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02068-dsh-001-c mindspeed technologies ? april 2006 mindspeed proprietary and confidential the cx02068 is a highly integrated, programmable laser driver intended for telecom applications up to 622 mbps. using differential pecl data, the cx02068 supplies the bias and modulation current for driving an edge-emitting laser. the modulation output can be dc-coupled to the laser diode, giving a significant power saving over ac- coupled operation. the cx02068 includes automatic power control (apc) to maintain a constant average laser output power over temperature and life. in addition, the modulation current is temperature compensated to minimize variation in extinction ratio over temperature. output flags indicate laser end of life as well as failure of the apc circuitry to maintain average output power. features ? rise and fall times <180 ps operates with +3.3 volt supply dc or ac-coupled modulation drive. independently programmable laser bias (to 100 ma) and modulation current s (to 85 ma). automatic laser power control, with programmable temperature compensation and ?slow-start?. bias and modulation current monitors failure monitor available in bcc+24 , tqfp32 and die packages available in rohs compliant packages applications oc-3/stm1, sonet/sdh oc-12/stm4, sonet/sdh atm ftth functional block diagram x100 x55 failure detect dis ena 55 55 fail x1 oca d in bias mon mod mon out- out+ v dd i bias r modset r tcslope r tcstart r mpcset v dd c mpc v ref pd r oca oca set rd gnda r shunt c shunt i bias d in i mod pp revision information this document contains information that is subj ect to change without not ice. contact technical publications for latest revision information. cx02068 3.3 volt laser driver ic for 155/622 mbps
02068-dsh-001-c mindspeed technologies ? ii mindspeed proprietary and confidential ordering information part number package cx02068b24 bcc+24l cx02068tq32 tqfp32 cx02068g-09-t* bcc+24l, rohs cx02068g-tq32* tqfp32, rohs CX02068DIEWP waffle pack cx02068wafer whole 8? wafer on a 10? grip ring cx02068evm evaluation board with a cx02068b24 * the letter ?g? designator after the part number indicates that the d evice is rohs-compliant. refer to www.mindspeed.com for a dditional information. revision history revision level date asic revision description c preliminary april 2006 x added rohs package information, updated format, no specification changes. b preliminary may 2005 x updated to new data sheet format. a advance october 2003 x advance. bcc+24l top view 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 24 23 22 21 20 1 ena dis fail oca gnd bias out+ out- pd gnd gnd v cc gnd a c mpc tc slope tc start mod set oca set d in d in v cc 4mm bias mon 4mm mod mon v cc 2068 tqfp32 top view 1 2 7 6 5 4 3 8 24 23 18 19 20 21 22 17 12 9 10 11 15 14 13 16 29 32 31 30 26 27 28 25 n/c n/c n/c ena dis fail oca gnd pd out- out+ bias v cc d in d in v cc v cc bias mon mod mon v cc v cc v cc gnd a gnd a v cc c mpc nc tc slope gnd mod set oca set v cc 5mm 5mm
02068-dsh-001-c mindspeed technologies ? 1 mindspeed proprietary and confidential 1.0 product specification 1.1 absolute maximum ratings these are the absolute maximum ratings at or beyond which the ic can be expected to fail or be damaged. functional operation at these levels is not implied. 1.2 recommended operating conditions table 1-1. absolute maximum ratings parameter rating units power supply (v cc -gnd) -0.5 to +6.0 v operating ambient -40 to +85 c storage temperature -65 to +150 c maximum bias current 120 ma maximum laser modulation current (through out+/out2+, out-/out2-) 100 ma table 1-2. recommended operating conditions parameter rating units power supply (v cc -gnd) 3.3 10% v junction temperature (die) -40 to +120 c operating ambient -40 to +85 c
