sy88782l 3.3v, 1.25gbps high - current, low - power laser driver for datacom telecom applications m icrel inc. ? 2180 fortune drive ? san jose, ca 95131 ? usa ? tel +1 ( 408 ) 944 - 0800 ? fax + 1 (408) 474 - 1000 ? http://www.micrel.com january 2010 m9999 - 011310 hbwhelp@micrel.com or (408) 955 - 1690 general description the sy88782l is a single supply 3.3v low power consump tion , small - form factor, driver for telecom/datacom applications using fp/dfb lasers at data rates up to 1.25gbps. the driver can deliver mod u lation current up to 90ma, and the hig h compliance voltage it offers makes t he part suitable for high - current oper a tion ( with the laser ac - or dc - coupled to it .) this device is intended to be used with micrel mic3003 optical transceiver manag e ment ic which allows for modulation and bias curren ts co n trol and monitoring, automatic power control, and te m perature compensation. all support documentation can be found on micrel?s web site at: www.micrel.com . features ? 2.3v minimum laser compliance voltage ? 4 8 ma po wer supply current typical ? operation up to 1.25gbps ? modulation current up to 90ma ? des igned for use with the mic3003 ? small form factor 3mm x 3mm qfn package applications ? multi - rate lan, m an applications up to 1.25gbps: ? ethernet, sonet oc3/12/24 and sdh s tm1/4/8 ? sff, sfp modules markets ? telecom, datacom ________________________________________________________________ typical application laser dc - coupled to the driver laser ac - coupled to the driver
micrel, inc . sy88782l january 2010 2 m9999 - 011310 hbwhelp@micrel.com or (408) 955 - 1690 functional block diagram ordering information (1) part number package type operating range package marking lead finish sy88782lmg qfn -16 indu s trial 782l with pb - free bar - line indicator nipdau pb - free SY88782LMGTR (2) qfn -16 indu s trial 782l with pb - free bar - line indicator nipdau pb - free no tes : 1. contact factory for die availability. dice are guaranteed at t a = +25c, dc electricals only. 2. tape and reel. pin configuration 16- pin qfn
micrel, inc . sy88782l january 2010 3 m9999 - 011310 hbwhelp@micrel.com or (408) 955 - 1690 pin description pin name pin number pin function 1, 4, 7, 8, 13 gnd ground. ground and exposed pad must be connected to the plane of the most negative potential. 2 din+ non - inverting input data. internally terminated with 50 ? to a reference vol t age. 3 din ? inverting input data. internally terminated with 50 ? to a reference vol t age. 5, 6 vcc supply v oltage. bypass with a 0.1f//0.01f low - esr capacitor as close to v cc pin as possible. 9, 10 mod ? inverted modulation current output. outputs modulation current when input data is neg a tive. 11, 12 mod+ non - inverted modulation current output. outputs modu lation current when i n put data is positive. 14 vref reference voltage. install a 0.1f capacitor between v ref and v cc. 15 im_set modulation current setting and control. the voltage applied to this pin will set the modul a tion current. to be connected to t he mic3003 pin 24 (vmod+). input impedance 25k ? . 16 /en a low - level signal on this pin will enable the output stage of the driver. i n ternally pulled down with 75k ? . truth table din+ din - /en mo d+ (1) mod - laser output (2) l h l h l l h l l l h h x x h h l l notes : 1. i mod = 0 when mod+ = h. 2. assuming that the laser is tied to mod+.
