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SY88073L 1g to 12.5g limiting post amplifier with programmable decision threshold revision 1.0 . micrel inc. ? 2180 fortune drive ? san jose, ca 95131 ? usa ? tel +1 (408) 944 - 0800 ? fax + 1 (408) 474 - 1000 ? http://www.micrel.com november 8 , 20 13 revision 1.0 hbwhelp@micrel.com o r (408) 955 - 1690 general description the sy 88073l limiting post amplifier is designed for use in fiber - optic receivers for continuous mode, mul ti - ra te applications from 1gbps to 12.5 gbps. the sy 88073l contains a high - bandwidth, high - sensitivity input stage with user - programmable, w ide - range sd a ssert/ los d e-a ssert threshold levels, which enables optimized system reach. typically, 4db of electrical hysteresis is provided to minimize los or sd chattering caused by noisy input signals. a logic level control pin is provided to enable user selection of an open - collector , ttl - compatible los or sd status indication signal with an external 5k to 10k pull - up resistor. the sy 88073l provides fast er sd a ssert and los de- a ssert times (than typical continuous mode devices) over the entire differential input voltage range of 10 mv pp to 1800mv pp . the sy 88073l input stage also provides a user - adjustable decision threshold circuit to optimize ber in noisy applications suc h as wdm , where edfa and raman amplifiers contribute uneven noise levels. by applying an external control voltage, the decision threshold can typically be adjusted from 30% to 70% from the nominal 50% threshold when the circuit is disabled. the sy 88073l pr ovides integrated 50 input and output impedances to optimize the high - speed signal paths and reduce component count. the post amplifier outputs have user - selectable polarity inversion c ontrol to simplify pcb layout. a ttl - compatible jam input is provided to enable a squelch function by feeding back the los or sd signal. the jam input disables only the post amplifier output. the sy 88073l operates from a single +3.3v power supply, over temperatures ranging from C 40 c to +85 c . datasheets and support documentation are available on micrels web site at: www.micrel.com . features ? multi - rate operation from 1.0625g bps to 12.5 gbps ? adjustable decision threshold level for offset compensation or ber optimization ? wide differential input range (10 mv pp to 1800mv pp ) ? wide sd de-a ssert or los assert threshold range ? 4.5 mv pp to 30mv pp ? 4db typical electrical hysteresis ? fast sd assert and los d e-a ssert times ? 1s typical; 2s m aximum ? selectable los or sd status signal indicator ? selectable rxout+/ rxout ? polarity inversion ? ttl - compatible jam input with internal pull - up ? low - noise cml data inputs with integrated 50 termination impedance to internal reference v ref ? low - noise cml data outputs with integrated 50 termination impedance ? 30 ps typical rise/fall times ? wide range power supply: 3.3v 10% ? industrial temp erature range: ? 40 c to +85c ? available in a tiny 3 mm x 3mm qfn package applications ? 10g/ 8g fibre channel ? 10gigabit ethernet ? otn equipment ? sonet oc192; sdh stm64 ? wdm/dwdm s ystems markets ? fibre channel storage area networks ? datacom/enterprise ? h igh -p erformance c omputing ? telecom ? wireless base s tations downloaded from: http:///
micrel, inc. SY88073L november 8 , 20 13 2 revision 1.0 hbwhelp@micrel.com or (408) 955 - 1690 typical application circuit C fixed decision threshold typical application circuit C adjustable decision threshold note: v cpa from dac output or other voltage source. downloaded from: http:///
micrel, inc. SY88073L november 8 , 20 13 3 revision 1.0 hbwhelp@micrel.com or (408) 955 - 1690 ordering information part number package type operating range package marking lead finish sy 88073l mg 3 mm x 3mm qfn - 16 industrial 073l with pb - free bar line indicator nipdau pb- free sy 88073l m g tr ( 1 ) 3mm x 3mm qfn - 16 industrial 073l with pb - free bar line indicator nipdau pb - free note: 1. tape and reel . pin configuration 16 - pin 3mm x 3mm qfn (top view) downloaded from: http:///
