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sy88216l 3.3v, 2.5gbps burst mode laser driver micrel inc. ? 2180 fortune drive ? san jose, ca 95131 ? usa ? tel +1 ( 408 ) 944 - 0800 ? fax + 1 (408) 474 - 1000 ? http://www.micrel.com july 2008 m9999 - 071108-c hbwhelp@micrel.com or (408) 955 - 1690 general description the sy88216l is a single supply 3.3v burst mode laser driver for a - pon, b - pon, epon, ge - pon, and g - pon applications with data rates from 155mbps up to 2.5gbps. the driver can deliver mod u lation current up to 85ma, and provides a high compliance voltage that makes it suitable for high - current oper a tion with the laser dc - coupled to it. all support documentation can be found on micrel?s web site at: www.micrel.com . features ? 2.4v minimum laser compl iance voltage ? operation up to 2.5gbps ? fast burst mode enable/disable delay ? modulation current up to 85ma ? bias current up to 70ma ? infinite bias current hold time between bursts ? safety features ? power monitoring ? available in 24 - pin (4mm x 4mm) qfn package ap plications ? multi - rate burst mode applications: a - pon, b - pon, g - pon, e - pon, ge - pon markets ? fiber - to - the - premises (fttp): fiber - to - the - home (ftth), fiber - to - the - business (fttb) ? fttc (fiber - to - the - curb) ______________________________________________________ _____________________________________________________ typical application
micrel, inc. sy88216l july 2008 2 m9999 - 071108-c hbwhelp@micrel.com or (408) 955 - 1690 ordering information (1) part number package type operating range package marking lead finish sy88216lmg qfn -24 indu s trial 216l with pb - free bar - line indicator nipdau pb - free sy8 8216lmgtr (2) qfn -24 indu s trial 216l with pb - free bar - line indicator nipdau pb - free notes: 1. contact factory for die availability. dice are guaranteed at t a = +25c, dc electrical only. 2. tape and reel. pin configuration 24- pin qfn
micrel, inc. sy88216l july 2008 3 m9999 - 071108-c hbwhelp@micrel.com or (408) 955 - 1690 pin descrip tion pin number pin name pin function 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 ben+ non - inverting burst enable. accept s any input, single - ended or differential: ttl/cmos, lvpecl, cml, lvds, hstl, and sstl. ben requires an external termination. see figure 2. 6 ben - inverting burst enable. accepts any input, single - ended or differential: ttl/cmos, lvpecl, cml, lvds, hstl, and sstl. ben requires an external termination. see figure 2. 7 /en active low ttl/cmos. internally pulled - up. pull - down with a 22k ? or lower resistance or apply a low level signal (<0.8 v) to enable bias and modulation. keep floating or apply a high leve l (>2 v) to disable. 9 osc internal oscillator setting option. install a 0 ? resistor from this pin to vcc or leave it open to set the frequency. refer to the frequency table. 10 /apcfault indicates apc failure when low. active low ttl/cmos. 12 pwrmon power monitor. provides a current which is proportional to the sum of bias cu rrent and half of modulation current. install a resistor between this pin and gnd to convert that current to a voltage. 13 bias - inverting laser bias current output. pull - up to vcc with a resistor. 14 bias+ non - inverting laser bias current output, source s current when ben is high. connect to the cathode of the laser through a resistor. 16 mod+ non - inverted modulation current output. provides modulation current when i n put data is positive. 17 mod - inverted modulation current output. provides modulation current when input data is neg a tive. 20 md input from the laser monitoring photodiode. connect to the anode of the photodiode for apc operation. 22 biasmax install a resistor between this pin and gnd to set the maximum bias current for the closed loop op eration. the apc loop controls the bias current up to the level of biasmax. when the bias current reaches the maximum value set through this pin, the driver continues to sink a current equal to this maximum. for open loop operations, this pin sets the bia s current. 23 modset modulation current setting and control. the modulation current is set by installing an external resistor from this pin -to - ground or using a current source. 24 apcset bias current setting and control. the bias current is set by instal ling an external resistor from this pin to ground or using a current source. connect a 50k resistor -to - gnd for open loop operation. 8, 11,19 gnd ground. ground and exposed pad must be connected to the plane of the most negative potential. 1, 4, 15, 18, 2 1 vcc supply voltage. bypass with a 0.1f//0.01f low esr capacitor as close to vcc pin as possible. 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 l l oscillator frequency osc frequency (mhz) open 25 vcc 50 notes: 1. i mod = 0 when mod+ = h. 2. assuming that the laser is tied to mod+.
micrel, inc. sy88216l july 2008 4 m9999 - 071108-c hbwhelp@micrel.com or (408) 955 - 1690 absolute maximum ratings (1) supply voltage (v cc ) .................................... ? 0.5v to +4.0v cml input voltage (v in ) .................... v cc ? 1.2v to v cc +0.5v ttl control input voltage (v i ) ..................... 0v to v cc +0.3v 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 ........................................................ 75c/w ( jb ) ................................................................... 30c/w dc electrica l 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 = 25ma, i bias = 20ma. symbol parameter condition min typ max units i cc power supply current modulation and bias curren ts excluded 55 95 (4) ma v mod_min minimum voltage required at the driver output, mod+ and mod -, for proper operation 0.6 v v bias_min minimum voltage required at the driver output, bias+ and bias -, for proper operation 0.8 v i bias bias - on current v oltage at bias pin 0.8v 1 70 ma i bias_off bias - off current current at bias pin when /en is high or ben is low 150 a r in input resistance at din+ and din - single ended 42.5 50 57.5 ? v diff - in (din) differential input voltage swing 100 2400 mv pp v il (/en) /en input low 0.8 v v ih (/en) /en input high 2 v v ol /apcfault output low i ol = 2ma 0.5 v i oh /apcfault output leakage v oh = v cc 100 a ben+, ben - burst mode enable signal single ended 0.8 v v ih (ben) high voltage ben+, ben - v cc + 0.3 v v il (ben) low voltage ben+, ben - - 0.3 v v in (ben) input voltage swing ben+, ben - 100 mv v diff - in (ben) differential input voltage swing ben+, ben - 200 mv pp v pwrmon maximum voltage at pwrmon pin 1.25 v i md current range at md pin 50 1500 a 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 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 expose d 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 = 95ma for worst - case conditions with i mod = 85ma, i bias = 70ma, t a = +85c, v cc = 3.6.
micrel, inc. s y88216l july 2008 5 m9999 - 071108-c hbwhelp@micrel.com or (408) 955 - 1690 ac electr ical 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 = 25ma, i bias = 20ma . symbol parameter condition min typ max units data rate nrz 0.155 2.5 gbps i mod modulation current (5) ac - coupled 10 85 ma dc- coupled, voltage at mod pin 0.6v 10 70 (6) ma i mod_off modulation off current current at mod+ when /en is high or ben is high 150 a current at mod - when /en is high or ben is low 150 a t r output current rise time 20% to 80%, i mod = 60ma 60 85 ps t f output current fall time 20% to 80%, i mod = 60ma 60 85 ps jitter total jitter (7) 155mbps 30 ps pp 622mbps 30 1.25gbps 30 2.5gbps 30 t init apc loop initialization time power up with /en low and ben high 12 s /en changes from high to low with power o n and ben high 10 s ben changes from low to high with power on and /en low 2.5 ns burst enable delay (8, 9) 2.5 ns burst disable delay (8, 10) 2 ns burst on - time 155mbps 1.9 s 622mbps 720 ns 1.25gbps 576 ns 2.5gbps 576 ns burst off - time 155mbps 1.9 s 622mbps 720 ns 1.25gbps 576 ns 2.5gbps 576 ns notes: 5. load = 15 ?. 6. assuming v cc = 3.0v, laser bandgap voltage = 1v, laser package inductance = 1nh, laser equivalent series resistor = 5 ?, and damp ing resistor = 10 ?. 7. total jitter is measured using 2 7 ? 1 prbs pattern. 8. measured with a laser equivalent resistive load. 9. burst enable delay is measured as the time between the instant when the ben+ signal going from low to high reaches 50% of its amplitude and the instant at which the modulation current or the bias current (whichever takes longer) reaches 90% of its final value. 10. burst disable delay is measured as the time between the instant when the ben+ signal going from high to low reaches 50% of it s amp litude and the instant at which the modulation current or the bias current (whichever takes longer) goes below 10% of its final valu e.
