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sy88353bl 3.3v, 3.2 gbps limiting post amplifier with programmable decision threshold mlf and micro leadframe are registered trademarks of amkor technology. micrel inc. 2180 fortune drive san jose, ca 95131 usa te l +1 (408) 944-0800 fax + 1 (408) 474-1000 http://www.micre l.com february 2007 1 m9999-021707-b hbwhelp@micrel.com or (408) 955-1690 general description the sy88353bl limiting post amplifier is designed for use in fiber-optic receivers, and is specially optimized for wdm applications where optic al amplifiers such as edfas and raman amplifier are used. the device connects to typical transimpedance amplifiers (tias). the linear signal from tias can contain significant amounts of noise that is unevenly distributed between top and bottom rails due to the ase noise generated by the optical amplifiers, crosstalk, or non-linear effect in the fiber. in order to optimize the ber in such noisy conditions, the decision threshold between bit 1 and bit 0, needs to be moved to the ra il that contains less noise. the sy88353bl features a pin at which an external voltage can be applied to move the crossing point up and down, from 20% to 80%, for ber optimization purposes. the sy88353bl operates from a single +3.3v power supply, over temperatures ranging from C40 o c to +85 o c. signals with data rates from 155mbps up to 3.2gbps, and as small as10mv pp , can be amplified to drive devices with cml or pecl inputs. the sy88353l features a loss-of-signal (los) open- collector ttl output. a programmable loss-of-signal level set pin (los lvl ) sets the sensitivity of the input amplitude detection. los asserts high if the input amplitude falls below the threshold sets by los lvl 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 st ability under a loss-of-signal condition. typically, 3.3db los hysteresis is provided to prevent chattering. all support documentation can be found on micrels web site at: www.micrel.com . features ? single 3.3v power supply ? fast los release/assert ? 155mbps to 3.2gbps operation ? low-noise cml data outputs ? chatter-free open-collector ttl loss-of-signal (los) output ? ttl /en input ? programmable los level set (los lvl ) ? programmable decision threshold ? available in a tiny 3mm x 3mm mlf ? package applications ? wdm systems ? gigabit ethernet, 1x and 2x fibre channel ? sonet/sdh: oc-3/12/24/48 C stm1/4/8/16 ? low-gain tia interface markets ? datacom/telecom ? optical transceiver downloaded from: http:///
micrel, inc. sy88353bl february 2007 2 m9999-021707-b hbwhelp@micrel.com or (408) 955-1690 typical application circuit programmable decision threshold fixed decision threshold ordering information part number package type operating range package marking lead finish SY88353BLMG mlf-16 industrial 353b wi th pb-free bar line indicator nipdau pb-free SY88353BLMGtr (1) mlf16 industrial 353b with pb-free bar line indicator nipdau pb-free note: 1. tape and reel. pin configuration 16-pin mlf ? (mlf-16) downloaded from: http:///
micrel, inc. sy88353bl february 2007 3 m9999-021707-b hbwhelp@micrel.com or (408) 955-1690 pin description pin number pin name type pin function 1 din data input true data input. 4 /din data input complementary data input. 5 vthn dc input tie this pin to pin 6 (vthref) and apply a dc voltage on pin 16 (vthp) for signal crossing adjustment. connect to ground if no crossing adjustment is needed. 6 vthref 1.25v reference voltage (referenced to ground) for decision threshold adjustment. 7 los open-collector ttl output loss-of-signal: asserts high when the data input amplitude falls below the threshold set by los lvl . 9 /dout cml output complementary data output. 12 dout cml output true data output. 14 loslvl input loss-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. 15 /en ttl input: default is high. /enable: this input enables the outputs when it is low. note that this input is internally connected to a 25k ? pull-up resistor and will default to a logic high state if left open. 16 vthp dc input apply a dc voltage from 0 to 2.4v to adjust the signal crossing level when pin 5 (vthn) is tied to pin 6 (vthref). 1.25v sets the crossing close to 50%. connect to ground if no crossing adjustment is needed. 2, 3, 10, 11 gnd ground device ground. 8, 13 vcc power supply positive power supply. downloaded from: http:///
micrel, inc. sy88353bl february 2007 4 m9999-021707-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 ) continuou s........................................................ 25ma /en voltage ............................................................0 to v cc v ref current .......................................... -800 a to +500a los lvl voltage................................................. v ref to v cc lead temperature (solderi ng, 20sec.) ................... +260c storage temperature (t s ) ....................... C65c to +150c operating ratings (2) supply voltage (v cc )............................. +3.0v to +3.6v ambient temperature (t a ) ................... C40c to +85c junction temperature (t j ) ................. C40c to +120c supply voltage (v cc ) ........................... +3.0v to +3.6v ambient temperature (t a ).................. C40c to +85c package thermal resistance (3) mlf ? ( ja ) still-air ............................................... 60c/w ( jb ) ........................................................... 33c/w dc electrical characteristics v cc = 3.0 to 3.6v; t a = C40c to +85c, typical values at v cc = 3.3v, t a = 25c. symbol parameter condition min typ max units i cc power supply current no output load 45 62 ma los lvl los lvl voltage v cc -1.3 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 -0.475 v cc -0.400 v cc -0.350 v v offset differential output offset 80 mv v thref decision threshold reference voltage 1.25 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 = 3.0 to 3.6v; t a = C40c to +85c, typical values at v cc = 3.3v, t a = 25c. symbol parameter condition min typ max units output signal crossing range lower limit 20 % output signal crossing range upper limit vthn connected to vthref and 0- 2.4v applied to vthp. 20 din 100(mvpp), see figure on page 6. 80 % v ih /en 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 i cex los output leakage current v out = v cc 100 a v ol los output low level sinking 2ma 0.5 v downloaded from: http:///
micrel, inc. sy88353bl february 2007 5 m9999-021707-b hbwhelp@micrel.com or (408) 955-1690 ac electrical characteristics v cc = 3.0 to 3.6v; r load = 50 ? to v cc ; t a = C40c to +85c, typical values at v cc = 3.3v, t a = 25c. symbol parameter condition min typ max units t r , t f output rise/fall time (20% to 80%) note 4 60 100 ps t jitter deterministic random note 5 note 6 15 5 ps pp ps rms v id differential input voltage swing 20 1800 mv pp v od differential output voltage swing note 4 700 800 950 mv pp t off los release time note 9 2 10 s t on los assert time note 9 2 10 s los al low los assert level r loslvl = 15k ? , note 7 9 mv pp los dl low los de-assert level r loslvl = 15k ? , note 7 13 mv pp hys l low los hysteresis r loslvl = 15k ? , note 8 3.2 db los am medium los assert level r loslvl = 5k ? , note 7 17 mv pp los dm medium los de-assert level r loslvl = 5k ? , note 7 25 mv pp hys m medium los hysteresis r loslvl = 5k ? , note 8 3.3 db los ah high los assert level r loslvl = 100 ? , note 7 47 mv pp los dh high los de-assert level r loslvl = 100 ? , note 7 70 mv pp hsy h high los hysteresis r loslvl = 100 ? , note 8 3.4 db b -3db 3db bandwidth 2.0 ghz a v(diff) differential voltage gain 38 db s 21 single-ended small-signal gain 26 32 db notes : 1. permanent device damage may occur if absolute maximum ratings are exceeded. this is a stress rating only and functional oper ation is not implied at conditions other than those detailed in the operational sections of this data sheet. exposure to absolute maximum ra tings conditions for extended periods may affect device reliability. 2. the data sheet limits are not guaranteed if t he device is operated beyond the operating ratings. 3. package thermal resistance assumes exposed pad is soldered (o r equivalent) to the devices most negative potential on the pcb . jb uses a 4-layer and ja in still-air number, unless otherwise stated. 4. amplifier in limiting mode. input is a 200mhz square wave. 5. deterministic jitter measured using 2.5gbps k28.5 pattern, v id = 10mv pp . 6. random jitter measured using 2.5gbps k28.7 pattern, v id = 10mv pp . 7. 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. 8. this specification defines el ectrical hysteresis as 20log (los de-assert/los assert). the rati o between optical hysteresis a nd electrical hysteresis is found to vary between 1.5 and 2, depending upon the leve l of received optical power and rosa characteristics. bas ed upon that ratio, the optical hysteresis corresponding to the electrical hysteresis range 1db-4.5 db, shown in the ac characteristics tabl e, will be 0.5db-3db optical hysteresis. 9. in real world applications, the los re lease/assert time can be strongly influenced by the rc time constant of the ac-couplin g 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 n umber of consecutive identical bits in t he application. typical values are in the range of 0.001f to 1.0f. downloaded from: http:///
micrel, inc. sy88353bl february 2007 6 m9999-021707-b hbwhelp@micrel.com or (408) 955-1690 typical operating characteristics v cc = 3.3v, t a = 25c, r l = 50 ? to v cc -2v, unless otherwise stated. los lvl resistor ( ? ) los lvl resistor ( ? ) downloaded from: http:///
micrel, inc. sy88353bl february 2007 7 m9999-021707-b hbwhelp@micrel.com or (408) 955-1690 functional characteristics v cc = 3.3v, t a = 25c, r l = 50 ? to v cc -2v, unless otherwise stated. downloaded from: http:///
micrel, inc. sy88353bl february 2007 8 m9999-021707-b hbwhelp@micrel.com or (408) 955-1690 functional block diagram detailed description the sy88353l limiting post amplifier operates from a single +3.3v power supply, over temperatures from C40c to +85c. signals with data rates from 155mbps up to 3.2gbps, and as small as 10mv pp , can be amplified. figure 1 shows the allowed input voltage swing. the sy88353l generates a los output that can be feedback to /en for output stability in the absence of a signal at the input. los lvl sets the sensitivity of the input amplitude detection. the amplifier features a signal crossing adjustment for ber optimization in optical links using optical amplifiers such in wdm applications. input amplifier/buffer figure 2 shows a simplified schematic of the input stage. the input amplifier a llows signals as small as 10mv pp to be detected and amplified. the input amplifier 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 sy88353bl outputs typically 800mv pp voltage-limited waveforms for input signals that are greater than 12mv pp . applications requiring the sy88353l to operate with high gain should have the upstream tia placed as close as possible to the sy88353bls input pins to ensure the best performance of the device. output buffer the sy88353bls cml output buffer is designed to drive 50 ? lines and is internally terminated with 50 ? to v cc . figure 3 shows a simplified schematic of the output stage. loss-of-signal the sy88353l generates a chatter-free loss-of-signal (los) open-collector, ttl output, as shown in figure 4. los is used to determine if the input amplitude is too small to be considered a valid input. los asserts high if the input amplitude falls below the threshold set by loslvl and de-asserts low otherwise. los can be fed back to the enable (/en) input to maintain output stability under a loss of signal condition. /en de-asserts low the true output signal without removing the input signals. typically, 3.3db 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 resistor between v cc and los lvl sets the voltage at los lvl . 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 sy88353l typically provides 3.3db los electrical hysteresis, which is defined as 20log (vin los-de-assert / vin los-assert ). since the relationship between the voltage out of the rosa and optical po wer at its input is linear, the optical hysteresis w ill be typically half of the electrical hysteresis reported in the datasheet. in practice, the ratio between electrical and optical hysteresis is found to be with in the range 1.5 to 1.8db. thus, 3.3db electrical hyst eresis will correspond to an optical hysteresis within the range 1.8 to 2.2db. downloaded from: http:///
micrel, inc. sy88353bl february 2007 9 m9999-021707-b hbwhelp@micrel.com or (408) 955-1690 signal crossing adjustment in order to optimize the decision threshold level and hence, the ber of the optical link, the sy88353l provides two pins for output signal crossing control. the signal crossing can be adju sted by connecting vthn (pin 5) to vthref (pin 6), and applying a dc signal at vthp (pin 16). by varying the dc signal at vthp from C 0v to 2.5v C while the input signal to the post amplifier is less than 100mvpp, the cr ossing of the output signal will change from 20% to 80% reaching 50% when vthp = vthref = 1.25v. if the crossing control function is not needed, vthn and vthp must be connected to ground. the zero crossing vs. vthp plot, shown on page 6, shows how the crossing of the output signal changes with the voltage applied at vthp (pin 16) while vthn (pin 5) is tied to vthref (pin 6) for different input signal levels. figure 1. v is and v id definition figure 2. input structure figure 3. output structure downloaded from: http:///
micrel, inc. sy88353bl february 2007 10 m9999-021707-b hbwhelp@micrel.com or (408) 955-1690 figure 4. los output structure figure 5. los lvl setting circuit note: recommended value for r loslvl is 15k ? or less. related product and su pport documentation part number function data sheet link an-45 notes on sensitivity and hysteresis in micrel post amplifiers http://www.micrel.com/produc t-info/app_hints+notes.shtml downloaded from: http:///
micrel, inc. sy88353bl february 2007 11 m9999-021707-b hbwhelp@micrel.com or (408) 955-1690 package information 16-pin (3mm x 3mm) mlf ? (mlf-16) 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 the information furnished by micrel in this data sheet is belie ved to be accurate and reliable. however, no responsibility is a ssumed by micrel for its use. micrel reserves the right to change circuitry and specificati ons at any time without notification to the customer. micrel products are not designed or authori zed for use as components in life support appliances, devices or systems where malfu nction of a product can reasonably be expected to result in personal injury. li fe 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 resul t in a significant injury to the user. a purchasers use or sale of micrel products for use in life s upport appliances, devices or systems is a pu rchasers own risk and purchaser agrees to fully indemnify micrel fo r any damages resulting from such use or sale. ? 2006 micrel, inco rporated. downloaded from: http:///

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