View SY88305BLEY_1661150.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

sy88305bl 3.3v, 3.2gbps cml limiting post amplifier with wide signal - detect range 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 2007 m9999 - 110207-a hbwhelp@micrel.com or (408) 955 - 16 90 general description the sy88305bl low - power limiting post amplifiers are designed for use in fiber - optic receivers. these devices connect to typical transimpedance amplifiers (tias) . th e linear signal output from tias can contain significant amounts of no ise and may vary in amplitude over time. the sy88305bl quantizes these signals and output cml - level waveforms. the sy88305bl operates from a single +3.3v power supply, over temperatures ranging from ? 40 o c to +85 o c. with their wide bandwidth and high gain, signals with data rates up to 3.2gbps, and as small as 10mv pp , can be amplified to drive devices with cml/pecl inputs. the device generates a signal detect (sd) open - collector ttl output. the sd function is optimized to detect a larger and wider input rang e, as shown in the characteristic curve on page 6. a programmable signal - detect level set pin (sd lvl ) sets the sensitivity of the input amplitude detection. sd asserts high if the input amplitude rises above the threshold sets by sd lvl and de - asserts low otherwise. the sd output can be fed back to the en input to maintain stability. typically, 3.5db los/sd hysteresis is provided to prevent chattering. datasheet and support documentation can be found on micrel?s web site at: www.micrel.com . features ? signal detect circuit optimized to detect a wide input range ? chatter - free open - collector ttl signal - detect (sd) ? single 3.3v power supply ? 155mbps to 3.2gbps operation ? low - noise cml data outputs ? programmable sd level set ( sd lvl ) ? available in a tiny 10 - pin epad - msop and 16 - pin qfn package applications ? pon ? gigabit ethernet ? 1x and 2x fibre channel ? sonet/sdh: oc - 3/12/24/48 ? stm 1/4/8/16 ? high - gain line driver and line receiver markets ? fttx ? optical transceivers ? datacom/tele com ? low - gain tia interface ? long- reach fom
micrel, inc. sy88305bl november 2007 2 m9999- 110207-a hbwhelp@micrel.com or (408) 955 - 1690 typical application pin configuration 10- pin epad - msop (k10 -2) 16 - pin qfn ordering information part number package type operating range package marking lead finish SY88305BLEY k10 -2 ind ustrial 305b with pb - free bar line indicator matte -sn pb - free SY88305BLEYtr (1) k10 -2 industrial 305b with pb - free bar line indicator matte -sn pb - free sy88305blmg qfn -16 industrial 305b with pb - free bar line indicator nipdau pb - free sy88305blmgtr (1) qfn -16 industrial 305b with pb - free bar line indicator nipdau pb - free note: 1. tape and reel.
micrel, inc. sy88305bl november 2007 3 m9999- 110207-a 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: de - asserts true data output w hen low. 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 sd lvl . 5 14 sdlvl input si gnal - detect level set: a resistor from this pin to v cc sets the threshold for the data input amplitude at which the sd output will be asserted. 6 exposed pad 2, 3, 10, 11 exposed pad gnd ground device ground. exposed pad must be connected to pcb ground pl ane. 7 7 sd open collector ttl output signal - detect: asserts high when the data input amplitude rises above the threshold sets by sd lvl . for pr oper operation, install an external 4.75k ? pull - up resistor at this output. 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 power supply.
micrel, inc. sy88305bl november 2007 4 m9999- 110207-a hbwhelp@micrel.com or (408) 955 - 1690 absolute maximum ratings (1) s upply voltage (v cc ) .................................... 0v to +4.0v input voltage (din, /din) ................................... 0 to v cc output current (i out ) continuous ..................................................... + 50ma surge ........................................................... + 100ma /en voltage ........................................................ 0 to v cc v ref current ....................................... - 800 a to +500 a 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 +125c junction thermal resistance (3) epad - msop ja (still - air) .............................................. 38 o c/w jb ............................................................ 22 o c/w qfn ja (still - air) .............................................. 61 o c/w jb ............................................................ 38 o c/w dc electrical characteristics v cc = 3.0v to 3.6v; r l = 50 ? to v cc ; t a = ? 40c to +85c; typical values at v cc = 3.3v, t a = 25 o c. symbol parameter condition min typ max un its i cc power supply current no output load 38 60 ma v sdlvl sd lvl 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 - 0.475 v cc - 0.4 v cc - 0.350 v v offset differential output offset + 80 mv v re f reference voltage v cc - 1.48 v cc - 1.32 v cc - 1.16 v z i single - ended input impedance 40 50 60 ? ttl dc electrical characteristics v cc = 3.0v to 3.6v; t a = ? 40c to +85c. symbol parameter condition min typ max units 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 -300 a i oh sd output leakage v oh = 3.6v 100 a v ol sd output low level i ol = +4ma 0.5 v notes: 1. permanent device damage may occur if absolute maximum ratings are exceeded. this is a stress rating only an d functional operation is not implied at conditions other than those detailed 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 n ot guaranteed if the device is operated beyond the operating ratings. 3. thermal performance assumes the use of a 4 - layer pcb. exposed pad must be soldered (or equivalent) to the device?s most negative potential on the pcb.
