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general description the max3658 is a transimpedance preamplifier forreceivers operating up to 622mbps. low noise, high gain, and low power dissipation make it ideal for fiber access and small form-factor transceivers. the max3658 features 45na input-referred noise, 18k transimpedance gain, 580mhz bandwidth, and 2ma p-p input overload. operating from a +3.3v supply, themax3658 consumes only 66mw. an integrated filter resistor provides positive bias for the photodiode. these features, combined with a small die size, allow easy assembly into a to-46 header with a photodiode. the max3658 also includes an average photocurrent monitor. the max3658 has typical optical sensitivity of -33dbm (0.9a/w), which exceeds the class-b apon require- ments. typical optical overload is 1dbm. the max3658 is available in die form with both output polarities (max3658a and max3658b). the max3658a is also available in a 3mm x 3mm 8-pin tdfn package. applications optical receivers (up to 622mbps operation)passive optical networks sff/sfp transceivers fttx transceivers features ? 45na rms noise, -33dbm sensitivity ? 18.3k transimpedance gain ? 580mhz bandwidth ? 2ma p-p input overload, 1dbm overload ? 66mw power dissipation ? 3.3v operation ? average photocurrent monitor max3658 622mbps, low-noise, high-gain transimpedance preamplifier ___________________________________________________ _____________ maxim integrated products 1 ordering information c filt max3658 r filt out+ out- filt in gnd mon c vcc2 c vcc1 r mon +3.3v 75 * 75 * 0.1 f 0.1 f c out * 25 * 25 * 100 limiting amplifier max3748 *optional components 5-pin to-46 header typical operating circuit 19-3015; rev 3; 2/07 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. + denotes lead-free package. * dice are designed to operate over a -40? to +100? junction temperature (t j ) range, but are tested and guaranteed at t a = +25?. par emp range pin- package pkg code max3658aeta -40 c to +85 c 8 tdfn (3mm x 3mm) t833-3 max3658aeta+ -40 c to +85 c 8 tdfn (3mm x 3mm) t833-3 max3658ae/d dice* max3658be/d dice* pin configuration appears at end of data sheet. downloaded from: http:///
max3658 622mbps, low-noise, high-gain transimpedance preamplifier 2 __________________________________________________ _____________________________________ absolute maximum ratings dc electrical characteristics (v cc = +2.97v to +3.63v, 150 load between out+ and out-, t j = -40? to +100?. typical values are at v cc = +3.3v and t a = +25?, unless otherwise noted.) stresses beyond those listed under ?bsolute maximum ratings?may cause permanent damage to the device. these are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability. note 1: accuracy is defined as 10 log (i mon / i in ). supply voltage (v cc ) ............................................-0.5v to +4.2v current into in ....................................................................+5ma voltage at out+, out- ...................(v cc - 1.2v) to (v cc + 0.5v) voltage filt, mon .....................................-0.5v to (v cc + 0.5v) continuous power dissipation (t a = +85?) 8-lead tdfn (derate 24.4mw/? above +85?) ......1951.2mw operating temperature range ...........................-40? to +85? operating junction temperature range (die) ....-40? to +150? storage temperature range .............................-55? to +150? die attach temperature...................................................+400? lead temperature (soldering, 10s) .................................+300? parameter symbol conditions min typ max units supply current i cc 20 26 ma input bias voltage v in i in = 1? 0.83 1.0 v transimpedance linear range 0.95 < linearity < 1.05 4 a p-p small-signal transimpedance z 21 i in < 2? p-p 15.7 18.3 20.9 k output common-mode voltage ac-coupled output v cc - 0.125 v differential output offset ? v out i in = 1.3ma 2m v output impedance z out single ended 60 75 90 maximum output voltage v out ( max ) i in = 2ma p-p 150 240 400 mv p-p i in = 4? 15 20 25 k filter resistor r filt i in = 1.3ma 300 500 700 offset-correction disablethreshold voltage applied at filt 0.4 v input resistance filt = 0v 400 nominal mon current gain g mon i mon / i in (i in = 1ma, 3.3v, +25?) 0.8 1 1.2 a/a mon output voltage range v mon 0 2.2 v 1? i in < 2? -2.5 +2.5 2? i in < 5? -2 +2 mon accuracy (note 1) 5? i in < 1ma -1.5 +1.5 db downloaded from: http:///
