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1 ? fn7425 caution: these devices are sensitive to electrosta tic discharge; follow proper ic handling procedures. 1-888-intersil or 321-724-7143 | intersil (and design) is a registered trademark of intersil americas inc. copyright ? intersil americas inc. 2004. all rights reserved. elantec is a registered trademark of elantec semiconductor, inc. all other trademarks mentioned are the property of their respective owners. preliminary el1517 xdsl differential line driver the el1517 is a dual operational amplifier designed for vdsl and adsl line driving in dmt based solutions. this device features a high drive capability of 250ma while consuming only 7ma of supply current per amplifier and operating from a single 5v to 12v supply. this driver achieves a typical distor tion of -80dbc, at 150khz into a 25 ? load. the el1517 is available in the industry standard 8-pin so as well as the thermally-enhanced 16-pin qfn package. both are specified for operation over the full -40c to +85c temperature range. the 16-pin qfn package option (el1517il) has control pins c 0 and c 1 for controlling the bias and enable/disable of the outputs. these controls allow for lowering the power to fit the performance/power ratio for the application. the el1517 is ideal for adsl, sdsl, hdsl2 and vdsl line driving applications. features ? drives up to 250ma from a +12v supply ?18v p-p differential output drive into 50 ? ?20v p-p differential output drive into 100 ? ? -80dbc typical driver output distortion at full output at 150khz ? -75dbc typical driver out put distortion at 3.75mhz ? -60dbc typical driver ou tput distortion at 8mhz ? -50dbc typical driver ou tput distortion at 16mhz ? low quiescent current of 7ma per amplifier ? 200mhz bandwidth applications ? vdsl line drivers ? adsl full rate cpe line driving ? g.shdsl, hdsl2 line drivers ? homeplug networking drivers ordering information part number package tape & reel pkg. dwg. # el1517is 8-pin so - mdp0027 el1517is-t7 8-pin so 7? mdp0027 el1517is-t13 8-pin so 13? mdp0027 el1517il 16-pin qfn - mdp0046 el1517il-t7 16-pin qfn 7? mdp0046 el1517il-t13 16-pin qfn 13? mdp0046 pinouts el1517 (8-pin so) top view el1517 (16-pin qfn) top view 1 2 3 4 8 7 6 5 - + - + outa ina- ina+ gnd vs outb inb- inb+ 1 2 3 4 12 11 10 9 5 6 7 8 16 15 14 13 nc ina- ina+ gnd nc nc vs- c0 outa nc vs+ outb nc inb- inb+ c1 - + - + power control logic data sheet june 24, 2004
2 absolute maxi mum ratings (t a = 25c) v s + voltage to ground . . . . . . . . . . . . . . . . . . . . . . -0.3v to +13.2v v in + voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . gnd to v s + current into any input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8ma continuous output current . . . . . . . . . . . . . . . . . . . . . . . . . . . 75ma ambient operating temperature range . . . . . . . . . .-40c to +85c storage temperature range . . . . . . . . . . . . . . . . . .-60c to +150c operating junction temperature . . . . . . . . . . . . . . . . . . . . . . +150c power dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . see curves caution: stresses above those listed in ?absolute maximum ratings? may cause permanent damage to the device. this is a stress o nly rating and operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. important note: all parameters having min/max specifications are guaranteed. typical values are for information purposes only. u nless otherwise noted, all tests are at the specified temperature and are pulsed tests, therefore: t j = t c = t a electrical specifications v s = 12v, r f = 750 ? , r l = 100 ? connected