micrel, inc. SY88073L november 8 , 20 13 4 revision 1.0 hbwhelp@micrel.com or (408) 955 - 1690 pin description pin number pin name pin type pin function 1 gnd negative supply rail negative supply r ail. connect to the pcb negative power supply plane that is also connected to the ep ad . 2 rxin+ high - speed data input differen tial n oninverting data i nput. lvp ecl/cml compatib le. ac- coupled with 100nf (high - frequency, low - esr cap acitor is recommended) . internally terminated with 50 to v cc C 1. 2v. ac- coupled only. 3 rxin ? high - speed data input dif ferential i nverting data i n put. lvpecl/ cml - compatible. ac -c oupled with 100nf (high - frequency, low - esr cap acitor is recommended) . i nternally terminated by 50 to v cc C 1. 2v. ac- coupled only. 4 gnd negative supply rail negative supply rail. connect to the pcb negative power supply plane that is also connected to the ep ad . 5 vthn analog voltage input analog control input. connect to vth_ref for crossing threshold ad justment using vthp (pin 16). connect to gnd to disable crossing point adjust ment capability. 6 vth_ref analog current output reference v olta ge. 1.25v reference with respect to gnd for crossing point decision threshold adjustment. 7 sd/los open collector logic output o utput status indicator. loss - of - signal (los) or signal d etect (sd) open collector output externally terminated with 5k to 10k resistor to v cc . ttl - compatible logic levels . los = high when rxin+/ rxin ? amplitude falls below the threshold set at the sd/loslvl pin. sd = low when rxin+ / rxin ? amplitude falls below the threshold set at the sd/loslvl pin. 8 sd/ loslvl analog input analog control input. sets the trigger threshold for the los or sd status indicator signals. if sd/los_ sel = high (los selected), connect a resistor from the sd/ loslvl pin (loss of s ignal threshold l evel) to v cc to adjust the los_assert threshold for the rxin+ /rxin ? data inputs. if sd/los _sel = low (sd selected), connect a resistor from the sd/ loslvl pin ( s ignal select l evel) to v cc to adjust the s d_d e- assert threshold for the rxin+ /rxin ? data in puts. 9 , 12 v cc positive supply rail posit ive power supply input. bypass with a 0.1 f cap acitor in parallel with a 0.01 f low - esr cap acitor to gnd as close as possible to the v cc pin. 10 rxout ? high - speed data output differential i nverting data o utput (d efault) . cml - compatible and internally terminated by 50 to v cc . can be ac - or dc - coupled to downstream devices. can be inverted using the rxout_inv control pin. 11 rxout+ high - speed data output differential noninverting d ata o utput (d efault) . cml - compatible and internally terminated by 50 to v cc . can be ac - or dc - coupled to downstream devices. can be inverted using the rxout_inv control pin. 13 rxout_inv logic level input input control signal. ttl - compatible logic input signal to invert the polar ity of the rxout+ / ? signals. internal ~18k pull - up to v cc . default = high (nc): pin 10 = rxout ? and p in11 = rxout+ rxout_inv = low: pin 10 = rxout+ and p in11 = rxout ? . 14 sd/los _sel logic level input input control signal . ttl - compatible logic input signal to select los or sd as the output signal. internal ~18k pull - up to v cc . default = high (nc): los selected C normal operation los/sd _sel = low: sd selected and jam operation is inverted downloaded from: http:///