max3658 622mbps, low-noise, high-gain transimpedance preamplifier ___________________________________________________ ____________________________________ 3 ac electrical characteristics (v cc = +2.97v to +3.63v, 150 load between out+ and out-, c in = 0.5pf total, c filt = 400pf, c vcc2 = 1nf, t j = -40? to +100?, t a = -40? to +85?. typical values are at v cc = +3.3v and t a = +25?, unless otherwise noted. ac characteristics are guaranteed by design and characterization.) note 2: -3db bandwidth is measured relative to the gain at 10mhz. note 3: measured using a pattern equivalent to 2 23 - 1 prbs with 72 cids at 622mbps. parameter symbol conditions min typ max units bandwidth bw (note 2) 435 580 mhz input-referred noise i n bw = 467mhz 45 55 na rms noise density bw = 467mhz 2.1 pa/ hz low-frequency cutoff i in = 1? 30 khz 2? p-p i in < 10? p-p 150 deterministic jitter (note 3) dj 10? p-p i in < 2ma p-p 260 ps p-p 1.0a/w photodiode at 622 mbps +1 optical overload pin(max) 1.0a/w photodiode at 155 mbps -7.2 dbm optical sensitivity pin(min) 0.9a/w photodiode -33 dbm typical operating characteristics (v cc = +3.3v, c in = 0.5pf, t a = +25?, unless otherwise noted.) small-signal transimpedance vs. temperature max3658 toc01 ambient temperature ( c) transimpedance (k ) 80 60 40 20 0 -20 16 17 18 19 2015 -40 100 supply current vs. temperature max3658 toc02 ambient temperature ( c) supply current (ma) 80 60 40 20 0 -20 18 21 24 27 3015 -40 100 monitor current vs. dc input current max3658 toc03 dc input current ( a) monitor current ( a) 100 10 1 1 10 100 1000 0.1 0.1 1000 downloaded from: http:///
max3658 622mbps, low-noise, high-gain transimpedance preamplifier 4 __________________________________________________ _____________________________________ typical operating characteristics (continued) (v cc = +3.3v, c in = 0.5pf, t a = +25?, unless otherwise noted.) filter voltage vs. dc input current max3658 toc04 dc input current ( a) filter voltage (mv) 1000 100 10 200 400 600 800 1000 1200 1400 1600 0 1 10,000 r filt = 500 r filt = 20k deterministic jitter vs. input current amplitude max3658 toc05 input current ( a p-p ) deterministic jitter (ps) 1000 100 10 25 30 35 40 45 50 55 60 65 7020 1 10,000 see note 3 1000 1 1 100 1000 small-signal low-frequency cutoff vs. dc input current 10 100 max3658 toc06 dc input current ( a) low-frequency cutoff (khz) 10 differential output voltage vs. input current max3658 toc07 input current ( a p-p ) differential output voltage (mv p-p ) 25 20 15 10 5 50 100 150 200 250 0 03 0 frequency response frequency (hz) transimpedance (db ) 9060 65 70 8580 75 1k 10m 100k 10k 1m 100m 1g 10g max3658 toc08 20 log (v out / i in ) bandwidth vs. input capacitance max3658 toc09 input capacitance (pf) bandwidth (mhz) 1.2 0.9 0.6 0.3 200 400 600 800 1000 1200 0 0 1.5 temp = +25 c input-referred rms noise vs. input capacitance max3658 toc10 input capacitance (pf) input-referred noise (na rms ) 1.2 0.9 0.3 0.6 20 30 40 50 60 7010 0 1.5 temp = +110 c temp = +25 c i in = 0 a 467mhz bandwidth temp = -40 c input-referred rms noise vs. dc input current max3658 toc11 dc input current ( a) input-referred noise (na rms ) 10 1 50 100 150 250 350300 200 0 0.1 100 output eye diagram (2 a electrical input) max3658 toc12 4.8mv/div 330ps/div 2 a 2 31 - 1 prbs input at 622.08mbps downloaded from: http:///
max3658 622mbps, low-noise, high-gain transimpedance preamplifier _______________________________________________________________________________________ 5 output eye diagram (-28dbm optical input) max3658 toc13 4.5mv/div 300ps/div 2 31 - 1 prbs input at 622mbps output eye diagram (0dbm optical input) max3658 toc14 20mv/div 200ps/div 2 31 - 1 prbs input at 622mbps typical operating characteristics (continued) (v cc = +3.3v, c in = 0.5pf, t a = +25?, unless otherwise noted.) pin description pin name function 1v cc +3.3v supply voltage 2 in signal input. connect to photodiode anode. 3 filt optional filter connection. use to bias the photodiode cathode. an internal on-chip resistive networkis connected between this pin and v cc ; an external decoupling capacitor connected to this pin forms a filter (see the design procedure section). leave this pin open if a filter is not required. 4 mon optional photocurrent monitor. this is a current output. connect a resistor between mon and groundto monitor the average photocurrent. leave this pin open if a monitor is not required. 5, 8 gnd circuit ground 6 out+ positive 75 data output. increasing input current causes out+ to increase. 7 out- negative 75 data output. increasing input current causes out- to decrease. downloaded from: http:///
max3658 detailed description the max3658 transimpedance amplifier is designed for622mbps fiber optic applications. the max3658 is comprised of a transimpedance amplifier, a voltage amplifier, an output buffer, a dc cancellation circuit, and a photocurrent monitor. transimpedance amplifier the signal current at the input flows into the summingnode of a high-gain amplifier. shunt feedback through resistor r f converts this current into a voltage. schottky diodes clamp the output signal for large input currents(figure 1). voltage amplifier the voltage amplifier provides additional gain and con-verts the transimpedance amplifier single-ended output into a differential signal. 622mbps, low-noise, high-gain transimpedance preamplifier 6 __________________________________________________ _____________________________________ lowpass filter max3658 voltage amplifier output buffer tia r f en v cc dc cancellation r out r out in mon filt out+ out- resistive network functional diagram amplitude output (large signals) time output (small signals) figure 1. max3658 limited output downloaded from: http:///
output buffer the output buffer is designed to drive a 150 differen- tial load between out+ and out-. for optimum supplynoise rejection, the max3658 should be terminated with a differential load. the max3658 single-ended outputs do not drive a dc-coupled grounded load. the outputs should be ac-coupled or terminated to v cc . if a single- ended output is required, both the used and the unusedoutputs should be terminated in a similar manner (see the interface schematics section). dc cancellation circuit the dc cancellation circuit uses low-frequency feed-back to remove the dc component of the input signal (figure 2). this feature centers the input signal within the transimpedance amplifier? linear range, thereby reducing pulse-width distortion. the dc cancellation circuit is internally compensated and does not require external capacitors. this circuit minimizes pulse-width distortion for data sequences that exhibit a 50% mark density. a mark density signifi- cantly different from 50% causes the max3658 to gen- erate pulse-width distortion. grounding the filt pin disables the dc cancellation circuit. for normal opera- tion, the dc cancellation circuit must be enabled. the dc cancellation current is drawn from the input and creates noise. for low-level signals with little or no dc component, the added noise is insignificant. however, amplifier noise increases for signals with significant dc component (see the typical operating characteristics ). photocurrent