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400 mhz to 4000 m hz low noise amplifier data sheet ADL5521 rev. b document feedback information furnished by analog devices is believed to be accurate and reliable. however, no responsibility is assumed by analog devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. spec ifications subject to change without notice. no license is granted by implication or otherwise under any patent or patent rights of analog devices. trademarks and registered trademarks are the property of their respective owners. one technology way, p.o . box 9106, norwood, ma 02062 - 9106, u.s.a. tel: 781.329.4700 ? 2008 C 2013 analog devices, inc. all rights reserved. technical support www.analog.com features operation from 400 mhz to 4000 mhz noise figure of 0.8 db at 900 mhz requires few external components integrated active bias control circuit integrated dc blocking capacitors adjustable bias for low power applications single - supply operation from 3 v to 5 v gain of 20. 8 db at 900 mhz oip3 of 37.0 dbm at 900 mhz p1db of 2 1.8 dbm at 900 mhz small footprint lfcsp pin - compatible version with 21.5 db gain available functional block dia gram 1 vbias 2 rfin 3 nc 4 nc 7 rfout 8 vpos 6 nc 5 nc active bias ADL5521 nc = no connect 06828-001 figure 1. general description the ADL5521 is a high performance gaas phemt low noise amplifier. it provides high gain and l ow noise figure for single - down conversion if sampling receiver archi tectures as well as direct - down conversion receivers. the ADL5521 provides a high level of integration by incorporating the active bias and dc blocking capacitors, making it very easy to use while not sacrificing design flex ibility. the ADL5521 is easy to tune , requiring only a few external components. the device can support operation from 3 v to 5 v, and the current draw can be adjusted with the external bias re sistor for applications requiring low power consumption. the ADL5521 comes in a compact, thermally enhanced, 3 mm 3 mm lfcsp and operates over the temperature range of ?40c to +85 c. a fully populated evaluation board is also available.
ADL5521 data sheet rev. b | page 2 of 24 table of contents features .............................................................................................. 1 functional block diagram .............................................................. 1 general description ......................................................................... 1 revision history ............................................................................... 2 specifications ..................................................................................... 3 ac specifications .......................................................................... 3 dc specifications ......................................................................... 4 de - embedded s - parameters, vpos = 3 v to 5 v, rfin = port 1, vpos = port 2, rfout = port 3 .................................. 4 absolute maximum ratings ............................................................ 5 esd caution .................................................................................. 5 pin configuration and function descriptions ............................. 6 typical performance characteristics ............................................. 