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typical application circuit 19-6613; rev 0; 2/13 general description the MAX3797 is a low-power transimpedance amplifier designed for optical transmission systems at data rates up to 10.3125gbps and for use with pin diodes. the MAX3797 incorporates an automatic gain control (agc) architecture providing nominal small-signal trans- impedance of 5.5k. the input-referred noise is typi - cally 1.25a rms , which reflects a theoretical sensitivity of C14.8dbm oma at a bit error rate (ber) of 10 -12 for a pin (t = 0.55, r e = 3) photo detector. the small die size of 1mm x 0.76mm enables an opti - cal subassembly using a to-46 or to-56 package. the MAX3797 supports low-cost rosas by offering stable operation with no capacitors required in the rosa. the MAX3797s sensitivity is stable over temperature and supply. benefits and features s stable sensitivity over supply and temperature s up to 10.3125gbps (nrz) operation s supports no-capacitor rosa s agc gain of 5.5k s single 3.3v power supply s 105mw power consumption s wide bandwidth current monitor enables rssi-based los implementation s die size 1mm x 0.76mm applications 10.3125gbps ethernet optical receivers (10gbase-sr) 8.25gbps fibre channel optical receivers (8xfc) ordering information appears at end of data sheet. for related parts and recommended products to use with this part, refer to www.maximintegrated.com/MAX3797.related . in 50i 50i 0.1f 0.1f 0.1f 0.1f v cc outp outn gnd mon v cc max3798 max3799 rin+ rin- rout- rout+ r 50i 50i filt c vcc (optional) MAX3797 MAX3797 10.3gbps, low-power transimpedance amplifier for 10gbase-sr applications for pricing, delivery, and ordering information, please contact maxim direct at 1-888-629-4642, or visit maxim integrateds website at www.maximintegrated.com. http://www..net/ datasheet pdf - http://www..net/
2 power-supply voltage (v cc ) ................................ -0.3v to +4.0v continuous current into in .................................. -5ma to +5ma continuous current out of filt .......................... -8ma to +8ma continuous current in mon ............................... -5ma to +5ma continuous cml output current into outp, outn ......................................... -25ma to +25ma voltage at filt, outp, outn, mon ....... -0.3v to (v cc + 0.3v) operating junction temperature range (t j ) .... -55c to +150c storage temperature range (t stg ) ................ -55c to +150c die attach temperature .................................................. +400c absolute maximum ratings stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device. these are stress ratings only, and functional opera - tion 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. operating conditions electrical characteristics (v cc = 2.97v to 3.63v. t a = -40c to +85c, unless otherwise noted. typical values are at v cc = 3.3v, 100 differential output load between outp and outn, and t a = +25c.) parameter conditions min typ max units supply voltage 2.97 3.3 3.63 v backside die temperature -40 +25 +100 c data rate 10.3125 gbps wire bond inductance at pad in 0.3 0.5 nh photo diode junction capacitance 0.2 pf compliance voltage at mon 1.8 v parameter symbol conditions min typ max units power supply power-supply current i cc (note 1) 32 45 ma power-supply noise rejection psnr f p 10mhz, 20log( d v out / d v cc ) -19 db input specification input bias voltage v in (note 1) 1.0 1.1 v resistor at filt pad r filt (note 1) 160 200 240 i input-referred noise i n unfiltered output (notes 1, 2) 1.25 1.85 f a rms transfer specification differential transimpedance i in p 20 f a p-p (note 1) 4.3 5.5 6.7 k i optical small-signal bandwidth f 3db using cosemi 10g pin diode lpd3010 7.7 ghz low-frequency cutoff f c3db i in p 40 f a p-p 12.5 khz MAX3797 10.3gbps, low-power transimpedance amplifier for 10gbase-sr applications maxim integrated http://www..net/ datasheet pdf - http://www..net/
