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features n 9.4v pp output drive into r l = 25 n using both amplifers, 18.8v pp differential output drive into r l = 25 n 200ma @ v o = 9.4v pp n 0.009%/0.06? differential gain/ phase error n 250mhz -3db bandwidth at g = 2 n 510mhz -3db bandwidth at g = 1 n 210v/s slew rate n 4.5nv/ hz input voltage noise n 2.7pa/ hz input current noise n 7ma supply current n fully specifed at 5v and 12v supplies applications n adsl pci modem cards n adsl external modems n cable drivers n video line driver n twisted pair driver/receiver n power line communications general description the comlinear clc2000 and clc4000 are dual and quad voltage feedback amplifers that offer 200ma of output current at 9.4v pp . the clc2000 and clc4000 are capable of driving signals to within 1v of the power rails. when connected as a differential line driver, the amplifer drives signals up to 18.8vpp into a 25 load, which supports the peak upstream power levels for upstream full-rate adsl cpe applications. the comlinear clc2000 and clc4000 can operate from single or dual sup - plies from 5v to 12v. it consumes only 7ma of supply current per chan - nel. the combination of wide bandwidth, low noise, low distortion, and high output current capability makes the clc2000 and clc4000 ideally suited for customer premise adsl or video line driving applications. typical application - adsl application ordering information part number package pb-free operating temperature range packaging method CLC2000ISO8x soic-8 yes -40c to +85c reel CLC2000ISO8 soic-8 yes -40c to +85c rail clc4000iso14x soic-14 yes -40c to +85c reel clc4000iso14 soic-14 yes -40c to +85c rail moisture sensitivity level for all parts is msl-1. + v in v o+ 1:2 v o- r o+ =12.5 r l =100 r o- =12.5 1/2 clc2000 1/2 clc2000 r g r f+ - r f- v out -vs +vs data sheet c omlinear clc2000, clc4000 high output current dual and quad amplifers rev 1d c omlinear ? clc2000, clc4000 high output current dual and quad amplifers exar corporation www.exar.com 48720 kato road, fremont ca 94538, usa tel. +1 510 668-7000 - fax. +1 510 668-7001
?2007-2013 exar corporation 2/18 rev 1d clc2000 pin assignments pin no. pin name description 1 out1 output, channel 1 2 -in1 negative input, channel 1 3 +in1 positive input, channel 1 4 -v s negative supply 5 +in2 positive input, channel 2 6 -in2 negative input, channel 2 7 out2 output, channel 2 8 +v s positive supply clc2000 pin confguration 2 3 4 5 6 7 8 out2 +in1 -in2 +in2 1 -in1 out1 -v s +v s clc4000 pin assignments pin no. pin name description 1 out1 output, channel 1 2 -in1 negative input, channel 1 3 +in1 positive input, channel 1 4 +v s positive supply 5 +in2 positive input, channel 2 6 -in2 negative input, channel 2 7 out2 output, channel 2 8 out3 output, channel 3 9 -in3 negative input, channel 3 10 +in3 positive input, channel 3 11 -v s negative supply 12 +in4 positive input, channel 4 13 -in4 negative input, channel 4 14 out4 output, channel 4 clc4000 pin confguration 2 3 4 11 12 13 14 -in4 +in1 out4 +in4 1 -in1 out1 5 6 7 out2 -in2 +in2 8 9 10 +in3 -in3 out3 +vs -vs data sheet c omlinear clc2000, clc4000 high output current dual and quad amplifers rev 1d
?2007-2013 exar corporation 3/18 rev 1d absolute maximum ratings the safety of the device is not guaranteed when it is operated above the absolute maximum ratings. the device should not be operated at these absolute limits. adhere to the recommended operating conditions for proper device function. the information contained in the electrical characteristics tables and typical performance plots refect the operating conditions noted on the tables and plots. parameter min max unit supply voltage 0 7 or 14 v input voltage range -v s -0.5v +v s +0.5v v reliability information parameter min typ max unit junction temperature 150 c storage temperature range -65 150 c lead temperature (soldering, 10s) 260 c package thermal resistance 8-lead soic 100 c/w 14-lead soic 88 c/w notes: package thermal resistance ( q ja ), jdec standard, multi-layer test boards, still air. esd protection product human body model (hbm) 2.5kv charged device model (cdm) 2kv recommended operating conditions parameter min typ max unit operating temperature range -40 +85 c supply voltage range 2.5 6.5 v data sheet c omlinear clc2000, clc4000 high output current dual and quad amplifers rev 1d