micrel, inc. s y88216l july 2008 6 m9999 - 071108-c hbwhelp@micrel.com or (408) 955 - 1690 functional diagram
micrel, inc. s y88216l july 2008 7 m9999 - 071108-c hbwhelp@micrel.com or (408) 955 - 1690 detailed functional description the sy88216l burst mode laser driver is comprised from a fas t modulator, a fast bias circuit, and a digital apc loop that allows for fast laser turn - on time. the modulator is comparable to a fast continuous mode modulator that turns on in the nanosecond range. the bias circuit has a differential pair at the output to allow for fast turn - on time. both modulator and bias differential pairs can be enabled for burst operation by applying a high level signal at ben+ pin and a low level signal at ben - pin. the driver features a power monitoring function. bias and modulati on setting bias and modulation currents are set by installing resistors from apcset (pin24) - to - ground and from modset (pin23) - to - ground respectively or by applying a negative current at those pins. i bias variation versus r apcset resistor, i bias variation v ersus r biasmax resistor, and i mod variation versus r modset resistor are shown on page 8. biasmax a resistor between the biasmax pin and ground sets the maximum bias the driver can sink. at normal operation, the bias current tracks the laser optical power through the laser monitoring photodiode and the apc loop to compensate for any power deviation from the nominal value set at the start of operation using apcset. if any failure occurs (laser or photodiode degradation, open feedback circuit etc.) the apc l oop keeps increasing the bias current in an effort to compensate for the low power indication, the bias current will then stop increasing when it reaches biasmax value and continue to operate at that maximum value and apcfault asserted. biasmax also contro ls the bias current when the circuit is operating in the open loop mode. apc loop function at start up, with the driver enabled and burst mode enabled, the laser turns on within a few microseconds and its back facet monitoring photodiode starts to generat e a photocurrent proportional to the optical power. the photocurrent is fed back to the md pin on the driver where it?s converted to a voltage. the conversion voltage is compared to apcset on the driver. at equilibrium, the feedback voltage equals the apcs et voltage and the laser optical power reaches its nominal value. if the laser power deviates from its nominal value, the apc loop brings it back to its nominal setting. after everything is settled to its nominal value and the ben changes from high to low to disable the burst mode, the instantaneous bias current value is latched until ben switches from low to high again. then the bias and modulation output stages turn on and the bias stays equal to the stored value until the feedback from the monitoring pho todiode reaches the apcset value and the apc closed loop starts to regulate the laser power. apc loop failure the apcfault is asserted low if the bias current reaches biasmax or if the apc loop counter reaches its minimum or its maximum counts. interfacin g the driver with the laser diode as shown on the ?typical application? drawing, mod+ pin is connected to the laser cathode through a 10 ? resistor and mod - pin is connected to vcc with a 15 ? resistor equivalent to 10 ? (damping resistor) in series with the laser (equivalent resistor of 5 ? ). the laser can be driven differentially by connecting mod - to the anode of the laser through 15 ? (15 ? pull - up removed) and isolating the anode of the laser from vcc with an inductor. to meet the stringent laser turn - on tim e, per bpon/gpon/epon spec, the bias (bias+ pin) must be connected to the cathode of the laser through a resistor not an inductor as in continuous mode. bias - pin is pulled - up to vcc.
micrel, inc. s y88216l july 2008 8 m9999 - 071108-c hbwhelp@micrel.com or (408) 955 - 1690 typical characteristics
micrel, inc. s y88216l july 2008 9 m9999 - 071108-c hbwhelp@micrel.com or (408) 955 - 1690 functional characteristics
micrel, inc. s y88216l july 2008 10 m9999 - 071108-c hbwhelp@micrel.com or (408) 955 - 1690 input and output stages figure 1a. simplified input stage figure 1b. simplified ben input stage figure 1c. simplified output stage interfacing din and ben inputs to different logic drivers figure 2a. driving din and ben with pecl outputs figure 2b. driving din and ben with cml outputs figure 2c. driving ben with lvttl/lcmos outputs figure 2d. driving ben with lvds outputs
micrel, inc. s y88216l july 2008 11 m9999 - 071108-c hbwhelp@micrel.com or (408) 955 - 1690 package information 24- 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 reserves the right to change circuitry and specifications at any time without n otification 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 o r systems are devices or systems that (a) are intended 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 signific ant injury to the user. a purchaser?s use or sale of mi crel products for use in life support appliances, devices or systems is a purchaser?s own risk and purchaser agrees to fully indemnify micrel for any damages resulting from such use or sale. ? 2007 micrel, incorporated.

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