View MAX3741HETEG16_6576495.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

general description the max3741 is a high-speed vcsel driver for small- form-factor (sff) and small-form-factor pluggable (sfp) fiber-optic lan transmitters. it contains a bias generator, laser modulator, and peaking current option to improve vcsel edge speed. the driver accommodates common cathode and differential configurations. the max3741 operates up to 3.2gbps. it can switch up to 15ma of laser modulation current and source up to 15ma of bias current. the max3741 is designed to inter- face with a digital potentiometer and control circuitry. the max3741 accommodates various vcsel packages, including low-cost to-46 headers. the max3741 is available in a compact 3mm x 3mm 16-pin thin qfn package and operates over a tempera- ture range of -40? to +85?. applications multirate (1gbps to 3.2gbps) sfp/sff modules gigabit ethernet optical transmitters fibre channel optical transmitters features ? 2ma to 15ma modulation current ? 1ma to 15ma bias current ? optional peaking current to improve vcsel edge speed ? supports common cathode and differential configuration ? 3mm 3mm 16-pin thin qfn package max3741 3.2gbps compact sfp vcsel driver ________________________________________________________________ maxim integrated products 1 exposed pad is connected to gnd. 16 1 2 3 4 12 11 10 9 15 14 13 5678 gnd v cc biasset bias biasmon out+ out- v cc in+ in- n.c. v cc modset peakset gnd tx_disable top view max3741 3mm x 3mm thin qfn pin configuration ordering information this symbol represents a transmission line of characteristic impedance zo = 50 ? . * ferrite bead, murata blm18hd102sn1b v cc peakset modset gnd in+ in- tx_disable r biasset r modset r peakset biasset +3.3v 0.01 f 0.1 f 0.1 f 0.01 f l1* bias out- out+ biasmon 50 ? 0.01 f max3741 r mon typical application circuit 19-2597; rev 2; 8/06 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. part temp range pin- package pkg. code max3741ete -40 c to +85 c 16 thi n qfn t1633f-3 max3741hete* -40 c to +85 c 16 thi n qfn t1633f-3 * hybrid lead-free package. see the hybrid lead-free package section.
max3741 3.2gbps compact sfp vcsel driver 2 _______________________________________________________________________________________ absolute maximum ratings electrical characteristics (v cc = +2.97v to +3.63v, t a = -40? to +85?. typical values are at v cc = +3.3v, t a = +25?, unless otherwise noted.) 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. supply voltage (v cc ) ............................................-0.5v to +5.0v voltage at tx_disable, in+, in-, modset, peakset, biasset, bias, biasmon .......-0.5v to (v cc + 0.5v) voltage at out+, out- .........................(v cc - 2v) to (v cc + 2v) current into out+, out- ....................................................60ma continuous power dissipation (t a = +85?) 16-lead thin qfn (derate 25mw/? above +85?) ..........2w operating temperature range .......................... -40? to +85? storage temperature range .............................-55? to +150? lead temperature (soldering, 10s) .................................+300? parameter symbol conditions min typ max units i mod = 2ma p-p 41 tx_disable set low, peaking is not used (note 1) i mod = 15ma p-p 51 65 i cc additional current when peaking is used (note 2) 14 20 supply current i cc-shdw total current when tx_disable is high 0.15 1 ma tx_disable input input impedance 80 105 k ? input high voltage v ih 2v input low voltage v il 0.8 v t_off time from rising edge of tx_disable to i bias = i bias_off and i mod = i mod_off (note 3) 0.2 3 tx_disable time t_on time from falling edge of tx_disable to i bias = 15ma and i mod = 15ma p-p 111 ? input leakage v cc = 0v and v tx_disable = 3.3v 25 40 ? bias generator (note 4) min 1 bias current i bias max 15 ma accuracy of programmed bias current ? i bias -8 +8 % bias current during disable i bias_off tx_disable high 10 ? biasmon gain 0.095 0.115 0.135 ma/ma laser modulator (note 5) data input voltage swing v id total differential signal 250 2200 mv p-p output resistance r out single-ended resistance at out+, out- 63 80 ? min 2 modulation current i mod max 15 ma p-p