?2007-2013 exar corporation 4/18 rev 1d electrical characteristics t a = 25c, v s = 5v, r f = r g = 510, r l = 100 to v s /2, g = 2; unless otherwise noted. symbol parameter conditions min typ max units frequency domain response ugbw -3db bandwidth g = +1, v out = 0.2v pp, r f = 0 422 mhz bw ss -3db bandwidth g = +2, v out = 0.2v pp 236 mhz bw ls large signal bandwidth g = +2, v out = 2v pp 68 mhz bw 0.1db 0.1db gain flatness g = +2, v out = 0.2v pp 77 mhz time domain response t r , t f rise and fall time v out = 1v step; (10% to 90%) 3.7 ns t s settling time to 0.1% v out = 2v step 20 ns os overshoot v out = 0.2v step 6 % sr slew rate v out = 2v step 200 v/s distortion/noise response hd2 2nd harmonic distortion 2v pp , 100khz, r l = 25 -83 dbc 2v pp , 1mhz, r l = 100 -85 dbc hd3 3rd harmonic distortion 2v pp , 100khz, r l = 25 -86 dbc 2v pp , 1mhz, r l = 100 -82 dbc d g differential gain ntsc (3.58mhz), dc-coupled, r l = 150 0.01 % d p differential phase ntsc (3.58mhz), dc-coupled, r l = 150 0.05 e n input voltage noise > 1mhz 4.2 nv/hz i n input current noise > 1mhz 2.7 pa/hz x talk crosstalk channel-to-channel 5mhz -63 db dc performance v io input offset voltage 0.3 mv dv io average drift 0.383 v/c i io input offset current 0.2 a i b input bias current 10 a di bni average drift 2.5 na/c psrr power supply rejection ratio dc 81 db a ol open-loop gain r l = 25 76 db i s supply current per channel 6.75 ma input characteristics r in input resistance non-inverting 2.5 m c in input capacitance 1 pf cmir common mode input range 0.4 to 4.6 v cmrr common mode rejection ratio dc 80 db output characteristics r o output resistance closed loop, dc 0.01 v out output voltage swing r l = 25 0.95 to 4.05 v r l = 1k 0.75 to 4.25 v i sc short-circuit output current v out = v s / 2 1000 ma data sheet c omlinear clc2000, clc4000 high output current dual and quad amplifers rev 1d
?2007-2013 exar corporation 5/18 rev 1d electrical characteristics t a = 25c, v s = 12v, r f = r g = 510, r l = 100 to v s /2, g = 2; unless otherwise noted. symbol parameter conditions min typ max units frequency domain response ugbw -3db bandwidth g = +1, v out = 0.2v pp, r f = 0 510 mhz bw ss -3db bandwidth g = +2, v out = 0.2v pp 250 mhz bw ls large signal bandwidth g = +2, v out = 4v pp 35 mhz bw 0.1db 0.1db gain flatness g = +2, v out = 0.2v pp 32 mhz time domain response t r , t f rise and fall time v out = 4v step; (10% to 90%) 13.3 ns t s settling time to 0.1% v out = 2v step 20 ns os overshoot v out = 0.2v step 2 % sr slew rate v out = 4v step 210 v/s distortion/noise response hd2 2nd harmonic distortion 2v pp , 100khz, r l = 25 -84 dbc 2v pp , 1mhz, r l = 100 -86 dbc 8.4v pp , 100khz, r l = 25 -63 dbc 8.4v pp , 1mhz, r l = 100 -82 dbc hd3 3rd harmonic distortion 2v pp , 100khz, r l = 25 -88 dbc 2v pp , 1mhz, r l = 100 -80 dbc 8.4v pp , 100khz, r l = 25 -63 dbc 8.4v pp , 1mhz, r l = 100 -83 dbc d g differential gain ntsc (3.58mhz), dc-coupled, r l = 150 0.009 % d p differential phase ntsc (3.58mhz), dc-coupled, r l = 150 0.06 e n input voltage noise > 1mhz 4.5 nv/hz i n input current noise > 1mhz 2.7 pa/hz x talk crosstalk channel-to-channel 5mhz -62 db dc performance v io input offset voltage (1) -6 0.3 6 mv dv io average drift 