product specification 02068-dsh-001-c mindspeed technologies ? 2 mindspeed proprietary and confidential 1.3 dc characteristics v cc =+3.3v 10%, t a =-40 c to +85 c, unless otherwise noted. table 1-3. dc characteristics parameter conditions min typ max units supply current excluding i bias and i mod , but with i bias and i mod set to 50 ma -42 47 ma bias current adjust range limited by i ref across temperature range 4- 100 ma bias current with output disabled tx_dis = high - - 10 a bias current limit adjustment region ta = +85 c 20 - 100 ma change in bias current limit over temperature 100 - 130 a/c monitor diode reverse bias voltage 2 - - v monitor diode current adjustment range 10 - 1000 a ttl/cmos input high voltage (enable, disable) 2.0 - - v ttl/cmos input low voltage (enable, disable) -- 0.8 v cmos output high voltage (fail, oca) 2.4 - - v cmos output low voltage (fail, oca) - - 0.4 v differential input impedance data and clock inputs 2.5 - - k ? common-mode input voltage v cc -1.7 - v cc - v in (diff) 4 v self-biased common mode input voltage data and clock inputs v cc -1.7 - v cc -0.47 v
product specification 02068-dsh-001-c mindspeed technologies ? 3 mindspeed proprietary and confidential 1.4 ac characteristics vcc = +3.3v 10%, ta = -40 c to +85 c, unless otherwise noted. table 1-4. ac characteristics parameter conditions min. typ. max. units. differential input voltage =2 x (d in + high -d in + low ) (clock inputs follow same relationship) 300 - 1860 mv modulation current range 5 - 85 ma modulation current with out put disabled dis-high - - 300 a programmable range for modulation current temperature coefficient adjustable 500 - 10 4 ppm/c programmable temperature at which modulation current tc compensation enables programmed by choice of r tcslope 20 - 60 c modulation output rise/fall times 20% to 80% into 25 ? , with matching network - - 180 ps overshoot of modulati on output current into 25 ? load, with matching network -10 - +10 % modulation output pulse width distortion 1 measured using alternating 1-0 pattern - - 120 1 ps modulation output deterministic jitter peak-to-peak. measured into 25 ? load using: 2 23 -1 prbs at 622 mbps includes pulse width distortion - - 140 ps note: 1. contact your mindspeed sales representative concerning availability of parts with a maximum modulation output pulse width dis tortion of 80 ps or less
02068-dsh-001-c mindspeed technologies ? 4 mindspeed proprietary and confidential 2.0 pin description 2.1 pin descriptions table 2-1. pin descriptions pin no bcc+24 pin no tqfp32 name function -18v cc power supply. connect to vcc, do not leave open. - 22 gnda ground to output stage.(inductor to ground to optimize output stage performance) -32v cc power supply. connect to vcc, do not leave open. - 5, 6, 8, 27 nc not connected -7v cc power supply. connect to vcc, do not leave open. -25v cc power supply. connect to vcc, do not leave open. 1 9 ena bias and modulation output enable (ttl/cmos). high for normal operation 2 10 dis bias and modulation output disable (ttl/cmos). low for normal operation 311bias mon bias monitor. connect a resist or between this pin and v cc to monitor. connect to v cc if not in use. 412mod mon modulation monitor. connect a resistor between this pin and v cc to monitor. connect to v cc if not in use. 513fail mean power control failure indicat or (ttl/cmos). goes low when control loop is no longer able to maintain constant current at pd 614oca over-current alarm (ttl/cmos). goes low when i bias exceeds the preset bias current limit 7 - gnd ground. connect to vcc, do not leave open. 8 17 bias laser bias current output 91v cc power supply. connect to vcc, do not leave open. 10 19 out+ positive modulation current output. sinks current when d in is high. 11 20 out- negative modulation current output. sinks current when d in is high. 12 23 gnda ground to output stage.(inductor to ground to optimize output stage performance) 13 24 pd monitor photodiode input. this input is connect ed to the monitor photodiode anode for automatic power control. 14 26 c mpc mean power control dominant pole capacitor 15 15 gnd ground. connect to vcc, do not leave open. 16 28 tc slope connecting a resistor between this pin and ground sets the temperature coefficient of i modset (using the internal ic temperature).