micrel, inc. SY88073L november 8 , 20 13 5 revision 1.0 hbwhelp@micrel.com or (408) 955 - 1690 pin description (continued) pin number pin name pin type pin function 15 jam logic level input input control signal. ttl - compatible input signal that enables or disables the rxout+/ ? output signals. internal 2 7k pull - up resistor to v cc . can be connected to sd/los to form a squelch function. when sd/los _sel = high default = high and rxout+/ ? outputs are disabled. low = rxout+ and rxout ? o utputs are enabled . operation is inverted when sd/los _sel = low and sd is sel ected. 16 vthp analog voltage input analog control voltage input that typically adjusts the crossing point threshold from 30% to 70%. threshold crossing adjustment control. apply a dc - contro ll ed voltage from 0v to 2.4v to adjust the crossing point. vthn (pin 6) must be connected to vth_ref (pin 7). nominal 50% midpoint decision threshold occurs with vthp = 1.25v. connect to ground to disable decision threshold (crossing point) adjust capability. epad gnd negative supply rail exposed thermal pad. must be soldered to pcb plane connected to the negative supply rail. the recommended via array is needed to remove heat from the device. downloaded from: http:///
micrel, inc. SY88073L november 8 , 20 13 6 revision 1.0 hbwhelp@micrel.com or (408) 955 - 1690 absolute maximum ratings ( 2 ) supply voltage (v cc ) ......................................... 0v to +4.0v input voltage (rxin+, rxin ? ) ................. v cc C 1.5v to v cc cml output voltage (v out ).. .. v cc ? 1.0v to v cc + 0.5v v vth_ref current ..................................... ? 800 a to +500 a jam voltage ........................................................... 0 to v cc sd/loslvl voltage ................................ v cc C 1.3v to v cc le ad temperature (soldering, 20s ) ............................ 260c storage temperature (t s ) ......................... C 65c to +150c operating ratings ( 3 ) supply voltage (v cc ) .................................... +3.0v to +3.6v ambient temperature (t a ) .......................... C 40c to +85c junction temperature (t j ) ........................ C 40c to +125c package thermal resistance ( 4 ) qfn ( ja ) still -a ir ............................................... 60c/w qfn ( jb ) ........................................................... 33c/w dc electrical characteristics v cc = 3.0 to 3.6v; t a = C 40c to +85c, typical values at v cc = 3.3v, t a = 25c. symbol parameter condition min . typ . max . units i cc power supply current note 5 60 75 ma sd/loslvl sd or los threshold voltage v cc ? 1.3 v cc v v oh rxout+/rxout ? high voltage v cc ? 0.020 v cc ? 0.005 v cc v v ol rxout+/rxout ? low voltage v cc ? 0.400 v cc ? 0.350 v cc ? 0.300 v v offset differential output offset vthp and vthn tied to gnd 80 mv v vth_ref decision threshold reference voltage 1.25 v z 0 single - ended output impedance 45 50 55 z i single - ended input impedance 45 50 55 notes: 2. permanent device damage may occur if absolute maximum ratings are exceeded. this is a str ess rating only and functional operation is not implied at conditions other than those detailed in the operational sections of this datasheet. exposur e to absolute max imum ratings conditions may affect device reliability . 3. the datasheet limits are not guaranteed if the device is operated beyond the recommended operating conditions. 4. package t hermal r esistance assumes that the exposed pad is soldered (or equivalent) to the devices most negative potential on the pcb. jb and ja assumes still air and a 4 - layer pcb, unless otherwise stated. it also a ssumes that the recommended via pattern and via sizes on the pcb are used . 5. outputs rxout+ and rxout ? are loaded with external 50 loads and the outputs are enabled. downloaded from: http:///
micrel, inc. SY88073L november 8 , 20 13 7 revision 1.0 hbwhelp@micrel.com or (408) 955 - 1690 ttl dc electrical characteristics v cc = 3.0 to 3.6v; t a = C 40c to +85c, typical values at v cc = 3.3v, t a = 25c. symbol parameter condition min . typ . max . units cpa low output signal crossing range lower limit vthn connected to vth_ref and 0 v to 2.4v applied to vthp. 10 v id 60 mv pp , see crossing point adjustment waveforms . note 6. 30 40 % cpa high output signal crossing range upper limit 60 70 % v ih input high voltage jam, rxout_inv, sd/los_sel 2.0 v v il input low voltage jam, rxout_inv, sd/los_sel 0.8 v i ih jam, rxout_inv, sd/los_sel input high current v in = 2.7v 20 a v in = v cc 100 i il jam, rxout_inv, sd/los_sel input low current v in = 0.4v ? 0.3 ma v oh sd or los output high level sourcing 100a 2.4 v v ol sd or los output low level sinking 2ma 0.4 v note: 6. crossing point a djust functionality is limited to small input amplitude swing levels , as noted. crossing point adjust range is reduced outside of the noted input amplitude swing levels. downloaded from: http:///