to mid supply, t a = 25c, unless otherwise specified. parameter description conditions min typ max unit ac performance bw -3db bandwidth r f = 453 ? , a v = +2 200 mhz a v = +4 150 mhz hd total harmonic distortion, differential f = 200khz, v o = 16v p-p , r l = 50 ? -72 -83 dbc f = 4mhz, v o = 2v p-p , r l = 100 ? -70 dbc f = 8mhz, v o = 2v p-p , r l = 100 ? -60 dbc f = 16mhz, v o = 2v p-p , r l = 100 ? -50 dbc sr slew rate, single-ended v out from -3v to +3v 600 800 1100 v/s dc performance v os offset voltage -25 +25 mv ? v os v os mismatch -3 +3 mv r ol transimpedance v out from -4.5v to +4.5v 0.7 1.4 2.5 m ? input characteristics i b + non-inverting input bias current -5 5 a i b - inverting input bias current -20 5 +20 a ? i b -i b - mismatch -18 0 +18 a e n input noise voltage 6nv hz i n -input noise current 13 pa/ hz output characteristics v out loaded output swing (single ended) v s = 6v, r l = 100 ? to gnd 4.8 5 v v s = 6v, r l = 25 ? to gnd 4.7 v i out output current r l = 0 ? 450 ma supply v s supply voltage single supply 4.5 13 v i s (el1517is only) supply current, maximum setting all outputs at mid supply 11 14.3 18 ma supply (el1517il only) i s + (full power) positive supply current per amplifier all outputs at 0v, c 0 = c 1 = 0v 11 14.3 18 ma i s + (medium power) positive supply current per amplifier all outputs at 0v, c 0 = 5v, c 1 = 0v 7 8.9 11 ma i s + (low power) positive supply current per amplifier all outputs at 0v, c 0 = 0v, c 1 = 5v 3.7 4.5 5.5 ma i s + (power down) positive supply current per amplifier all outputs at 0v, c 0 = c 1 = 5v 0.1 0.5 ma i inh , c 0 or c 1 c 0 , c 1 input current, high c 0 , c 1 = 5v 90 125 160 a i inl , c 0 or c 1 c 0 , c 1 input current, low c 0 , c 1 = 0v -5 +5 a el1517
3 typical performance curves figure 1. differential frequency response with various r f (full power mode) figure 2. differential frequency response with various r f (medium power mode) figure 3. differential frequency response with various r f (low power mode) figure 4. differential frequency response with various r f (full power mode) figure 5. differential frequency response with various r f (medium power mode) figure 6. differential frequency response with various r f (low power mode) r f = 1k ? r f = 750 ? r f = 243 ? r f = 500 ? 22 20 18 16 14 12 10 8 6 4 2 100k 1m 10m 100m 500m frequency (hz) gain (db) v s = 6v, a v = 5 r l = 100 ? diff r f = 1k ? r f = 750 ? r f = 243 ? 22 20 18 16 14 12 10 8 6 4 2 100k 1m 10m 100m 500m frequency (hz) gain (db) v s = 6v, a v = 5 r l = 100 ? diff r f = 500 ? rf = 750 ? rf = 243 ? 22 20 18 16 14 12 10 8 6 4 2 100k 1m 10m 100m 500m frequency (hz) gain (db) vs = 6v, av = 5 rl = 100 ? diff rf = 500 ? rf = 1k ? r f = 1k ? r f = 243 ? r f = 500 ? 28 26 24 22 20 18 16 14 12 10 8 100k 1m 10m 100m 500m frequency (hz) gain (db) v s = 6v, a v = 10 r l = 100 ? diff r f = 750 ? r f = 1k ? r f = 243 ? r f = 500 ? 28 26 24 22 20 18 16 14 12 10 8 100k 1m 10m 100m 500m frequency (hz) gain (db) v s = 6v, a v = 10 r l = 100 ? diff r f = 750 ? r f = 1k ? r f = 243 ? r f = 500 ? 28 26 24 22 20 18 16 14 12 10 8 100k 1m 10m 100m 500m frequency (hz) gain (db) v s = 6v, a v = 10 r l = 100 ? diff r f = 750 ? el1517
4 figure 7. distortion between el1517il vs el1517is at 2mhz figure 8. distortion between el1517il vs el1517is at 3mhz figure 9. distortion between el1517il vs el1517is at 5mhz figure 10. distortion between el1517il vs el1517is at 10mhz figure 11. 2nd and 3rd harmonic distortion vs r load @ 2mhz (el1517il) figure 12. 2nd and 3rd harmonic distortion vs r load @ 3mhz (el1517il) typical performance curves (continued) -85 -80 -75 -70 -65 -60 -55 -50 123456789 v op-p (v) hd (db) el1517il el1517is 3rd hd 2nd hd v s =6v a v =5 r l =50 ? diff r f =750 -80 -75 -70 -65 -60 -55 -50 123456789 v op-p (v) hd (db) el1517il el1517is 3rd hd 2nd hd v s =6v a v =5 r l =50 ? diff r f =750 -75 -65 -60 -55 -50 -45 -40 123456789 v op-p (v) hd (db) el1517il el1517is 3rd hd v s =6v a v =5 r l =50 ? diff r f =750 -70 2nd hd -65 -60 -55 -50 -45 -40 123456789 v op-p (v) hd (db) el1517il el1517is 3rd hd v s =6v a v =5 r l =50 ? diff r f =750 2nd hd -100 -95 -90 -85 -80 -75 -70 50 60 70 80 90 100 110 120 150 r load ( ? ) hd (db) 3rd hd 2nd hd v s =6v a v =5 r f =750 v opp =4v 130 140 -90 -85 -80 -75 -70 -65 -60 50 60 70 80 90 100 110 120 150 r load ( ? ) hd (db) 2nd hd v s =6v a v =5 r f =750 v opp =4v 130 140 3rd hd el1517
5 figure 13. 2nd and 3rd harmonic distortion vs r load @ 5mhz (el1517il) figure 14. 2nd and 3rd harmonic distortion vs r load @ 10mhz (el1517il) figure 15. frequency response with various c l (full power mode) figure 16. frequency response vs various c l (medium power mode) figure 17. frequency response with various c l (low power mode) figure 18. frequency response vs c l at inverting input typical performance curves (continued) -90 -85 -80 -75 -70 -65 -60 50 60 70 80 90 100 110 120 150 r load ( ? ) hd (db) 2nd hd 130 140 3rd hd -55 -50 v s =6v a v =5 r f =750 v opp =4v -80 -75 -70 -65 -60 -55 -50 50 60 70 80 90 100 110 120 150 r load ( ? ) hd (db) 2nd hd 130 140 -45 -40 v s =6v a v =5 r f =750 v opp =4v 3rd hd 24 22 20 18 16 14 12 10 8 6 4 100k 1m 10m 100m 500m frequency (hz) gain (db) v s = 6v, a v = 5 r l = 50 ? r f = 750 ? c l = 47pf c l = 39pf c l = 12pf c l = 0pf 24 22 20 18 16 14 12 10 8 6 4 100k 1m 10m 100m 500m frequency (hz) gain (db) v s = 6v, a v = 5 r l = 50 ? r f = 750 ? c l = 0pf c l = 39pf c l = 47pf c l = 12pf 24 22 20 18 16 14 12 10 8 6 4 100k 1m 10m 100m 500m frequency (hz) gain (db) v s = 6v, a v = 5 r l = 50 ? r f = 750 ? c l = 47pf c l = 37pf c l = 12pf c l = 0pf 24 22 20 18 16 14 12 10 8 6 4 100k 1m 10m 100m 500m frequency (hz) gain (db) v s = 6v, a v = 5 r l = 100 ? diff r f = 500 ? c l = 22pf c l = 15pf c l = 10pf c l = 0pf el1517
6 figure 19. channel separation vs frequency figure 20. psrr vs frequency figure 21. transimpedance (r ol ) vs frequency figure 22. voltage and current noise vs frequency figure 23. output impedance vs frequency figure 24. differential bandwidth vs supply voltage typical performance curves (continued) -10 -30 -50 -70 -90 -110 10k 100k 1m 10m 100m frequency (hz) channel separation (db) a b b a -10 -30 -50 -70 -90 -110 100k 1m 10m 10m 100m frequency (hz) psrr (db) 200m psrr- psrr+ 10m 3m 300k 100k 30k -110 1k 10k 100k 1m 10m frequency (hz) magnitude ( ? ) 100m 10k 3k 1k 200 150 100 50 0 -50 -100 -150 -200 phase () phase gain 1000 1k 10k 100k 1m 10m frequency (hz) voltage/current noise (nv/ hz)(na/ hz) 100 10 0.0001 0.1 1 10 100 en in- in+ 0.001 0.01 10 1 0.1 10k 100k 1m 10m 100m frequency (hz) output impedance ( ? ) v s = 6v, a v = 1 r f = 750 ? 150 130 120 110 100 90 80 70 60 50 3 3.5 4 4.5 55.5 6 bw (mhz) v s (v) a v = 5, r f = 750 ?, r load = 100 ? diff full power mode 3/4 power mode 1/2 power mode el1517
7 figure 25. differential gain figure 26. differential phase figure 27. supply current vs supply voltage figure 28. input bias current vs temperature figure 29. slew rate vs temperature figure 30. offset voltage vs temperature typical performance curves (continued) 0 0.05 0.1 0.15 0.2 0.25 0.3 1234 # of 150 ? loads differential gain (%) full power mode 0.35 0.4 v s =6v 1/2 power mode 3/4 power mode 0.01 0.02 0.03 0.04 0.05 0.06 0.07 1234 # of 150 ? loads differential phase (%) full power mode 0.08 0.09 v s =6v 1/2 power mode 3/4 power mode 0 2 4 6 8 10 12 1246 v s (v) i s (ma) 14 16 35 full power mode 1/2 power mode 3/4 power mode +is -is -5 -4 -3 -2 -1 0 1 0 25 50 75 100 125 150 temperature (c) input bias current (a) ib+ ib- 1.2k 1.3k 1.4k 1.5k 1.6k 1.7k 1.8k -50 -25 0 25 50 75 100 125 150 temperature (c) slew rate (v/s) -1 0 1 2 3 4 5 -50 -25 0 25 50 75 100 125 150 temperature (c) offset voltage (mv) el1517
8 figure 31. transimpedance vs temperature figure 32. output voltage vs temperature figure 33. supply current vs temperature figure 34. differential peaking vs supply voltage figure 35. package power dissipation vs ambient temperature figure 36. package power dissipation vs ambient temperature typical performance curves (continued) 0 0.5 1 1.5 2 2.5 3 -50 -25 0 25 50 75 100 125 150 temperature (c) transimpedance (m ? ) 4.75 4.85 4.9 4.95 5 5.05 5.1 temperature (c) output voltage (v) r load =100 ? 4.8 -50 -25 0 25 50 75 100 125 150 v s =6v 12 13.5 14 14.5 15 15.5 16 temperature (c) supply current (ma) 13 -50 -25 0 25 50 75 100 125 150 12.5 -1 0 1 2 3 2.5 3 3.5 4 4.5 5 5.5 6 v s (v) peaking (db) a v =5 r f =750 ? r l =100 ? diff jedec jesd51-7 high effective thermal conductivity (4-layer) test board 3.5 3 0 ambient temperature (c) power dissipation (w) 0 150 50 100 2 2.5 1 1.5 0.5 125 25 75 85 1.136w 1 1 0 c/ w s o 8 3.125w j a = 4 0 c / w q f n 1 6 jedec jesd51-3 low effective thermal conducti v test board 1.4 0 0.8 power dissipation (w) 0.4 0.2 0.6 1.2 ambient temperature (c) 0 1 25 50 75 100 150 125 85 781mw j a = 1 6 0 c / w s o 8 833mw j a = 1 5 0 c / w q f n 1 6 el1517
9 applications information product description the el1517 is a dual operational amplifier designed for line driving in dmt adsl and vdsl solutions. it is a dual current mode feedback amplifier with low distortion while drawing moderately low supply current. it is built using elantec?s proprietary complimentary bipolar process and is offered in industry standard pinouts. due to the current feedback architecture, the el1517 closed-loop 3db bandwidth is dependent on the value of the feedback resistor. first the desired bandwidth is selected by choosing the feedback resistor, r f , and then the gain is set by picking the gain resistor, r g . the curves at the beginning of the typical performance curves section show the effect of varying both r f and r g . the 3db bandwidth is somewhat dependent on the power supply voltage. power supply bypassing and printed circuit board layout as with any high frequency device, good printed circuit board layout is necessary for optimum performance. ground plane construction is highly recommended. lead lengths should be as short as possible, below ??. the power supply pins must be well bypassed to reduce the risk of oscillation. a 4.7f tantalum capacitor in parallel with a 0.1f ceramic capacitor is adequate for each supply pin. for good ac performance, parasitic capacitances should be kept to a minimum, especially at the inverting input. this implies keeping the ground plane away from this pin. carbon resistors are acceptable, while use of wire-wound resistors should not be used because of their parasitic inductance. similarly, capacitors should be low inductance for best performance. capacitance at the inverting input due to the topology of the current feedback amplifier, stray capacitance at the inverting input will affect the ac and transient performance of the el1517 when operating in the non-inverting configuration. in the inverting gain mode, added capacitance at the inverting input has little effect since this point is at a virtual ground and stray capacitance is therefore not ?seen? by the amplifier. feedback resistor values the el1517 has been designed and specified with r f = 750 ? for a v = +5. this value of feedback resistor yields extremely flat frequency response with little to no peaking out to 200mhz. as is the case with all current feedback amplifiers, wider bandwidth, at the expense of slight peaking, can be obtained by reducing the value of the feedback resistor. inversely, larger values of feedback resistor will cause rolloff to occur at a lower frequency. see the curves in the typical perf ormance curves section which show 3db bandwidth and peaking vs. frequency for various feedback resistors and various supply voltages. bandwidth vs temperature whereas many amplifier's supply current and consequently 3db bandwidth drop off at high temperature, the el1517 was designed to have little supply current variations with temperature. an immediate benefit from this is that the 3db bandwidth does not drop off dr astically with temperature. supply voltage range the el1517 has been designed to operate with supply voltages from 2.5v to 6v. optimum bandwidth, slew rate, and video characteristics are obtained at higher supply voltages. however, at 2.5v supplies, the 3db bandwidth at a v = +5 is a respectable 200mhz. single supply operation if a single supply is desired, values from +5v to +12v can be used as long as the input common mode range is not exceeded. when using a single supply, be sure to either 1) dc bias the inputs at an appropriate common mode voltage and ac couple the signal, or 2) ensure the driving signal is within the common mode range of the el1517. adsl cpe applications the el1517 is designed as a line driver for adsl cpe modems. it is capable of outpu tting 450ma of output current with a typical supply voltage headroom of 1.3v. it can achieve -85dbc of distortion at low 7.1ma of supply current per amplifier. the average line power requirement for the adsl cpe application is 13dbm (20mw) into a 100 ? line. the average line voltage is 1.41v rms . the adsl dmt peak to average ratio (crest factor) of 5.3 imp lies peak voltage of 7.5v into the line. using a differential driv e configuration and transformer coupling with standard back termination, a transformer ratio of 1:2 is selected. the circuit configuration is as shown below. - + - + tx1 1:2 12.5 12.5 750 750 250 ? afe 100 el1517
10 so package outline drawing el1517
11 all intersil u.s. products are manufactured, asse mbled and tested utilizing iso9000 quality systems. intersil corporation?s quality certifications ca n be viewed at www.intersil.com/design/quality intersil products are sold by description only. intersil corpor ation reserves the right to make changes in circuit design, soft ware and/or specifications at any time without notice. accordingly, the reader is cautioned to verify that data sheets are current before placing orders. information furnishe d by intersil is believed to be accurate and reliable. however, no responsibility is assumed by intersil or its subsidiaries for its use; nor for any infringements of paten ts or other rights of third parties which may result from its use. no license is granted by implication or otherwise under any patent or patent rights of intersil or its subsidiari es. for information regarding intersil corporation and its products, see www.intersil.com qfn package outline drawing note: the package drawing shown here may not be the latest version. to check the latest revision, please refer to the intersil website at el1517

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