pin description 02068-dsh-001-c mindspeed technologies ? 5 mindspeed proprietary and confidential 17 - tc start secondary temperature coefficient of i mod . a resistor on this pin to ground sets the threshold temperature at which the temperature compensation starts. 18 30 mod set modulation current set. connect a r esistor between this pin and ground 19 31 oca set over current alarm set. connect a r esistor between this pin and ground 20 4 v cc power supply. connect to vcc, do not leave open. 21 2 d in positive data input (pecl). self biased. 22 3 d in negative data input (pecl). self biased 23 16 v cc power supply. connect to vcc, do not leave open. 24 29 gnd ground. connect to vcc, do not leave open. table 2-1. pin descriptions (continued) pin no bcc+24 pin no tqfp32 name function
02068-dsh-001-c mindspeed technologies ? 6 mindspeed proprietary and confidential 3.0 functional description 3.1 overview the cx02068 laser driver consists of a high-speed modula tion driver and a laser bias generator with mean power control (mpc). it is optimized for high speed, low power operation at 3.3 v supply. figure 3-1. cx02068 block diagram x100 x55 failure detect dis ena 55 55 fail x1 oca d in bias mon mod mon out- out+ v dd i bias r modset r tcslope r tcstart r mpcset v dd c mpc v ref pd r oca oca set rd gnda r shunt c shunt i bias d in i mod pp
functional description 02068-dsh-001-c mindspeed technologies ? 7 mindspeed proprietary and confidential 3.2 features rise and fall times <180 ps operates with +3.3 volt supply dc or ac-coupled modulation drive independently programmable laser bias (to 100 ma) and modulation currents (to 85 ma) automatic laser power control, with programmable temperature compensation and ?slow-start? bias and modulation current monitors failure monitor available in bcc+24 , tqfp32 and die packages available in rohs compliant packages 3.3 modulator the modulator output stage is designed to drive up to 85 ma in either ac-coupled or dc-coupled mode. dc- coupled performance depends on the laser used. the cx02068 modulation output is optimized for driving a 25 ? dynamic load; the minimum required voltage at out+ and out- is 0.6 v. to interface with the laser diode, a matching resistor (rd) is required for impedance matching. an rc shunt network is necessary to compensate for the laser diode parasitic inductance, thereby improving the optical eye. typical values are r shunt = 51 ? , c shunt = 3.3 pf any capacitive loading at the cathode of a laser diode will degrade the optical output performance. an inductor is used to isolate the bias pin from the laser cathode. figure 3-2. typical modulation current vs r modset (3.3v) 0 0.01 0.02 0.03 0.04 0.05 0.06 0.07 0.08 0.09 0.1 0 5000 10000 15000 20000 25000 30000 35000 r modset ( ? ) i mod (a)
functional description 02068-dsh-001-c mindspeed technologies ? 8 mindspeed proprietary and confidential 3.4 mean power control loop to maintain constant average optical power, the cx02068 incorporates a control loop to compensate for the changes in laser threshold current over temperature and lifetime. a monitor photodiode mounted in the laser package is used to convert the optical power into a phot ocurrent. the mpc loop adjusts the laser bias current so that the monitor current is matched to a reference current set by a single external resistor (r mpcset ). the time constant of the loop is then determined by c mpc . safety logic is provided in order to limit the maximum bias current. the bias current at which the safety logic trips is set by an external resistor to ground (r oca ) from the oca set pin. when the bias current limit is reached alarm flag oca is asserted low. a loop failure alarm is also pr ovided to detect when the bias current can no longer be adjusted to achieve the desired average optical power. figure 3-3. typical bias current vs r biasset (3.3v) figure 3-4. typical limiting current vs r oca (at 25 c) 0 20 40 60 80 100 120 0 10000 20000 30000 40000 r biasset ( ? ) bias current (ma) 0 10 20 30 40 50 60 70 80 90 100 0 10000 20000 30000 40000 r oca ( ? ) i oca (ma)