7 900 mhz, vpos = 5 v ................................................................. 7 1950 mhz, vpos = 5 v .............................................................. 8 2600 mhz, vpos = 5 v .............................................................. 9 3500 mhz, vpos = 5 v ............................................................ 10 900 mhz, vpos = 3 v .............................................................. 11 1950 mhz, vpos = 3 v ............................................................ 12 2600 mhz, vpos = 3 v ............................................................ 13 3500 mhz, vpos = 3 v ............................................................ 14 dc characteristics ..................................................................... 15 basic connections .......................................................................... 16 evaluation board ............................................................................ 17 soldering information and recommended pcb land pattern .......................................................................................... 17 tuning the ADL5521 for optimal noise figure ........................ 18 tuning s22 ................................................................................... 18 tuning the lna input fo r optimal gain ................................ 19 tuning the lna input for optimal noise figure .................. 19 s11 of the lna with s22 matched ........................................... 20 outline dimensions ....................................................................... 21 ordering guide .......................................................................... 21 revision history 11/13 rev. a to rev. b added figure 52, renumbered sequentially .............................. 15 9/09 rev. 0 to rev. a updated maximum junction temperature unit (table 4) ......... 5 10 /08 revision 0: initial version
data sheet ADL5521 rev. b | page 3 of 24 specifications ac specifications t a = 25 c, r 1 = 1.3 k ?; p arameters include matching circuit, matched for optimal noise, unless otherwise noted . table 1 . 3 v 5 v parameter conditions min typ max min typ max unit frequency = 900 mhz gain (s21) 20.3 20 .8 db vs. frequ ency 50 mhz 0.28 0.33 db vs. temperature ? 40 c t a +85 c 0.53 0.46 db noise figure 1 0.8 0. 9 db output third - order intercept (oip3) f = 1 mhz, p out = 0 dbm per tone 28.0 37. 0 dbm output 1 db compression point (p1db) 17 .8 2 1.8 dbm input return loss (s11) ?8.0 ?9 .0 db output return loss (s22) ?14.7 ?15.3 db isolation (s12) ?23.8 ? 25. 0 db frequency = 1950 mhz gain (s21) 15. 4 14.7 15.8 17.0 db vs. frequency 30 mhz 0.04 0.06 db vs. temp erature ? 40c t a +85c 0.43 0.40 db noise figure 1 1.0 1.0 db output third - order intercept (oip3) f = mhz, p out = 0 dbm per tone 29.0 35.0 dbm output 1 db compression point (p1db) 1 7.6 21.8 dbm input return loss (s11) ? 10. 5 ?12.5 db output return loss (s22) ?25.5 ?25.5 db isolation (s12) ? 20.2 ? 21.0 db frequency = 2600 mhz gain (s21) 12. 4 12. 8 db vs. frequency 100 mhz 0.35 0.35 db vs. temperature ? 40c t a +85c 0.46 0.45 db noise figure 1 0.9 1.0 db output third - order intercept (oip3) f = 1 mhz, p out = 0 dbm per tone 30.5 35.5 dbm output 1 db compression point (p1db) 1 7. 1 21. 5 dbm input retur n lo ss (s11) ? 7.1 ? 7.7 db output return lo ss (s22) ? 14.1 ? 13.5 db isolation (s12) ? 20.0 ? 20.5 db frequency = 3500 mhz gain (s21) 10.0 10. 3 db vs. frequency 100 mhz 0.56 0.59 db vs. temperature ? 40c t a +85c 0.66 0.63 db noise figure 1 1.0 1.1 db output third - order intercept (oip3) f = 1 mhz, p out = 0 dbm per tone 31.0 36.0 dbm output 1 db compression point (p1db) 1 7 .0 2 0 . 9 dbm input return lo ss (s11) ? 18.0 ? 18.3 db output return loss (s22) ? 10.5 ? 11.0 db isolation (s12) ? 17.8 ? 18.1 db 1 noise f igur e de - embedded to first matching component on input side.
ADL5521 data sheet rev. b | page 4 of 24 dc specifications table 2 . parameter conditions 3 v 5 v min typ max min typ max unit supply current 30 60 ma vs. temperature ?40c t a +85c 4 7 ma de - embedded s - parameters, v pos = 3 v to 5 v , rf in = port 1, vpos = port 2, rf out = port 3 table 3 . frequency (ghz) s11 (db /ang ) s12 (db /ang ) s13 (db /ang) s21 (db /ang) s22 (db /a ng) s23 (db /ang) s31 (db /ang) s32 (db /ang) s33 (db /ang) 0.125 ? 3.8/ ? 11.3 ? 34.5/ + 8.9 ? 37.2/ + 51.8 + 21.5/ + 161 ? 11.4/ ? 133 ? 4.4/ + 32 + 18.8/ ? 155 + 4.3/ + 32 ? 4.8/ ? 80.9 0.25 ? 3.8/ ? 24.5 ? 34.4/ + 26.6 ? 35.0/ + 50.5 + 20.2/ + 158 ? 10.4/ ? 153 ? 3.5/ + 19.8 + 19.5/ ? 178 ? 3.4/ + 20.1 ? 8.0/ ? 111 0.375 ? 4.0/ ? 37.1 ? 33.3/ + 39.6 ? 33.3/ + 54.2 + 19.5/ + 154 ? 9.5/ ? 158 ? 3.5/ + 16.5 + 19.4/ + 170 ? 3.4/ + 17.0 ? 9.2/ ? 126 0.5 ? 4.4/ ? 48.9 ? 32.2/ + 48.9 ? 31.9/ + 57.7 + 18.7/ + 150 ? 8.7/ ? 158 ? 3.6/ + 16.2 + 19.0/ + 161 ? 3.5/ + 16.7 ? 9.7/ ? 133 0.625 ? 4.7/ ? 60.0 ? 31.2/ + 55.8 ? 30.7/ + 60.2 + 18.0/ + 146 ? 7.9/ ? 155 ? 3.8/ + 17.2 + 18.5/ + 153 ? 3.7/ + 17.7 ? 9.7/ ? 137 0.75 ? 5.0/ ? 70.2 ? 30.4/ + 61.3 ? 29.7/ + 61.9 + 17.2/ + 143 ? 7.2/ ? 150 ? 4.1/ + 19.1 + 18.0/ + 147 ? 3.9/ + 19.5 ? 9.5/ ? 139 0.875 ? 5.3/ ? 79.1 ? 29.7/ + 66.6 ? 28.9/ + 63.5 + 16.4/ + 141 ? 6.8/ ? 144 ? 4.3/ + 21.6 + 17.3/ + 1 41 ? 4.2/ + 22.1 ? 9.3/ ? 139 1.0 ? 5.5/ ? 86.9 ? 29.0/ + 71.2 ? 28.2/ + 64.7 + 15.7/ + 140 ? 6.4/ ? 137 ? 4.6/ + 24.8 + 16.7/ + 137 ? 4.4/ + 25.1 ? 9.0/ ? 138 1.125 ? 5.6/ ? 93.3 ? 28.4/ + 75.6 ? 27.6/ + 65.6 + 14.9/ + 138 ? 6.2/ ? 129 ? 4.8/ + 28.0 + 16.0/ + 132 ? 4.6/ + 28.3 ? 8.6/ ? 137 1.25 ? 5.7/ ? 98.0 ? 27.9 / + 79.8 ? 27.2/ + 66.9 + 14.3/ + 138 ? 6.1/ ? 121 ? 4.9/ + 31.9 + 15.3/ + 129 ? 4.7/ + 32.1 ? 8.2/ ? 135 1.375 ? 5.7/ ? 102 ? 27.3/ + 84.0 ? 26.8/ + 68.0 + 13.7/ + 138 ? 6.3/ ? 113 ? 4.9/ + 35.7 + 14.5/ + 126 ? 4.8/ + 35.8 ? 7.9/ ? 133 1.5 ? 5.8/ ? 104 ? 26.8/ + 87.8 ? 26.5/ + 69.4 + 13.1/ + 138 ? 6.6/ ? 105 ? 5.0/ + 39 .4 + 13.7/ + 123 ? 4.8/ + 39.4 ? 7.5/ ? 131 1.625 ? 5.9/ ? 104 ? 26.2/ + 91.6 ? 26.3/ + 71.5 + 12.6/ + 138 ? 7.2/ ? 97.2 ? 5.0/ + 43.5 + 12.9/ + 122 ? 4.8/ + 43.5 ? 7.2/ ? 129 1.75 ? 5.8/ ? 104 ? 25.7/ + 94.8 ? 26.2/ + 73.9 + 12.2/ + 138 ? 8.0/ ? 91.0 ? 4.9/ + 47.0 + 12.1/ + 121 ? 4.7/ + 47.0 ? 6.9/ ? 127 1.875 ? 5. 8/ ? 103 ? 25.1/ + 98.2 ? 26.0/ + 76.8 + 11.8/ + 139 ? 9.2/ ? 86.4 ? 4.7/ + 50.5 + 11.3/ + 122 ? 4.5/ + 50.5 ? 6.7/ ? 126 2.0 ? 5.6/ ? 101 ? 24.6/ + 101 ? 26.0/ + 80.1 + 11.5/ + 139 ? 10.7/ ? 85.8 ? 4.5/ + 53.6 + 10.5/ + 123 ? 4.4/ + 53.6 ? 6.6/ ? 125 2.125 ? 5.5/ ? 99.3 ? 24.0/ + 104 ? 25.9/ + 85.1 + 11.2/ + 139 ? 12. 4/ ? 92.3 ? 4.4/ + 56.6 + 9.8/ + 125 ? 4.2/ + 56.6 ? 6.5/ ? 125 2.25 ? 5.3/ ? 97.2 ? 23.6/ + 106 ? 25.7/ + 91.0 + 10.8/ + 139 ? 13.4/ ? 110 ? 4.3/ + 59.1 + 9.3/ + 129 ? 4.1/ + 59.1 ? 6.6/ ? 125 2.375 ? 5.1/ ? 95.9 ? 23.2/ + 109 ? 