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sy84113bu low power 2.5v 1.25gbps limiting post amplifier with ultra wide los range micrel inc. ? 2180 fort une drive ? san jose, ca 95131 ? usa ? tel +1 ( 408 ) 944 - 0800 ? fax + 1 (408) 474 - 1000 ? http://www.micrel.com august 11 , 2015 revision 2.0 hbwhelp@micrel.com or (408) 955 - 16 90 general description the sy84113bu low power limiting post amplifier is designed for use in fiber - optic optical modules for multirate applications up to 1.25gbps. the device connects to a typical transimpedance amplifier (tia) and can produce output signals to cml - level waveforms. intended for the gbe and fibre channel applications, the sy84113bu offers a wide loss - of - signal (los) range. it is able to detect input signals for as low as 5mv pp and as high as 1 0 0mvpp. the sy84113bu is intended to be used in ac - coupled input applications. th e sy 84113bu generates a los open - collector ttl output. a programmable los level set pin (los lvl ) sets the sensitivity of the input amplitude detection. los asserts high if the input amplitude falls below the threshold set by los lvl and de - asserts low otherwise. the enable input (/en) de - asserts the true output signal without removing the input signal. the los output can be fed back to the /en input to implement the squelch function that maintain s output stability under a n los condition. the sy84113bu operates on a single 2.5 v power supply and offers ultra - low power consumption. this device is perfectly suited to meet the stringent power requirements of the csfp/sfp/sff optical modules. all support documentation can be found o n micrel?s web site at: www.micrel.com . features ? ultra - wide loss - of - signal (los) r ange ( 5mv pp to 1 0 0mvpp) ? single 2.5v power supply ? ultra - low power consumption (55mw typical ) ? 125mbps to 1.25 gbps operation ? low - noise c ml data outputs ? ttl /en input ? programmable los level ( los lvl ) ? internal 50 ? termination ? available in a tiny 3 mm 3 mm qfn package ? extensive temperature range ( ? 40 c to +95 c) applications ? gigabit ethernet ? fibre channel ? g epon markets ? datacom/telecom ? compac t sfp /sff o ptical transceiver ? sfp/sff o ptical transceiver _________________________________________________________________________________________________________ typical application
micrel, inc. sy84113bu august 11 , 2015 2 revision 2.0 hbwhelp@micrel.com or (408) 955 - 1690 ordering information part number package type operating range packa ge marking lead finish sy84113bumg qfn -16 indu s trial 113b with pb - free bar - line indicator nipdau pb - free sy84113bumg tr ( 1 ) qfn -16 indu s trial 113b with pb - free bar - line indicator nipdau pb - free notes: 1. tape and reel. pin configuration 16- pin ( 3mm 3mm) qfn -16 pin description pin number pin name type pin function 15 /en ttl input /enable: this input enables the outputs when low. internally connected to a 25k ? pull - up resistor and will default to a logic hi gh state if left open. 1, 4 din, /din data input differential data inputs. each input is internally terminated to the vref pin by a 50 resistor. 6 vref reference voltage: place 0.1uf capacitor to vcc to help stabilize los lvl . 14 los lvl dc input los s -of - signal level set. a resistor from this pin to v cc sets the threshold for the data input amplitude at which los will be asserted. 2, 3, 10, 11, epad gnd ground device ground . exposed pad (epad) must be connected to pcb ground plane. 7 los open - collec tor ttl output loss -of - s ignal: asserts high when the data input amplitude falls below the threshold set by los lvl . 12, 9 /dout, dout cml output differential data outputs. unused output should be terminated 50 to vcc. 5, 8, 13, 16 vcc positive rail positive power supply. . by pass with a 0.1uf || 0.01uf low - esr capacitor as close to vcc pin as possible.
micrel, inc. sy84113bu august 11 , 2015 3 revision 2.0 hbwhelp@micrel.com or (408) 955 - 1690 absolute maximum ratings ( 2 ) supply voltage (v cc ) ....................................... 0v to + 4 . 0v input voltage (din, /din) ....................................... 0 to v cc output current (i out ) ............................................... 25ma en voltage ............................................................. 0 to v cc v ref current ......................................... ? 800 a to +500 a los lvl voltage ................................................. v ref to v cc lea d temperature (soldering, 20s ) .......................... 260c storage temperature (t s ) ....................... ? 65c to +150c operating ratings ( 3 ) supply voltage (v cc ) ...................... + 2.375 to +2.625 v ambient temperature (t a ) .................. ? 40c to +9 5c junction temperature (t j ) ................ ? 40c to + 120 c package thermal resistance (4) ( ja ) still - air ................................................ 60c/w ( jb ) ............................................................ 33c/w dc electrical characteristics v cc = 2.5 5% ; t a = ? 40c to +9 5c, typical values at v cc = 2.5 v, t a = 25c. symbol parameter condition min . typ . max . units i cc power supply current outputs terminated 50 ? to vcc 22 35 ma los lvl los lvl voltage v ref v cc v v oh dout, /dout high voltage v cc ? 0.020 v cc ? 0.005 v cc v v ol dout, /dout low voltage v cc ? 0.4 75 v cc ? 0. 40 0 v cc ? 0.3 5 0 v v ref reference voltage vcc ? 0.6 v z 0 single - ended output impedance 40 50 60 ? z i single - ended input impedance 40 50 60 ? ttl dc electrical characteristics v cc = 2.5 5%; t a = ? 40c to +9 5c, typical values at v cc = 2.5v, t a = 25c. symbol parameter condition min . typ . max . units v ih /en input high voltage 2.0 vcc v v il /en input low voltage 0.8 v i ih /en input high current v in = v cc 2 0 a i il /en input low current v in = 0.5v ? 0.3 ma v oh los output high level vcc = 2.5v. ioh < 50ua 2 v v ol los output low level iol = 2ma 0.5 v notes : 2. permanent device dam age may occur if absolute maximum ratings are exceeded. this is a stress rating only and functional operation is not implied at conditions other than those detailed in the operational sections of this data sheet. exposure to absolute maximum ratings condit ions for extended periods may affect device reliability. 3. the data sheet limits are not guaranteed if the device is operated beyond the operating ratings. 4. package thermal resistance assumes exposed pad is soldered (or equivalent) to the devices most negativ e potential on the pcb. jb uses a 4 - layer and ja in still air unless otherwise stated.
micrel, inc. sy84113bu august 11 , 2015 4 revision 2.0 hbwhelp@micrel.com or (408) 955 - 1690 ac electrical characteristics v cc = 2.5 5%; t a = ? 40c to +9 5c, typical values at v cc = 2.5v, t a = 25c. ; r load = 50? to v cc ; symbol parameter condition min . typ . max . units t r , t f out put rise/fall time (20% to 80%) note 5 150 2 6 0 ps t jitter deterministic random note 6 note 7 15 5 ps pp ps rms v id differential input voltage swing 5 1800 mv pp v od differential output voltage swing note 5 7 00 8 00 950 mv pp t off los release time note 10 2 10 s t on los assert time note 10 2 10 s los al low los assert level r los lvl = 10 k ? ( 8 ) 3.9 mv pp los dl low los de - assert level r los lvl = 10 k ? ( 8 ) 5.6 mv pp h ys l low los hysteresis r los lvl = 10 k ? ( 8 ) 2 3. 1 4.5 db los am medium los assert level r los lvl = 5k ? ( 8 ) 7 9.2 mv pp los dm medium los de - assert level r los lvl = 5k ? ( 8 ) 13.6 16 mv pp h ys m medium los hysteresis r l os lvl = 5k ? ( 9 ) 2 3. 4 4.5 db los ah high los assert level r los lvl = 100 ? ( 8 ) 60 73 mv pp los dh high los de - assert level r los lvl = 100 ? ( 8 ) 103 130 mv pp h ys h high los hysteresis r los lvl = 100 ? ( 9 ) 2 3 .0 4.5 db b - 3db 3db bandwidth 850 mhz a v(diff) differential voltage gain 38 db s 21 single - ended small - signal gain 26 32 db notes : 5. amplifier in limiting mode. input is a 200mhz square wave. 6. determi nistic jitter measured using 1.25 0 gbps k28.5 pattern, v id = 6 0mv pp . 7. random jitter measured using 1 .25 0 gbps k28.7 pattern, v id = 6 0mv pp . 8. see ?typical operating characteristics? for a graph showing how to choose a particular r los lvl for a particular los assert and its associated de- assert amplitude. 9. this specification defines electrical hysteresis as 20log ( los de - assert/ los assert). the ratio between optical hysteresis and electrical hysteresis is found to vary between 1.5 and 2 depending upon the level of received optical power and rosa characteristics. ba sed on that ratio, the optical hysteresis corresponding to the electrical hysteresis range 2 db - 4.5 db, shown in the ac ch aracterist ics table, will be 1 db - 3db optical hysteresis. 10. in real world applications, the los release/assert time can be strongly influenced by the rc time constant of the ac - coupling cap and the 50 input termination. to keep this time low, use a decoupling cap 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 0.001 f to 1.0 f).
