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general description the max3865 is designed for direct modulation of laser diodes at data rates up to 2.5gbps. it incorporates two feedback loops, the automatic power-control (apc) loop and the automatic modulation-control (amc) loop, to maintain constant average optical output and extinc- tion ratio over temperature and laser lifetime. external resistors or current output dacs may set the laser out- put levels. the driver can deliver up to100ma of laser bias current and up to 60ma laser modulation current with a typical (20% to 80%) edge speed of 84ps. the max3865 accepts differential clock and data input signals with on-chip 50 ? termination resistors. the inputs can be configured for cml or other high-speed logic. an input data-retiming latch can be enabled to reject input pattern-dependent jitter when a clock signal is available. the max3865 provides laser bias current and modulation current monitors, as well as a failure detector, to indicate the laser operating status. these features are all imple- mented on an 81mil ? 103mil die; the max3865 is also available as a 32-pin qfn package. applications sonet/sdh transmission systems add/drop multiplexers digital cross-connects section regenerators 2.5gbps optical transmitters features single +3.3v or +5v power supply 68ma supply current up to 2.5gbps (nrz) operation feedback control for constant average power feedback control for constant extinction ratio programmable bias current up to 100ma programmable modulation current up to 60ma 84ps rise/fall time selectable data retiming latch bias and modulation current monitors failure detector esd protection max3865 ? 2.5gbps laser driver with automatic modulation control ________________________________________________________________ maxim integrated products 1 ordering information 19-2247; rev 1; 4/02 for pricing, delivery, and ordering information, please contact maxim/dallas direct! at 1-888-629-4642, or visit maxim? website at www.maxim-ic.com. pin configuration appears at end of data sheet. part temp. range pin-package MAX3865Egj -40? to +85? 32 qfn MAX3865E/d -40? to +85? dice* ? covered by u.s. patent numbers 5,883,910, 5,850,409, and other patent pending. * dice are designed to operate from -40? to +85? , but are tested and guaranteed at t a = +25? only. contact factory for availability. max3865 max3892 50 ? data- data- 50 ? data+ data+ v dr v cr 50 ? clk+ clk+ 50 ? clk- clk- 2.5gbps serializer +3.3v +3.3v 200 ? 200 ? +3.3v led v cc rten en0 en1 biasmon modmon fail r modmax r biasmax r apcset r amcset gnd modmax biasmax apcset amcset 20 ? +3.3v 20 ? 20 ? 0.056 f 0.056 f 15 ? laser modn modq bias bias_x md md_x represents a controlled-impedance transmission line l p l p typical applications circuit
max3865 2.5gbps laser driver with automatic modulation control 2 _______________________________________________________________________________________ absolute maximum ratings electrical characteristics (v cc = +3.14v to +3.6v or +4.5v to +5.5v, t a = -40? to +85?. typical values are at v cc = +3.3v, i bias = 50ma, i mod = 30ma, t a = +25?, unless otherwise noted.) (notes 1, 2, 3) stresses beyond those listed under ?bsolute maximum ratings?may cause permanent damage to the device. these are stress rating s only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specificatio ns is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability. voltage at any pin...............................................................+7.0v supply voltage (v cc ) ............................................-0.5v to +7.0v voltage at v cr , v dr , data+, data-, clock+, and clock- pins ..................-0.5v to (v cc + 0.5v) voltage at data+ and data- pins ..................................