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sy88403bl 3.3v 4.25gbps cml low - power limiting post amplifier with ttl los micrel inc. ? 2180 fortune drive ? san jose, ca 95131 ? usa ? tel +1 (408) 944 - 0800 ? fax + 1 (408) 4 74 - 1000 ? http://www.micrel.com november 200 8 m9999 - 111808 -f hbwhelp@micrel.com or (408) 955 - 1690 general description the sy88403bl is a low - power limiting post amplifier optimized for copper applications. the device connects to typical transimpedance amplifiers (tias). the linear signal output from tias can contain significant amounts of noise and m ay vary in amplitude over time. the sy88403bl quantizes these signals and outputs typically 800mv pp voltage - limited waveforms. the sy88403bl operates from a single +3.3v 10% power supply, over an industrial temperature range of C 40c to +85c. with its wide bandwidth and high gain, signals with data rates up to 4.25gbps and as small as 5 mv pp can be amplified to drive devices with cml inputs or ac - coupled pecl inputs. the sy88403bl incorporates a loss - of - signal (los) open - collector ttl output with internal 4.75k pull - up resistor. 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. 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 output signal without removing the input signal. typically, 3.5db los hysteresis is provided to prevent chattering. all support documentation can be found on micrels web site at: www.micrel.com . typical performance features ? multi - rate up to 4.25gbps operation ? 5 mv pp input sensitivity ? low noise 50 ? cml data outputs C 800mv pp output swing C 60ps edge rates C 1ps rms typ. random jitter C 10ps pp typ. deterministic jitter ? chatter - free loss - of - signal (los) output C 3.5db electrical hysteresis C oc - ttl output with internal 4.75k ? pull - up resistor ? pro grammable los sensitivity using single external resistor ? internal 50 ? data input termination ? ttl /en input allows feedback from los ? wide operating range: C single 3.3v 10% power supply C industrial temperature range: C 40c to +85c ? available in a 10 - pin epad - msop and 16 - pin qfn package applications ? 1.062gbps, 2.125gbps and 4.25gbps fibre channel ? cable driver ? small form factor (sff) and small form factor pluggable (sfp) transceivers ? high - gain line driver and line receiver markets ? copper interconnect ? da tacom and telecom ? storage area network (san) downloaded from: http:///
micrel, inc. sy88403bl november 2008 2 m9999 - 111808 -f hbwhelp@micrel.com or (408) 955 - 1690 typical application functional block diagram downloaded from: http:///
micrel, inc. sy88403bl november 2008 3 m9999 - 111808 -f hbwhelp@micrel.com or (408) 955 - 1690 ordering information (1) part number package type operating range package marking lead finish sy88403bley k10-2 industrial 403b with pb- free bar - li ne indicator matte -sn sy88403bleytr (2) k10-2 industrial 403b with pb- free bar - line indicator matte -sn SY88403BLMG qfn - 16 industrial 403b with pb- free bar - line indicator nipdau pb-free SY88403BLMGtr (2) qfn - 16 industrial 403b with pb- free bar - line in dicator nipdau pb-free notes: 1. contact factory for die availability. dice are guaranteed at t a = 25c, dc electricals only. 2. tape and reel. pin configuration 10 - pin epad - msop (k10 - 2) 16 -pin qfn downloaded from: http:///
micrel, inc. sy88403bl november 2008 4 m9999 - 111808 -f hbwhelp@micrel.com or (408) 955 - 1690 pin description qfn pin number epad- msop pin number pi n name type pin function 1, 4 2, 3 din, /din differential data input differential data input. each pin internally terminates to ref through 50 ?. 2, 3, 10, 11 exposed pad 6 exposed pad gnd ground device ground. exposed pad must be soldered (or equivalent ) to the same potential as the ground pins. 5, 8, 13, 16 10 vcc power supply positive power supply. bypass with 0.1f||0.01f low esr capacitors. 0.01f capacitors should be as close as possible to vcc pin. 6 4 vref reference voltage. bypass with 0.01f low esr capacitor from v ref to v cc to stabilize los lvl and v ref . 7 7 los open collector ttl o utput with internal 4.75k ? pull - up resistor loss - of - signal: asserts high when the data input amplitude falls below the threshold set by loslvl. 9, 12 9, 8 dout, /dout differential cml output differential data output. 14 5 loslvl input: default is maxim um sensitivity. loss - of - signal level set: a resistor from this pin to vcc sets the threshold for the data input amplitude at which the los output will be asserted. 15 1 /en ttl input: default is high. enable bar: de - asserts true data output when high. i ncorporates 25k ? pull - up to v cc . downloaded from: http:///
micrel, inc. sy88403bl november 2008 5 m9999 - 111808 -f hbwhelp@micrel.com or (408) 955 - 1690 absolute maximum ratings (1) supply voltage (v cc ) ............................... 0v to +7.0v /en, loslvl voltage .................................... 0 to v cc ref current ...................................................... 1ma los current ...................................................... 5ma dout, /dout current .................................... 25ma din, /din current ............................................ 10ma lead temperature (soldering, 20sec.) ............. 260c st orage temperature (t s ) ............... C 65c to +150c operating ratings (2) supply voltage (v cc ) ........................... +3.0v to +3.6v ambient temperature (t a ) ................ C 40c to +85c junction temperature (t a ) .............. C 40c to +120c package 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; 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 3.3v, note 4 25 42 ma 3 .3v, note 5 41 62 ma v ref ref voltage v cc C 1.3 v v loslvl loslvl voltage range v ref v cc v v oh dout, /dout high voltage note 6 v cc C 0.020 v cc C 0.005 v cc v v ol dout, /dout low voltage 3.3v, note 6 v cc C 0.475 v cc C 0.400 v cc C 0.350 v v od_dc dc differ ential output voltage note 6 700 800 950 mv v offset differential output offset 80 mv z o single - ended output impedance 40 50 60 ? z i single - ended input impedance 40 50 60 ? ttl dc electrical characteristics v cc = +3.0v to +3.6v; t a = C 40c to +85c. symbol parameter condition min typ max units v oh los output high level sourcing 100a 2.4 v cc v v ol los output low level sinking 2ma 0.5 v 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 C 0.3 ma notes: 1. permanent device damage may occur if ratings in the absolute maximum ratings secti on are exceeded. this is a stress rating only and functional operation is not implied for conditions other than those detailed in the operational secti ons of this data sheet. exposure to absolute maximum ratings condit ions 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. thermal performance assumes are of 4 - layer pcb. exposed pad must be soldered (or equivalent) to the device's most negative potential on the pcb. 4. excludes current of cml output stage. see detailed description. 5. total device current with no output load. 6. output levels are based on a 50 ? to v cc load impedance. if the load impedance is different, the output level will be changed . amplifier is in limiting mode. measured at 155mbps with 20mvpp input and prbs - 23 data pattern and 50 ? load. downloaded from: http:///
micrel, inc. sy88403bl november 2008 6 m9999 - 111808 -f hbwhelp@micrel.com or (408) 955 - 1690 ac electrical char acteristics v cc = +3.0v to +3.6v; t a = C 40c to +85c; r l = 50 ? to v cc ; 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 7 60 120 ps t jitter deterministic random note 8 note 9 10 1 ps pp ps rms v id differential input voltage swing see figure 1 5 1800 mv pp v od _ac ac differential output voltage note 10 6 00 800 950 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 1 1 8 mv pp los dl low los de - assert level r loslvl = 15k ?, note 1 1 12 mv pp hsy l low los hysteresis r loslvl = 15k ?, note 1 2 2 3.5 4.5 db los am medium los assert level r loslvl = 5k ?, note 1 1 12 17 mv pp los dm medium los de - assert level r loslvl = 5k ?, note 1 1 25 33 mv pp hsy m medium los hysteresis r loslvl = 5k ?, note 1 2 2 3.5 4.5 db los ah high los assert level r loslvl = 100 ?, note 1 1 34 47 mv pp los dh high los de - assert level r loslvl = 100 ?, note 1 1 70 83 mv pp hsy h high los hysteresis r loslvl = 100 ?, note 1 2 2 3.5 4.5 db v sr los sensitivity range 20 35 mv pp a v(diff) differential voltage gain 32 38 db s 21 single - ended small - signal gain 26 32 db notes: 7. amplifier in limiting mode. input is a 200mhz square wave. 8. deterministic jitter measured using 4.25gbps k28.5 pattern, v id = 20mv pp . 9. random jitter measured using 4.25gbps k28.7 pattern, v id = 20mv pp . 10. differential output swing measured at 4.25gbps with 20mvpp input and prbs - 23 data pattern and 50 ? load . 11. 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. 12. 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 on the level of received optical power and rosa characterist ics. base d on that ratio, the optical hysteresis corresponding to the electrical hysteresis range 2 db - 4.5 db s hown in the ac characteristics table will be 0.5db - 3db optical hysteresis. downloaded from: http:///
micrel, inc. sy88403bl november 2008 7 m9999 - 111808 -f hbwhelp@micrel.com or (408) 955 - 1690 typical operating characteristics 25 30 35 40 45 50 55 60 -40 -15 10 35 60 85 temperature (c) power supply current vs. temperature 700 720 740 760 780 800 820 840 860 880 900 -40 -15 10 35 60 85 temperature (c) differential output voltage swing vs. temperature (amplifier in limiting mode) 0 100 200 300 400 500 600 700 800 900 0 5 10 15 20 25 30 35 40 45 50 v id (mv pp ) differential output voltage swing vs. differential input voltage swing r loslvl (k ) r loslvl (k ) downloaded from: http:///
micrel, inc. sy88403bl november 2008 8 m9999 - 111808 -f hbwhelp@micrel.com or (408) 955 - 1690 detailed description the sy88403bl low - power limiting post amplifier operates from a single +3.3v power supply, over temperatures from C 40c to +85c. signals with data rates up to 4.25gbps and as small as 5 mv pp can be amplified. figure 1 shows the allowed input voltage swing. the sy88403bl generates an los output, allowing feedback to /en for output stabilit y. loslvl sets the sensitivity of the input amplitude detection. input amplifier/buffer the sy88403bls inputs are internally terminated with 50 ? to ref. if not affected by this internal termination scheme, upstream devices need to be ac - coupled to the sy 88403bl's inputs. figure 2 shows a simplified schematic of the input stage. the high - sensitivity of the input amplifier allows signals as small as 5 mv pp to be detected and amplified. the input amplifier allows input