sy88313bl 3.3v, 3.2gbps cml low - power limiting post amplifier with ttl loss - of - signal micrel inc. ? 2180 fortune drive ? san jose, ca 95131 ? usa ? tel +1 (408) 944 - 0800 ? fax + 1 (408 ) 474 - 1000 ? http://www.micrel.com february 2007 m9999 - 021207-b hbwhelp@micrel.com or (408) 955 - 1690 general description the sy88313bl low - power limiting post amplifier is designed for use in fiber - optic receivers. the device connects to typical transimpedance amplifiers (tias). the linear signal output from tias can contain significant amounts of noise and may vary in amplitude over time. the sy88313bl quantizes these signals and outputs cml - level waveforms. the sy88313bl operates from a single +3.3v 10% supply, over temperatures ranging from ? 40c to +85c. with its wide bandwidth and high gain, signa ls with data rates up to 3.2gbps, and as small as 10mv pp , can be amplified to drive devices with cml inputs or ac - coupled cml/pecl inputs. the sy88313bl generates a loss - of - signal (los) open - collector ttl output. a programmable loss - of - signal level set pin (loslvl) sets the sensitivity of the input amplitude detection. los asserts high if the input amplitude falls below the threshold set by loslvl and de- asserts low otherwise. the enable bar 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 maintain output stability under a loss - of - signal condition. typically, 3.4db los hysteresis is provided to prevent chattering. datasheet and support documentation cab be found on micrel?s we b site at: www.micrel.com . features ? single 3.3v power supply ? dc to 3.2gbps operation ? low - noise cml data outputs ? chatter - free open - collector ttl loss - of - signal (los) output with internal 4.75k ? pull - up resistor ? ttl /en input ? internal 50 ? input termination ? programmable los level set (loslvl) ? ideal for multi - rate applications ? available in a tiny 10 - pin epad msop and 16- pin qfn package applications ? apon/bpon, gepon, epon, and gpon ? gigabit etherne t ? fibre channel ? oc - 3/12/24/48 sonet/sdh ? high - gain line driver and line receiver ? low - gain tia interface markets ? fttp/ftth ? datacom/telecom ? optical transceivers _________________________________________________________________________________________________ ______ typical application
micrel, inc. sy88313bl february 2007 2 m9999 - 021207-b hbwhelp@micrel.com or (408) 955 - 1690 ordering information (1) part number package type operating range package marking lead finish sy88313blmg qfn -16 industrial 313b with pb - free bar - line indicator nipdau pb - free sy88313blmgtr (2) qfn -16 industrial 313b with pb - free bar - line indicator nipdau pb - free sy88313bley k10 -2 industrial 313b with pb - free bar - line indicator matte -sn pb - free sy88313bleytr (2) k10 -2 industrial 313b with pb - free bar - line indicator matte -sn pb - free notes: 1. contact factory for die availabi lity. dice are guaranteed at t a = 25c, dc electricals only. 2. tape and reel. pin configuration 16- pin qfn 10 - pin epad - msop (k10 - 2)
micrel, inc. sy88313bl february 2007 3 m9999 - 021207-b hbwhelp@micrel.com or (408) 955 - 1690 pin description pin number (msop) pin number ( qfn ) pin name type pin function 1 15 /en ttl input: default is high. enable bar: de - assert true data output when high. 2 1 din data input true data input with 50 ? termination to v ref . 3 4 /din data input complementary data input with 50 ? termination to v ref . 4 6 vref reference voltage: placing a capacitor here to v cc helps stabilize los lvl . 5 14 loslvl input: default is maximum sensitivity loss -of - signal level set: a resistor from this pin to v cc sets the threshold for the data input amplitude at which the los output will be asserted. 6 exposed pad 2, 3, 10, 11 expo sed pad gnd ground device ground. exposed pad must be connected to pcb ground plane. 7 7 los open collector ttl output with internal 4.75k ? pull - up resistor loss -of - signal: asserts high when the data input amplitude falls below the threshold set by los lvl . 8 9 /dout cml output complementary data output. 9 12 dout cml output true data output. 10 5, 8, 13, 16 vcc power supply positive powe r supply.