0.383 v/c i io input offset current (1) -2 0.2 2 a i b input bias current (1) 10 20 a di bni average drift 2.5 na/c psrr power supply rejection ratio (1) dc 73 81 db a ol open-loop gain r l = 25 76 db i s supply current (1) per channel 7 12 ma input characteristics r in input resistance non-inverting 2.5 m c in input capacitance 1 pf cmir common mode input range 0.6 to 11.4 v cmrr common mode rejection ratio (1) dc 70 79 db output characteristics r o output resistance closed loop, dc 0.01 v out output voltage swing r l = 25 (1) 1.5 1.2 to 10.8 10.5 v r l = 1k 0.8 to 11.2 v i sc short-circuit output current v out = v s / 2 1000 ma notes: 1. 100% tested at 25c data sheet c omlinear clc2000, clc4000 high output current dual and quad amplifers rev 1d
?2007-2013 exar corporation 6/18 rev 1d typical performance characteristics t a = 25c, v s = 12v, r f = 510, r l = 100 to v s /2, g = 2; unless otherwise noted. frequency response vs. r l frequency vs. r l (v s = 5v) inverting frequency response inverting frequency response (v s =5v) non-inverting frequency response non-inverting frequency response (v s =5v) - 7 - 6 - 5 - 4 - 3 - 2 - 1 0 1 0.1 1 10 100 1000 normalized gain (db) frequency (mhz) g = 1 r f = 0 g = 2 g = 5 g = 10 v out = 0.2v pp - 6 - 5 - 4 - 3 - 2 - 1 0 1 2 0.1 1 10 100 1000 normalized gain (db) frequency (mhz) g = 1 r f = 0 g = 2 g = 5 g = 10 v out = 0.2v pp - 7 - 6 - 5 - 4 - 3 - 2 - 1 0 1 0.1 1 10 100 1000 normalized gain (db) frequency (mhz) g = - 1 g = - 2 g = - 5 g = - 10 v out = 0.2v pp - 7 - 6 - 5 - 4 - 3 - 2 - 1 0 1 0.1 1 10 100 1000 normalized gain (db) frequency (mhz) g = - 1 g = - 2 g = - 5 g = - 10 v out = 0.2v pp - 6 - 5 - 4 - 3 - 2 - 1 0 1 2 0.1 1 10 100 1000 normalized gain (db) frequency (mhz) r l = 5k v out = 0.2v pp r l = 1k r l = 150 r l = 50 r l = 25 - 6 - 5 - 4 - 3 - 2 - 1 0 1 2 0.1 1 10 100 1000 normalized gain (db) frequency (mhz) r l = 5k v out = 0.2v pp r l = 1k r l = 150 r l = 50 r l = 25 data sheet c omlinear clc2000, clc4000 high output current dual and quad amplifers rev 1d
?2007-2013 exar corporation 7/18 rev 1d typical performance characteristics - continued t a = 25c, v s = 12v, r f = 510, r l = 100 to v s /2, g = 2; unless otherwise noted. frequency response vs. v out frequency response vs. v out (v s = 5v) recommended r s vs. c l recommended r s vs. c l (v s = 5v) frequency vs. c l frequency vs. c l (v s = 5v) - 7 - 6 - 5 - 4 - 3 - 2 - 1 0 1 0.1 1 10 100 1000 normalized gain (db) frequency (mhz) c l = 1000pf r s = 5 c l = 500pf r s = 6 c l = 100pf r s = 13 c l = 50pf r s = 20 c l = 10pf r s = 30 v out = 0.2v pp - 7 - 6 - 5 - 4 - 3 - 2 - 1 0 1 0.1 1 10 100 1000 normalized gain (db) frequency (mhz) c l = 1000pf r s = 5 c l = 500pf r s = 6 c l = 100pf r s = 13 c l = 50pf r s = 25 c l = 10pf r s = 45 v out = 0.2v pp 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 10 100 1000 r s ( ) c l (pf) v out = 0.2v pp r s optimized for <1db peaking 0 5 10 15 20 25 30 35 40 45 10 100 1000 r s ( ) c l (pf) v out = 0.2v pp r s optimized for <1db peaking - 7 - 6 - 5 - 4 - 3 - 2 - 1 0 1 0.1 1 10 100 1000 normalized gain (db) frequency (mhz) v out = 1v pp v out = 2v pp v out = 4v pp v out = 5v pp - 7 - 6 - 5 - 4 - 3 - 2 - 1 0 1 0.1 1 10 100 1000 normalized gain (db) frequency (mhz) v out = 1v pp v out = 2v pp v out = 3v pp data sheet c omlinear clc2000, clc4000 high output current dual and quad amplifers rev 1d