(v dr - 1.2v) to (v dr + 1.2v) voltage at clk+ and clk- pins ......(v cr - 1.2v) to (v cr + 1.2v) voltage at modq and modn pins ................0v to (v cc + 1.5v) voltage at any other pins (rten, en0, en1, fail , modmax, biasmax, amcset, apcset, md_x, bias, bias_x, biasmon, modmon) ............-0.5v to (v cc + 0.5v) current into bias pin ......................................-20ma to +150ma current into modq and modn pins ..............-20ma to +100ma current into md pin...........................................-10ma to +10ma operating junction temperature .....................-55? to +150? storage temperature range .............................-55? to +150? continuous power dissipation (t a = +85?) 32-pin qfn (derate 21.2mw/? above +85?) ................1.3w lead temperature (soldering, 10s) .................................+300? processing temperature (die) .........................................+400? parameter symbol conditions min typ max units v cc = +3.14v to +3.6v (note 4) 68 85 power-supply current i cc v cc = +4.5v to +5.5v, typical current at v cc = +5.0v (note 4) 69 90 ma differential input voltage v id data and clock inputs (figure 2) 0.2 1.6 vp-p instantaneous input voltage data and clock inputs (figure 2) (note 5) 1.3 v cc + 0.4v v single-ended input resistance input to v dr , v cr 40 50 60 ? f 2.7ghz 20 input return loss, for data+, data-, clock+, and clock- rl in 2.7ghz < f < 4ghz 17 db bias-current setting range 1 100 ma bias off current en0, en1 = low 0.1 ma i bias = 100ma 15 % bias-current setting accuracy apc off i bias = 1ma 0.1 ma compliance voltage for bias and bias_x (note 5) 1 v cc + 0.4 v i bias to i biasmon ratio 48 m a/ma modulation-current setting range i mod 560ma modulation off current en0, en1 = low 0.1 ma i mod = 60ma 15 % modulation-current setting accuracy amc off i mod = 5ma 0.25 ma +3.14v v cc +3.6v 1.8 v cc + 1.2 compliance voltage for modq and modn (note 5) +4.5v v cc +5.5v 1.8 5.5 v i mod to i modmon ratio 32 m a/ma compliance voltage for biasmon and modmon (note 5) 1.8 v cc + 0.4 v voltage at md pin v md 1.0 v
max3865 2.5gbps laser driver with automatic modulation control _______________________________________________________________________________________ 3 electrical characteristics (continued) (v cc = +3.14v to +3.6v or +4.5v to +5.5v, t a = -40 c to +85 c. typical values are at v cc = +3.3v, i bias = 50ma, i mod = 30ma, t a = +25 c, unless otherwise noted.) (notes 1, 2, 3) parameter symbol conditions min typ max units i md = 1ma 15 % bias-setting accuracy at md pin i md = 36a 10 a i md = 1ma 15 % modulation-setting accuracy at md pin (note 6) i md = 36a 10 a en0, en1, and rten input high 2.0 v en0, en1, and rten input low 0.8 v fail output high source 50a 2.4 v fail output low sink 100a 0.4 v fail current low state, v ol forced to v cc 5.0 ma setup/hold time t su , t hd (figure 2) (note 5) 100 ps output edge speed t r , t f load = 20 ? , 20% to 80% (notes 5, 7) 84 130 ps output overshoot (notes 5, 7) 9 % enable/startup apc and amc off 150 ns maximum cid (notes 2, 5) 80 bit deterministic jitter (notes 2, 5) 22 50 psp-p random jitter (notes 5, 7) 1.6 ps rms amc pilot tone frequency f amc 1 mhz note 1: ac characterization performed using the circuit in figure 1. note 2: measured using a 2.5gbps 2 13 - 1 prbs with 80 0 s and 80 1 s input data pattern. note 3: specifications at -40 c are guaranteed by design and characterization. note 4: v cc current excludes the current into modq, modn, bias, bias_x, modmon, and biasmon pins. note 5: guaranteed by design and characterization. note 6: measured with low-frequency data. instantaneous current into md pin range is 36a to 1000a. note 7: measured using a 2.5gbps repeating 0000 0000 1111 1111 pattern.