micrel, inc. SY88073L november 8 , 20 13 8 revision 1.0 hbwhelp@micrel.com or (408) 955 - 1690 ac electrical characteristics v cc = 3.3v 10%, t a = C 40c to +85c. typical values at v cc = 3.3v, t a = 25c; r load = 50? to v cc . symbol parameter condition min . typ . max . units v oh rxout+, rxout ? high voltage v cc ? 0.020 v cc ? 0.005 v cc v v ol rxout+, rxout ? low voltage v cc ? 0.400 v cc ? 0.350 v cc ? 0.300 v t r , t f output rise/fall time (20% to 80%) note 7 30 45 ps t jitter deterministic note 8 10 ps random note 9 1 v id differential input voltage swing note 10 . see figure 1 . 10 1800 mv pp v od differential output voltage swing note 7 600 700 800 mv pp t los_d ; t los_a t sd_d; t sd_a los de -a ssert, los assert time \ sd de -a ssert, sd assert time note 11 1 2 u s los am_10k medium los assert level r loslvl = 10k ?, note 12 4.5 mv pp los dm_10k medium los de - assert level r loslvl = 10k ?, note 12 7.3 mv pp hys m_10k medium los hysteresis r loslvl = 10k ?, note 13 2 4.1 6 db los ah1_1k high1 los assert level r loslvl = 1k ?, note 12 18.6 mv pp los dh1_1k high1 los de - assert level r loslvl = 1k ?, note 12 28.3 mv pp hys h1_1k high1 los hysteresis r loslvl = 1k ?, note 13 2 3.6 6 db los ah2_100 high2 los assert level r loslvl = 100?, note 12 29.7 mv pp los dh2_100 high2 los de - assert level r loslvl = 100?, note 12 44.6 mv pp hys h2_100 high2 los hysteresis r loslvl = 100?, note 13 2 3.5 6 db a v(diff)_053 c differential voltage gain 44 db s 21_053 c single - ended small - signal gain 32 38 db note: 7. amplifier is in limiting mode. input is a 200mhz square wave. 8. deterministic jitter is measured using 10gbps k28.5 pattern, v id = 20mv pp . 9. random jitter is measured using 10gbps k28.7 pattern, v id = 20mv pp . 10. differential input swing amplitude for data rates up to 1 2.5 gbps 11. in re al world applications, the los de- assert/a ssert time can be strongly influenced by the rc time constant of the ac - coupling cap acitor and the 50 input termination. to keep this time low, use a decoupling cap acitor with the lowest value that is allowed by the data rate and the number of consecutive identical bits in the application (typical values are in the range of 0.001f to 0.1f ). 12. see typical operating characteristics for a graph showing how to choose a particular r loslvl for a particular los assert and its associated de - assert amplitude. 13. this specification defines electrical hysteresis as 20log (los de -a ssert/los a ssert). the ratio between optical hysteresis and electrical h ysteresis is found to vary between 1.5 and 2 , depending on the level of received optical power and rosa characteristics. downloaded from: http:///
micrel, inc. SY88073L november 8 , 20 13 9 revision 1.0 hbwhelp@micrel.com or (408) 955 - 1690 crossing point adjustment waveforms waveform 1: nominal crossing point adjustment ( 50% decision threshold) C 20mv pp signal i nput (vthn is tied to vth_ref; vthp = 1.25v) waveform 2: minimum crossing point adjustment ( ~30% decision threshold) C 20mv pp signal i nput vthn is tied to vth_ref; vthp is approximately 0.75v note : although the crossing point adjustment circuit has sufficient range to move the decision point threshold to 20%, it is recommended that the minimum adjustment be limited to ~30%. waveform 3: minimum crossing point adjustment ( ~70% decision threshold) C 20mv pp signal i nput v thn is tied to vth_ref; vthp is approximately 1.75v note : although the crossing point adjustment circuit has sufficient range to move the decision point threshold to 80%, it is recommended that the maximum adjustment be limited to ~70%. downloaded from: http:///