monitor the max3658 includes an average photocurrent moni-tor. the current sourced from mon to ground is approxi- mately equal to the dc current at in. design procedure select photodiode noise performance and bandwidth are adversely affectedby capacitance on the tia input node. select a low- capacitance photodiode to minimize the total input capac- itance on this pin. the max3658 is optimized for 0.5pf of capacitance on the input. assembling the max3658 in die form using chip and wire technology provides the lowest capacitance input and the best possible performance. select c filt supply voltage noise at the cathode of the photodiodeproduces a current i = c pd dv/dt, which reduces the receiver sensitivity (c pd is the photodiode capaci- tance). the filter resistor of the max3658 combinedwith an external capacitor, can be used to reduce the effect of supply noise on performance (see the typical operating circuit ). current generated by supply noise voltage is divided between c filt and c pd . to obtain a good optical sensitivity select c filt 400pf. select supply filter sensitive optical receivers require wide-band power-supply decoupling. power-supply bypassing should provide low impedance between v cc and ground for frequencies between 10khz and 700mhz. isolate themax3658 from noise sources with lc supply filters and shielding. place a supply filter (c vcc2 ) as close to the max3658 as possible. select r mon if photocurrent monitoring is desired, connect a resistorbetween mon and ground to monitor the average pho- tocurrent. select r mon as large as possible: where i monmax is the largest average input current observed. an ammeter can also monitor the current outof the mon pin. select coupling capacitors a receiver built with the max3658 will have a bandpassfrequency response. the low-frequency cutoff due to the coupling capacitors and load resistors is: lfc rc term load couple = 1 2 r v i mon monmax . = 22 max3658 622mbps, low-noise, high-gain transimpedance preamplifier ___________________________________________________ ____________________________________ 7 amplitude input from photodiode time input after dc cancellation figure 2. dc cancellation effect on input downloaded from: http:///
max3658 select c couple so the low-frequency cutoff due to the load resistors and coupling capacitors is much lowerthan the low-frequency cutoff of the max3658. the cou- pling capacitor should be 0.1? or larger for sonet data. for lowest jitter, 1.0? is recommended. refer to application note hfan-01.1: choosing ac-coupling capacitors for a more detailed discussion on choosing ac-coupling capacitors. select output filter input sensitivity is improved by adding a filter betweentia and the quantizer/limiting amplifier, with 0.5pf input capacitance. typical bandwidth of the max3658 is 580mhz; the highest expected bandwidth is 730mhz. layout considerations figure 3 shows suggested layouts for 4- and 5-pin toheaders. wire bonding for high-current density and reliable operation, themax3658 uses gold metalization. for best results, use gold-wire ball-bonding techniques. use caution when wedge bonding. die-size is 52 mils x 29 mils, (1.32mm x 0.736mm) and die thickness is 15 mils (380?). the bond-pad passivation opening is 75? and bond-pad metal thickness is 5?. refer to maxim application note hfan-08.0.1: understanding bonding coordinates and physical die size for additional information on bond- pad coordinates. applications information optical power relations many of the max3658 specifications relate to the inputsignal amplitude. when working with optical receivers, the input is sometimes expressed in terms of average optical power and extinction ratio. figure 4 and table 1 show relations that are helpful for converting optical power to input signal when designing with the max3658. optical sensitivity calculation the input-referred rms noise current (i n ) of the max3658 generally determines the receiver sensitivity.to obtain a system bit-error rate (ber) of 1e-10, the signal-to-noise ratio must always exceed 12.7. the input sensitivity, expressed in average power, can be estimated as: sensitivity ir r dbm ne e log . = + () () ? ? ? ? ? ? ? ? 10 12 7 1 21 1000 622mbps, low-noise, high-gain transimpedance preamplifier 8 __________________________________________________ _____________________________________ 5-pin header4-pin header photodiode mounted on c filt output polaritiesreversed for max3658b case is ground photodiode mounted on c filt output polaritiesreversed for max3658b case is ground photodiode gnd gnd max3658a filt in mon photodiode max3658a filt in mon c vcc1 v cc out- out+ v cc out- mon out+ c vcc1 figure 3. suggested to header layouts table 1. optical power relations* parameter symbol relation average power p avg p pp avg = + 01 2 extinction ratio r e r p p e = 1 0 optical power of a 1 p1 pp r r avg e e 12 1 = + optical power of a 0 p0 p p r avg e 0 2 1 = + optical modulationamplitude p in ppp p rr in avg ee = = + 10 2 1 1 * assuming a 50% average mark density. downloaded from: http:///
where is the photodiode responsivity in a/w and i n is the rms noise current in amps. for example, with pho-todiode responsivity of 0.9a/w, an extinction ratio of 10 and 45na input-referred noise, the sensitivity of the max3658 is: actual results may vary depending on supply noise, output filter, limiting amplifier sensitivity, and other fac- tors (refer to application note hfan-03.0.0: accurately estimating optical receiver sensitivity ). maxim obtains -33dbm typ sensitivity combined withthe max3748. input optical overload overload is the largest input that the max3658 acceptswhile meeting the pulse-width distortion specification. optical overload can be estimated in terms of average power with the following equation: for example, if photodiode responsivity is 1.0a/w, the input overload is 0dbm. optical linear range the max3658 has high gain, which limits the output forlarge input signals. the max3658 operates in a linear range for inputs not exceeding: for example, with photodiode responsivity of 0.9a/w and an extinction ratio of 10, the linear range is: interface schematics equivalent output interface the max3658 has a differential output structure with75 termination (150 differential). figure 5 is a simpli- fied diagram of the output interface. common testequipment is designed with a 50 single-ended termi- nation (100 differential). figures 6a and 6b show alter- nate interface schemes for the max3658. linearrange a dbm dbm log . = ? ? ? ? ? ? = 10 41 1 2099 1000 25 linear range ar r dbm e e log = + () () ? ? ? ? ? ? ? ? 10 41 21 1000 overload ma dbm log = ? ? ? ? ? ? 10 2 2 1000 sensitivity na aw dbm dbm log . ./ = ? ? ? ? ? ? = 10 12 7 45 11 209 9 1000 34 max3658 622mbps, low-noise, high-gain transimpedance preamplifier ___________________________________________________ ____________________________________ 9 p0 p1 p avg time optical power figure 4. optical power relations out+ out- v cc v cc v cc r out 75 r out 75 figure 5. equivalent output interface downloaded from: http:///
max3658 622mbps, low-noise, high-gain transimpedance preamplifier 10 _________________________________________________ _____________________________________ output stage 75 *component not required if l < 5cm v cc l 150 ? 150 ? 50 ? 50 ? 75 max3658 50 50 differential input stage 0.1 f 0.1 f figure 6a. 50 ac-coupled interface output stage 75 note: the parallel combination at the unused output can be replaced by a single equivalent 37.5 resistor. *component not required if l < 5cm l 150 ? 150 ? 50 ? 75 v cc 50 max3658 50 single-ended input stage figure 6b. 50 dc-coupled single-ended output interface downloaded from: http:///