max3865 2.5gbps laser driver with automatic modulation control 4 _______________________________________________________________________________________ 50 ? data- data- 50 ? data+ data+ v dr v cr 50 ? clk+- clk+ 50 ? clk- clk- pattern generator v cc max3865 v cc v cc v cc rten gnd en1 en0 v cc v cc modn modq bias bias_x 33 ? 50 ? 33 ? 50 ? 0.1 f 0.1 f oscilloscope figure 1. test circuit clk+ clk- data+ data- (data+) - (data-) i modq 5ma?0ma v id = 0.2vp-p?.6vp-p 1.3v 1.3v 0.1v?.8v 0.1v?.8v v cc + 0.4v v cc + 0.4v t su t hd figure 2. required input signal, setup/hold-time definition, and output polarity
max3865 2.5gbps laser driver with automatic modulation control _______________________________________________________________________________________ 5 typical operating characteristics (t a = +25 c, unless otherwise noted.) optical eye diagram (extinction ratio = 8.25db, 2 13 -1 prbs at 2.5gbps, 1.87ghz filter) max3865 toc01 58ps/div electrical eye diagram (i modq = 60ma) max3865 toc02 58ps/div pattern 2 13 - 1 prbs data rate = 2.5gbps electrical eye diagram (i modq = 30ma) max3865 toc03 58ps/div pattern 2 13 - 1 prbs data rate = 2.5gbps 50 60 55 70 65 75 80 -40 85 supply current (i cc ) vs. temperature (excludes bias and modulation currents) max3865 toc04 temperature ( c) supply current (ma) 10 -15 35 60 v cc = +3.3v v cc = +5.0v 0 30 20 10 50 40 90 80 70 60 100 -40 -20 0 20 40 60 80 deterministic jitter vs. temperature (i modq = 60ma) max3865 toc05 temperature ( c) deterministic jitter (ps) 0 10 5 20 15 25 30 100 106 108 102 104 110 112 114 116 118 120 typical distribution of rise time (worst-case conditions) max 3865 toc06 rise time (ps) percent of units (%) electrical measurement i modq = 60ma v cc = +3.14v t a = +85 c 0 10 5 20 15 25 30 102 100 108 110 104 106 112 114 116 118 120 typical distribution of fall time (worst-case conditions) max 3865 toc07 fall time (ps) percent of units (%) electrical measurement i modq = 60ma v cc = +3.14v t a = +85 c -35 -31 -33 -27 -29 -23 -25 -21 -17 -19 -15 0 1000 1500 500 2000 2500 3000 3500 4000 differential |s11| vs. frequency max3865 toc08 frequency (mhz) |s11| (db)
max3865 2.5gbps laser driver with automatic modulation control 6 _______________________________________________________________________________________ pin description pin name function 1, 8, 19, 22, 28 v cc positive supply voltage 2 data- complementary data input, with on-chip termination 3 data+ data input, with on-chip termination 4v dr termination reference voltage for data inputs 5v cr termination reference voltage for clock inputs 6 clk+ clock input for data retiming, with on-chip termination 7 clk- complementary clock input for data retiming, with on-chip termination 9, 16, 23, 24, 25 gnd no internal connection. tie to ground. 10 rten data retiming enable input, ttl compatible, active-high 11 en0 operating mode input, ttl compatible 12 en1 operating mode input, ttl compatible 13 fail fault warning, ttl compatible. low for fault condition. 14 biasmon bias-current monitor. open-collector type, tie to v cc if not used. 15 modmon modulation-current monitor. open-collector type, tie to v cc if not used. 17 bias_x bias shunt. always tie to the bias pin. 18 bias laser bias-current output. connect to the laser via an inductor. 20 modn modulation-current output to dummy load 21 modq modulation-current output to laser 26 md feedback input from monitor diode 27 md_x monitor diode shunt. connect to gnd when laser diode to monitor current gain 0.005. connect to the md pin for gain 0.02. for 0.005 < gain < 0.02 connect to either gnd or the md pin. 29 amcset monitor diode modulation-current (peak-to-peak) set point 30 apcset monitor diode bias-current (average) set point 31 modmax connect an external resistor to ground to program i mod in the manual and apc modes. the resistor sets the maximum i mod in amc mode. the amc loop may reduce i mod from its maximum but cannot add to it. 32 biasmax connect an external resistor to ground to program i bias in the manual mode. the resistor sets the maximum i bias in the apc and amc modes. the apc loop may reduce i bias from its maximum but cannot add to it. ep exposed paddle the exposed paddle and corner pins must be soldered to ground.
