco cmu delay line data refclk trdata trclk recovered data recovered clock los lol postamp
foa3251b1 S1028C1 functional description data sheet 10 v1.0, 1999-08 figure 3 pfd characteristic the vco is a lc type with a center frequency of 2.5 ghz. the measured tuning range is shown in figure 4 . figure 4 tuning range lc vco the delay line is programmable in 8 steps of about 50 ps. the clock signal is adjustable over 1 period (400 as) and can be easily adapted to different applications. itd11418 v pfd e -4 -2 2 4 k d 2 - k d 2 itd11419 0 2 tuning voltage ghz -1 -2 -3 frequency v m25 center freq. [ghz] 85 center freq. [ghz] 20 center freq. [ghz] 2.2 2.4 2.6 2.8 3
foa3251b1 S1028C1 operational description data sheet 11 v1.0, 1999-08 3 operational description 3.1 operating states of delay line for clock to data output adjustment a adjustable delay line is available. the clock output signal is adjustable by the signals delay0..2. table 2 truth table delay line delay0 delay1 delay2 delta low low low 0 ps low high low 50 ps low low high 100 ps low high high 150 ps high low low 200 ps high high low 250 ps high low high 300 ps high high high 350 ps
foa3251b1 S1028C1 electrical characteristics data sheet 12 v1.0, 1999-08 4 electrical characteristics 4.1 absolute maximum ratings the rf pin 40, 42 are not esd protected. the high frequency performance prohibits the use of a adequate protective structure. pin 33 is only protected to v ee . 4.2 operating range table 3 absolute maximum ratings parameter symbol limit values unit min. max. ic supply voltage ( v cc - v ee )6v voltage on any pin v s -0.4 v ddp + 0.4 maximum junction temperature 125 c storage temperature t stg -40 150 protection supply voltage v ddp v ee - 0.5 v cc v esd robustness hbm: 1.5 k ? , 100 pf v esd,hbm 500 lead temperature range package table 4 operating range parameter symbol limit values unit min. max. ambient temperature t a -40 85 c supply voltage v dd 3.0 5 v
foa3251b1 S1028C1 electrical characteristics data sheet 13 v1.0, 1999-08 4.3 dc characteristics 4.4 ac characteristics table 5 dc characteristics parameter symbol limit values unit min. max. control and test inputs v il v ih v cc - 1 v cc v output current cml pin 17, 18, 20, 21 i oc 80.45ma supply current i ee (av) 200 tbd ma table 6 electrical characteristics parameter condition limit values unit min. typ. max. quantisizer dc characteristics 1) pin or nin v ee +2.5 v cc v input voltage range 2) pin-nin, ber < 10 -12 10 mv input sensitivity, v sense pin-nin, ber < 10 -12 v input overdrive, v od 2mv input offset voltage 10 a input current input rms noise ber < 10 -12 tbd v input pk-pk noise ber < 10 -12 tbd quantisizer ac characteristics 2.5 ghz upper -3 db bandwidth extern) 50 ? input resistance package 0.8 pf input capacitance pulse width distortion vswr 2.5
foa3251b1 S1028C1 electrical characteristics data sheet 14 v1.0, 1999-08 level detect response time ac coupled 95 s hysteresis (electrical) 3) 13db alm output logic high 4) v cc alarm = 5 v 4.5 v alm output logic low v ee alarm = gnd 1 alm output logic high v cc alarm = gnd -0.5 alm output logic low v ee alarm = -5 v -4 phase-locked loop nominal center frequency f 0 2.48832 ghz capture range 5) -0.2% x f 0 +0.2% x f 0 ghz tracking range -0.2% x f 0 +0.2% x f 0 static phase error 6) -3.6 +3.6 deg. phase drift 7) 100 bit jitter sonet sts-48 frame (with scrambler 2e7-1) and 2e23-1 prn sequence itu-t g958 and gr-253-core objective < 0.005 uirms (2ps) jitter tolerance sonet sts-48 frame (with scrambler 2e7-1) and 2e23-1 prn sequence itu-t g958 and gr-253-core jitter transfer sonet sts-48 frame (with scrambler 2e7-1) and 2e23-1 prn sequence itu-t g958 and gr-253-core open collector output referenced to v cc voltage levels output logic high, v oh 0v output logic low, v ol 400 v symmetry (duty cycle) recovered clock output 46 54 table 6 electrical characteristics (cont?d) parameter condition limit values unit min. typ. max.
