description up to 2.5gbps operation 30ma modulation current separate modulation control separate output enable for laser safety differential inputs for data 75k ? input pull-down resistor 3.3v and 5v power supply options available in a tiny 10-pin (3mm 3mm) msop the SY88922V is a high-speed current switch for driving a semiconductor laser diode in optical transmission applications. the modulation current (i out ) is controlled by the current (i rset ) through the external resistor r set . the output out is high when output enable is high. the device incorporates complementary open collector outputs with a capability of driving peak current of 30ma. the resistor r ext must be placed between /out and v cc to dissipate the worst case power. r ser is recommended to compensate for laser diode matching issues. pin 9 and pin 10 should be connected to achieve better performance. the SY88922V utilizes the high-performance bipolar asset technology. all support documentation can be found on micrel? web site at www.micrel.com. features 5v/3.3v 2.5gbps laser diode driver block diagram SY88922V 1.25gbps and 2.5gpbs gigabit ethernet 531mbps, 1062mbps and 2.12gbps fibre channel 622mbps sonet gigabit interface converter 2.5gbps sdh/sonet 2.5gbps proprietary links applications d in v cc r ext /out out r ser to laser diode /d in modulation control internal logic bias control / en i mod v ref 40x r set gnd v cc gnd r set 1 rev.: d amendment: /0 issue date: may 2004 m0766-012804 hbwhelp@micrel.com or (408) 955-1690 asset is a trademark of micrel, inc.
2 SY88922V micrel m0766-012804 hbwhelp@micrel.com or (408) 955-1690 package/ordering information ordering information (1) package operating package part number type range marking SY88922V k10-1 commercial SY88922V SY88922Vtr (2) k10-1 commercial SY88922V notes: 1. contact factory for die availability. die is guaranteed at t a = 25 c, dc electricals only. 2. tape and reel. pin number pin name pin function 1 /en enable. this pecl 100k compatible input enables laser driver. modulation current goes to zero when asserted high. 2, 3 din, /din differential pecl 100k compatible inputs which receive nrz data. 4 vref voltage reference for use with r set . 5 rset an external resistor sets up the source current for modulation i mod . 6 vcc most positive power supply input. 7 gnd ground. 8, 9, 10 /out, out open collector outputs from the modulation buffer drive these differential current outputs. pin description rset vcc 6 5 1 /en din /din vref 10 out out /out gnd 9 8 7 2 3 4 10-pin msop (k10-1) d /d /en out (2) /out lhlhl hlllh xxhhl notes: 1. l = low, h = high, x = don't care. 2. h = i out = 0ma. truth table (1)
3 SY88922V micrel m0766-012804 hbwhelp@micrel.com or (408) 955-1690 absolute maximum ratings (1) supply voltage (v cc ) ..................................... +0v to +7.0v input voltage (v in ) .................................................0 to v cc output current (v out ) ............................................... 30ma power dissipation (p d ) ........................................... 250mw lead temperature (soldering, 10 sec.) ..................... 265 c storage temperature (t s ) ....................... 55 c to +125 c operating ratings (2) supply voltage (v cc ) .............................. +4.5v to +5.5v or ............................................................ +3.0v to +3.6v ambient temperature (t a ) ......................... 40 c to +85 c capacitance on out + /out (c out ) ................ 2.5pf (typ.) resistor to dissipate power (r ext ) .................... 10 to 50 ? laser diode serial resistor (r ser ) ...................... 0 to 50 ? resistor to adjust current (r set ) (4) ............... 700 to 20,000 ? package thermal resistance (3) msop ( ja ) still-air ........................................... 113 c/w msop ( jb ) ........................................................ 74 c/w gnd = 0v; v cc = +5.0v 10% or v cc = +3.3v 10%; t a = 40 c to +85 c; unless noted. symbol parameter condition min typ max units v ih input high voltage (d in , /d in , /en) v cc 1165 v cc 880 mv v il input low voltage (d in , /d in , /en) v cc 1810 v cc 1475 mv v ref reference voltage 1.7 2.0 2.3 v i il input low current 0.5 a (d in , /d in , /en) (5) i ih input high current (d in , /d in , /en) 100 a i cc supply current (6) 25 ma i ol output low current (/en = high) 450 1000 a i out modulation current 30 ma i rset modulation control 0.125 0.625 ma a rset =i out /i rset 30 38 44 notes: 1. permanent device damage may occur if absolute maximum ratings are exceeded. this is a stress rating only and functional opera tion is not implied at conditions other than those detailed in the operational sections of this data sheet. exposure to absolute maximum ratings co nditions for extended periods may affect device reliability. 2. the voltage drop across r ext and r ser plus laser diode should not be greater than 1v. 3. still-air without heatsink. 4. r set minimum 430 ? . 5. v in = v il (min). 6. i mod = 25ma. dc electrical characteristics
4 SY88922V micrel m0766-012804 hbwhelp@micrel.com or (408) 955-1690 i mod =10ma; gnd = 0v; v cc = +5v 10% or v cc = +3.3v 10%; t a = 40 c to +85 c; unless noted. symbol parameter condition min typ max units t pd d propagation delay (d in out) 400 ps t pd en propagation delay (/en out) 400 ps t r , t f rise/fall time (8) 74 130 ps (20% to 80%) i or output current ringing (9) 10 % d j deterministic jitter (10) 7ps rms notes: 7. r ext = r ser = 25 ? 1%; r ser connects to v cc directly without laser diode. 8. i mod = 10ma. 9. i oh = 5 to 25ma. 10. i mod = 10ma, 2.5gbps, 2 23 1 pattern. ac electrical characteristics (7) typical characteristics 0 10 20 30 40 0.0 1.0 2.0 3.0 4.0 5.0 i out ( a) r set (k ? ) i out vs. r set v cc = 3.3v v cc = 5.0v
5 SY88922V micrel m0766-012804 hbwhelp@micrel.com or (408) 955-1690 10 lead msop (k10-1) rev. 00 micrel, inc. 1849 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 a ssumed by micrel for its use. micrel reserves 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 malfu nction of a product can reasonably be expected to result in personal injury. life support devices or systems are devices or systems that (a) are intend ed 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 inj ury to the user. a purchaser s use or sale of micrel products for use in life support appliances, devices or systems is at purchaser s own risk and purchaser agrees to fully indemnify micrel for any damages resulting from such use or sale. ? 2004 micrel, incorporated.
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