View SY88303BL_1343856.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

SY88303BL 3.3v, 3.2gbps cml limiting post amplifier with wide loss - of - signal detection range micrel inc. ? 2180 fortune drive ? san jose, ca 95131 ? usa ? tel +1 (408) 944 - 0800 ? fax + 1 (408) 474 - 1000 ? http:www.micr el.com november 2007 m9999 - 110207-a hbwhelp@micrel.com or (408) 955 - 1690 general description the SY88303BL 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 SY88303BL quantizes these signals and output cml - level waveforms. the SY88303BL 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 loss - of - signal (los) open - collector ttl output. the los function is optimized to detect a wide input range, as sho wn in the typical operating characteristic curve on page 6. 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 stability under a loss - of - signal condition. typically, 3.5db los hyst eresis is provided to prevent chattering. datasheet and support documentation can be found on micrel?s web site at: www.micrel.com . features ? loss - of - signal detection circuit optimized to detect a wide input range ? c hatter - free open - collector ttl loss - of - signal (los) output ? single 3.3v power supply ? 155mbps to 3.2gbps operation ? low - noise cml data outputs ? programmable los level set (los 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/telecom ? low - gain tia interface ? long- reach fom
micrel, inc. SY88303BL november 2007 2 m9999- 110207-a hbwhelp@micrel.com or (4 08) 955 - 1690 typical application pin configurati on 10 - pin epad - msop (k10 - 2) 16 - pin qfn ordering information part number package type operating range package marking lead finish SY88303BLey k10 -2 industrial 303b with pb - free bar line indicator matte -sn pb - free SY88303BLeytr (1) k10 -2 industrial 30 3b with pb - free bar line indicator matte -sn pb - free SY88303BLmg qfn -16 industrial 303b with pb - free bar line indicator nipdau pb - free SY88303BLmgtr (1) qfn -16 industrial 303b with pb - free bar line indicator nipdau pb - free note: 1. tape and reel.
micrel, inc. SY88303BL november 2007 3 m9999- 110207-a hbwhelp@micrel.com or (4 08) 955 - 1690 pin d escription pin number (msop) pin number ( qfn ) pin name type pin function 1 15 /en ttl input: default is low. enable bar: de - asserts true data output when high. 2 1 din data input true data input with 50 ? termination to v ref . 3 4 /din data input complem entary data input w50 ? termination to v ref . 4 6 vref reference voltage: placing a capacitor here to v cc helps stabilize. 5 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 the los 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 plane. 7 7 los open collector ttl output loss -of - signal: asserts high when the data input amplitude falls below the threshold sets by los lvl . for proper 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. SY88303BL november 2007 4 m9999- 110207-a hbwhelp@micrel.com or (4 08) 955 - 1690 absolute maximum rating s (1) supply 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 los lvl voltage .............................................. v ref to v cc lead temperature (soldering, 20sec.) .................. 260c storage t emperature (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 cw jb ............................................................. 22 o cw qfn ja (still - air) ............................................... 61 o cw jb ............................................................. 38 o cw 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 units i cc power supply current no output load 38 60 ma v loslvl los 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 ref refe rence 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 los output leakage v oh = 3.6v 100 a v ol los 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 o nly and 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 not 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. SY88303BL november 2007 5 m9999- 110207-a hbwhelp@micrel.com or (4 08) 955 - 1690 ac electrical characte ristics 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 los de - assert time 2 10 s t on los assert time 2 10 s los dl low los de - assert level r = 15k ?, note 8 27 mv pp los al low los assert level r = 15k ?, note 8 18 mv pp hys l low los hysteresis r = 15k ?, note 7 3.4 db los dm medium los de - assert level r = 5k ?, note 8 53 80 mv pp los am medium los assert level r = 5k ?, note 8 21 36 mv pp hys m los hysteresis r = 5k ?, note 7 2 3.5 6 db los dh high los de - assert level r = 100 ?, note 8 137 200 mv pp los ah high los assert level r = 100 ?, note 8 70 94 mv pp hys h high los hysteresis r = 100 ?, note 7 2 3.5 6 db b - 3db 3db bandwidth 2 ghz a v(diff) differential voltage gain 3 9 db s 21 single - ended small - signal gain 26 33 db notes: 4. amplifier in limiting mode. input is a 200mhz, 100mv pp 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 i d = 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 ros a 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 showin g how to choose a particular r loslvl for a particular los assert and its associated de- assert amplitude.
micrel, inc. SY88303BL november 2007 6 m9999- 110207-a hbwhelp@micrel.com or (4 08) 955 - 1690 typical operating characteristics functional characteristics
micrel, inc. SY88303BL november 2007 7 m9999- 110207-a hbwhelp@micrel.com or (4 08) 955 - 1690 functional block diagram detailed description the SY88303BL lo w - 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 the allowed input voltage swing. the SY88303BL g enerates a los output allowing feedback to /en for output stability. los 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 gain. 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 SY88303BL 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 SY88303BL 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 provid es this. figure 3 shows a simplified schematic of the output stage. loss - of - signal the SY88303BL generates a chatter - free los open - collector ttl output, as shown in figure 4. los is used to determine that the input amplitude is large enough to be considere d a valid input. los asserts high if the input amplitude falls below the threshold sets 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 output signal without removing the input signals. loss - of - signal level set 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 set 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 5. hysteresis the SY88303BL typically provides 3.5db los electrical hysteresis. by definition, a power ratio measured in db i s 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 linearly with the optical power and therefore, the rat ios change linearly. thus, the optical hysteresis in db is half the electrical hysteresis in db given in the data sheet. since the SY88303BL is an electrical device, this data sheet refers to hysteresis in electrical terms. with 3.5db los hysteresis, a vol tage factor of 1.5 is required to assert or de- assert los.
micrel, inc. SY88303BL november 2007 8 m9999- 110207-a hbwhelp@micrel.com or (4 08) 955 - 1690 figure 1. v is and v id figure 2. input structure figure 3. output structure figure 4. los output structure figure 5. los lvl setting circuit
micrel, inc. SY88303BL november 2007 9 m9999- 110207-a hbwhelp@micrel.com or (4 08) 955 - 1690 package information 10- pin epad - msop (k10 -2)
micrel, inc. SY88303BL november 2007 10 m9999- 110207-a hbwhelp@micrel.com or (4 08) 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 qualification. 2. all parts are dry - packaged before shipment. 3. exposed pad must be sold ered to a ground for proper thermal management, solder void has to be less than 50% of the epad area.
micrel, inc. SY88303BL november 2007 11 m9999- 110207-a hbwhelp@micrel.com or (4 08) 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 reliable. however, no responsibility is assumed by micrel for its use. micrel reserves the right to change circuitry and specifications at any t ime 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 supp ort 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. ? 2007 micrel, incorporated.

▲Up To Search▲

Price & Availability of SY88303BL

	To Download SY88303BL Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .