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1 single port, vdsl2 differential line driver isl1550 the isl1550 is a dual operational amplifier intended to be used as a differential line dr iver. isl1550?s high bandwidth and low distortion performance enables the support of vdsl2 8b, 17a and 30a modem applications. this device features a high cu rrent drive capability of 750ma required to drive large voltage peaks into heavy loads. in central office (co) applications, the driver achieves a typical missing band power ratio (mbpr) of -66dbc in vdsl2 8b upstream (us) 1 band and mbpr?s of -61dbc and -60dbc in vdsl2 17a us1 and us2 respectively. the isl1550 has two bias current control pins (c0, c1) to allow for four power settings (disable, low, medium, high). the vdsl modem dsp configures the line driver?s power setting based on the desired mode of operation. the line driver operates on a nominal single +12v or a dual 6v supplies with bias current in active mode between 15ma to 32ma, depending on its power setting. the isl1550?s gain setting is configurable at the application level by setting the rf and rg resistor values. the surge current handling of is l1550 has been enhanced to allow itu-t k.20 and gr1089 compliance with minimal external surge protection circuitry. the isl1550 is available in th e thermally-enhanced, pb-free rohs compliant 16 ld qfn package and is specified for operation over the full -40c to +85c temperature range. features ? 20dbm output power capability ? drives up to 750ma from a +12v supply ?18v p-p differential output drive into 20 ? -89dbc typical driver output di stortion at full output at 200khz, 12v p-p differential ? -61dbc us1, -60dbc us2 avg. mbpr 17a ? supply range: 4.0v to 6.6v, +8.0v to +13.2v ?thermal shutdown ? k.20, gr-1089 surge robustness validated applications ? vdsl2 profiles: 8mhz, 17mhz, and 30mhz related literature ? an1325 ?choosing and using bypass capacitors? table 1. alternate solutions part # nominal v cc (v) bandwidth (mhz) applications isl1557 6,+12 200 vdsl2 isl1539a 12,+24 240 vdsl2 figure 1. typical application circuit figure 2. us2 mbpr 17a vdsl2 performance 2.2 750 +6v + - afe 750 + - 1.5k ? isl1550 ? isl1550 2.2 100 nominal line 1:2.5 1k 1k 2.2n -6v 500 500 100n 100n supply decoupling not shown rf rf rg -140 -130 -120 -110 -100 -90 -80 -70 -60 -50 -40 8.40m 8.90m 9.40m 9.90m 10.4m 10.9m 11.4m 11.9m frequency (hz) march 16, 2012 fn6795.0 caution: these devices are sensitive to electrostatic discharge; follow proper ic handling procedures. 1-888-intersil or 1-888-468-3774 | copyright intersil americas inc. 2012. all rights reserved intersil (and design) is a trademark owned by intersil corporation or one of its subsidiaries. all other trademarks mentioned are the property of their respective owners.
isl1550 2 fn6795.0 march 16, 2012 connection diagram pin configuration isl1550 (16 ld qfn) top view figure 3. typical differential amplifier i/o 25 1.5k +6v + - 1.5k + - - 6 v ? isl1550 25 inb- ina- outa outb ina + inb + bias current control c0 c1 + ? isl1550 750 2v p-p 5v p-p into 50 + + + 10v p-p gnd av = (1.5k / (750/2)) + 1 = 5v/v 1 3 4 15 nc ina- ina+ gnd outa nc vs+ outb 16 14 13 2 12 10 9 11 6 578 nc inb- inb+ c1 nc nc vs- c0 v s- * *thermal pad connects to most negative supply
isl1550 3 fn6795.0 march 16, 2012 pin descriptions pin number pin name function 1ncno connect 2 ina- amplifier a inverting input 3 ina+ amplifier a non-inverting input 4gndground 5ncno connect 6ncno connect 7 vs- negative supply voltage 8 c0 digital control pin 9 c1 digital control pin 10 inb+ amplifier b non-inverting input 11 inb- amplifier b inverting input 12 nc no connect 13 outb amplifier b output 14 vs+ positive supply voltage 15 nc no connect 16 outa amplifier a output ordering information part number (notes 2, 3) part marking temp range (c) package (pb-free) pkg. dwg. # isl1550irz 155 0irz -40 to +85 16 ld qfn l16.4x4h isl1550irz-t7 (note 1) 155 0irz -40 to +85 16 ld qfn l16.4x4h isl1550irz-t13 (note 1) 155 0irz -40 to +85 16 ld qfn l16.4x4h ISL1550IRZ-EVALZ evaluation board notes: 1. please refer to tb347 for details on reel specifications. 2. these intersil pb-free plastic packaged products employ spec ial pb-free material sets, molding compounds/die attach materials , and 100% matte tin plate plus anneal (e3 termination finish , which is rohs compliant and compatible wi th both snpb and pb-free soldering opera tions). intersil pb-free products are msl classified at pb-fr ee peak reflow temperatures that meet or exceed the pb-free requirements of ipc/jed ec j std-020. 3. for moisture sensitivity level (msl), please see device information page for isl1550 . for more information on msl please see tech brief tb363 .