foa3251b1 S1028C1 electrical characteristics data sheet 15 v1.0, 1999-08 output rise/fall times clock output rise time 20% - 80%, 50 ? 100 ps fall time 20% - 80%, 50 ? 100 ps data output rise time 20% - 80%, 50 ? 120 ps fall time 20% - 80%, 50 ? 120 ps control and test inputs 8) referenced to v cc input logic high, v ih 0v input logic low, v il -1 v control and test outputs referenced to v cc output logic high, v ih 0v output logic low, v il -1 v power supply voltage 3 5 5.8 v power supply current 9) 210 ma operating temperature package ambient -40 +85 c bare chip ambient -40 +100 c bare chip size < 3.0 mm x 3.0 mm 1) min value pin, nin: v cc -pin, nin < 800 mv 2) voltage (pin-nin) = 4 mvpp @pin = -23 dbm 3) hysteresis can be installed by a combination of signal los and llos. 4) open collector output type, i = 2 ma. datarate depends on output load. termination with pullup resistor > 4.7 k ? 5) no skipping clock cycles allowed down to < 10 -3 ber external adjustable. 6) clock drift with no input 25 mhz 7) the alarm shall be asserted before 500 ns of phase shift on the rx clock is realized. 8) consecutive identical bits 72 bits. 9) supply current = i ee ( current without ecl output current). table 6 electrical characteristics (cont?d) parameter condition limit values unit min. typ. max.
foa3251b1 S1028C1 external components data sheet 16 v1.0, 1999-08 5 external components figure 5 external components required for operation of foa3251b1 the external circuits are shown in figure 6 , figure 7 , figure 8 and figure 9 . table 7 external devices device number recommended types remark reference voltage 1 - 2 tl 431 2.5 v vco supply operational amplifier 1 burr brown opa2353 burr brown opa2350 integrator capacitor 10 5 integrator, blocking resistor 14 integrator, reference voltage crystal oscillator 1 toyocom tsx-2 19.44 mhz ferrite bead inductor 2 murata blm11b601s v ee blocking to gnd ( v cc ) its11420 integrator crystal data in integrator data out reference voltage clock out infineon - foa3251b1 2.488 gb/s transceiver and clock/data recovery
foa3251b1 S1028C1 external components data sheet 17 v1.0, 1999-08 figure 6 reference voltage for vco (ring oscillator). figure 7 loop filter pll1 (cdr) its11421 v cc 100 nf 1 tl431 2, 3 6, 7 10 f 5 n2v5 56 v ee resistor has to be adapted to supply voltage. 3.3 v 56 5.0 v 80 2.5 v referenz voltage its11422 1 k 1 k 100 nf 100 pf 100 100 pf pll1 dn 800 800 foa3251 v cc 100 100 100 nf 100 nf v cc v f01 pll1 up
foa3251b1 S1028C1 external components data sheet 18 v1.0, 1999-08 figure 8 loop filter pll2 (cmu) figure 9 crystal oscillator its11423 6.8 k 6.8 k 47 nf 10 pf 1.5 k 10 pf pll2 up 800 800 foa3251 v cc 100 1.5 k 47 nf 470 ff v cc v f02 pll2 dn its11424 xtal in 56 pf 33 pf tsx-2 v cc xtal out
foa3251b1 S1028C1 measurement results data sheet 19 v1.0, 1999-08 6 measurement results all measurements were done with 50 mvpp input swing and a 2e23 bit sequence. temperature was 25c, supply voltage was 3.3 v. figure 10 stm 16 jitter tolerance figure 11 stm 16 jitter transfer itd11425 10 1 10 -1 10 2 10 3 10 4 10 5 10 6 10 7 10 0 10 1 10 2 modulation frequency hz itd11426 10 1 -30 10 2 10 3 10 4 10 5 10 6 10 7 modulation frequency hz -20 -10 0 10
foa3251b1 S1028C1 measurement results data sheet 20 v1.0, 1999-08 figure 12 gitter generation results itd11427 jitter generation results cutoff frequency = 12.000 khz 16.281 mui p-p 2.516 mui rms
foa3251b1 S1028C1 package outlines data sheet 21 v1.0, 1999-08 7 package outlines figure 13 2) 1) 48 1 index marking 0.22 0.08 2) a 0.05 d 9 7 1) 0.5 5.5 a-b a-b 0.2 1) b 7 9 a-b m 0.2 d 4x dh 48x d c 48x 0.08 1.6 max. c 0.1 1.4 0.05 0.05 heatslug 7? max. 0.05 3.96 1.76 x 45? h 0.6 +0.075 -0.035 0.125 0.15 does not include dambar protrusion of 0.08 max. per side does not include plastic or metal protrusion of 0.25 max. per side p-lqfp-48-1 (plastic low profile quad flat package) gpp09269 you can find all of our packages, sorts of packing and others in our infineon internet page ?product s?: http://www.infineon.com/products. dimensions in mm
www.infineon.com published by infineon technologies ag infineon goes for business excellence ?business excellence means intelligent approaches and clearly defined processes, which are both constantly under review and ultimately lead to good operating results. better operating results and business excellence mean less idleness and wastefulness for all of us, more professional success, more accurate information, a better overview and, thereby, less frustration and more satisfaction.? dr. ulrich schumacher
foa3251b1 S1028C1 data sheet 23 v1.0, 1999-08 variables target specification variable name variable definition description business unit ics for communications dev_namelong1 high speed clock and data recovery for fiber optic applications long product name dev_namelong2 dev_namelong3 dev_namelong4 dev_nameshort1 foa3251b1 short product name dev_nameshort2 dev_nameshort3 dev_nameshort4 dev_package1 p-lqfp-48-1 package type dev_package2 dev_package3 dev_package4 dev_version1 device version dev_version2 dev_version3 dev_version4 device1 foa3251b1 marketing/sales name device2 device3 device4 doc_author author of the document doc_confidentialstatus ?confidential?, ?preliminary? or left blank
foa3251b1 S1028C1 data sheet 24 v1.0, 1999-08 doc_distribution "distribution with nda" or "distribution by marketing only" or "distribution with nda by marketing only" or left blank doc_issuedate 1999-08 complete date of releasing the document doc_state v1.0 revision state of the document doc_topright1 foa3251b1 defines the expression appearing on the top right of the page layout document type doc_topright2 S1028C1 doc_type data sheet document type doc_type_cover data sheet document type modification date short status technologie bipolar title_issuedate aug. 1999 issue date of the document appearing on the upper right corner of the 1st cover page variable name variable definition description
foa3251b1 S1028C1 data sheet 25 v1.0, 1999-08 instructions defining all variables 1. double-click on the variable definiton that you want to define. 2. choose ?edit definition ? 3. in the variable dialog box redefine the user variable in the ?definition ? box. if this variable should not be defined, enter a blank. 4. click on ?change? . 5. click ?done? to return to the variable dialog box. 6. click ?done? again. importing the variables into the framemaker document/book 1. make certain that both documents (your framemaker file/book and file variables.fm) are open. 2. from the ?file? menu, click on ?import? . 3. select ?format? . 4. from the ?import from file? (document) pop-up list, choose ?variables.fm?. 5. from the ?import and update? box, make sure that only the ?variable definition? check box is selected. click on ?import? to finish.

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