25.3/ + 96.7 + 10.4/ + 139 ? 12.0/ ? 129 ? 4.3/ + 61.6 + 8.9/ + 132 ? 4.1/ + 61.7 ? 6.9/ ? 1 27 2.5 ? 4.9/ ? 94.8 ? 23.0/ + 111 ? 24.6/ + 103 + 9.9/ + 140 ? 9.4/ ? 136 ? 4.4/ + 64.3 + 8.9/ + 136 ? 4.2/ + 64.4 ? 7.4/ ? 128 2.625 ? 4.8/ ? 94.4 ? 22.9/ + 114 ? 23.8/ + 108 + 9.2/ + 141 ? 6.9/ ? 135 ? 4.6/ + 67.3 + 9.0/ + 139 ? 4.4/ + 67.4 ? 8.2/ ? 130 2.75 ? 4.8/ ? 94.8 ? 23.0/ + 118 ? 22.8/ + 111 + 8.4/ + 143 ? 4 .9/ ? 127 ? 5.1/ + 70.9 + 9.3/ + 140 ? 4.9/ + 71.0 ? 9.2 / ? 132 2.875 ? 4.9/ ? 95.4 ? 23.3/ + 122 ? 21.8/ + 114 + 7.5/ + 146 ? 3.4/ ? 117 ? 5.7/ + 75.0 + 9.6/ + 141 ? 5.5/ + 75.2 ? 10.5/ ? 133 3.0 ? 5.2/ ? 96.9 ? 23.8/ + 127 ? 20.9/ + 114 + 6.4/ + 149 ? 2.2/ ? 104 ? 6.4/ + 79.7 + 9.9/ + 140 ? 6.2/ + 79.8 ? 12.2/ ? 133 3 .125 ? 5.6/ ? 98.9 ? 24.5/ + 133 ? 20.0/ + 114 + 5.1/ + 153 ? 1.4/ ? 89.0 ? 7.5/ + 85.2 + 10.2/ + 138 ? 7.2/ + 85.0 ? 14.2/ ? 132 3.25 ? 6.1/ ? 102 ? 25.4/ + 139 ? 19.2/ + 114 + 3.5/ + 157 ? 0.89/ ? 73.4 ? 8.8/ + 90.4 + 10.3/ + 136 ? 8.5/ + 90.4 ? 16.2/ ? 126 3.375 ? 6.6/ ? 105 ? 26.4/ + 144 ? 18.6/ + 112 + 1.9/ + 162 ? 0.59/ ? 57.8 ? 10.2/ + 95.5 + 10.4/ + 133 ? 9.9/ + 95.4 ? 177/ ? 116 3.5 ? 7.2/ ? 110 ? 27.5/ + 149 ? 18.0/ + 111 + 0.27/ + 165 ? 0.41/ ? 42.6 ? 11.6/ + 100 + 10.3/ + 130 ? 11.4/ + 99.7 ? 18.1/ ? 104 3.625 ? 7.7/ ? 115 ? 28.6/ + 154 ? 17.6/ + 109 ? 1.3/ + 169 ? 0.23/ ? 27.6 ? 13.1/ + 104 + 10.2/ + 127 ? 12.7/ + 104 ? 17.1/ ? 93.5 3.75 ? 8.1/ ? 123 ? 29.4/ + 158 ? 17.3/ + 106 ? 2.7/ + 172 + 0.035/ ? 12.8 ? 14.3/ + 109 + 10.0/ + 124 ? 14.0/ + 108 ? 15.7/ ? 88.0 3.875 ? 8.3/ ? 132 ? 30.1/ + 163 ? 17.0/ + 103 ? 3.9/ + 175 + 0.45/ + 2.3 ? 15.4/ + 114 + 9.7/ + 119 ? 15.1/ + 113 ? 14.0/ ? 87.7 4.0 ? 8.2/ ? 140 ? 30.6/ + 168 ? 16.9/ + 99 .8 ? 4.8/ ? 180 + 1.0/ + 18.9 ? 16.3/ + 120 + 9.4/ + 115 ? 16.0/ + 120 ? 12.5/ ? 89.2
data sheet ADL5521 rev. b | page 5 of 24 absolute maximum rat ings table 4 . parameter rating supply voltage, v pos 5.5 v rf input level 7 dbm rf input level (with 8 ? s eries resistor on vpos) 20 dbm internal power dissipation 5 00 mw ja ( junction to air ) 50 c/w maximum junction temperature 150 c operating temperature range ?40 c to +85 c storage temperature range ? 65 c to + 150 c stresses above those listed under absolute maximum ratings may cau se permanent damage to the device. this is a stress rating only; functional operation of the device at these or any other conditions above those indicated in the operational section of this specification is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability. esd caution
ADL5521 data sheet rev. b | page 6 of 24 pin configuration a nd function descri p tions 1 vbias 2 rfin 3 nc 4 nc 7 rfout 8 vpos 6 nc 5 nc ADL5521 top view (not to scale) exposed pad notes 1. nc = no connect. 2. connect the exposed pad to a low impedance ground plane. 06828-002 figure 2. pin configuration table 5 . pin function descriptions pin no. mne monic description 1 vbias internal dc b ias. this pin should be connected to vpos through the r1 resistor. 2 rfin rf input. this is the input to the lna. 3, 4, 5, 6 nc no connection. no internal connection. 7 rfout rf output. 8 vpos supply voltage. dc bias needs to be bypassed to ground using a low inductance capacitor. this pin is also used for output matching. see the basic connections section. 9 (epad) exposed pad (epad) gnd. connect the exposed pad to a low impedance gr ound plane.