functional description 02068-dsh-001-c mindspeed technologies ? 9 mindspeed proprietary and confidential figure 3-5. temperature coefficient of i oca at different r oca settings figure 3-6. typical eye diagram 0 0.02 0.04 0.06 0.08 0.1 0.12 0.14 0 5000 10000 15000 20000 25000 30000 35000 r oca ( ? ) change in i oca over temperature (ma/c)
functional description 02068-dsh-001-c mindspeed technologies ? 10 mindspeed proprietary and confidential 3.5 enable control the cx02068 incorporates a dual polarity laser driver enable function. when ena is low or dis is high, both the bias and modulation currents are off. 3.6 current monitors the cx02068 features bias and modulation current monitor outputs. the bias mon output sinks a current equal to nominally 1/55 of the laser bias current (i bias ). the mod mon output sinks a current equal to nominally 1/55 of the laser modulation current (i mod ). bias mon and mod mon should be connected through a pull-up resistor to v cc . choose a pull-up resistor value that ensures a voltage at bias mon greater than v cc -1.6 v and a voltage at mod mon greater than v cc -1.0 v. these pins should be tied to v cc if not used. 3.7 slow-start for laser safety and reliability, the cx0 2068 incorporates a slow-start circuit that provides a delay of approximately 200 ns before enabling the laser diode. 3.8 temperature compensation the cx02068 features built in temperature compensation of the modulation current set using external resistors. current pulled from tc slope adjusts the slope of the temperature compensation where as current pulled from tc start sets the threshold temperature for the coefficient.
functional description 02068-dsh-001-c mindspeed technologies ? 11 mindspeed proprietary and confidential figure 3-7. temperature compensation graphs tc slop e tc start 80ma 0ma +80c -40c 1 ? 2 ? 0.035 0.037 0.039 0.041 0.043 0.045 0.047 -40-20 0 20406080100 temperature (c) i mod (a) 5000 10000 20000 32000 rtc start = 0 ? , v cc = 3.3v rtc slope - figures shown are in ? 0.035 0.04 0.045 0.05 0.055 0.06 0.065 -40 -20 0 20 40 60 80 100 temperature (c) i mod (a) 5000 10000 20000 32000 rtc start = 250 ? , v cc = 3.3v rtc slope - figures shown are in ? 0.035 0.04 0.045 0.05 0.055 0.06 0.065 0.07 0.075 0.08 -40 -20 0 20 40 60 80 100 temperature (c) i mod (a) 5000 10000 20000 32000 rtc start = 400 ? , v cc = 3.3v rtc slope - figures shown are in ?
02068-dsh-001-c mindspeed technologies ? 12 mindspeed proprietary and confidential 4.0 packaging specification 4.1 packaging specification figure 4-1. bare die information bias gnd a v cca outp outn pd v cc oca set mod set gnd mpc set tc start tc slope c mpc d in ena dis bias mon mod mon fail oca outp outn v cca gnd a gnd a gnd gnd v cc gnd v cc gnd d in v cc gnd v cc v cc gnd gnd gnd v cc 1 9 10 20 21 31 32 41 dimensions: pad opening 84 x 84 m die size 1790 x 1718 m die thickness 300 m 10%
packaging specification 02068-dsh-001-c mindspeed technologies ? 13 mindspeed proprietary and confidential table 4-1. pad centers pin x y pin x y pin x y pin x y ena -727 440 bias -550 -711 v cc 727 -550 gnd 550 711 dis -727 330 gnd a -440 -711 c mpc 727 -440 v cc 440 711 gnd -727 220 v cca -330 -711 gnd 727 -33- d in 330 711 bias mon -727 110 *outp -210 -711 tc slope 727 -220 d in 220 711 mod mon -727 0 *outp -210 -711 gnd 727 -110 v cc 110 711 fail -727 -110 *outn 100 -711 tc start 727 0 gnd 0 711 gnd -727 -220 *outn 100 -711 mpc set 727 110 v cc -110 711 oca -727 -330 v cca 220 -711 gnd 727 220 v cc -440 711 gnd -727 -440 gnd a 330 -711 mod set 727 330 gnd -550 711 v cc -727 -550 gnd a 440 -711 oca set 727 440 pd 550 -711 v cc 727 550