micrel, inc . sy88782l january 2010 4 m9999 - 011310 hbwhelp@micrel.com or (408) 955 - 1690 absolute maximum ratings (1) supply voltage (v in ) ........................... ? 0.5v to +4.0v cml input voltage (v in ) .......... v cc ? 1.2v to v cc +0.5v ttl control input voltage (v in ) ................... 0v to v cc lead temperature (soldering, 20sec.) ........... +260c storage temperature (t s ) ............... ? 65c to +150c operating ratings (2) supply voltage (v cc ) ........................... +3.0v to +3.6v ambient temperature (t a ) ................ ? 40c to +85c package thermal resistance (3) qfn ( ja ) still - air ............................................. 60c/w ( jb ) ......................................................... 33c/w dc electrical characteristics t a = ? 40c to +85c and v cc = +3.0v to +3.6v, unless otherwise noted. typical values are v cc = +3.3v, t a = 25c, i mod = 60ma. symbo l parameter condition min typ max units i cc power supply current modulation currents excluded 48 65 (4) ma v mod_min minimum voltage required at the driver output (headroom) for proper operation 0.6 v r in(data) input resistance (din+, din -) 45 50 55 ? v id differential input voltage swing 200 2400 mv pp /en low 0.8 v /en high 2 v r in (imod_set) i m_set input resistance 25 k ? v im_set voltage range on i m_set pin i mod range 10ma to 90ma 1.2 v ac electrical characteristics t a = ? 40c t o +85c and v cc = +3.0v to +3.6v, unless otherwise noted. typical values are v cc = +3.3v, t a = 25c, i mod = 60ma. symbol parameter condition min typ max units data rate nrz 0.05 1.25 gbps i mod modulation current (5) ac - coupled 10 90 ma dc- coupled 10 70 (6) ma i mod_off modulation off current current at mod+ when the device is disabled 750 ?a t r output current rise time 20% to 80%, i mod = 60ma 55 80 ps t f output current fall time 20% to 80%, i mod = 60ma 55 80 ps total jitter @1.25gbps data rate 20 ps pp pulse - width distortion 20 ps notes : 1. permanent device damage may occur if absolute maximum ratings are exceeded. this is a stress rating only and functional operation is not implied at conditions other than those detailed in the operational sections of this data sheet. exposure to absolute maxi mum ratings conditions for extended periods may affect device reliability. 2. the data sheet limits are not guaranteed if the device is operated beyond the operating ratings. 3. package thermal resistance assumes exposed pad is soldered (or equivalent) to the devices most negative potential on the pcb. jb uses a 4 - layer and ja in still air unless otherwise stated. 4. i cc = 65 ma for worst - case conditions with i mod = 90ma, t a = +85c, v cc = 3.6v. 5. load = 15 ?. 6. assuming v cc = 3.0v, laser bandgap voltage = 1v, laser package inductance = 1nh, laser equivalent series resistor = 5 ?, and damping resistor = 10 ?.
micrel, inc . sy88782l january 2010 5 m9999 - 011310 hbwhelp@micrel.com or (408) 955 - 1690 typical operating characteristics
micrel, inc . sy88782l january 2010 6 m9999 - 011310 hbwhelp@micrel.com or (408) 955 - 1690 functional characteristics
micrel, inc . sy88782l january 2010 7 m9999 - 011310 hbwhelp@micrel.com or (408) 955 - 1690 input and output stages figure 1a. simplified input stage figure 1b. simplified output stage interface the input to different logic drivers figure 2a. dc - coupling to lvpecl driver figure 2b. ac - coupling to lvpecl driver figure 2c. ac - coupling to cml driver figure 2d. ac - coupling to lvds driver
micrel, inc . sy88782l january 2010 8 m9999 - 011310 hbwhelp@micrel.com or (408) 955 - 1690 16 lead (3mmx3mm) micrel, inc. 2180 fortune drive san jose, ca 95131 usa tel +1 (408) 944 - 0800 fax +1 (408) 474 - 1000 web http:/www.micrel.com the information furnished by micrel in this data sheet is believed to be accurate and reliable. how ever, no responsibility is assumed by micrel for its use. micrel reserves the right to change circuitry and specifications at any time without notification to the custome r. micrel products are not designed or authorized for use as components in life suppo rt appliances, devices or systems where malfunction 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 sust ain life, and whose failure to perform can be reasonably expected to result in a significant injury to the user. a purchaser?s use or sale of micrel products for use in life support appliances, devices or systems is a purchaser?s own risk and purchaser agr ees to fully indemnify micrel for any damages resulting from such use or sale. ? 2005 micrel, incorporated.
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