data sheet ADL5521 rev. b | page 7 of 24 typical performance characteristics 900 mh z , v pos = 5 v matched for optimal noise figure, external matching circuit included. 25 ?35 ?30 ?25 ?20 ?15 ?10 ?5 0 5 10 15 20 600 650 700 750 800 850 900 950 1000 1050 1100 1150 1200 s-parameters (db) frequency (mhz) s11 s21 s12 s22 06828-003 figure 3 . typical s - parameters, log magnitude 22 0 2 4 6 8 10 12 14 16 18 20 55 0 5 10 15 20 25 30 35 40 45 50 850 860 870 880 890 900 910 920 930 940 950 noise figure and gain (db) oip3 and p1db (dbm) frequency (mhz) gain oip3 p1db noise figure 06828-004 figure 4. noise figure, gain, oip3 , and p1db vs. frequency 2.0 1.8 1.6 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0 800 1000 980 960 940 920 900 880 860 840 820 noise figure (db) frequency (mhz) ?40c +85c +25c 06828-005 figure 5. noise figure vs. temperature 2.0 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 800 820 840 860 880 900 920 940 960 1000 980 noise figure (db) frequency (mhz) 06828-006 figure 6. noise figure vs. frequency at 25c , multiple devices 23.0 18.0 18.5 19.0 19.5 20.0 20.5 21.0 21.5 22.0 22.5 39 19 21 23 25 27 29 31 33 35 37 850 860 870 880 890 900 910 920 930 940 950 gain (db) oip3 and p1db (dbm) frequency (mhz) 06828-007 +85c +85c +25c +25c ?40c ?40c ?40c +85c +25c oip3 gain p1db figure 7. gain, oip3 , and p1db vs. temperature 42 40 38 36 34 32 30 28 26 24 22 20 ?4 ?2 22 20 18 16 14 12 10 8 6 4 2 0 oip3 (dbm) p out per tone (dbm) 06828-008 ?40c +85c +25c figure 8 . oip3 vs. output power (p out ) and temperature
ADL5521 data sheet rev. b | page 8 of 24 1950 mh z , v pos = 5 v matched for optimal noise figure, external matching circuit included. 20 ?35 ?30 ?25 ?20 ?15 ?10 ?5 0 5 10 15 1800 1850 1900 1950 2000 2050 2100 2150 2200 s-parameters (db) frequency (mhz) s11 s21 s12 s22 06828-009 figure 9 . typic al s - parameters, log magnitude 18 0 2 4 6 8 10 12 14 16 45 0 5 10 15 20 25 30 35 40 1920 1930 1940 1950 1960 1970 1980 noise figure and gain (db) oip3 and p1db (dbm) frequency (mhz) gain oip3 p1db noise figure 06828-010 figure 10 . noise figure, gain, oip3, and p1db vs. frequency 2.0 1.8 1.6 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0 1800 2000 1980 1960 1940 1920 1900 1880 1860 1840 1820 noise figure (db) frequency (mhz) ?40c +85c +25c 06828-011 figure 11 . noise figure vs. temperature 2.0 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 1800 1820 1840 1860 1880 1900 1920 1940 1960 2000 1980 noise figure (db) frequency (mhz) 06828-012 figure 12 . noise figure vs. frequen cy at 25c , multiple devices 18.0 13.0 13.5 14.0 14.5 15.0 15.5 16.0 16.5 17.0 17.5 39 19 21 23 25 27 29 31 33 35 37 1920 1930 1940 1950 1960 1970 1980 gain (db) oip3 and p1db (dbm) frequency (mhz) 06828-013 ?40c ?40c +85c +85c +25c +25c gain ?40c +85c +25c oip3 p1db figure 13 . gain, oip3 , and p1db vs. temperature 40 38 36 34 32 30 28 26 24 22 20 ?8 ?4 ?6 ?2 20 18 16 14 12 10 8 6 4 2 0 oip3 (dbm) p out per tone (dbm) 06828-014 ?40c +85c +25c figure 14 . oip3 vs. output power (p out ) and temperature
data sheet ADL5521 rev. b | page 9 of 24 2600 mhz, v pos = 5 v matched for optimal noise figure, ext ernal matching circuit included. 20 ?25 ?20 ?15 ?10 ?5 0 5 10 15 2100 2200 2300 2400 2500 2600 2700 2800 2900 s-parameters (db) frequency (mhz) s11 s21 s12 s22 06828-015 figure 15 . typical s - parameters, log magnitude 14 0 2 4 6 8 10 12 45 10 15 20 25 30 35 40 2500 2520 2540 2560 2580 2600 2620 2640 2660 2680 2700 noise figure and gain (db) oip3 and p1db (dbm) frequency (mhz) gain oip3 p1db noise figure 06828-016 figure 16 . noise figure, gain, oip3, and p1db vs. frequency 2.0 1.8 1.6 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0 2500 2700 2680 2660 2640 2620 2600 2580 2560 2540 2520 noise figure (db) frequency (mhz) ?40c +85c +25c 06828-017 figure 17 . noise figure vs. temperature 2.0 