?2007-2013 exar corporation 8/18 rev 1d typical performance characteristics - continued t a = 25c, v s = 12v, r f = 510, r l = 100 to v s /2, g = 2; unless otherwise noted. open loop transimpendance gain/phase vs. frequency input voltage noise -3db bandwidth vs. output voltage -3db bandwidth vs. output voltage (v s =5v) frequency response vs. temperature frequency vs. temperature (v s = 5v) - 7 - 6 - 5 - 4 - 3 - 2 - 1 0 1 0.1 1 10 100 1000 normalized gain (db) frequency (mhz) v out = 0.2v pp + 85degc - 40degc + 25degc v out = 2v pp - 7 - 6 - 5 - 4 - 3 - 2 - 1 0 1 0.1 1 10 100 1000 normalized gain (db) frequency (mhz) + 85degc - 40degc + 25degc v out = 0.2v pp + 85degc - 40degc + 25degc v out = .2v pp 0 25 50 75 100 125 150 175 200 225 250 275 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 - 3db bandwidth (mhz) v out (v pp ) 0 25 50 75 100 125 150 175 200 225 250 0.0 0.5 1.0 1.5 2.0 2.5 3.0 - 3db bandwidth (mhz) v out (v pp ) open loop gain (db) frequency (hz) 1k 10k 100k 1m 10m 100m 1g -20 80 70 60 gain 40 20 0 50 30 10 -10 open loop phase (deg) -200 0 -20 -40 -80 -120 -160 -60 -100 -140 -180 phase input voltage noise (nv/hz) frequency (mhz) 0.0001 0.001 0.01 0.1 1 10 100 0 50 40 30 20 10 data sheet c omlinear clc2000, clc4000 high output current dual and quad amplifers rev 1d
?2007-2013 exar corporation 9/18 rev 1d typical performance characteristics - continued t a = 25c, v s = 12v, r f = 510, r l = 100 to v s /2, g = 2; unless otherwise noted. differential gain & phase ac coupled differential gain & phase dc coupled 2nd harmonic distortion vs. v out 3rd harmonic distortion vs. v out 2nd harmonic distortion vs. r l 3rd harmonic distortion vs. r l - 100 - 90 - 80 - 70 - 60 - 50 - 40 - 30 - 20 0 5 10 15 20 distortion (dbc) frequency (mhz) r l = 100 v out = 2v pp r l = 1k r l = 25 - 100 - 90 - 80 - 70 - 60 - 50 - 40 - 30 - 20 0 5 10 15 20 distortion (dbc) frequency (mhz) r l = 100 v out = 2v pp r l = 1k r l = 25 - 100 - 90 - 80 - 70 - 60 - 50 - 40 - 30 - 20 0.5 0.75 1 1.25 1.5 1.75 2 2.25 2.5 2.75 3 distortion (dbc) output amplitude (v pp ) 10mhz 5mhz 1mhz - 100 - 90 - 80 - 70 - 60 - 50 - 40 - 30 - 20 0.5 0.75 1 1.25 1.5 1.75 2 2.25 2.5 2.75 3 distortion (dbc) output amplitude (v pp ) 10mhz 5mhz 1mhz - 0.01 - 0.0075 - 0.005 - 0.0025 0 0.0025 0.005 0.0075 0.01 - 0.7 - 0.5 - 0.3 - 0.1 0.1 0.3 0.5 0.7 diff gain (%) and diff phase ( ) input voltage (v) dg r l = 150 ac coupled into 220f dp - 0.03 - 0.02 - 0.01 0 0.01 0.02 0.03 0.04 0.05 0.06 - 0.7 - 0.5 - 0.3 - 0.1 0.1 0.3 0.5 0.7 diff gain (%) and diff phase ( ) input voltage (v) v out = 2v pp dg r l = 150 dc coupled dp data sheet c omlinear clc2000, clc4000 high output current dual and quad amplifers rev 1d
?2007-2013 exar corporation 10/18 rev 1d typical performance characteristics - continued t a = 25c, v s = 12v, r f = 510, r l = 100 to v s /2, g = 2; unless otherwise noted. differential gain & phase ac coupled (v s =5v) differential gain & phase dc coupled (v s =5v) 2nd harmonic distortion vs. v out (v s =5v) 3rd harmonic distortion vs. v out (v s =5v) 2nd harmonic distortion vs. r l (v s =5v) 3rd harmonic distortion vs. r l (v s =5v) - 100 - 90 - 80 - 70 - 60 - 50 - 40 - 30 - 20 0 5 10 15 20 distortion (dbc) frequency (mhz) r l = 25 v out = 2v pp r l = 1k r l = 100 - 100 - 90 - 80 - 70 - 60 - 50 - 40 - 30 - 20 0 5 10 15 20 distortion (dbc) frequency (mhz) r l = 25 v out = 2v pp r l = 1k r l = 100 - 90 - 85 - 80 - 75 - 70 - 65 - 60 - 55 - 50 - 45 0.5 0.75 1 1.25 1.5 1.75 2 2.25 2.5 2.75 3 distortion (dbc) output amplitude (v pp ) 10mhz 5mhz 1mhz - 90 - 85 - 80 - 75 - 70 - 65 - 60 - 55 - 50 - 45 0.5 0.75 1 1.25 1.5 1.75 2 2.25 2.5 2.75 3 distortion (dbc) output amplitude (v pp ) 10mhz 5mhz 1mhz - 0.01 - 0.0075 - 0.005 - 0.0025 0 0.0025 0.005 0.0075 0.01 - 0.4 - 0.3 - 0.2 - 0.1 0 0.1 0.2 0.3 0.4 diff gain (%) and diff phase ( ) input voltage (v) dg r l = 150 ac coupled into 220 f dp - 0.02 - 0.01 0 0.01 0.02 0.03 0.04 - 0.4 - 0.2 0 0.2 0.4 diff gain (%) and diff phase ( ) input voltage (v) dg r l = 150 dc coupled dp data sheet c omlinear clc2000, clc4000 high output current dual and quad amplifers rev 1d
?2007-2013 exar corporation 11/18 rev 1d typical performance characteristics - continued t a = 25c, v s = 12v, r f = 510, r l = 100 to v s /2, g = 2; unless otherwise noted. crosstalk vs. frequency crosstalk vs. frequency (v s =5v) small signal pulse response (v s =5v) large signal pulse response (v s =5v) small signal pulse response large signal pulse response 5.85 5.9 5.95 6 6.05 6.1 6.15 0 20 40 60 80 100 120 140 160 180 200 voltage (v) time (ns) 3.0 4.0 5.0 6.0 7.0 8.0 9.0 0 20 40 60 80 100 120 140 160 180 200 voltage (v) time (ns) v out = 4v pp v out = 2v pp 2.35 2.40 2.45 2.50 2.55 2.60 2.65 0 20 40 60 80 100 120 140 160 180 200 voltage (v) time (ns) 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 0 20 40 60 80 100 120 140 160 180 200 voltage (v) time (ns) v out = 3v pp v out = 2v pp - 90 - 85 - 80 - 75 - 70 - 65 - 60 - 55 - 50 - 45 - 40 - 35 - 30 0.1 1 10 100 crosstalk (db) frequency (mhz) v out = 2v pp - 90 - 85 - 80 - 75 - 70 - 65 - 60 - 55 - 50 - 45 - 40 - 35 - 30 0.1 1 10 100 crosstalk (db) frequency (mhz) v out = 2v pp data sheet c omlinear clc2000, clc4000 high output current dual and quad amplifers rev 1d
?2007-2013 exar corporation 12/18 rev 1d typical performance characteristics - continued t a = 25c, v s = 12v, r f = 510, r l = 100 to v s /2, g = 2; unless otherwise noted. psrr vs. frequency input voltage vs. output current closed loop output impedance vs. frequency cmrr vs. frequency output impedance () frequency (hz) 1k 10k 100k 1m 10m 100m 0.001 10 1 0.1 0.01 cmrr (db) frequency (hz) 10 100 1k 10k 100k 1m 10m 100m -90 -10 -20 -30 -40 -50 -60 -70 -80 psrr (db) frequency (hz) -100 -30 -40 -50 -60 -70 -80 -90 10 100 1k 10k 100k 1m 10m 100m - 1.25 - 1.00 - 0.75 - 0.50 - 0.25 0.00 0.25 0.50 0.75 1.00 1.25 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 i out (a) v in ( v) i out+ r l = 2.668 ? g = - 1 v s = 6v i out - data sheet c omlinear clc2000, clc4000 high output current dual and quad amplifers rev 1d
?2007-2013 exar corporation 13/18 rev 1d application information basic operation figures 1 and 2 illustrate typical circuit confgurations for non-inverting, inverting, and unity gain topologies for dual supply applications. they show the recommended bypass capacitor values and overall closed loop gain equations. + - r f 0.1f 6.8f output g = 1 + ( r f /r g ) input +v s -v s r g 0.1f 6.8f r l figure 1. typical non-inverting gain circuit figure 2. typical inverting gain circuit power supply and decoupling the clc2000 and clc4000 can be powered with a low noise supply anywhere in the range from +5v to +13v. ensure adequate metal connections to power pins in the pc board layout with careful attention paid to decoupling the power supply. high quality capacitors with low equivalent series resis - tance (esr) such as multilayer ceramic capacitors (mlcc) should be used to minimize supply voltage ripple and power dissipation. two decoupling capacitors should be placed on each pow - er pin with connection to a local pc board ground plane. a large, usually tantalum, 10f to 47f capacitor is required to provide good decoupling for lower frequency signals and to provide current for fast, large signal changes at the clc2000/clc4000 outputs. it should be within 0.25 of the pin. a secondary smaller 0.1f mlcc capacitor should located within 0.125 to reject higher frequency noise on the power line. power dissipation power dissipation is an important consideration in applica - tions with low impedance dc, coupled loads. guidelines listed below can be used to verify that the particular ap - plication will not cause the device to operate beyond its intended operating range. calculations below relate to a single amplifer. for the clc2000/clc4000, all amplifers power contribution needs to be added for the total power dissipation. maximum power levels are set by the absolute maximum junction rating of 150c. to calculate the junction tem - perature, the package thermal resistance value theta ja (? ja ) is used along with the total die power dissipation. t junction = t ambient + (? ja p d ) where t ambient is the temperature of the working environ - ment. in order to determine p d , the power dissipated in the load needs to be subtracted from the total power delivered by the supplies. p d = p supply - p load supply power is calculated by the standard power equa - tion. p supply = v supply i (rms supply) v supply = v (s+) - v (s-) power delivered to a purely resistive load is: p load = ((v load ) rms 2 ) / rload eff the effective load resistor will need to include the effect of the feedback network. for instance, rload eff in fgure 1 would be calculated as: r l || (r f + r g ) + - r f 0.1f 6.8f output g = - ( r f /r g ) for optimum input offset voltage set r 1 = r f || r g input +v s -v s 0.1f 6.8f r l r g r 1 data sheet c omlinear clc2000, clc4000 high output current dual and quad amplifers rev 1d
?2007-2013 exar corporation 14/18 rev 1d these measurements are basic and are relatively easy to perform with standard lab equipment. for design purposes however, prior knowledge of actual signal levels and load impedance is needed to determine the dissipated power. here, p d can be found from p d = p quiescent + p dynamic - p load quiescent power can be derived from the specifed i s val - ues along with known supply voltage, v supply . load power can be calculated as above with the desired signal ampli - tudes using: (v load ) rms = v peak / 2 ( i load ) rms = (v load ) rms / rload eff the dynamic power is focused primarily within the output stage driving the load. this value can be calculated as: p dynamic = (v s+ - v load ) rms (i load ) rms assuming the load is referenced in the middle of the pow - er rails or v supply /2. figure 3 shows the maximum safe power dissipation in the package vs. the ambient temperature for the 8 lead soic packages. 0 0.5 1 1.5 2 2.5 - 40 - 20 0 20 40 60 80 maximum power dissipation (w) ambient temperature ( c) soic - 14 soic - 8 figure 3. maximum power derating better thermal ratings can be achieed by maximizing pc board metallization at the package pins. however, be careful of stray capacitance on the input pins. in addition, increased airfow across the package can also help to reduce the effective ? ja of the package. in the event of a short circuit condition, the clc2000/ clc4000 has circuitry to limit output drive capability to 1000ma. this will only protect against a momentary event. extended duration under these conditions will cause junction temperatures to exceed 150c. due to internal metallization constraints, continuous output cur - rent should be limited to 100ma. driving capacitive loads increased phase delay at the output due to capacitive load - ing can cause ringing, peaking in the frequency response, and possible unstable behavior. use a series resistance, r s , between the amplifer and the load to help improve stability and settling performance. refer to figure 4. + - r f input output r g r s c l r l figure 4. addition of r s for driving capacitive loads table 1 provides the recommended r s for various capaci - tive loads. the recommended r s values result in <=1db peaking in the frequency response. the frequency re - sponse vs. c l plots, on page 7, illustrates the response of the clc2000. c l (pf) r s () -3db bw (mhz) 10 40 275 20 24.5 250 50 20 175 100 13.5 135 500 6 75 1000 5 45 table 1: recommended r s vs. c l for a given load capacitance, adjust r s to optimize the tradeoff between settling time and bandwidth. in general, reducing r s will increase bandwidth at the expense of ad - ditional overshoot and ringing. data sheet c omlinear clc2000, clc4000 high output current dual and quad amplifers rev 1d
?2007-2013 exar corporation 15/18 rev 1d overdrive recovery an overdrive condition is defned as the point when ei - ther one of the inputs or the output exceed their specifed voltage range. overdrive recovery is the time needed for the amplifer to return to its normal or linear operating point. the recovery time varies, based on whether the in - put or output is overdriven and by how much the range is exceeded. the clc2000/clc4000 will typically recover in less than 40ns from an overdrive condition. figure 5 shows the clc2000 in an overdriven condition. figure 5. overdrive recovery using the clc2000/clc4000 as a differential line driver the combination of good large signal bandwidth and high output drive capability makes the clc2000/clc4000 well suited for low impedance line driver applications, such as the upstream data path for a adsl cpe modem. the dual channel confguration of the clc2000 provides bet - ter channel matching than a typical single channel device, resulting in better overall performance in differential ap - plications. when confgured as a differential amplifer as in fgure 6, it can easily deliver the 13dbm to a standard 100? twisted-pair cat3 or cat5 cable telephone network, as required in a adsl cpe application. differential circuits have several advantages over single- ended confgurations. these include better rejection of common mode signals and improvement of power-supply rejection. the use of differential signaling also improves overall dynamic performance. total harmonic distortion (thd) is reduced by the suppression of even signal har - monics and the larger signal swings allow for an improved signal to noise ratio (snr). + v in v o+ 1:2 v o- r o+ =12.5 r l =100 r o- =12.5 1/2 clc2000 1/2 clc2000 r g r f+ - r f- v out -vs +vs figure 6: typical differential transmission line driver for any transmission requirement, the fundamental de - sign parameters needed are the effective impedance of the transmission line, the power required at the load, and knowledge concerning the content of the transmitted sig - nal. the basic design of such a circuit is briefy outlined below, using the adsl parameters as a guideline. data transmission techniques, such as adsl, utilize ampli - tude modulation techniques which are sensitive to output clipping. a signals peak to rms ratio, or crest factor (cf), can be used to determine the adequate peak signal levels to insure fdelity for a given signal. for an adsl system, the signal consists of 256 indepen - dent frequencies with varying amplitudes. this results in a noise-like signal with a crest factor of about 5.3. if the driver does not have enough swing to handle the signal peaks, clipping will occur and amplitude modulated infor - mation can be corrupted, causing degradation in the sig - nals bit error rate. to determine the required swing, frst use the specifed load impedance to convert the rms power to an rms volt - age. then, multiply the rms voltage by the crest factor to get the peak values. for example 13dbm, as referenced to 1mw, is ~20mw. 20mw into the 100 cat5 impedance yields a rms voltage of 1.413 vrms . using the adsl crest factor of 5.3 yields ~ 7.5v peak signals. - 6 - 4 - 2 0 2 4 6 - 3 - 2 - 1 0 1 2 3 0 20 40 60 80 100 120 140 160 180 200 output voltage (v) input voltage (v) time (ns) output input v in = 2.5v pp g = 5 data sheet c omlinear clc2000, clc4000 high output current dual and quad amplifers rev 1d
?2007-2013 exar corporation 16/18 rev 1d line coupling through a 1:2 transformer is used to realize these levels. standard back termination is used to match the characteristic 100 impedance of the cat5 cable. for proper power transfer, this requires an effective 1:4 im - pedance match of 25 at the inputs of the transformer. to account for the voltage drop of the impedance matching resistors, the signal levels at the output of the amplifer need to be doubled. thus each amplifer will swing 3.75v about a centered common mode output voltage. in general, the clc2000/clc4000 can be used in any ap - plication where an economical and local hardwired con - nection is needed. for example, routing analog or digital video information for a in-cabin entertainment system. networking of a local surveillance system also could be considered. layout considerations general layout and supply bypassing play major roles in high frequency performance. exar has evaluation boards to use as a guide for high frequency layout and as aid in device testing and characterization. follow the steps below as a basis for high frequency layout: ? include 6.8f and 0.1f ceramic capacitors for power supply decoupling ? place the 6.8f capacitor within 0.75 inches of the power pin ? place the 0.1f capacitor within 0.1 inches of the power pin ? remove the ground plane under and around the part, especially near the input and output pins to reduce para - sitic capacitance ? minimize all trace lengths to reduce series inductances refer to the evaluation board layouts below for more in - formation. evaluation board information the following evaluation board is available to aid in the testing and layout of this device: evaluation board # products ceb006 clc2000 ceb018 clc4000 evalutaion board schematics evaluation board schematics and layouts are shown in fig - ures 7-9. these evaluation boards are built for dual- sup - ply operation. follow these steps to use the board in a single-supply application: 1. short -vs to ground. 2. use c3 and c4, if the -v s pin of the amplifer is not directly connected to the ground plane. figure 7. ceb006 schematic figure 8. ceb006 top view data sheet c omlinear clc2000, clc4000 high output current dual and quad amplifers rev 1d
?2007-2013 exar corporation 17/18 rev 1d figure 9. ceb006 bottom view figure 10. ceb018 schematic figure 11. ceb018 top view figure 12. ceb018 bottom view data sheet c omlinear clc2000, clc4000 high output current dual and quad amplifers rev 1d
?2007-2013 exar corporation 18/18 rev 1d mechanical dimensions soic-8 package soic-14 package data sheet c omlinear clc2000, clc4000 high output current dual and quad amplifers rev 1d for further assistance: exar corporation headquarters and sales offces 48720 kato road tel.: +1 (510) 668-7000 fremont, ca 94538 - usa fax: +1 (510) 668-7001 www.exar.com notice exar corporation reserves the right to make changes to the products contained in this publication in order to improve design, performance or reliability. exar corporation assumes no responsibility for the use of any circuits described herein, conveys no license under any patent or other right, and makes no representation that the circuits are free of patent infringement. charts and schedules contained here in are only for illustration purposes and may vary depending upon a users specifc application. while the information in this publication has been carefully checked; no responsibility, however, is assumed for inaccuracies. exar corporation does not recommend the use of any of its products in life support applications where the failure or malfunction of the product can reasonably be expected to cause failure of the life support system or to signifcantly affect its safety or effectiveness. products are not authorized for use in such applications unless exar corporation receives, in writing, assurances to its satisfaction that: (a) the risk of injury or damage has been minimized; (b) the user assumes all such risks; (c) potential liability of exar corporation is adequately protected under the circumstances. reproduction, in part or whole, without the prior written consent of exar corporation is prohibited.

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