micrel, inc. sy88313bl february 2007 4 m9999 - 021207-b hbwhelp@micrel.com or (408) 955 - 1690 absolute maximum ratings (1) 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 vref current ............................................................ 1ma loslvl voltage ............................................... v ref to v cc lead temperature (soldering, 20sec.) ................... +260c storage temperature (t s ) ........................ - 65c to +150c operating ratings (2) supply voltage (v cc ) ........................... +3.0v to +3.6v ambient temperature (t a ) .................. ? 40c to +85c junction temperature (t j ) ................ ? 40c to +120c junction thermal resistance (3) qfn ( ja ) still - air .................................................. 61c/w ( jb ) .............................................................. 38c/w epad - msop ( ja ) still - air .................................................. 38c/w ( jb ) .............................................................. 22c/w dc electrical characteristics v cc = 3.0v to 3.6v; r l = 50 to v cc ; t a = ? 40c to +85c, unless otherwise stated. symbol parameter condition min typ max units i cc power supply current no output load. 47 65 ma los lvl loslvl voltage v ref v cc v v oh cml output high voltage v cc - 0.020 v cc - 0.005 v cc v v ol cml output low voltage v cc = 3.3v v cc - 0.475 v cc - 0.400 v cc - 0.350 v v offset differential output offset 80 mv z o s ingle- ended output impedance 40 50 60 z i single - ended input impedance 40 50 60 v ref reference voltage v cc - 1.28 v ttl dc electrical characteristics v cc = 3.0v to 3.6v; r l = 50 to v cc ; t a = ? 40c to +85c, unless otherwise stated. symbol parameter condition min typ max units v ih /e n input high voltage 2.0 v v il /en input low voltage 0.8 v i ih /en input high current v in = 2.7v v in = v cc 20 100 a a i il /en input low current v in = 0.5v - 0.3 ma v oh los output high level v cc 3.3v, i oh (max) <160a v cc < 3.3v, i oh (max) <160a 2.4 2.0 v v v ol los output low level i ol = +2ma 0.5 v notes: 1. permanent device damage may occur if absolute maximum ratings are exceeded. this is a stress rating only and functional opera tion is not implied at conditions other than those det ailed in the operational sections of this data sheet. exposure to absolute maximum rating conditions for extended periods may affect device reliability. 2. the data sheet limits are not guaranteed if the device is operated beyond the operating ratings. 3. package thermal resistance assumes exposed pad is soldered (or equivalent) to the device?s most negative potential (gnd) on t he pcb. jb uses 4 - layer ( ja ) in still - air number, unless otherwise stated.
micrel, inc. sy88313bl february 2007 5 m9999 - 021207-b hbwhelp@micrel.com or (408) 955 - 1690 ac electrical characteristics v cc = 3.0v to 3.6v; r load = 50 ? to v cc ; t a = ? 40c to +85c. symbol parameter condition min typ max units t r , t f output rise/fall time (20% to 80%) note 4 60 120 ps t jitter deterministic random note 5 note 6 15 5 ps pp ps rms v id differential input voltage swing figure 1 1 0 1800 mv pp v od differential output voltage swing v id > 18mv pp figure 1 700 800 950 mv pp t off los release time 2 10 s t on los assert time 2 10 s los al low los assert level r loslvl = 15k ?, note 8 7.8 mv pp los dl low los de - assert level r loslvl = 15k ?, note 8 12 mv pp hys l low los hysteresis r loslvl = 15k ?, note 7 3.7 db los am medium los assert level r loslvl = 5k ?, note 8 10 17 mv pp los dm medium los de - assert level r loslvl = 5k ?, note 8 25 40 mv pp hys m medium los hysteresis r loslvl = 5k ?, note 7 2 3.3 4.5 db los ah high los assert level r loslvl = 100 ?, note 8 30 45 mv pp los dh high los de - assert level r loslvl = 100 ?, note 8 69 95 mv pp hys h high los hysteresis r loslvl = 100 ?, note 7 2 3.7 4.5 db b - 3db 3db bandwidth 2 ghz a v(diff) differential voltage gain 32 38 db s 21 single - ended small - signal gain 26 32 db notes: 4. amplifier in limiting mode. input is a 200mhz square wave. 5. deterministic jitter measured using 3.2gbps k28.5 pattern, v id = 10mv pp . 6. random jitter measured using 3.2gbps k28.7 pattern, v id = 10mv pp . 7. 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. based on that ratio, the optical hysteresis corresponding to the electrical hysteresis range 2db - 4.5db, shown in the ac characteristics table, will be 1db - 3db optical hysteresis. 8. see ?typical operatin g characteristics? for a graph showing how to choose a particular r loslvl for a particular los assert and its associated de - assert amplitude.