micrel, inc. SY88073L november 8 , 20 13 10 revision 1.0 hbwhelp@micrel.com or (408) 955 - 1690 typical operating characteristics v cc = 3.3v, t a = 25c, r load = 50? to v cc , unless otherwise stated. 20 ps/div, typical 10.3g output with 10mv pp input signal 20 ps/div, typical 12.5g output with 10mv pp input signal 1 10 100 10 100 1000 10000 100000 input signal amplitude (mv pp ) sd/loslvl resistor ( ?) v id (los assert) and v id (los de - assert) vs. r sd/loslvl 0.00 1.00 2.00 3.00 4.00 5.00 6.00 10 100 1000 10000 100000 hysteresis (db) sd/loslvl resistor ( ?) los hysteresis vs. loslvl resistor downloaded from: http:///
micrel, inc. SY88073L november 8 , 20 13 11 revision 1.0 hbwhelp@micrel.com or (408) 955 - 1690 functional block diagram downloaded from: http:///
micrel, inc. SY88073L november 8 , 20 13 12 revision 1.0 hbwhelp@micrel.com or (408) 955 - 1690 functional description the sy 88073l is a high - sensitivity, high - bandwidth limiting post amplifier . it operates from a single +3.3v power supply across the entire industrial temperature range of C 40c to +85c. sig nals with data rates from 1 g bps to 12.5g bps and amplitudes as small as 10 mv pp are supported. figure 1 shows the allowed input voltage swing. rxin+ rxin- v is (mv) 5 (mv) 900 (mv) (rxin+) C (rxin-) v id (mv pp ) 10 (mv pp ) 1800 (mv pp ) figure 1 . v is and v id definition the sy 88073l has a selectable sd or los status output signal that can be fed back to the jam input to perform the squelch function for output stability if there is no signal at the input. sd/loslvl sets the sensitivity of the input amplitude detection. in applications where the noise i s not evenly distributed between the high and the low levels of the signal, such as links using edfa amplifiers, the zero crossing poin t (decision threshold) of the signal can be adjusted, using the vthn and vthp pins to optimize the performance of the link. input amplifier/buffer figure 2 shows a simplified schematic of the input stage. the high sensitivity of the input amplifier allows signals as small as 10 mv pp to be detected and amplified. the input amplifier allows input signals as large as 1800mv pp . input signals are amplified with a typical 44db differential voltage gain. the user will need to select the appropriate ac coupling capacitor value for their application. output buffer the sy 88073l cml output buffer is designed to drive 50? impedance transmission lines and is internally terminated with 50? to v cc . figure 3 shows a simplified schematic of the output stage. the user will need to select the appropriate ac coupling capacitor value for their application. signal detect/loss of signal the sy 88073l generates a user - selectable (sd/los_sel pin) signal d etect (sd) or l oss of s ignal (los) open - collector ttl output , as shown in figure 4 . los is used to determine whether the input amplitude is too small to be considered as a valid input. los asserts high if the input amplitude falls below the threshold set by sd/loslvl and de - asserts low otherwise. los can be fed back to the jam input to perform the squelch function and to maintain output stability under a los condition. jam de - asserts the true output signal low without removing the input signals. typically, 4db los hysteresis is provided to prevent chattering. when sd/loslvl is used to select the sd output on the sd/los pin, sd is a sserted when the differential input signal amplitude exceeds the level set by the sd/loslvl resistor. the jam operation is inverted when sd is sele cted. signal detect/ loss of signal level setting a programmable sd/los level set pin (sd/loslvl) sets the threshold of the input amplitude detection. connecting an external resistor between v cc and sd/loslvl sets the threshold voltage. this voltage ranges from v cc to v cc ? 1.3v. the external resistor creates a voltage divider between v cc and v cc ? 