isl1550 4 fn6795.0 march 16, 2012 absolute maximum ratings (t a = +25c) thermal information v s + voltage to gnd . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3v to +13.2v driver v in + voltage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .gnd to +v s c 0 , c 1 voltage to gnd . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3v to +v s current into any input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8ma continuous output current for long term re liability. . . . . . . . . . . . . . . . .50ma esd rating human body model (tested per jesd22-a114f). . . . . . . . . . . . . . . . . . 4kv machine model (tested per jesd22-a115c) . . . . . . . . . . . . . . . . . . 300v charge device model (tested per jesd22-c101e). . . . . . . . . . . . . .1.5kv thermal resistance (typical) ja (c/w) jc (c/w) 16 ld qfn package (notes 4, 5) . . . . . . . . 53 16.5 maximum junction temperature (plastic package) . . . . . . . . . . . .+150c storage temperature range. . . . . . . . . . . . . . . . . . . . . . . .-40c to +150c pb-free reflow profile . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . see link below http://www.intersil.com/ pbfree/pb-freereflow.asp operating conditions ambient temperature range . . . . . . . . . . . . . . . . . . . . . . . . -40c to +85c junction temperature range . . . . . . . . . . . . . . . . . . . . . . .-40c to +150c caution: do not operate at or near the maximum ratings listed for extended periods of time. exposure to such conditions may adv ersely impact product reliability and result in failures not covered by warranty. notes: 4. ja is measured in free air with the componen t mounted on a high effective thermal conduc tivity test board with ?direct attach? fe atures. see tech brief tb379. 5. for jc , the ?case temp? location is the center of the exposed metal pad on the package underside. electrical specifications v s = 6v, see figure 1, t a = +25c, unless otherwise specified. parameter description conditions min (note 6) typ max (note 6) unit ac performance bw -3db bandwidth see figure 1 105 mhz thd total harmonic distortion, differential f = 200khz, v o = 12v p-p output , r l = 20 -89 dbc f = 4mhz, v o = 12v p-p output , r l = 100 -67 dbc f = 10mhz, v o = 12v p-p output , r l = 100 -61 dbc sr slew rate (20% to 80%) v out from -6v to +6v (differential) 1500 2400 v/s dc performance v os_cm input offset voltage common mode -45 +45 mv v os_dm input offset voltage differential mode -7.5 +7.5 mv input characteristics i b + non-inverting input bias current -7.0 -3.0 +7.0 a i b - dm inverting input bias current differential mode -45 7 +45 a e o differential output noise see figure 1 [at transformer input] 45 nv hz output characteristics v out loaded output swing (single-ended) v s = 6v, r l diff = 100 4.7 5.0 v v s = 6v, r l diff = 20 4.5 v supply +v s supply voltage single supply (-v s = gnd) 8.0 12 13.2 v i s + (full bias) positive supply current all outputs at 0v, c 0 = c 1 = 0v 27 32 37 ma i s + (medium bias) positive supply current all outputs at 0v, c 0 = 5v, c 1 = 0v 19 23 26 ma i s + (low bias) positive supply current all outputs at 0v, c 0 = 0v, c 1 = 5v 12 15 18 ma i s + (power down) positive supply current all outputs at 0v, c 0 = c 1 = 5v 1.3 1.6 2.5 ma i inh , c 0 or c 1 c 0 , c 1 input current, high c 0 , c 1 = 6v 100 165 224 a i inl , c 0 or c 1 c 0 , c 1 input current, low c 0 , c 1 = 0v -1.5 -1.0 +1.5 a v inh , c 0 or c 1 c 0 , c 1 input voltage, high 2.0 v v inl , c 0 or c 1 c 0 , c 1 input voltage, low 0.8 v note: 6. compliance to datasheet limits is assured by one or more methods: production test, characterization and/or design.