micrel, inc. sy88313bl february 2007 6 m9999 - 021207-b hbwhelp@micrel.com or (408) 955 - 1690 typical characteristics
micrel, inc. sy88313bl february 2007 7 m9999 - 021207-b hbwhelp@micrel.com or (408) 955 - 1690 functional diagram detailed description the sy88313bl low - power limiting post amplifier operates from a single +3.3v power supply, over temperatures from ? 40 o c to +85 o c. signals with data rates up to 3.2gbps and as small as 10mv pp can be amplified. figure 1 shows the allowed input voltage swing. the sy88313bl generates a los output . los lvl sets the sensitivity of the input amplitude detection. input amplifier/buffer figure 2 shows a simplified schematic of the sy88313bl?s input stage. the high - sensitivity of the input amplifier allows signals as small as 10mv pp to be detected and am plified. the input amplifier also allows input signals as large as 1800mv pp . input signals are linearly amplified with a typical 38db differential voltage gain. since it is a limiting amplifier, the sy88313bl outputs typically 800mv pp voltage - limited wavef orms for input signals that are greater than 12mv pp . applications requiring the sy88313bl to operate with high - gain should have the upstream tia placed as close as possible to the sy88313bl?s input pins to ensure the best performance of the device. output buffer the sy88313bl?s cml output buffer is designed to drive 50 ? lines. the output buffer requires appropriate termination for proper operation. an external 50 ? resistor to v cc for each output pin provides this. figure 3 shows a simplified schematic of th e output stage. loss - of - signal the sy88313bl generates a chatter - free los open - collector ttl output with an internal 4.75k ? pull - up resistor as shown in figure 5. los is used to determine that the input amplitude is large enough to be considered 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 bar (en) input to maintain output stability under a loss of signal condition. /en de - asserts the true ou tput signal without removing the input signals. typical 3.4db los hysteresis is provided to prevent chattering. loss - of - signal level set a programmable los level set pin (los lvl ) sets the threshold of the input amplitude detection. connecting an external r esistor between v cc and los lvl sets the voltage at los lvl . this voltage ranges from v cc to v ref . the external resistor creates a voltage divider between v cc and v ref as shown in figure 6. hysteresis the sy88313bl provides typically 3.4db los electrical hys teresis. by definition, a power ratio measured in db is 10log (power ratio). power is calculated as v 2 in /r for an electrical signal. hence, the same ratio can be stated as 20log (voltage ratio). while in linear mode, the electrical voltage input changes li nearly with the optical power and therefore, the ratios change linearly. thus, the optical hysteresis in db is half the electrical hysteresis in db given in the data sheet. since the sy88313bl is an electrical device, this data sheet refers to hysteresis i n electrical terms. with 3.4db los hysteresis, a voltage factor of 1.5 is required to assert or de- assert los.
micrel, inc. sy88313bl february 2007 8 m9999 - 021207-b hbwhelp@micrel.com or (408) 955 - 1690 figure 1. v is and v id definition figure 2. input structure figure 3. output structure figure 4. power supply current measurement figure 5. los output structure figure 6. los lvl setting circuit
micrel, inc. sy88313bl february 2007 9 m9999 - 021207-b hbwhelp@micrel.com or (408) 955 - 1690 package information 10- pin epad msop (k10 -2)
micrel, inc. sy88313bl february 2007 10 m9999 - 021207-b hbwhelp@micrel.com or (408) 955 - 1690 16- pin qfn micrel, inc. 2180 fortune drive san jose, ca 95131 usa tel +1 (408) 944 - 0 800 fax +1 (408) 474 - 1000 web http://www.micrel.com the information furnished by micrel in this data sheet is believed to be accurate and reliable. however, no responsibility is assumed by micrel for its use. micrel reserves the right to change circuitr y and specifications at any time without notification to the customer. micrel products are not designed or authorized for use as components in life support appliances, devices or systems where mal function 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 implant into the body or (b) support or sustain life, and whose failure to perform can be reasonably expected to res ult in a significant 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. ? 2005 micrel, incorpo rated.
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