detailed description the max3865 laser driver consists of two main parts: a high-speed modulation driver and biasing block as shown in figure 4. outputs to the laser diode are a switched modulation current and a steady bias current. two servo loops may be enabled to control bias and modulation currents for constant optical power and extinction ratio. the max3865 requires a laser with a built-in monitor diode to provide feedback about the optical output. the average laser power, as sensed by the monitor diode, is controlled by the apc servo loop. peak-to- peak modulation current is controlled by the amc servo loop. the modulation output stage uses a programma- ble current source with a maximum current of 60ma. a high-speed differential pair switches this source to the laser diode. the clock and data inputs to the modula- tion driver may use cml, pecl, and other logic levels. the optional clock signal can be used to synchronize data transitions for minimum pattern-dependent jitter. clock/data input logic levels the max3865 is directly compatible with v cc -refer- enced cml. other logic interfaces are possible. for v cc -referenced cml or ac-coupled logic, tie v dr and v cr to v cc . for other dc-coupled differential signals, float v dr and v cr (figure 5). to prevent excess power dissipation in the input matching resistors, keep the instantaneous input voltage within 1.2v of v dr or v cr as specified in the electrical characteristics. optional input data retiming to eliminate pattern-dependent jitter in the input data, a synchronous differential clock signal should be con- nected to the clk+ and clk- inputs, and the rten control input should be tied high. input data retiming occurs on the rising edge of clk+. if rten is tied low, the retiming function is disabled and the input data is directly connected to the output stage. when no clock is available, tie clk+ to v cc , ground clk- through a 1.5k ? resistor, and leave v cr open. operating mode the max3865 can be set in four operating modes, depending on applications requirements. mode selec- tion is by two ttl-compatible inputs (see table 1). apc loop in apc mode, a servo loop maintains the average current from the monitor diode at a level set by the apcset input. laser bias current is varied in this mode to maintain the monitor diode current. the biasmax input must be set to a value larger than the maximum expected bias current. in this mode, biasmax limits the maximum bias current to the laser if the control loop fails. the fail pin will go low if average i md i apcset . mark-density compensation average power control assumes 50% mark density for times greater than about 100ns. for long patterns or sit- uations where 50% mark density does not apply, the max3865 provides mark-density compensation. the apcset reference is increased by an amount propor- tional to the mark density multiplied by the modulation amplitude. the amcset input is used as an estimate of the peak-to-peak modulation current when the mark density is not 50%. mark-density compensation is active in both apc and amc control modes. amc loop in amc mode, a servo loop maintains the peak-to-peak current from the monitor diode at a level set by the amcset input. laser modulation current is varied in this mode to maintain the monitor diode current. the modmax input must be set to a value larger than the maximum expected modulation current. in this mode, modmax limits the maximum modulation current to the laser if the control loop fails. the fail pin will go low if peak-to-peak i md i amcset . the apc loop is active when in the amc mode. in amc mode, mark-density compensation is automatic. max3865 2.5gbps laser driver with automatic modulation control _______________________________________________________________________________________ 7 en0 en1 operating mode description 0 0 shutdown bias and modulation currents off 0 1 manual biasmax programs laser bias, modmax programs modulation 1 0 apc apcset programs laser bias, modmax programs modulation 1 1 amc amcset programs modulation current and apcset programs bias table 1. mode selection
max3865 warning outputs a ttl-compatible, active-low warning flag, fail , is set when: one or more of the programmable currents is set at greater than 150% of the rated maximum for the chip. a shorted programming resistor would cause this warning. in this case, the bias and modulation outputs are shut down to protect the laser. average i md i apcset in the apc or amc mode. this could be caused by too low a setting for maximum i bias or by a laser that has exceeded its useful life. peak-to-peak i md i amcset in the amc mode. this could be caused by too low a setting for i modmax or by a laser which has exceeded its useful life. the fail flag also is set for a few microseconds follow- ing power-up, until the servo loops settle. the biasmon and modmon pins can be used to monitor the laser current and predict the end of the useful laser life before a failure occurs. design procedure when designing a laser transmitter, the optical output is usually expressed in terms of average power and extinction ratio. table 2 gives relationships that are helpful in converting between the optical power and the modulation current. these relationships are valid if the mark density and duty cycle of the optical waveform are 50%. for a desired laser average optical power, p avg , and optical extinction ratio, r e , the required modulation cur- rent can be calculated based on the laser slope effi- ciency, , using the equations in table 2. 2.5gbps laser driver with automatic modulation control 8 _______________________________________________________________________________________ max3865 data- data+ clk+ clk- +5v v cc rten en0 en1 r modmax r biasmax r apcset r amcset modmax biasmax apcset amcset 20 ? 20 ? 15 ? 20 ? modn modq bias bias_x md +5v i modq i bias i md figure 3. dc-coupled laser circuit parameter symbol relation average power p avg p avg = (p 0 + p 1 )/2 extinction ratio r e r e = p 1 / p 0 optical power of a 1 p 1 p 1 = 2p avg ? r e /( r e + 1) optical power of a 0 p 0 p 0 = 2p avg /( r e + 1) optical amplitude pp-p pp-p = p 1 - p 0 laser slope efficiency ? = pp-p/i mod laser to monitor diode transfer mon mon = i md / p avg table 2. optical power relations note: assuming a 50% average input duty cycle and mark density.