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2500 2520 2540 2560 2580 2600 2620 2640 2660 2700 2680 noise figure (db) frequency (mhz) 06828-018 figure 18 . noise figure vs. frequency at 25c , multiple devices 15.0 10.0 10.5 11.0 11.5 12.0 12.5 13.0 13.5 14.0 14.5 39 19 21 23 25 27 29 31 33 35 37 2500 2540 2560 2580 2600 2620 2640 2660 2680 2520 2700 gain (db) oip3 and p1db (dbm) frequency (mhz) 06828-019 ?40c +85c +25c ?40c ?40c +25c +85c +85c +25c oip3 p1db gain figure 19 . gain, oip3, and p1db vs. temperature 40 38 36 34 32 30 28 26 24 22 20 ?6 ?4 ?2 20 18 16 14 12 10 8 6 4 2 0 oip3 (dbm) p out per tone (dbm) 06828-020 ?40c +85c +25c figure 20 . oip3 vs. output power (p out ) and temperature
ADL5521 data sheet rev. b | page 10 of 24 3500 mh z , v pos = 5 v matched for optimal noise figure, external matching circuit included. 15 ?25 ?20 ?15 ?10 ?5 0 5 10 2800 2900 3000 3100 3200 3300 3400 3500 3600 3700 s-parameters (db) frequency (mhz) s11 s21 s12 s22 06828-021 figure 21 . typical s - parameters, log magnitude 12 0 2 4 6 8 10 45 15 20 25 30 35 40 3400 3420 3440 3460 3480 3500 3520 3540 3560 3580 3600 noise figure and gain (db) oip3 and p1db (dbm) frequency (mhz) gain oip3 p1db noise figure 06828-022 figure 22 . noise figure, gain, oip3, an d p1db vs. frequency 2.0 1.8 1.6 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0 3400 3600 3580 3560 3540 3520 3500 3480 3460 3440 3420 noise figure (db) frequency (mhz) ?40c +85c +25c 06828-023 figure 23 . noise figure vs. temperature 2.0 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 3400 3420 3440 3460 3480 3500 3520 3540 3560 3600 3580 noise figure (db) frequency (mhz) 06828-024 figure 24 . noise figure vs. frequency at 25c , multiple devices 13.0 7.5 8.0 8.5 9.0 9.5 10.0 10.5 11.0 11.5 12.0 12.5 40 38 36 34 32 30 28 26 24 22 20 18 3400 3440 3460 3480 3500 3520 3540 3560 3580 3420 3600 gain (db) oip3 and p1db (dbm) frequency (mhz) 06828-025 ?40c ?40c +25c +85c +85c +25c ?40c +85c +25c oip3 gain p1db figure 25 . gain, oip3, and p1db vs. temp erature 40 27 28 29 30 31 32 33 34 35 36 37 38 39 ?14 ?12 ?10 ?8 ?6 ?4 ?2 0 2 4 6 8 10 12 14 16 oip3 (dbm) p out per tone (dbm) 06828-026 ?40c +85c +25c figure 26 . oip3 vs. output power (p out ) and temperature
data sheet ADL5521 rev. b | page 11 of 24 900 mh z , v pos = 3 v matched for optimal noise figure, external matching circuit included. 25 ?45 ?40 ?35 ?30 ?25 ?20 ?15 ?10 ?5 0 5 10 15 20 600 650 700 750 800 850 900 950 1000 1050 1100 1150 1200 s-parameters (db) frequency (mhz) s11 s21 s12 s22 06828-027 figure 27 . typical s - parameters, log ma gnitude 22 20 18 16 14 12 10 8 6 4 2 0 34 32 30 28 26 24 22 20 18 16 14 12 850 860 870 880 890 900 910 920 930 940 950 noise figure and gain (db) oip3 and p1db (dbm) frequency (mhz) gain oip3 p1db noise figure 06828-028 figure 28 . noise figure, gain, oip3, and p1db vs. frequency 2.0 1.8 1.6 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0 800 1000 980 960 940 920 900 880 860 840 820 noise figure (db) frequency (mhz) ?40c +85c +25c 06828-029 figure 29 . noise figure vs. temperature 2.0 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 800 820 840 860 880 900 920 940 960 1000 980 noise figure (db) frequency (mhz) 06828-030 figure 30 . noise figure vs. frequency at 25c , multiple de vices 22.5 22.0 21.5 21.0 20.5 20.0 19.5 19.0 18.5 32 30 28 26 24 22 20 18 16 850 870 880 890 900 910 920 930 940 860 950 gain (db) oip3 and p1db (dbm) frequency (mhz) 06828-031 ?40c ?40c +85c +25c +85c +25c oip3 gain p1db ?40c +85c +25c figure 31 . gain, oip3, and p1db vs. temperature 31 30 29 28 27 26 25 24 23 22 21 20 19 18 ?4 ?2 0 2 4 6 8 10 12 14 16 18 20 oip3 (dbm) p out per tone (dbm) 06828-032 ?40c +85c +25c figure 32 . oip3 vs. output power (p out ) and temperature