isl1550 5 fn6795.0 march 16, 2012 typical performance curves v cc = 6v, see figure 1, t a = +25c, c0 = c1 = 0v (full power), unless otherwise noted. figure 4. small signal frequency response vs r load figure 5. small signal frequency response vs c load figure 6. small signal bandwidth vs supply voltage figure 7. large signal frequency response figure 8. harmonic dist ortion vs frequency figure 9. 4mhz harmonic dist ortion vs output voltage -12 -9 -6 -3 0 3 6 1m 10m 100m 1g frequency (hz) 50 25 16 normalized gain (db) -12 -9 -6 -3 0 3 6 1m 10m 100m 1g 33pf 22pf 18pf frequency (hz) normalized gain (db) -12 -9 -6 -3 0 3 6 1m 10m 100m 1g v cc = 12v to 8v frequency (hz) normalized gain (db) -12 -9 -6 -3 0 3 6 1m 10m 100m 1g 5v p-p 2v p-p 1v p-p frequency (hz) normalized gain (db) -100 -90 -80 -70 -60 -50 -40 -30 1m 10m 100m frequency (hz) 5v op-p-diff 100 r load harmonic distortion (dbc) thd 3rd hd 2nd hd -90 -85 -80 -75 -70 -65 -60 -55 -50 -45 -40 110 v op-p-load (v) 100 r load harmonic distortion (dbc) thd 3rd hd 2nd hd
isl1550 6 fn6795.0 march 16, 2012 figure 10. 10mhz harmonic distortion vs output voltage figure 11. 20mhz harmonic distortion vs output voltage figure 12. mbpr 8b us1 figure 13. mbpr 17a us2 figure 14. differential output noise typical performance curves v cc = 6v, see figure 1, t a = +25c, c0 = c1 = 0v (full power), unless otherwise noted. (continued) -90 -85 -80 -75 -70 -65 -60 -55 -50 -45 -40 110 100 r load harmonic distortion (dbc) thd 3rd hd 2nd hd v op-p-load (v) -90 -85 -80 -75 -70 -65 -60 -55 -50 -45 -40 110 v op-p-load (v) 100 r load harmonic distortion (dbc) thd 3rd hd 2nd hd -140 -130 -120 -110 -100 -90 -80 -70 -60 -50 -40 -30 -20 3.78m 3.98m 4.18m 4.38m 4.58m 4.78m 4.98m 5.18m frequency (hz) mtpr (dbm) par = 5.32/v 18dbm line power, r l = 25 , avg. mbpr = -66dbc -140 -130 -120 -110 -100 -90 -80 -70 -60 -50 -40 -30 -20 8.48m 8.98m 9.48m 9.98m 10.5m 11m 11.5m frequency (hz) mtpr (dbm) par = 6.3/v 14.5dbm line power, r l = 25 , avg. mbpr = -60dbc 10 100 10k 100k 1m 10m 100m frequency (hz) full power medium power low power nv/ hz fig. 1 at transformer inputs
isl1550 7 fn6795.0 march 16, 2012 typical performance curves v cc = 6v, see figure 1, t a = +25c, c0 = 3.3v, c1 = 0v (medium power), unless otherwise noted. figure 15. small signal frequency response vs r load figure 16. small signal frequency response vs c load figure 17. large signal frequency response figure 18. harmonic distortion vs frequency figure 19. 4mhz harmonic dist ortion vs output voltage figure 20. 10mhz harmonic di stortion vs output voltage -12 -9 -6 -3 0 3 6 1m 10m 100m 1g frequency (hz) 50 25 16 normalized gain (db) -12 -9 -6 -3 0 3 6 1m 10m 100m 1g 33pf 22pf 18pf frequency (hz) normalized gain (db) -12 -9 -6 -3 0 3 6 1m 10m 100m 1g 5v p-p 2v p-p 1v p-p frequency (hz) normalized gain (db) -100 -90 -80 -70 -60 -50 -40 -30 1m 10m 100m frequency (hz) 5v op-p-diff 100 r load harmonic distortion (dbc) thd 3rd hd 2nd hd -90 -85 -80 -75 -70 -65 -60 -55 -50 -45 -40 110 100 r load harmonic distortion (dbc) thd 3rd hd 2nd hd v op-p-load (v) -90 -85 -80 -75 -70 -65 -60 -55 -50 -45 -40 110 100 r load harmonic distortion (dbc) thd 3rd hd 2nd hd v op-p-load (v)
isl1550 8 fn6795.0 march 16, 2012 typical performance curves v cc = 6v, see figure 1, t a = +25c, c0 = 0v, c1 = 3.3v (low power), unless otherwise noted. figure 21. small signal frequency vs r load figure 22. small signal frequency response vs c load figure 23. large signal frequency response figure 24. harmonic distortion vs frequency figure 25. 4mhz harmonic dist ortion vs output voltage figure 26. 10mhz harmonic di stortion vs output voltage -12 -9 -6 -3 0 3 6 1m 10m 100m 1g frequency (hz) 50 25 16 normalized gain (db) -12 -9 -6 -3 0 3 6 1m 10m 100m 1g 33pf 22pf 18pf frequency (hz) normalized gain (db) -12 -9 -6 -3 0 3 6 1m 10m 100m 1g frequency (hz) normalized gain (db) 5v p-p 2v p-p 1v p-p -100 -90 -80 -70 -60 -50 -40 -30 1m 10m 100m frequency (hz) 5v op-p-diff 100 r load harmonic distortion (dbc) thd 3rd hd 2nd hd -90 -85 -80 -75 -70 -65 -60 -55 -50 -45 -40 110 100 r load harmonic distortion (dbc) thd 3rd hd 2nd hd v op-p-load (v) -90 -85 -80 -75 -70 -65 -60 -55 -50 -45 -40 110 100 r load harmonic distortion (dbc) thd 3rd hd 2nd hd v op-p-load (v)
isl1550 9 fn6795.0 march 16, 2012 typical performance curves vcc = 6v, see figure 3, gain = 5v/v (differential), rf = 1.5k , r load = 100 , t a = +25c, c0 and c1 varied, unless otherwise noted. figure 27. off-isolation figure 28. differential output impedance figure 29. power on figure 30. power off figure 31. overdrive recovery figure 32. quiescent current vs temperature -120 -110 -100 -90 -80 -70 -60 -50 -40 -30 100k 1m 10m 100m 1g v s = 6v av = 5 rf = 750 r load = 100 v in = 1v p-p diff frequency (hz) gain (db) 3.5 4.5 5.5 6.5 7.5 8.5 9.5 10.5 11.5 12.5 13.5 100k 1m 10m 100m full power medium power low power v s = 6v rf = 750 r g = 374 r l = 100 diff frequency (hz) differential ( ) t = 0s c0, c1 pin 2v/div output pin 5v/div 300ns output sine wave t = 1.60000s c0, c1 pin 2v/div output pin 5v/div t = 242.800ns output a output b 2v/div 0 5 10 15 20 25 30 35 40 -40-30-20-10 0 1020304050607080 temperature (c) quiescent current (ma) full power(ma) medium power low power figure 1
isl1550 10 fn6795.0 march 16, 2012 figure 33. 200khz distortion vs temperature figure 34. 4mhz distortion vs temperature typical performance curves vcc = 6v, see figure 3, gain = 5v/v (differential), rf = 1.5k , r load = 100 , t a = +25c, c0 and c1 varied, unless otherwise noted. (continued) -100 -98 -96 -94 -92 -90 -88 -86 -84 -82 -80 -40-30-20-10 0 1020304050607080 temperature(c) 12v p-p-d 20 r load hd (dbc) 3rd hd 2nd hd figure 1 -80 -78 -76 -74 -72 -70 -68 -66 -64 -62 -60 -40-30-20-10 0 1020304050607080 temperature(c) hd (dbc) 3rd hd 2nd hd figure 1
isl1550 11 fn6795.0 march 16, 2012 applications information product description the isl1550 is a dual operational amplifier designed for line driving in dmt vdsl2 8mhz, 12mhz, 17mhz and 30mhz bandplans solutions. it is a current mode feedback amplifier with low distortion drawing moderately low supply current. due to the current feedback architecture, the isl1550 closed-l oop 3db bandwidth is dependent on the value of the feedback resist or. first, the desired bandwidth is selected by choosing th e feedback resistor, r f , and then the gain is set by picking the gain resistor, r g (figure 3). vdsl co applications the isl1550 is designed as a vdsl line driver for co. at an output current of 450ma, the ty pical supply voltage headroom is 1.5v on each side of the differential output. the average line power requirement for the vdsl co application is 20dbm (100mw) into a 100 line. the average line voltage is 3.16v rms . the vdsl dmt peak-to-averag e ratio (crest factor) of 5.3 implies peak voltage of 16.8v p into the line. using a differential drive configuration and transformer coupling with standard back termination, a transformer ratio of 1:2.5 is selected. the active termination technique provides better power efficiency by reducing the backmatch resistor by a factor of k = 5. positive feedback resistors, rp, can be sized to make the effective backmatch impedance la rger. the circuit configuration is shown in figure 35. power supply bypassing and printed circuit board layout as with any high frequency device, good printed circuit board layout is necessary for optimu m performance. ground plane construction is highly recommende d. lead lengths should be as short as possible (below 0.25?). 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. during power- up, it is necessary to limit the slew rate of the rising power su pply to less than 1v/s. if the power supply rising time is undetermined, a series 10 resistor on the power supply line before the decoupling caps can be used to ensure the proper power supply rise time. for good ac performance, parasiti c capacitances should be kept to a minimum, especially at the inverting input. this implies keeping the ground plane away from this pin. carbon or metal film resistors are acceptable, wh ile use of wire-wound resistors should be avoided 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 isl1550 when operating in the non-inverting configuration. feedback resistor values the isl1550 has been designed and specified with r f =1.5k for a v = +5 (figure 3). 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 the feedback resistor will cause rolloff to occur at a lower frequency. quiescent current vs temperature the isl1550 was designed to slig htly increase quiescent current with temperature to maintain go od distortion performance at high temperatures. refer to ?typical performance curves? beginning on page 5. supply voltage range the isl1550 has been designed to operate with supply voltages from 4.0v to 6.6v nominal. optimum bandwidth, slew rate, and video characteristics are obtain ed at higher supply voltages. single supply operation if a single supply is desired, values from +8.0v to +13.2v nominal 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 isl1550. - + - + tx1 1:2.5 12.5/k 12.5/k 1.5k afe 100 figure 35. circuit configuration rp rp 750 750 r p = r f (k/(k-1))
isl1550 12 intersil products are manufactured, assembled and tested utilizing iso9000 quality systems as noted in the quality certifications found at www.intersil.com/design/quality intersil products are sold by description only. intersil corporat ion 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 furnished by intersil is believed to be accurate and reliable. however, no responsi bility is assumed by intersil or its subsid iaries for its use; nor for any infringem ents of patents 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 i ntersil or its subsidiaries. for information regarding intersil corporation and its products, see www.intersil.com fn6795.0 march 16, 2012 for additional products, see www.intersil.com/product_tree products intersil corporation is a leader in the design and manufacture of high-performance analog semico nductors. the company's product s address some of the industry's fastest growing markets, such as , flat panel displays, cell phones, handheld products, and noteb ooks. intersil's product families address power management and analog sign al processing functions. go to www.intersil.com/products for a complete list of intersil product families. for a complete listing of applications, rela ted documentation and related parts, please see the respective device information p age on intersil.com: isl1550 to report errors or suggestions for this datasheet, please go to: www.intersil.com/askourstaff revision history the revision history provided is for inform ational purposes only and is believed to be accurate, but not warranted. please go t o web to make sure you have the latest revision. date revision change march 16, 2012 fn6795.0 initial release.
isl1550 13 fn6795.0 march 16, 2012 package outline drawing l16.4x4h 16 lead quad flat no-lead plastic package rev 0, 1/12 located within the zone indicated. the pin #1 identifier may be unless otherwise specified, tolerance : decimal 0.05 tiebar shown (if present) is a non-functional feature. the configuration of the pin #1 id entifier is optional, but must be between 0.15mm and 0.30mm from the terminal tip. dimension applies to the metallized terminal and is measured dimensions in ( ) for reference only. dimensioning and tolerancing conform to asme y14.5m-1994. 6. either a mold or mark feature. 3. 5. 4. 2. dimensions are in millimeters. 1. notes: bottom view detail "x" side view typical recommended land pattern top view see detail "x" 0.30 0.05 base plane pin #1 5 8 ( 3 . 6 typ ) (12x0.65) (16x0.30) 0 . 20 ref +0.03/-0.02 c 5 4 0.10 c m index area (4x) 0.15 pin 1 6 4.00 12 4.00 9 a b 4 0.65 12x 13 4x 1.95 16 1 6 c seating plane 0.10 c ab 16x 0.5500.05 2.40 ( 2.40) 0.900.10 (16x0.75) 2.40 index area

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