laser current requirements bias and modulation current requirements can be determined from the laser threshold current and slope efficiency. the modulation and bias currents under a single operating condition are: for dc-coupled laser diodes: i bias > i th where i th is the laser threshold current. for ac-coupled laser diodes: given the desired parameters for operation of the laser diode, the programming of the max3865 is explained in the following text. current limits to keep the modulation current in compliance with the programmed value, the following constraint on the total modulation current must be made: dc-coupled laser diodes: v cc - v diode - i mod ? (r d + r l ) - i bias ? r l 1.8v for v diode laser diode bias point voltage (1.2v typ) rl laser diode bias-point resistance (5 ? typ) rd series matching resistor (15 ? typ) ac-coupled laser diodes: to allow larger modulation current, the laser can be ac-coupled to the max3865 as shown in the typical application circuit . in this configuration, a constant cur- rent is supplied from the inductor l p . the requirement for compliance in the ac-coupled circuit is as follows: the ac-coupling capacitor and bias inductor form a second-order high-pass circuit. pattern-dependent jitter results from the low-frequency cutoff of this high-pass circuit. to prevent ringing: for deviation from 50% duty cycle or for runs of con- secutive identical digits (cid), the low-frequency corner formed by the lc circuit must be low enough to limit the droop. if droop = 6.7%, number_cid = 100 and data_rate = 2.5gbps, then possible values for l p and c may be l p = 6h and c = 0.056f. both l and c must be increased in value to reduce droop without ringing. programming the maximum bias current in amc (or apc) mode, the bias current needs a limit if the loop becomes open. r biasmax sets the maximum allowed bias current. the bias current is proportional to the current through r biasmax . an internal current regu- lator maintains the band-gap voltage of 1.2v across the programming resistors. select the maximum i bias pro- gramming resistor as follows: alternatively, a current dac forcing i dac from the biasmax pin may set the current maximum: i biasmax = 480 ? i dac when the amc or apc loop is enabled, the actual bias current is reduced below the maximum value to main- tain a constant average current from the monitor diode. with closed-loop control, the bias current will be deter- mined by the transfer function of the monitor diode to laser-diode current. for example, if the transfer function to the monitor diode is 10.0a/ma, then setting i md for 500a will result in i bias equal to 50ma. in manual mode, the bias current i bias is i biasmax as set by r biasmax . programming the average monitor diode-current set point the apcset pin controls the set point for the average monitor diode current when in amc or apc mode. the apcset current is externally established in the same manner as the biasmax pin. the average monitor diode current i md can be programmed with a resistor as follows: alternatively, a current dac at the apcset pin can set the monitor diode current by: average i md = 5 ? i dac average i v rk md apcset _ . = +? 5 12 2 i v rk biasmax biasmax = +? 480 12 2 . droop number cid data rate l c p = _ _ rr l c dl p + () ? 2 v i rr v cc mod dl ?+ () 2 18 . ii i bias th mod >+ 2 i pr r mod avg e e = ? + 2 1 1 max3865 2.5gbps laser driver with automatic modulation control _______________________________________________________________________________________ 9