micrel, inc. sy84113bu august 11 , 2015 5 revision 2.0 hbwhelp@micrel.com or (408) 955 - 1690 typical functio nal characteristics v cc = 2.5 5%; t a = ? 40c to +9 5c, typical values at v cc = 2.5v, t a = 25c.; r load = 50? to v cc . typical operating characteristics v cc = 2.5 5%; t a = ? 40c to +9 5c, typical values at v cc = 2.5v, t a = 25c.; r load = 50? to v cc . los assert/de-assert levels 1 10 100 1000 0.1 1 10 loslvl resistor (kohm) amplitude (mv) los hysteresis 1 2 3 4 5 6 0.1 1 10 loslvl resistor (kohm) hysteresis (db)
micrel, inc. sy84113bu august 11 , 2015 6 revision 2.0 hbwhelp@micrel.com or (408) 955 - 1690 functional block diagram
micrel, inc. sy84113bu august 11 , 2015 7 revision 2.0 hbwhelp@micrel.com or (408) 955 - 1690 functional description the sy84113bu is a high - sensitivity limiting post amplifier that operates from a single + 2.5v power supply over temperatures from ? 40c to +85c. signals with data rates up to 1 .2 5 gbps, an d as small as 5mv pp , can be amplified. figure 1 shows the allowe d input voltage swing. the sy84113bu generates a los output signal that can be f ed back to /en for output stability in the absence of a signal at the input. los lvl sets the sensitivity o f the input amplitude detection. sy84113bu offers ultra wide los detection range. this allows the device to be used in multiple ac - coupled applications. input amplifier/buffer figure 2 shows a simplified schematic of the input stage. the high - sensitivity of the input amplifier can detect and amplify ac - coupled signals as small as 5mv pp to full cml output level . the input stage also can allow signals as large as 1800mv pp . input signals are amplified with a typically 38db differential voltage gain until they reach the limiting mode of the amplifier. sy84113bu outputs in standard 400mv cml output levels. output buffer the sy84113bu ?s cml output buffer is designed to drive 50? lines and is internally terminated with 50? to vcc. figure 3 shows a schematic of the outpu t stage. los s - of - signal (los) the sy84113bu generates a chatter - free los s - of - signal ( los ) open - collector ttl output as shown in figure 4. los is used to determine that 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 los lvl and de - asserts low otherwise. los can be fed back to the enable (/en) input to maintain output stability under a los s of signal condition. /en de - asserts low the true output signal without removin g the input signals. typically, 3 db los hysteresis is provided to prevent chattering. los level set a programmable los level set pin ( los lvl ) sets the threshold of the input amplitude detection. connecting an external resistor between v cc and los lvl sets t he voltage at los lvl . this voltage ranges from v cc to vref . the external resistor creates a voltage divider between v cc and vref , as shown in figure 5. hysteresis the sy84113bu provides typically 3 db los electrical hysteresis, which is defined as 20log ( vin los -assert / vin los -de -assert ). because the relationship between the voltage out of the rosa to optical power at its input is linear, the optical hysteresis will be typically half of the electrical hysteresis reported in the datasheet, but in practice the ratio between electrical and optical hysteresis is found to be within the range 1.5 - 1.8. thus 3 db electrical hysteresis will correspond to an optical hysteresis within the range 1. 7db - 2 db.
micrel, inc. sy84113bu august 11 , 2015 8 revision 2.0 hbwhelp@micrel.com or (408) 955 - 1690 figure 1. vis and vid d efinition figure 2. input structure figure 3. output structure figure 4. los output structure figure 5. los lvl setting circuit note : recommended value for r loslvl is 15k? or less.
micrel, inc. sy84113bu august 11 , 2015 9 revision 2.0 hbwhelp@micrel.com or (408) 955 - 1690 package information and recommended land pattern ( 11) 16- pin (3mm 3mm) qfn ( qfn -16) note: 11. package information is correct as of the publication date. for updates and most current in formation, go to www.micrel.com .
micrel, inc. sy84113bu august 11 , 2015 10 revision 2.0 hbwhelp@micrel.com or (408) 955 - 1690 package information and recommended land pattern ( 11) (continued)
micrel, inc. sy84113bu august 11 , 2015 11 revision 2.0 hbwhelp@micrel.com or (408) 955 - 1690 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, inc. is a leadin g global manufacturer of ic solutions for the worldwide high performance linear and power, lan, and timing & communications markets. the company?s products include advanced mixed - signal, analog & power semiconductors; high - performance communication, clock management, mems - based clock oscillators & crystal - less clock generators, ethernet switches, and physical layer transceiver ics. company customers include leading manufacturers of enterprise, consumer, industrial, mobile, telecommunications, autom otive, a nd computer products. corporation headquarters and state - of - the - art wafer fabrication facilities are located in san jose, ca, with regional sales and support offices and advanced technology design centers situated throughout the americas, europe, and asia. additionally, the company maintains an extensive network of distributors and reps worldwide. micrel makes no representations or warranties with respect to the accuracy or completeness of the inf ormation furnished in this data sheet. this information is n ot intended as a warranty and micrel does not assu me responsibility for its use. micrel reserves the right to change circuitry, specifications and descriptions at any time without notice. no license, whether express, implied, arising by estoppel or otherw ise, to any intellectual property rights is granted by this document. e xcept as provided in micrel?s terms and conditions of sale for such products, micrel assumes no liability whatsoever, and micrel disclaims any express or implied warranty relating to th e sale and/or use of micrel products including liability or warranties relating to fitness for a particular purpose, merchantability, or infringement of any patent, copyrig ht , or other intellectual property right. micrel products are not designed or autho rized for use as components in life support appliances, devices or systems where malfunction of a product can reasonably be expected to result in personal injury. life support devices or systems are devices or systems that (a) are intended for surgical imp lant into the body or (b) support or sustain life, and whose failure to perform can be reasonably expected to result in a sig nificant injury to the user. a purchaser?s use or sale of micrel products for use in life support appliances, devices or systems is a purchaser?s own risk and purchaser agrees to fully indemnify micrel for any damages resulting from such use or sale. ? 20 10 micrel, incorporated.

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