micrel, inc. sy88305bl november 2007 5 m9999- 110207-a hbwhelp@micrel.com or (408) 955 - 1690 ac electrical characteristic s v cc = 3.0v to 3.6v; r l = 50 ? to v cc ; t a = ? 40c 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 60 120 ps t jitter deterministic random note 5 note 6 15 5 ps pp ps rms v id differenti al input voltage swing figure 1 10 1800 mv pp v od differential output voltage swing v id > 12mv pp , figure 1 700 800 950 mv pp t off sd assert time 2 10 s t on sd de - assert time 2 10 s sd al low sd assert level r sdlvl = 15k ?, note 8 27 mv pp sd dl low sd de - assert level r sdlvl = 15k ?, note 8 18 mv pp hys l low sd/los hysteresis r sdlvl = 15k ?, note 7 3.4 db sd am medium sd assert level r sdlvl = 5k ?, note 8 53 80 mv pp sd dm medium sd de - assert level r sdlvl = 5k ?, note 8 21 36 mv pp hys m medium sd/lo s hysteresis r sdlvl = 5k ?, note 7 2 3.5 6 db sd ah high sd assert level r sdlvl = 100 ?, note 8 137 200 mv pp sd dh high sd de - assert level r sdlvl = 100 ?, note 8 70 94 mv pp hys h high sd/los hysteresis r sdlvl = 100 ?, note 7 2 3.5 6 db b - 3db 3db bandwidth 2 ghz a v(diff) differential voltage gain 39 db s 21 single - ended small - signal gain 26 33 db notes: 4. amplifier in limiting mode. input is a 200mhz, 100mvpp 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 up on the level of received optical power and rosa characteristics. based upon that ratio, the optical hysteresis corresponding to the electrical hysteresis range 2db - 6db, shown in the ac characteristics table, will be 1db - 3db optical hysteresis. 8. see ?typical operating characteristics? for a graph showing how to choose a particular r for a particular los assert and its associated de - assert amplitude.
micrel, inc. sy88305bl november 2007 6 m9999- 110207-a hbwhelp@micrel.com or (408) 955 - 1690 typical operating characteristics functional characteristics
micrel, inc. sy88305bl november 2007 7 m9999- 110207-a hbwhelp@micrel.com or (408) 955 - 1690 functional block dia gram detailed description the sy88305bl low - p ower limiting post amplifiers operate 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 t he allowed input voltage swing. the sy88305bl generates an sd output allowing feedback to en for output stability. sd lvl sets the sensitivity of the input amplitude detection. 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 10mv pp to be amplified. the input amplifier also allows input signals as large as 1800mv pp . input signals below 12mvpp are linearly amplified with a typical 42db differential voltage g ain. since it is a limiting amplifier, these devices output typically 800mv pp voltage - limited waveforms for input signals greater than 12mv pp . applications requiring the sy88305bl to operate with strong signals should have the upstream tia placed as close as possible to the devices? input pins. this ensures the best performance of the device. output buffer the sy88305bl cml output buffers are 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 the output stage. signal detect the sy88305bl generates a chatter - free sd open - collector ttl output, as shown in figure 4. sd asserts high if the input amplitude rises above the threshold sets by sd lvl and de - asserts low otherwise. the sd output can be fed back to the en input to maintain stability signal - detect level set programmable sd level set pin (sd lvl ) sets the threshold of the input amplitude detection. co nnecting an external resistor between v cc and sd lvl set the voltage at sd 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 5. hysteresis the sy88305bl typically provides 3.5d b sd electrical hysteresis. 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 volta ge input changes linearly 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 datasheet. since the sy88305bl are electrical devices, this data sheet refer s to hysteresis in electrical terms. with 3.5db sd hysteresis, a voltage factor of 1.5 is required to assert or de- assert sd.
micrel, inc. sy88305bl november 2007 8 m9999- 110207-a hbwhelp@micrel.com or (408) 955 - 1690 figure 1. v is and v id figure 2. input structure figure 3. output structure figure 4. sd output structure figure 5. sd lvl setting circuit
micrel, inc. sy88305bl november 2007 9 m9999- 110207-a hbwhelp@micrel.com or (408) 955 - 1690 package information 10- pin epad - msop (k10 -2)
micrel, inc. sy88305bl november 2007 10 m9999- 110207-a hbwhelp@micrel.com or (408) 955 - 1690 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 quali fication. 2. all parts are dry - packaged before shipment. 3. exposed pad must be soldered to a ground for proper thermal management, solder void has to be less than 50% of the epad area.
micrel, inc. sy88305bl november 2007 11 m9999- 110207-a 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 the information furnished by micrel in this data sheet is believed to be accurate and r eliable. however, no responsibility is assumed by micrel for its use. micrel reserves the right to change circuitry and specifications at any time without notification to the customer. micrel products are not designed or authorized for use as components i n 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 implant into the body or (b) sup port or sustain life, and whose failure to perform can be reasonably expected to result 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 p urchaser agrees to fully indemnify micrel for any damages resulting from such use or sale. ? 2007 micrel, incorporated.

▲Up To Search▲

Price & Availability of SY88305BLEY

	To Download SY88305BLEY Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .