1 sy88913v micrel, inc. m9999-071310 hbwhelp@micrel.com or (408) 955-1690 description 3.3v and 5v power supply options up to 1.5gbps operation low power low noise chatter-free /los generation pecl /los output ttl /en input differential pecl inputs for data /en input is ttl with internal 27k pull up single power supply designed for use with micrel-synergy laser diode driver and controller available in a tiny 10-pin (3mm) msop the sy88913v limiting post amplifer with its high gain and wide bandwidth is ideal for use as a post amplifer in fber-optic receivers with data rates up to 1.5gbps. signals as small as 5mvp-p can be amplifed to drive devices with pecl inputs. the sy88913v generates a chatter-free pecl loss of signal (/los) output. the sy88913v incorporates a programmble level detect function to identify when the input signal has been lost. this information can be fed back to the /en input of the device to maintain stability under loss of signal conditions. using los lvl pin the sensitivity of the level detect can be adjusted. the los lvl voltage can be set by connecting a resistor divider between v cc and v ref , figure 2. figure 3 and 4 show the relationship between input level sensitivity and the voltage set on los lvl . features 5v/3.3v 1.25g bps h igh-speed limiting post amplifier sy88913v applications 1.25gbps gigabit ethernet 531mbps and 1062mbps fibre channel 622mbps sonet gigabit interface converter block diagram rev.: d amendment: /0 issue date: july 2010
2 sy88913v micrel, inc. m9999-071310 hbwhelp@micrel.com or (408) 955-1690 package/ordering information 16-pin msop (k10-1) ordering information package operating package lead part number type range marking finish sy88913vkc k10-1 commercial 913v sn-pb sy88913vkctr (1) k10-1 commercial 913v sn-pb sy88913vkg k10-1 industrial 913v with pb-free pb-free bar-line indicator nipdau sy88913vkgtr (1) k10-1 industrial 913v with pb-free pb-free bar-line indicator nipdau note: 1. tape and reel. general the sy88913v is an integrated limiting amplifier intended for high-frequency fber-optic applications. the circuit connects to typical transimpedance amplifers found within a fber-optics link. the linear signal output from a transimpedance amplifer can contain signifcant amounts of noise, and may vary in amplitude over time. the sy88913v limiting amplifer quantizes the signal and outputs a voltage- limited waveform. the ttl /en pin allows the user to disable the signal without removing the input signal. general description pin type function d in data input data input /d in data input inverting data input los lvl input loss of signal level set /en ttl input output enable (active low) /los pecl output loss of signal indicator (active low) gnd ground ground d out pecl output data output /d out pecl output inverting data output v cc power supply positive power supply v ref output reference voltage output for los level set (see fig. 2) pin names
3 sy88913v micrel, inc. m9999-071310 hbwhelp@micrel.com or (408) 955-1690 symbol rating value unit v cc power supply voltage 0 to +7.0 v d in , /d in input voltage 0 to v cc v d out , /d out , /los output voltage (with 50? load) v cc C2.5 to v cc +0.3 v los lvl input voltage 0 to v cc v v ref output voltage v cc C2.0 to v cc v t a operating temperature range C40 to +85 c t store storage temperature range C55 to +125 c absolute maximum ratings (1) note: 1. permanent device damage may occur if absolute maximum ratings are exceeded. this is a stress rating only and functional operation is not implied at conditions other than those detailed in the operational sections of this data sheet. exposure to absolute maximum ratlng conditions for extended periods may affect device reliability. t a = C40c t a = 0c t a = +25c t a = +85c symbol parameter min. max. min. max. min. typ. max. min. max. unit i cc power supply 5v 35 35 21 35 40 ma current (1) 3.3v 35 35 23 35 40 i il /en input low current C0.3 (5) C0.3 (5) C0.3 (5) C0.3 (5) ma i ih /en input high current 20 (2) 20 (2) 20 (2) 20 (2) a 100 (3) 100 (3) 100 (3) 100 (3) v cmr common mode range gnd +2.0 v cc C1.0 gnd +2.0 v cc C1.0 gnd +2.0 v cc C1.0 gnd +2.0 v cc C1.0 v v offset differential output offset 160 160 40 160 160 mv los lvl los lvl level v ref v cc v ref v cc v ref v cc v ref v cc v v oh d out and /d out v cc C1085 v cc C880 v cc C1025 v cc C880 v cc C1025 v cc C955 v cc C880 v cc C1025 v cc C880 mv high output v ol d out and /d out v cc C1830 v cc C1555 v cc C1810 v cc C1620 v cc C1810 v cc C1705 v cc C1620 v cc C1810 v cc C1620 mv low output v ref reference supply (4) v cc C1.38 v cc C1.26 v cc C1.38 v cc C1.26 v cc C1.38 v cc C1.32 v cc C1.26 v cc C1.38 v cc C1.26 v v ih /en input high voltage 2.0 2.0 2.0 2.0 v v il /en input low voltage 0.8 0.8 0.8 0.8 v notes: 1. no output load. 2. v in = 2.7v. 3. v in = v cc . 4. i ref must be limited to be within C0.8ma (source) and 0.5ma (sink). 5. v in = 0.5v. dc electrical characteristics v cc = +3.3v 10% or +5v 10%, r load = 50? to v cc C2v t junction max junction temperature 125 c
4 sy88913v micrel, inc. m9999-071310 hbwhelp@micrel.com or (408) 955-1690 t a = C40c t a = 0c t a = +25c t a = +85c symbol parameter min. max. min. max. min. typ. max. min. max. unit conditions psrr power supply (1) 35 db input referred, rejection ratio 55mhz v id input voltage range 5 1800 5 1800 5 1800 5 1800 mv pp v od differential output 700 mv v id = 15mv pp voltage swing (2) 200 200 200 250 200 mv v id = 5mv pp t offl /los release time (3) 0.5 0.5 0.1 0.5 0.5 s minimum input t onl /los assert time (3) 0.5 0.5 0.2 0.5 0.5 s t offh /los release time (4) 0.5 0.5 0.1 0.5 0.5 s maximum input v sr /los sensitivity range 5 50 5 50 5 50 5 50 mv pp hys /los hysteresis 2 8 2 8 2 4.6 8 2 8 db t r , t f output rise/fall time 260 260 170 260 260 ps v id > 100mv pp t rin ,t fn v id < 100mv pp ac electrical characteristics v cc = +3.3v 10% or +5v 10%, r load = 50? to v cc C2v. notes: 1. input referred noise = rms output noise/low frequency gain. 2. input is 622mhz square wave. 3. input is a 200mhz square wave, tr < 300ps, 8mv pp . 4. input is a 200mhz square wave, tr < 300ps, 1.8v pp .
5 sy88913v micrel, inc. m9999-071310 hbwhelp@micrel.com or (408) 955-1690 output termination the sy88913v outputs must be terminated with a 50? load to v cc C2v (or thevenin equivalent). layout and pcb design since the sy88913v is a high-frequency component, performance can largely be determined by board layout and design. a common problem with high-gain amplifers is feedback from the large swing outputs to the input via the power supply. application note figure 2. los lvl circuit notes: los lvl = v cc C1.32 + r1 + r2 5k? figure 1. differential input confguration the sy88913v ground pin should be connected to the circuit board ground. use multiple pcb vias close to the part to connect to ground. avoid long, inductive runs which can degrade performance. r2 1.32 r1 + r2
6 sy88913v micrel, inc. m9999-071310 hbwhelp@micrel.com or (408) 955-1690 performance curve 0 10 20 30 40 50 60 70 80 90 100 0 -0.2 -0.4 -0.6 -0.8 -1.0 -1.2 los lvl = v cc C v (v) los assert and deassert levels vs los lvl 3.3v t a = 25c 1.25gbps pattern 2 7 -1 0 10 20 30 40 50 60 70 80 90 100 0 -0.2 -0.4 -0.6 -0.8 -1.0 -1.2 los lvl = v cc C v (v) los assert and deassert levels vs los lvl 5.0v t a = 25c 1.25gbps pattern 2 7 -1 figure 3. 3.3v los assert and deassert levels vs. los lvl figure 4. 5.0v los assert and deassert levels vs. los lvl
7 sy88913v micrel, inc. m9999-071310 hbwhelp@micrel.com or (408) 955-1690 10 lead msop (k10-1) micrel, inc. 2180 fortune drive san jose, ca 95131 usa t e l + 1 (408) 944-0800 f a x + 1 (408) 474-1000 w e b 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 specifcations at any time without notifcation to the customer. micrel products are not designed or authorized for use as components in 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) support or sustain life, and whose failure to perform can be reasonably expected to result in a signifcant injury to the user. a purchasers use or sale of micrel products for use in life support appliances, devices or systems is at purchasers own risk and purchaser agrees to fully indemnify micrel for any damages resulting from such use or sale. ? 2005 micrel, incorporated.
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