max3741 3.2gbps compact sfp vcsel driver _______________________________________________________________________________________ 3 note 1: measured with r biasset = 1.87k ? (i bias 15ma). supply current excludes i bias . note 2: tested with r peak = 1.18k ? . note 3: guaranteed by design and characterization. note 4: v bias is less than v cc - 0.7v. note 5: measured electrically with a 50 ? load ac-coupled to out+. note 6: deterministic jitter is the peak-to-peak deviation from the ideal time crossings measured with a k28.5 bit pattern at 3.2gbps (00111110101100000101). electrical characteristics (continued) (v cc = +2.97v to +3.63v, t a = -40? to +85?. typical values are at v cc = +3.3v, t a = +25?, unless otherwise noted.) parameter symbol conditions min typ max units min 0.2 programmable peaking current i peak max 2 ma peaking current duration 80 ps tolerance of programmed modulation current -10 +10 % modulation transition time t r , t f 5ma p-p i mod 15ma p-p (note 3) 65 95 ps deterministic jitter dj 5ma p-p i mod 15ma p-p (notes 3, 6) 13 25 ps p-p random jitter rj (note 3) 1 4 ps rms laser modulation during disable i mod_off differential input voltage at 2200mv p-p 15 50 ? p-p differential input resistance 85 100 115 ? input bias voltage v in v cc - 0.3 v typical operating characteristics (v cc = +3.3v, t a = 25?, measured electrically with a 50 ? load ac-coupled to out+, unless otherwise noted.) electrical eye max3741 toc01 50ps/div 87mv/div 3.2gbps, k28.5, 10ma modulation, no peaking electrical eye with peaking max3741 toc02 50ps/div 87mv/div 3.2gbps, k28.5, 10ma modulation, r peakset = 2.4k ? electrical eye with peaking max3741 toc03 50ps/div 87mv/div 3.2gbps, k28.5, 10ma modulation, r peakset = 500 ?
max3741 3.2gbps compact sfp vcsel driver 4 _______________________________________________________________________________________ typical operating characteristics (continued) (v cc = +3.3v, t a = 25?, measured electrically with a 50 ? load ac-coupled to out+, unless otherwise noted.) optical eye at 2.125gbps max3741 toc04 68ps/div (e r = 8.8db, k28.5, 850nm vcsel, with 2.3ghz o-to-e converter) optical eye max3741 toc05 135ps/div (e r = 8.8db, 1.063gbps, k28.5, 850nm vcsel, with 2.3ghz o-to-e converter) deterministic jitter vs. i mod max3741 toc06 modulation current (ma p-p ) deterministic jitter (ps p-p ) 10 5 4 8 12 16 20 24 28 0 015 random jitter vs. i mod max3741 toc07 modulation current (ma p-p ) random jitter (ps rms ) 10 5 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 0 015 bias current vs. r biasset max3741 toc08 r biasset (k ? ) bias current (ma) 25 20 5 10 15 2 4 6 8 10 12 14 16 0 030 i mod vs. r modset max3741 toc09 r modset (k ? ) modulation current (ma p-p ) 10 8 2 4 6 2 4 6 8 10 12 14 16 0 012 i biasmon vs. bias current max3741 toc10 bias current (ma) i biasmon (ma) 12 8 4 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 0 016 input return loss max3741 toc11 frequency (hz) s 11 (db) 1g -30 -25 -20 -15 -10 -5 0 -35 100m 10g differential measurement output return loss max3741 toc12 frequency (hz) s 22 (db) 1g -18 -16 -14 -12 -10 -8 -6 -4 -2 0 -20 100m 10g
max3741 3.2gbps compact sfp vcsel driver _______________________________________________________________________________________ 5 typical operating characteristics (continued) (v cc = +3.3v, t a = 25?, measured electrically with a 50 ? load ac-coupled to out+, unless otherwise noted.) transition time vs. i mod max3741 toc13 i mod (ma) transition time (ps) 14 12 4 6 8 10 45 50 55 60 65 70 75 80 40 216 rise time fall time measured from 20% to 80% supply current vs. temperature max3741 toc14 temperature ( c) supply current (ma) 60 35 10 -15 20 30 40 50 60 70 80 10 -40 85 i mod = 2ma p-p power-supply rejection max3741 toc15 frequency (hz) psr (db) 10m 1m 100k 10k 1k -10 -8 -6 -4 -2 0 -12 100 100m psr = 20log ? v out ? v cc pin description pin name function 1 tx_disable transmit disable. driver output is disabled when tx_disable is high or left unconnected. the driver output is enabled when the pin is asserted low. 2 in+ noninverted data input 3 in- inverted data input 4 n.c. no connection 5, 9, 15 v cc +3.3v supply voltage 6 modset modulation set. a resistor connected from modset to ground (r modset ) programs the desired modulation current amplitude. 7 peakset peaking current set. a resistor connected between peakset and ground (r peakset ) programs the peaking current amplitude. to disable peaking, leave peakset open. 8, 16 gnd ground 10 out- inverted modulation-current output 11 out+ noninverted modulation-current output 12 biasmon bias current monitor. the output of biasmon is a sourced current proportional to the bias current. a resistor connected between biasmon and ground (r biasmon ) can be used to form a ground referenced bias monitor. 13 bias bias current output 14 biasset bias current set. a resistor connected between biasset and ground (r biasset ) programs the vcsel bias current. ep exposed pad ground. this must be soldered to the circuit board ground for proper thermal and electrical performance. see the layout considerations section.
max3741 detailed description the max3741 contains a bias generator and a laser modulator with optional peaking compensation. bias generator figure 1 shows the bias generator circuitry that con- tains a bandgap voltage reference, current mirror, and bias monitor. the bias current output to the laser is controlled with the r biasset resistor. for appropriate r biasset values, see the bias current vs. r biasset graph in the typical operating characteristics . the biasmon output provides a current proportional to the laser bias current given by: i biasmon = i bias / 9 modulation circuit the modulation circuitry consists of an input buffer, a cur- rent mirror, and a high-speed current switch (figure 2). the modulators drive up to 15ma of modulation into a 50 ? vcsel load. the amplitude of the modulation current is set with resis- tor at modset (r modset ). for appropriate r modset values, see the i mod vs. r modset graph in the typical operating characteristics . figure 3 shows a simplified diagram of the max3741 output stage. input termination the max3741 data inputs are sfp msa compatible. on-chip 100 ? differential input impedance is provided for optimal termination (figure 4). the max3741 inputs self-bias to the proper operating point to accommodate ac-coupling. applications information vcsel selection select a communications-grade vcsel with a rise time of 260ps or better for 1.25gbps or 130ps or better for 2.5gbps applications. use a high-efficiency vcsel that requires low modula- tion current and generates a low voltage swing. trim the leads to reduce vcsel package inductance. the typical package leads have inductance of 25nh per inch (1nh/mm). this inductance causes a large voltage swing across the vcsel. a compensation filter network can be used to reduce ringing, edge speed, and voltage swing. see the designing the laser-compensation filter network section for more information. layout considerations to minimize inductance, keep the connections between the max3741 output pins and vcsel as close as pos- sible. use good high-frequency layout techniques and multiple-layer boards with uninterrupted ground planes to minimize emi and crosstalk. 3.2gbps compact sfp vcsel driver 6 _______________________________________________________________________________________ functional diagram tx_disable v cc in+ in- out- out+ modulation-current generator bias generator enable enable 100 ? laser modulator peaking control bias biasset biasmon peakset modset max3741 r out r out biasset 0.8v current amplifier enable 200 ? r biasset bias generator r biasmon biasmon ferrite bead bias i bias 40 i bias 9 max3741 figure 1. bias generator
designing the compensation filter network vcsel package inductance causes the vcsel imped- ance to increase at high frequencies, leading to ring- ing, overshoot, and degradation of the vcsel output. a vcsel compensation filter network can be used to reduce the vcsel impedance at high frequencies, thereby reducing output ringing and overshoot. the compensation components (r f and c f ) are most easily determined by experimentation. begin with r f = 50 ? and c f = 1pf. increase c f until the desired trans- mitter response is obtained (figure 5). refer to application note hfan-2.0: interfacing maxim laser drivers with laser diodes for more information. exposed-pad (ep) package the exposed pad on the 16-pin thin qfn provides a very low thermal resistance path for heat removal from the ic. the pad is electrical ground on the max3741 and must be soldered to the circuit board ground for proper thermal and electrical performance. refer to maxim application note hfan-08.1: thermal considerations for qfn and other exposed pad packages , for additional information. max3741 3.2gbps compact sfp vcsel driver _______________________________________________________________________________________ 7 v cc in+ in- out- out+ peakset current amplifier 34x enable 100 ? r out modulation current generation peaking control current switch r modset input buffer modset max3741 r peakset 1.0v r out figure 2. modulation circuit max3741 in+ in- 1nh 1nh 0.5pf 0.5pf v cc 50 ? 50 ? 16k ? 24k ? v cc v cc package figure 4. simplified input structure v cc max3741 package 1nh 1nh 0.5pf 0.5pf out- out+ r out r out figure 3. simplified output structure
max3741 3.2gbps compact sfp vcsel driver 8 _______________________________________________________________________________________ laser safety and iec 825 the international electrotechnical commission (iec) determines standards for hazardous light emissions from fiber-optic transmitters. iec 825 defines the maxi- mum light output for various hazard levels. using this 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. customers must determine the level of fault tolerance required by their applications, 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 application where the fail- ure of a maxim product could create a situation where personal injury or death may occur. hybrid lead-free package the max3741hete is a max3741 in a hybrid lead-free package. it is a hybrid part that contains high-lead bumps inside a lead-free thin qfn package. the part is not 100% lead free; however, the high-lead solder in the internal portion of the part does meet the rohs exemption for high-lead solders. for more information, visit www.maxim-ic.com/emmi. time power uncompensated correctly compensated overcompensated figure 5. laser compensation chip information transistor count: 1597 process: sige bipolar
max3741 3.2gbps compact sfp vcsel driver _______________________________________________________________________________________ 9 package information (the package drawing(s) in this data sheet may not reflect the most current specifications. for the latest package outline info rmation go to www.maxim-ic.com/packages .) 12x16l qfn thin.eps 0.10 c 0.08 c 0.10 m c a b d d/2 e/2 e a1 a2 a e2 e2/2 l k e (nd - 1) x e (ne - 1) x e d2 d2/2 b l e l c l e c l l c l c package outline 21-0136 2 1 g 8, 12, 16l thin qfn, 3x3x0.8mm marking aaaa
max3741 3.2gbps compact sfp vcsel driver 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. 10 ____________________maxim integrated products, 120 san gabriel drive, sunnyvale, ca 94086 408-737-7600 2006 maxim integrated products is a registered trademark of maxim integrated products. package information (continued) (the package drawing(s) in this data sheet may not reflect the most current specifications. for the latest package outline info rmation go to www.maxim-ic.com/packages .) exposed pad variations 1.10 t1633-1 0.95 codes pkg. t1233-1 min. 0.95 nom. 1.10 d2 1.25 1.10 0.95 1.25 nom. 1.10 max. 1.25 min. 0.95 max. 1.25 e2 12 n k a2 0.25 ne a1 nd 0 0.20 ref - - 3 0.02 3 0.05 l e e 0.45 2.90 b d a 0.20 2.90 0.70 0.50 bsc. 0.55 3.00 0.65 3.10 0.25 3.00 0.75 0.30 3.10 0.80 16 0.20 ref 0.25 - 0 4 0.02 4 - 0.05 0.50 bsc. 0.30 2.90 0.40 3.00 0.20 2.90 0.70 0.25 3.00 0.75 3.10 0.50 0.80 3.10 0.30 pkg ref. min. 12l 3x3 nom. max. nom. 16l 3x3 min. max. 0.35 x 45 pin id jedec weed-1 0.35 x 45 weed-2 t1233-3 1.10 1.25 0.95 1.10 0.35 x 45 1.25 weed-1 0.95 t1633f-3 0.65 t1633-4 0.95 0.80 0.95 0.65 0.80 1.10 1.25 0.95 1.10 0.225 x 45 0.95 weed-2 0.35 x 45 1.25 weed-2 t1633-2 0.95 1.10 1.25 0.95 1.10 0.35 x 45 1.25 weed-2 no down bonds allowed yes no yes n/a no package outline 21-0136 2 2 g 8, 12, 16l thin qfn, 3x3x0.8mm yes weed-1 1.25 1.10 0.95 0.35 x 45 1.25 1.10 0.95 t1233-4 t1633fh-3 0.65 0.80 0.95 0.225 x 45 0.65 0.80 0.95 weed-2 n/a notes: 1. dimensioning & tolerancing conform to asme y14.5m-1994. 2. all dimensions are in millimeters. angles are in degrees. 3. n is the total number of terminals. 4. the terminal #1 identifier and terminal numbering convention shall conform to jesd 95-1 spp-012. details of terminal #1 identifier are optional, but must be located within the zone indicated. the terminal #1 identifier may be either a mold or marked feature. 5. dimension b applies to metallized terminal and is measured between 0.20 mm and 0.25 mm from terminal tip. 6. nd and ne refer to the number of terminals on each d and e side respectively. 7. depopulation is possible in a symmetrical fashion. 8. coplanarity applies to the exposed heat sink slug as well as the terminals. 9. drawing conforms to jedec mo220 revision c. 10. marking is for package orientation reference only. 11. number of leads shown are for reference only. 0.25 0.30 0.35 2 0.25 0 0.20 ref -- 0.02 0.05 0.35 8 2 0.55 0.75 2.90 2.90 3.00 3.10 0.65 bsc. 3.00 3.10 8l 3x3 min. 0.70 0.75 0.80 nom. max. tq833-1 1.25 0.25 0.70 0.35 x 45 no weec 1.25 0.70 0.25 revision history rev 0; 10/02: initial data sheet release. rev 1; 5/04: added package code (page 1); added package drawing (page 9). rev 2; 8/06: added hybrid package ordering information (pages 1 and 8).
e nglish ? ???? ? ??? ? ??? what's ne w p roducts solutions de sign ap p note s sup p ort buy comp any me mbe rs max3741 part number table notes: see the max3741 quickview data sheet for further information on this product family or download the max3741 full data sheet (pdf, 292kb). 1. other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales . 2. didn't find what you need? ask our applications engineers. expert assistance in finding parts, usually within one business day. 3. part number suffixes: t or t&r = tape and reel; + = rohs/lead-free; # = rohs/lead-exempt. more: see full data sheet or part naming c onventions . 4. * some packages have variations, listed on the drawing. "pkgc ode/variation" tells which variation the product uses. 5. part number free sample buy direct package: type pins size drawing code/var * temp rohs/lead-free? materials analysis max3741hete#tg16 thin qfn;16 pin;3x3x0.8mm dwg: 21-0136i (pdf) use pkgcode/variation: t1633fh-3 * -40c to +85c rohs/lead-free: yes materials analysis max3741ete thin qfn;16 pin;3x3x0.8mm dwg: 21-0136i (pdf) use pkgcode/variation: t1633f-3 * -40c to +85c rohs/lead-free: no materials analysis max3741ete-t thin qfn;16 pin;3x3x0.8mm dwg: 21-0136i (pdf) use pkgcode/variation: t1633f-3 * -40c to +85c rohs/lead-free: no materials analysis max3741hete#g16 thin qfn;16 pin;3x3x0.8mm dwg: 21-0136i (pdf) use pkgcode/variation: t1633fh-3 * -40c to +85c rohs/lead-free: yes materials analysis didn't find what you need? c ontac t us: send us an email c opyright 2 0 0 7 by m axim i ntegrated p roduc ts , dallas semic onduc tor ? legal n otic es ? p rivac y p olic y

▲Up To Search▲

Price & Availability of MAX3741HETEG16

	To Download MAX3741HETEG16 Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .