sy88024l 11.3gbps vcsel driver micrel inc. ? 2180 fortune drive ? san jose, ca 95131 ? usa ? te l +1 (408) 944 - 0800 ? fax + 1 (408) 474 - 1000 ? http://www.micrel.com october 2009 m9999 - 102809-a hbwhelp@micrel.com or (408) 955 - 1690 general description the sy88024l is a single 3.3v supply, small form factor vcsel driver for datacom applications at data rates up to 11.3gbps. the driver can deliver mod u lation current up to 20ma and a bias current up to 20ma all support documentation c an be found on micrel?s web site at: www.micrel.com . . features ? operates from a single 3.3v supply ? operation up to 11.3gbps ? modulation current up to 20ma ? bias current up to 20ma ? small form factor 3mm x 3mm qfn packag e applications ? multi - rate lan up to 11.3gbps: 8xfc, 10g gbe. ? sfp+, xfp, xpak, xenpak, x2, msa 300 optical modules __________________________________________________________________________________________ typical application
micrel, inc. sy88024l october 2009 2 m9999 - 102809-a hbwhelp@micrel.com or (408) 955 - 1690 ordering informati on (1) part number voltage temperature range package lead finish sy88024lmg 3.3v ? 40 to +85c qfn -16 nipdau pb - free SY88024LMGTR (2) 3.3v ? 40 to +85c qfn -16 nipdau pb - free notes: 1. contact factory for die availability. dice are guaranteed at t a = +25 c, dc electricals only. 2. tape and reel. pin configuration 16- pin qfn
micrel, inc. sy88024l october 2009 3 m9999 - 102809-a hbwhelp@micrel.com or (408) 955 - 1690 pin description pin number pin name pin function 1, 4, 9, 12 vcc supply voltage. bypass with a 0.1f//0.01f low esr capacitor as close to the vcc pins as poss ible. 8, 14 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 vcc. 3 din ? inverting input data. internally terminated with 50 ? to vcc. 5 modset modulation current setting and control. apply a voltage within the range 0v to1.2v to this pin to set the modul a tion current. input impedance 25k ?. 6 /en active low ttl. internal 75k ? pull down to gnd. the driver is enabled when this pin is unconnected or /en is asserted low and disabled when /en asserted high. 7 eqset install a resistor from this pin to gnd to s et the desired equalization level. 0 ? will provide maximum equalization and 2k ? or higher will provide negligible equalization. leave open if no equalization is needed. 10 mod ? inverted modulation current output. provides modulation current when input dat a is nega tive. 11 mod+ non - inverted modulation current output. provides modulation current when i n put data is positive. 13 bias bias current output 15 biasmon bias current monitor. install an external resistor from this pin to gnd to convert the output current to a voltage proportional to the bias current 16 biasset bias current setting and control. apply a voltage within the range 0v to 1.2v to this pin to set the bias current. input impedance 25k ?. truth table din+ din - /en mod+ (1) mod - laser output (2) l h l h l l h l l l h h x x h h h l notes: 1. i mod = 0 when mod+ = h. 2. assuming that the laser cathode is tied to mod+ .
micrel, inc. sy88024l october 2009 4 m9999 - 102809-a 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 ambie nt 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 = 6ma, i bias = 6ma. symbol parameter condition min typ max units i cc power supply current modulation and bias currents excluded 50 65 (4) ma v mod_min minimum voltage required at the driver output (headroom) for proper operation 1.2 v v bias_min minimum voltage required at the bias output (headroom) for proper operation 1.2 v r in input resistance, single ended 45 50 55 ? v id differential input voltage swing 100 1000 mv pp v il /en input low 0.8 v v ih /en input high 2 v i bias bias current 1 20 ma i bias_off bias off current current at bias when the device is disabled 150 a r modset input resistance at mod set pin 25 k ? v modset voltage range at modset pin imod range 2ma to 20ma 1.2 v r biasset input resistance at biasset pin 25 k ? v biasset voltage range at biasset pin ibias range 1ma to 20ma 1.2 v notes: 1. exceeding the absolute maximum rating may damage the device. 2. the device is not guaranteed to function outside its operating rating. 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. maximum i cc measured with i mod = 20ma and i bias = 20ma and mod+/mod - tied to vcc.
micrel, inc. sy88024l october 2009 5 m9999 - 102809-a hbwhelp@micrel.com or (408) 955 - 1690 ac 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 = 6ma, i bias = 6ma. symbol parameter condition min typ max units data rate nrz 11.3 gbps i mod (5) modulation current ac - coupled 2 20 (6) ma i mod_off modulation off current current at mod+ and mod - when the device is disabled 150 a t r output current rise time 20% to 80%, 25 ? load 25 35 ps t f output current fall time 20% to 80%, 25 ? load 25 35 ps dj deterministic jitter k25.8 pattern at 11.3gbps, v in = 200mv pp 4 ps pp rj random jitter k25.8 pattern at 11.3gbps, v in = 200mv pp 0.3 ps pp notes: 5. i mod is defined as the current going into the external load, which is equal to the total current of the output device subtracted by t he current going into the internal 50 ? pull - up. 6. i mod(max) is defined for a 50 ? external load.
micrel, inc. sy88024l october 2009 6 m9999 - 102809-a hbwhelp@micrel.com or (408) 955 - 1690 typical characteristics ibias / ibiasmon vs ibias 50 60 70 80 90 100 110 120 2 5 10 15 20 25 ibias (ma) bias gain 0 5 10 15 20 25 30 35 40 100 200 400 600 800 1000 vbiasset (mv) modulation gain 0 5 10 15 20 25 30 15 250 550 850 1150 vmodset (mv) note: i mod is defined for a 50 ? external load. functional characteristics
micrel, inc. sy88024l october 2009 7 m9999 - 102809-a hbwhelp@micrel.com or (408) 955 - 1690 input and output stages figure 1a. simplified input stage figure 1 b. simplified output stage interfacing the input to differential logic drivers figure 2a. ac - coupling to lvpecl driver figure 2b. ac - coupling to cml driver
micrel, inc. sy88024l october 2009 8 m9999 - 102809-a hbwhelp@micrel.com or (408) 955 - 1690 functional diagram functional description as shown on the block diagram abo ve, the driver is composed from an input equalizer, and a modulation block consisting of a pre - driver, and a current source. equalizer the input equalizer allows for compensation of up to 9? of fr4 microstrip trace or equivalent. the equalization restores the losses in high frequency components of the signal caused by its travel on the line card traces and through the connectors between the line card and the module before it reaches the input stage. the amount of equalization is programmable with a resisto r from pin 7 to ground. modulator the modulator consists of a pre - driver and a current source. the modulation current is set in the pre - driver by applying a voltage within the range 0v to 1.2v to pin 5 (modset). the pre - driver provides the current to the output stage, which consists of a current source composed from a differential pair which collectors are connected to mod+/mod - pins and have 50 ? internal termination to vcc. the modulation gain curve on page 6 shows modulation current variation versus the applied voltage at modset pin. bias the bias is set by applying a voltage within the range 0v to 1.2v to pin 16 (biasset). the bias gain curve on page 6 shows bias current variation versus the applied voltage at pin 16. the sy88024l driver is designed to work with one of the micrel?s mic300x series of controllers which have built in apc (automatic power control) circuit and a serial interface for programming modulation and bias, temperature compensation tables, setting registers, and monitoring registers r ead back. refer to the mic3001/mic3002/mic3003 datasheets for more details. the applications section below shows how to set up the driver to work correctly with the mic300x controller.
micrel, inc. sy88024l october 2009 9 m9999 - 102809-a hbwhelp@micrel.com or (408) 955 - 1690 application information figure 3, below, illustrates a typic al optical transceiver using the sy88024l and one of the micrel?s fom management ic mic300x. figure 3. typical optical transceiver
micrel, inc. sy88024l october 2009 10 m9999 - 102809-a hbwhelp@micrel.com or (408) 955 - 1690 package information 16- pin (3mm x 3mm) qfn 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. however, no responsibility is assumed by micrel for its use. micrel rese rves the right to change circuitry and specifications at any time without notification to the customer. 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 inte nded 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 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 a nd purchaser agrees to fully indemnify micrel for any damages resulting from such use or sale. ? 2009 micrel, incorporated.
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