ADL5521 data sheet rev. b | page 12 of 24 1950 mh z , v pos = 3 v matched for optimal noise figure, external matching circuit i ncluded. 20 15 ?35 ?25 ?30 ?20 ?15 ?10 ?5 0 5 10 1800 1850 1900 1950 2000 2050 2100 2150 2200 s-parameters (db) frequency (mhz) s11 s21 s12 s22 06828-033 figure 33 . typical s - parameters, log magnitude 16 0 2 4 6 8 12 14 10 32 16 18 20 22 24 26 28 30 1920 1930 1940 1950 1960 1970 1980 noise figure and gain (db) oip3 and p1db (dbm) frequency (mhz) gain oip3 p1db noise figure 06828-034 figure 34 . noise figure, gain, oip3, and p1db vs. frequency 2.0 1.8 1.6 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0 1800 2000 1980 1960 1940 1920 1900 1880 1860 1840 1820 noise figure (db) frequency (mhz) ?40c +85c +25c 06828-035 figure 35 . noise figure vs. temperature 2.0 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 1800 1820 1840 1960 1980 1900 1920 1940 1960 2000 1980 noise figure (db) frequency (mhz) 06828-036 figure 36 . noise figure vs. frequency at 25c , multiple devices 17.5 17.0 16.5 16.0 15.5 15.0 14.5 14.0 13.5 32 30 28 26 24 22 20 18 16 1920 1930 1940 1950 1960 1970 1980 gain (db) oip3 and p1db (dbm) frequency (mhz) 06828-037 ?40c ?40c +85c +85c +25c ?40c +85c +25c +25c oip3 gain p1db figure 37 . gain, oip3, and p1db vs. temperature 32 31 18 19 20 21 22 23 24 25 26 27 28 29 20 ?8 ?6 ?4 ?2 0 2 4 6 8 10 12 14 18 16 oip3 (dbm) p out per tone (dbm) 06828-038 ?40c +85c +25c figure 38 . oip3 vs. output power (p out ) and temperature
data sheet ADL5521 rev. b | page 13 of 24 2600 mh z , v pos = 3 v matched for optimal noise figure, external matching circuit included. 20 ?25 ?20 ?15 ?10 ?5 0 5 10 15 2100 2200 2300 2400 2500 2600 2700 2800 2900 s-parameters (db) frequency (mhz) s12 s22 06828-039 s11 s21 figure 39 . typical s - parameters, log magnitude 20 0 2 4 6 8 12 16 18 14 10 34 32 14 16 18 20 22 24 26 28 30 2500 2520 2540 2560 2580 2600 2620 2640 2660 2680 2700 noise figure and gain (db) oip3 and p1db (dbm) frequency (mhz) gain oip3 p1db noise figure 06828-040 figure 40 . noise figure, gain, oip3, and p1db vs. frequency 2.0 1.8 1.6 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0 2500 2700 2680 2660 2640 2620 2600 2580 2560 2540 2520 noise figure (db) frequency (mhz) ?40c +85c +25c 06828-041 figure 41 . noise figure vs. temperature 2.0 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2500 2520 2540 2560 2580 2600 2620 2640 2660 2700 2680 noise figure (db) frequency (mhz) 06828-042 figure 42 . noise figure vs. frequency at 25c , multiple devices 14.5 14.0 13.5 13.0 12.5 12.0 11.5 11.0 10.5 10.0 34 32 30 28 26 24 22 20 18 16 2500 2520 2560 2580 2620 2660 2700 2540 2600 2640 2680 gain (db) oip3 and p1db (dbm) frequency (mhz) 06828-043 ?40c ?40c +85c +85c +25c ?40c +85c +25c +25c oip3 gain p1db figure 43 . gain, oip3, and p1db vs. temperature 33 31 32 30 17 18 19 20 21 22 23 24 25 26 27 28 29 ?6 ?4 ?2 0 2 4 6 8 10 12 14 18 16 oip3 (dbm) p out per tone (dbm) 06828-044 ?40c +85c +25c figure 44 . oip3 vs. output power (p out ) and temperature
ADL5521 data sheet rev. b | page 14 of 24 3500 mh z , v pos = 3 v matched for optimal noise figure, external matching circuit included. 15 ?25 ?20 ?15 ?10 ?5 0 5 10 2800 2900 3000 3100 3200 3300 3400 3500 3700 3600 s-parameters (db) frequency (mhz) s11 s21 s12 s22 06828-045 figure 45 . typical s - parameters, log magnitude 20 18 16 0 2 4 6 8 12 14 10 34 14 16 18 20 22 24 26 28 30 32 3400 3420 3440 3460 3480 3500 3520 3540 3560 3580 3600 noise figure and gain (db) oip3 and p1db (dbm) frequency (mhz) gain oip3 p1db noise figure 06828-046 figure 46 . noise figure, gain, oip3, and p1db vs. frequency 2.0 1.8 1.6 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0 3400 3600 3580 3560 3540 3520 3500 3480 3460 3440 3420 noise figure (db) frequency (mhz) ?40c +85c +25c 06828-047 figure 47 . noise figure vs. temperature 2.0 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 3400 3420 3440 3460 3480 