pad coordinates table 2 gives center pad coordinates for the max3658bond pads. refer to application note hfan-08.0.1: understanding bonding coordinates and physical die size for more information on bond-pad coordinates. max3658 622mbps, low-noise, high-gain transimpedance preamplifier ___________________________________________________ ___________________________________ 11 filt 20k 400 v cc 20pf figure 7. filt interface mon v cc figure 8. mon interface table 2. bond-pad information name coordinates (?) pad max3658a max3658b x y bp1 mon mon 16.6 818.6 bp2 gnd gnd 18.0 543.4 bp3 n.c. n.c. 18.0 425.8 bp4 out+ out- 16.6 39.4 bp5 out- out+ 445.0 39.4 bp6 n.c. n.c. 456.2 155.6 bp7 gnd gnd 455.0 565.8 bp8 v cc v cc 455.0 818.6 bp9 in in 254.6 818.6 bp10 filt filt 135.6 818.6 chip information transistor count: 833process: gst-4 top view max3658 agp** filt in out+ mon gnd out- gnd 1234 8765 v cc tdfn* (3mm x 3mm) *the exposed pad must be connected to circuit boardground for proper thermal and electrical performance. **agp = device topmark. pin configuration downloaded from: http:///
max3658 622mbps, low-noise, high-gain transimpedance preamplifier 12 _________________________________________________ _____________________________________ 12 3 4 10 9 8 75 mon gnd n.c. out+ v cc gnd n.c. out- filt in 0.052in 1.32mm 0.029in 0.736mm (0,0) 6 chip topographies topography for max3658a downloaded from: http:///
max3658 622mbps, low-noise, high-gain transimpedance preamplifier ___________________________________________________ ___________________________________ 13 12 3 4 10 9 8 7 5 mon gnd n.c. out- v cc gnd n.c. out+ filt in 0.052in 1.32mm 0.029in 0.736mm (0,0) 6 chip topographies (continued) topography for max3658b downloaded from: http:///
package information (the package drawing(s) in this data sheet may not reflect the most current specifications. for the latest package outline information, go to www.maxim-ic.com/packages .) 6, 8, &10l, dfn thin.eps h 1 2 21-0137 package outline, 6,8,10 & 14l,tdfn, exposed pad, 3x3x0.80 mm common dimensions symbol min. max. a 0.70 0.80 d 2.90 3.10 e 2.90 3.10 a1 0.00 0.05 l 0.20 0.40 pkg. code n d2 e2 e jedec spec b [(n/2)-1] x e package variations 0.25 min. k a2 0.20 ref. 2.300.10 1.500.10 6 t633-1 0.95 bsc mo229 / weea 1.90 ref 0.400.05 1.95 ref 0.300.05 0.65 bsc 2.300.10 8 t833-1 2.00 ref 0.250.05 0.50 bsc 2.300.10 10 t1033-1 2.40 ref 0.200.05 - - - - 0.40 bsc 1.700.10 2.300.10 14 t1433-1 1.500.10 1.500.10 mo229 / weec mo229 / weed-3 0.40 bsc - - - - 0.200.05 2.40 ref t1433-2 14 2.300.10 1.700.10 t633-2 6 1.500.10 2.300.10 0.95 bsc mo229 / weea 0.400.05 1.90 ref t833-2 8 1.500.10 2.300.10 0.65 bsc m o229 / weec 0.300.05 1.95 ref t833-3 8 1.500.10 2.300.10 0.65 bsc m o229 / weec 0.300.05 1.95 ref -drawing not to scale- h 2 2 21-0137 package outline, 6,8,10 & 14l,tdfn, exposed pad, 3x3x0.80 mm 2.300.10 mo229 / weed-3 2.00 ref 0.250.05 0.50 bsc 1.500.10 10 t1033-2 max3658 622mbps, low-noise, high-gain transimpedance preamplifier 14 _________________________________________________ _____________________________________ downloaded from: http:///
max3658 622mbps, low-noise, high-gain transimpedance preamplifier maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a maxim product. no circuit patent licenses are implied. maxim reserves the right to change the circuitry and specifications without notice at any time. maxim integrated products, 120 san gabriel drive, sunnyvale, ca 94086 408-737-7600 ____________________ 15 2007 maxim integrated products is a registered trademark of maxim integrated products, inc. revision history rev 0; 10/03: initial data sheet release. rev 1; 5/04: added line to ec table regarding optical overload at 155mhz (page 3). rev 2; 11/05: changed to layout in figure 3 (page 8). rev 3; 2/07: added lead-free package to ordering information table (page 1). downloaded from: http:///

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