signals as large as 1800mv pp . input signals are linearly amplified with a typically 38db differential voltage gain. since it is a limiting amplifier, the sy88403bl outputs typically 800mv pp voltage - limited waveforms for input signals that are greater than 20mv pp . applications requiring the sy88403bl to operate with high - gain should have the upstream tia placed as close as possible to the sy88403bls input pins to ensure the best performance of the device. output buffer the sy88403bls cml output buffer is designed to drive 50 ? lines. the output b uffer requires appropriate termination for proper operation. an external 50 ? resistor to v cc or equivalent for each output pin provides this. figure 3 shows a simplified schematic of the output stage and includes an appropriate termination method. of course, driving a downstream device with a cml input that is internally terminated with 50 ? to v cc eliminates the need for external termination. as noted in the previous section, the amplifier outputs typically 800mv pp waveforms across 25 ? total loads. the outp ut buffer thus switches typically 16ma tail - current. figure 4 shows the power supply current measurement, which excludes the 16ma tail - current. loss - of - signal the sy88403bl incorporates a chatter - free loss - of - signal (los) open - collector ttl output with in ternal 4.75k ? pull - up resistor as shown in figure 5. los is used to determine that 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 3.5db los hysteresis is provided to prevent chattering. l oss - of - signal level set a programmable loss - of - signal level set pin (loslvl) sets the threshold of the input amplitude detection. connecting an external resistor between v cc and loslvl sets the voltage at loslvl. this voltage ranges from v cc to v ref . the external resistor creates a voltage divider between v cc and vref as shown in figure 6. if desired, an appropriate external voltage may be applied rather than using a resistor. the relationship between v loslvl and r loslvl is given by: ? ?? ? ? ?? ? + ? = 2.8 r r 1.3 v v loslvl loslvl cc loslvl where voltages are in volts and resistances are in k ?. the smaller the external resistor, implying a smaller voltage difference from loslvl to vcc, lowers the los sensitivity. hence, larger input amplitude is required to de - assert los. typical opera ting characteristics contains graphs showing the relationship between the input amplitude detection sensitivity and r loslvl . hysteresis the sy88403bl provides typically 3.5db los electrical hysteresis. by definition, a power ratio measured in db is 10log (power ratio). power is calculated as v in 2 /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 linearly with the optical power and hence the ratios change linea rly. therefore, the optical hysteresis in db is half the electrical hysteresis in db given in the datasheet. the sy88403bl provides typically 1.75db los optical hysteresis. as the sy88403bl is an electrical device, this datasheet refers to hysteresis in electrical terms. with 3.5db los hysteresis, a voltage factor of 1.5 is required to de - assert los. downloaded from: http:///
micrel, inc. sy88403bl november 2008 9 m9999 - 111808 -f hbwhelp@micrel.com or (408) 955 - 1690 figure 1. v is and v id definition figure 2. input structure figure 3. output structure downloaded from: http:///
micrel, inc. sy88403bl november 2008 10 m9999 - 111808 -f hbwhelp@micrel.com or (408) 955 - 1690 figure 4. power supply current measurement figure 5. los output structure figure 6. loslvl setting circuit related product and support documentation part number function data sheet link application notes notes on sensitivity and hysteresis in micrel post amplifier www.micrel.com/product - info/app_hints+notes.shtml downloaded from: http:///
micrel, inc. sy88403bl november 2008 11 m9999 - 111808 -f hbwhelp@micrel.com or (408) 955 - 1690 package information 16 - pin qfn pcb thermal consideration for 16 -pin qfn package (always solder, or equivalent, the exposed pad to the pcb) package notes: 1. package meets level 2 qualification. 2. all parts are dry - packa ged before shipment. 3. exposed pads must be soldered to a ground for proper thermal management. downloaded from: http:///
micrel, inc. sy88403bl november 2008 12 m9999 - 111808 -f hbwhelp@micrel.com or (408) 955 - 1690 10 - pin epad - msop (k10 - 2) micrel, inc. 2180 fo rtune 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 believed to be accurate and reliable. however, no responsibility is assumed by micrel for its use. micrel reserves the right to change circuitry and specifications at any ti me without notification to the customer. micrel products are not designed or authorized for use as components in life support appliances, devices or sy stems where mal f unction of a product can reasonably be expected to result in personal injury. life support devices or s ystems 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 b e reasonably expected to result in a significant injury to the user. a purchasers use or sale of micrel products for use in life support appliances, devices or systems is a purchas ers own risk and purchaser agrees to fully indemnify micrel for any damages resulting from such use or sale. ? 2005 micrel, incorporated. downloaded from: http:///

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