max3865 mark-density compensation in apc mode when mark density is expected to deviate from 50% for periods exceeding 5% of the apc time constant, the amcset pin should be programmed to compensate the apc set point. the time constant is determined by the laser to monitor diode gain. (for example, apc = 150ns for g md = 0.01ma/ma.) set the estimated peak-to-peak monitor diode current by the following equation: alternatively, a current dac at the amcset pin can set the monitor diode current by: estimated i md(p-p) = 5 ? i dac programming the maximum modulation current in amc mode, the modulation current needs a limit if the loop becomes open. r modmax sets the maximum allowed modulation current. the modulation current is proportional to the current through r modmax . select the maximum i mod programming resistor as follows: alternatively, a current dac forcing i dac from the modmax pin may set the current maximum i modmax = 320 ? i dac when the amc loop is enabled, the actual modulation current is reduced from the maximum value to maintain constant peak-to-peak current from the monitor diode. with closed-loop control, the modulation current will be determined by the transfer function of the monitor diode to laser diode current. for example, if the transfer func- tion to the monitor diode is 10.0a/ma, then setting i md for 500a will result in i mod equal to 50ma. in manual mode, the modulation current i mod is set by r modmax . programming the peak-to-peak monitor diode-current set point the amcset pin controls the set point for the peak-to- peak monitor diode current in amc mode. the peak-to- peak value of the monitor diode current can be programmed with a resistor as follows: alternatively a current dac at the amcset pin can set the monitor diode current by: i md(p-p) = 5 ? i dac laser gain compensation the max3865 may be used in closed-loop operation with a wide variety of laser-to-monitor diode gains. table 3 shows the connection of the md_x pin for dif- ferent current-gain ranges. current monitor outputs the max3865 provides bias and modulation current monitors. the biasmon output sinks a current propor- tional to the bias current: the modmon pin sinks a current proportional to the laser modulation current: the biasmon and modmon pins should not be allowed to drop below 1.8v. they should be tied to v cc when not in use. i i modmon mod = 32 i i biasmon bias = 48 i v rk md p p amcset () . ? = +? 5 12 2 i v rk modmax modmax = +? 320 12 2 . estimated i v rk md p p amcset . () ? = +? 5 12 2 g i i md monitor laser = ? ? apc md ns g = 15 . 2.5gbps laser driver with automatic modulation control 10 ______________________________________________________________________________________ laser-to-monitor diode-current gain md_x shunt connection <0.005 gnd or open 0.005 to 0.02 (open or gnd) or md >0.02 md table 3. connection of the md_x pin
max3865 2.5gbps laser driver with automatic modulation control ______________________________________________________________________________________ 11 d q o 1 mux control logic shutdown overcurrent loop monitor rten data clk en0 en1 fail modulation control bias control x5 v bg r amcset x5 v bg r apcset v bg r modmax x480 v bg r biasmax monitor diode feedback x320 modn modq i modo i bias i md bias md c d r d 20 ? v cc max3865 + + - - figure 4. functional diagram v cc modq modn gnd i mod gnd v dr data+ data- 50 ? 50 ? v cc data and clock input circuits are equivalent gnd figure 5. equivalent input circuit figure 6. equivalent modulation output circuit
max3865 applications information layout considerations to minimize loss and crosstalk, keep the connections between the max3865 output and the laser diode as short as possible. use good high-frequency layout techniques and multilayer boards with uninterrupted ground plane to minimize emi and crosstalk. circuit boards should be made using low-loss dielectrics. use controlled-impedance lines for the clock and data inputs as well as the modulation output. references for further information, refer to the application notes for fiber optic circuits, hfan-02, on the maxim web page. laser safety and iec 825 using the max3865 laser driver alone does