3 electrical characteristics (continued) (v cc = 2.97v to 3.63v. t a = -40c to +85c, unless otherwise noted. typical values are at v cc = 3.3v, 100 differential output load between outp and outn, and t a = +25c.) note 1: guaranteed by design and characterization. note 2: measured using an rf-power meter with no optical signal applied to the rosa. note 3: the deterministic jitter caused by the optical source is not included in the dj specification. note 4: gain stability is defined [(gain_measured) - (gain_reference)]/(gain_reference) over the listed current range, temperature, and supply variation. reference gain is an average of gain values over specified temperature and supply variation. parameter symbol conditions min typ max units output specification deterministic jitter dj 10.3125gbps with prbs31-1, i in p 1.0ma p-p (note 3) 6.0 ps p-p maximum differential output voltage v out(max)p-p i in > 100 f a p-p 300 mv p-p photocurrent monitor (rssi) maximum photocurrent output offset i monoffset no input current (note 1) 7.5 13.5 f a photocurrent monitor gain i mon /i avg 10 f a p i avg p 1.4ma 0v p v rssi p 1.8v (note 1) 0.486 0.5 0.513 a/a photocurrent monitor gain stability | d i mon /i avg | 10 f a p i avg p 1.4ma 0v p v rssi p 1.8v (notes 1, 4) 0.42 0.73 % MAX3797 10.3gbps, low-power transimpedance amplifier for 10gbase-sr applications maxim integrated http://www..net/ datasheet pdf - http://www..net/
4 typical operating characteristics (v cc = 3.3v, t a = +25c, 850nm rosa with spd3010 with responsivity of 0.5a/w, unless otherwise noted.) optical eye diagram (-4dbm oma and er = 5db) MAX3797 toc01 50mv/div 20ps/div 10.3125gbps prbs31-1 p oma (dbm) ber -11 -12 -14 -13 -16 -15 -17 -18 -10 unstressed optical ber curves vs. data rate (850nm; er = 5db) MAX3797 toc03 8.5gbps prbs31-1 10.3125gbps prbs31-1 10 -12 10 -11 10 -10 10 -9 10 -8 10 -7 10 -6 10 -5 10 -4 10 -3 10 -13 input-referred noise current vs. temperature MAX3797 toc06 temperature (c) input noise current (a rms ) 75 50 25 0 -25 0.5 1.0 1.5 2.0 2.5 3.0 0 -50 100 3.30v 2.95v 3.63v optical eye diagram (-13dbm oma and er = 5db) MAX3797 toc02 20mv/div 20ps/div 10.3125gbps prbs31-1 p oma (dbm) ber -11 -12 -14 -13 -16 -15 -17 -10 850nm stressed optical ber curve (er = 3db; vecp = 3.4db; jitter = 0.32ui p-p ) MAX3797 toc04 10.3125gbps prbs31-1 10 -12 10 -11 10 -10 10 -9 10 -8 10 -7 10 -6 10 -5 10 -4 10 -3 10 -13 differential output amplitude vs. input optical power (er = 11db) MAX3797 toc05 p avg (dbm) output amplitude (mv p-p ) -5 -10 -15 100 150 200 250 300 350 400 50 -20 0 t a = +25c t a = +85c t a = -40c MAX3797 10.3gbps, low-power transimpedance amplifier for 10gbase-sr applications maxim integrated http://www..net/ datasheet pdf - http://www..net/
5 typical operating characteristics (continued) (v cc = 3.3v, t a = +25c, 850nm rosa with spd3010 with responsivity of 0.5a/w, unless otherwise noted.) output return gain (sdd22) (includes rosa with flex pcb) MAX3797 toc07 frequency (ghz) sdd22 (db) 10 -35 -30 -25 -20 -15 -10 -5 0 -40 1 100 output common-mode to differential-mode conversion (scd22) (includes rosa with flex pcb) MAX3797 toc09 frequency (ghz) scd22 (db) 10 -35 -30 -25 -20 -15 -10 -5 0 -40 1 100 output common-mode return gain (scc22) (includes rosa with flex pcb) MAX3797 toc08 frequency (ghz) scc22 (db) 10 -35 -30 -25 -20 -15 -10 -5 0 -40 1 100 p avg (mw) rssi amplitude (mv) 0.8 0.6 0.4 0.2 100 200 300 400 500 600 0 0 1.0 rssi voltage vs. input optical power (er = 11db) MAX3797 toc10 from t a = -40c to +85c MAX3797 10.3gbps, low-power transimpedance amplifier for 10gbase-sr applications maxim integrated http://www..net/ datasheet pdf - http://www..net/
6 pad description pad name function equivalent circuit 1, 3 filt provides filtered pin bias voltage. 2 in tia input. signal current from the photo diode flows into this pad. 4 mon monitor output. analog current output proportional to the average photo diode current. connect resistor between mon and gnd to develop a gnd referenced monitor voltage. important : for proper operation of the tia signal path, it is imperative to choose the value of the external resistor according to the maximum mon compliance voltage of 1.8v. if the rssi function is not required then mon must be tied to gnd. 5, 7, 11, 13 gnd ground. tia ground connection. r in 200i filt v cc 220pf mon v cc MAX3797 10.3gbps, low-power transimpedance amplifier for 10gbase-sr applications maxim integrated http://www..net/ datasheet pdf - http://www..net/
7 pad description (continued) pad name function equivalent circuit 6 outn negative cml output. current flowing into in causes outn to decrease. 8 test test mode input. connect through bond wire to gnd for proper operation. 9, 10 n.c. no connection. leave open for proper operation 50i v cc outp outn 50i v cc n.c. v cc test MAX3797 10.3gbps, low-power transimpedance amplifier for 10gbase-sr applications maxim integrated http://www..net/ datasheet pdf - http://www..net/
8 pad description (continued) pad name function equivalent circuit 12 outp positive cml output. current flowing into in causes outp to increase. 14 v cc supply voltage 50i v cc outp outn 50i MAX3797 10.3gbps, low-power transimpedance amplifier for 10gbase-sr applications maxim integrated http://www..net/ datasheet pdf - http://www..net/
9 chip topography detailed description the MAX3797 is a low-power transimpedance amplifier designed for optical transmission systems at data rates up to 10.3gbps. the functional diagram of the MAX3797 is shown in figure 1 . the MAX3797 comprises of a transimpedance amplifier stage with automatic gain control (agc), a dc offset correction loop, photo diode filtering with current monitor and an output buffer. the MAX3797 is designed to work with pin photo diodes and does not require a bypass capacitor. transimpedance amplifier stage with automatic gain control (agc) the signal current from the photodiode flows into the input node of a linear gain amplifier stage in the MAX3797 design. a low input impedance circuit converts the single-ended input current to a differential output volt - age. at input currents above 100a p-p the gain of this linear amplifier is controlled by an agc that adjusts the gain through a feedback loop. table 1. pad coordinates pad number pad name x [um] y[um] 1 filt 0 0 2 in 0 -125.0 3 filt 0 -250.0 4 mon 125.2 -390.5 5 gnd 300.2 -390.5 6 outn 425.2 -390.5 7 gnd 550.2 -390.5 8 test 778.0 -250.0 9 n.c. 778.0 -125.0 10 n.c. 778.0 0 11 gnd 550.2 147.5 12 outp 425.2 147.5 13 gnd 300.2 147.5 14 vcc 125.2 147.5 gnd v cc outp gnd gnd mon outn gnd 13 14 12 11 5 4 6 7 MAX3797 n.c. n.c. test filt in filt (0,0) 2 3 10 9 8 1 + MAX3797 10.3gbps, low-power transimpedance amplifier for 10gbase-sr applications maxim integrated http://www..net/ datasheet pdf - http://www..net/
10 dc offset correction loop the dc offset correction loop uses a low-frequency feed - back circuit to remove the dc component of the input signal. this feature centers the input signal within the tias linear range, thereby reducing pulse-width distor - tion caused by large input signals. the dc cancellation circuit is internally compensated and therefore does not require external capacitors. photodiode filtering with current monitor photodiode bias filtering in the MAX3797 is accom - plished by an rc supply filter to v cc . the filter circuitry also contains a receive signal strength indicator (rssi) that monitors the average photodiode current by sens - ing the voltage across the filter resistor rfilt. the filter circuitry is shown in figure 2 . output buffer the output buffer consists of a differential stage with 50? single-ended termination to v cc . for optimum supply- noise rejection, the MAX3797 should be ac-coupled to a matched load. applications information layout considerations noise performance and bandwidth are adversely affect - ed by the capacitance at the in pad. minimize capaci - tance on this pad and select a low-capacitance pin. the outp and outn bond wire lengths should also be mini - mized to meet the bandwidth specification. special care should be taken when bonding the input pad in to avoid esd events. it is recommended to follow rosa assembly instructions as depicted in figure 3. figure 1. MAX3797 functional diagram figure 2. photodiode bias filtering with current monitor figure 3. typical layout for to-46 header pd filter filt tia offset correction agc outp mon v cc outn MAX3797 in r filt 200i rssi pd filter mon filt v cc 220pf vcc outp mon outn MAX3797 MAX3797 10.3gbps, low-power transimpedance amplifier for 10gbase-sr applications maxim integrated http://www..net/ datasheet pdf - http://www..net/
11 chip information process: sige bipolar ordering information * dice are tested and guaranteed only at +25c, backside tem - perature. part temp range pin-package MAX3797e/d+ -40 n c to +100 n c dice* MAX3797 10.3gbps, low-power transimpedance amplifier for 10gbase-sr applications maxim integrated http://www..net/ datasheet pdf - http://www..net/
maxim integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a maxim integrated product. no circuit patent licenses are implied. maxim integrated reserves the right to change the circuitry and specifications without notice at any time. the parametric values (min and max limits) shown in the electrical characteristics table are guaranteed. other parametric values quoted in this data sheet are provided for guidance. maxim integrated 160 rio robles, san jose, ca 95134 usa 1-408-601-1000 12 ? 2013 maxim integrated products, inc. maxim integrated and the maxim integrated logo are trademarks of maxim integrated products, inc. revision history revision number revision date description pages changed 0 2/13 initial release MAX3797 10.3gbps, low-power transimpedance amplifier for 10gbase-sr applications http://www..net/ datasheet pdf - http://www..net/

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