1.3v, as shown in figure 5 . hysteresis the sy 88073l provides typically 4db los electrical hysteresis, which is defined as 20log (vin los_de-assert vin los_assert ). because the relationship of the voltage output of the rosa to optical power at its input is linear, the optical hysteresis is typically half of the electrical hysteresis reported in the datasheet . i n practice , the ratio between electrical and optical hysteresis is found to be between 1.5 and 1.8. thus , 4db el ectrical hysteresis correspond s to an optical hysteresis within the range of 2 db to 2.4db. signal crossing point adjustment to optimize the decision threshold level , and so the ber of the optical link where the noise is unevenly distributed between the high and the low levels, the sy 88073l provides two pins for output signal crossing point adjustment (decision threshold) control. the output signal crossing can be adjusted by connecting vthn (pin 5) to vth_ref (pin 6), and applying a dc signal at vthp (pin 16). by varying the dc signal at vthp from 0v to 2.5v while the input signal to the post amplifier is less than 6 0mv pp , the crossing point of the output signal change s from approximately 30% to 70% , reaching 50% when vthp = vth_ref = 1.25v. if the crossing point control function is not needed, vthn and vthp must be connected to gnd. downloaded from: http:///
micrel, inc. SY88073L november 8 , 20 13 13 revision 1.0 hbwhelp@micrel.com or (408) 955 - 1690 functional circuit structure figure 2 . typical input structure figure 3 . typical output structure downloaded from: http:///
micrel, inc. SY88073L november 8 , 20 13 14 revision 1.0 hbwhelp@micrel.com or (408) 955 - 1690 figure 4 . typical sd/los output structure figure 5. typical sd/loslvl setting circuit related product and support documentation document number title application note link an- 45 notes on sensitivity and hysteresis in micrel post amplifiers www.micrel.com/_pdf/hbw/app - notes/an - 45.pdf SY88073L_83l_eb SY88073L/sy88083 l evaluation board http://www.micrel.com/_pdf/eval - board/SY88073L_83l_eb.pdf downloaded from: http:///
micrel, inc. SY88073L november 8 , 20 13 15 revision 1.0 hbwhelp@micrel.com or (408) 955 - 1690 package information ( 14 ) 16 - pin (3mm x 3mm) qfn - 16 note: 14. package information is correct as of the publication date. for updates and most current information, go to www.micrel.com . 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 micrel makes no representations or warranties with respect to the accuracy or co mpleteness of the information furnished in th is data sheet . this information is not intended as a warranty and micrel does not assume responsibility for its us e. micrel reserves the right to change circuitry, specifications and descriptions at any time without notice. no license, whether express, implied, arising by estoppel or otherwise, to any intellectual property rights is granted by this document. except as provided in micrels terms and conditions of sale for such products, mic rel assumes no liability whatsoever, and micrel disclaims any express or implied warranty relating to the sale and/or u se of micrel products including liability or warranties relating to fitness for a particular purpose, merchantability, or infringement of any pat ent, copyright or other intellectual property right . micrel products are not designed or authorized for use as components in life support appliances , devices or systems where malfunction of a pro duct can reasonably be expected to result in personal injury. life support devices or systems are device s or systems that (a) are i ntended for surgical implant into the body or (b) support or sustain life, and whose failure to perform can be reasonably expect ed to result in a significant injury to the user. a purchasers use or sale of micrel products for use in life support appliances, devi ces or systems is a purchasers own risk and purchaser agrees to fully indemnify micrel for any damages resulting from such use or sale. ? 20 13 micrel, incorporated. downloaded from: http:///

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