not ensure that a transmitter design is compliant with iec 825. the entire transmitter circuit and component selections must be considered. each customer must determine the level of fault tolerance required by their application, recognizing that maxim products are not designed or authorized for use as components in systems intended for surgical implant into the body, for applications intended to support or sustain life, or for any other appli- cation where the failure of a maxim product could create a situation where personal injury or death may occur. chip information transistor count: 1690 substrate connected to gnd process: bipolar die size: 81mil ? 103mil 2.5gbps laser driver with automatic modulation control 12 ______________________________________________________________________________________ 32 31 30 29 28 27 26 biasmax modmax apcset amcset v cc md_x md 25 gnd 9 10 11 12 13 14 15 gnd rten en0 en1 fail biasmon modmon 16 gnd 17 18 19 20 21 22 23 bias_x the exposed paddle must be soldered to supply ground on the circuit board bias v cc modn modq v cc gnd 8 7 6 5 4 3 2 v cc clk- clk+ v cr v dr data+ data- max3865 1 v cc 24 gnd top view pin configuration
max3865 2.5gbps laser driver with automatic modulation control ______________________________________________________________________________________ 13 bp8 v cc bp7 data- bp6 data+ bp5 v dr bp4 v cr bp3 clk+ bp2 clk- bp1 v cc bp21 n.c. bp22 n.c. bp23 v cc bp24 modq bp25 modn bp26 v cc bp27 bias bp28 bias_x bp9 n.c. bp10 gnd bp11 biasmax bp12 modmax bp13 apcset bp14 amcset bp15 v cc bp16 md_x bp17 md bp18 gnd bp19 n.c. bp20 n.c. bp40 gnd bp39 gnd bp38 rten bp37 en0 bp36 en1 bp35 gnd bp34 gnd bp33 bp32 biasmon bp31 modmon bp30 gnd bp29 gnd fail 81mil 2.06mm 103mil 2.62mm chip topography note: n.c. means no external connection permitted. leave these pads unconnected.
max3865 2.5gbps laser driver with automatic modulation control 14 ______________________________________________________________________________________ name pad coordinates (m) name pad coordinates (m) v cc bp1 46, 46 n.c. bp21 2382, 1423 clk- bp2 46, 241 n.c. bp22 2382, 1229 clk+ bp3 46, 435 v cc bp23 2382, 1034 v cr bp4 46, 629 modq bp24 2382, 840 v dr bp5 46, 824 modn bp25 2382, 646 data+ bp6 46, 1018 v cc bp26 2382, 451 data- bp7 46, 1213 bias bp27 2382, 257 v cc bp8 46, 1407 bias_x bp28 2382, 62 n.c. bp9 151, 1607 gnd bp29 2287, -153 gnd bp10 346, 1607 gnd bp30 2093, -153 biasmax bp11 540, 1607 modmon bp31 1898, -153 modmax bp12 735, 1607 biasmon bp32 1704, -153 apcset bp13 929, 1607 fail bp33 1510, -153 amcset bp14 1123, 1607 gnd bp34 1315, -153 v cc bp15 1318, 1609 gnd bp35 1121, -153 md_x bp16 1512, 1609 en1 bp36 926, -153 md bp17 1707, 1607 en0 bp37 732, -153 gnd bp18 1901, 1607 rten bp38 538, -153 n.c. bp19 2095, 1607 gnd bp39 343, -153 n.c. bp20 2290, 1607 gnd bp40 149, -153 pad coordinates coordinates are for the center of the pad. coordinate 0, 0 is the lower left corner of the passivation opening for pad 1.
max3865 2.5gbps laser driver with automatic modulation control ______________________________________________________________________________________ 15 package information
max3865 2.5gbps laser driver with automatic modulation control maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a maxim product. no circu it patent licenses are implied. maxim reserves the right to change the circuitry and specifications without notice at any time. 16 ____________________maxim integrated products, 120 san gabriel drive, sunnyvale, ca 94086 408-737-7600 ? 2002 maxim integrated products printed usa is a registered trademark of maxim integrated products. package information (continued)

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MAX3865EGJ 2156-MAX3865EGJ-ND	Maxim Integrated Products	LASER DRIVER	21: USD14.64	2602

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