packaging specification 02068-dsh-001-c mindspeed technologies ? 14 mindspeed proprietary and confidential figure 4-2. tqfp32 package information table 4-2. package dimensions dimensions tolerance 5 x 5 x 1.0 mm tqfp, +2.00 mm fp n lead count 32 amax. 1.20 a2 0.05 1.00 d 0.15 7.00 d1 0.05 5.00 e 0.15 7.00 e1 0.05 5.00 f1 0.10 2.67 f2 0.10 2.67 bottom view chamfer .203 (4x) exposed pad f1 f2 pin 1 id. 0 0.50p.05 c0.50p.05x45d / e1 e d1 d -b- -d- -a- 1 n top view b a2 a detail x detail a side view
packaging specification 02068-dsh-001-c mindspeed technologies ? 15 mindspeed proprietary and confidential figure 4-3. bcc+24l package information figure 4-4. smt mounting guides bottom view "b" 0.50 0.10 0.50 typ. 3.15 3.20 "c" 3.20 0.50 typ. 3.15 2.20 2.20 c.l(pkg.) c.l(pkg.) "a"(pin 1 corner) 0.50 0.10 top view 0.15 y x 4.00 0.10 (pin 1 corner) 4.00 0.10 bcc pads viewed from above corner pads exposed central pad (connected to ground plane) 0.4 mm 0.3mm pad 0.45mm 0.45mm pad pad 2.1mm 2.1mm pcb land 0.1m m 0.1mm 0.1mm 0.1mm solder resist mask 0.025m m 0.025mm 0.025mm pcb land 1.0mm 0.35m m 0.1mm 0.025 mm 0.025 mm 0.025 mm solder resist mask paste stencil 1.3mm 0.2mm 0.2mm pcb land lower right pad 1.0mm 1.0m m 0.025mm 0.025m m 0.025m m 0.025mm 0.025m m solder resist mask paste stencil 1.26mm 1.26mm paste stencil 0.55mm 0.55mm 0.125m m 0.125m m w indow stencil 0.025mm 0.025mm 0.675m m 0.675m m
www.mindspeed.com general information: telephone: (949) 579-3000 headquarters - newport beach 4000 macarthur blvd., east tower newport beach, ca 92660 ? 2006 mindspeed technologies ? , inc. all rights reserved. information in this document is provided in connection with mindspeed technologies ? ("mindspeed ? ") products. these materials are provided by mindspeed as a service to its customers and may be used for informational purposes only. except as provided in mindspeed?s terms and conditions of sale for such products or in any separate agreement related to this document, mindspeed assumes no liability whatsoever. mindspeed assumes no responsibility for errors or omission s in these materials. mindspeed may make changes to specifications and product descriptions at any time, without notice. mindspeed makes no commitment to update the information and shall have no responsibility whatsoever for conflicts or incom patibilities arising from future changes to its specifications and product descriptions. no license, ex press or implied, by estoppel or otherwise, to any intellectual property rights is granted by this document. these materials are provided "as is" withou t warranty of any kind, either express or implied, relating to sale and/or use of mindspeed products including liability or warranties relating to fitness for a particular purpose, consequential or incidental damages, merchantability, or infringement of any patent, copyright or other intellectual property right. mindspeed further does not warrant the accuracy or completeness of the information, text, graph ics or other items contained within these materials. mindspeed shall not be liable fo r any special, indirect, incidental, or consequential damages, including without li mitation, lost revenues or lost profits, which may result from the use of these materials. mindspeed products are not intended for use in medical, lifesaving or life sustaining applications. mindspeed customers using or selling mindspeed pr oducts for use in such applications do so at their own risk and agree to fully indemnify mindspeed for any damages resulting from such improper use or sale. 02068-dsh-001-c mindspeed technologies ? 16 mindspeed proprietary and confidential

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