3500 3520 3540 3560 3600 3580 noise figure (db) frequency (mhz) 06828-048 figure 48 . noise figure vs. frequency at 25c , multiple devices 13.0 12.5 12.0 11.5 11.0 10.5 10.0 9.5 9.0 8.5 8.0 35 33 31 29 27 25 23 21 19 17 15 3400 3420 3460 3480 3520 3560 3600 3440 3500 3540 3580 gain (db) oip3 and p1db (dbm) frequency (mhz) 06828-049 ?40c ?40c +25c +85c ?40c +85c +85c +25c +25c oip3 gain p1db figure 49 . gain, oip3, and p1db vs. temperature 35 34 33 32 31 30 29 28 27 26 25 24 23 22 21 ?14 ?12 ?10 ?8 ?6 ?4 ?2 0 2 4 6 8 10 12 14 16 oip3 (dbm) p out per tone (dbm) 06828-050 ?40c +85c +25c figure 50 . oip3 vs. output power (p out ) and temperature
data sheet ADL5521 rev. b | page 15 of 24 dc c haracteristics 75 70 65 60 55 50 45 40 35 30 25 20 ?40 ?30 ?20 ?10 0 10 20 30 40 50 60 70 80 90 supply current (ma) temperature (c) vpos = 5v vpos = 3v 06828-051 figure 51 . supply current vs. temperature, 3 v and 5 v 200 0 20 40 60 80 100 120 140 160 180 ?6 ?4 ?2 0 2 4 6 8 10 12 14 16 18 20 22 06828-100 supply current (ma) p out (dbm) 5v, +25c 5v, ?40c 5v, +85c 3v, +25c 3v, ?40c 3v, +85c figure 52 . supply current vs. p out and temperature, 3 v and 5 v
ADL5521 data sheet rev. b | page 16 of 24 basic connections the basic connections for operating the ADL5521 are shown in figure 53. capacitor c5 provides the power supply decoupling. inductor l1 (coilcraft 0403hq or 0402hp s eries) and c apacitor c1 (murata high - q gjm s eries or equivalent) provide the input impedance matching , and the o utput impedance matching is prov ided by either l2 or c3 . resistor r1 is used to set the supply current, and the value of r1 is indirect ly proportional to the supply current (that is, increasing the value of r1 reduces the supply current). the recommended external components for the selec ted frequencies are listed in table 7 . for 5 v applications where the input power exceed s the input compression point of approximately 7 dbm, a series resistor ( r2 ) of at least 8 ?, with a high power rating (0.2 w minimum), shoul d be ins ert ed on the vpos line to protect the device from the input power overdrive . in this case, reduce r esistor r1 from 1.3 k ? to 600 ? to keep the supply current at around 60 ma. with r2 = 8 .2 ? (susumu rp1608s - 8r2 - f) and r1 = 600 ? , the gain and noise figure for the ADL5521 are mostly unchanged. table 6 lists oip3 and p1db at selected frequencies . for 3 v power supply applications, a series resistor is not necessa ry for the expected input overdrive powers up to 20 dbm. 06828-052 1 vbias 2 rfin 3 nc 4 nc 7 rfout 8 vpos 6 nc 5 nc ADL5521 z1 rfin rfout c1 l1 tr2 tr1 l2 c3 c5 100nf w1 vpos gnd r1 r2 figure 53 . ADL5521 basic connections table 6 . ADL5521 p erformance at vpos = 5 v , 25c with r2 = 8.2 ? and r1 = 600 ? freuenc m n oise f igure db ain db p1db dbm oip3 dbm p ot = 0 dbm 900 0.9 20.8 20.8 34.0 1950 1.0 15.8 21.0 35.0 2600 1.0 13.0 20.6 35.0 3500 1.1 10.5 20.3 36.0
data sheet ADL5521 rev. b | page 17 of 24 evaluation board figure 54 shows the schematic of the ADL5521 evaluation board. t he board is powered by a single supply, and dc bias can be applied to the board through clip - on leads at vpos and gnd or through a 2- pin connector , w1. the evaluation board comes optimized at 1950 mhz from the factory, but it can be easily modified to work at any frequency between 400 mhz and 4 ghz. table 7 lists the recommended components at various frequencies. 06828-152 1 vbias 2 rfin 3 nc 4 nc 7 rfout 8vpos 6 nc 5 nc ADL5521 z1 rfin rfout c2 0? c1 l1 tr2 tr1 l2 c3 c4 dnp c5 100nf w1 vpos gnd r1 r2 figure 54 . evaluation board schematic 06828-053 figure 55 . evaluation board layout (top view ) 06828-054 figure 56 . evaluation board layout (bottom view ) soldering information and recommended pcb land pattern figure 57 shows the recommended land pattern for ADL5521 . to minimize t hermal impedance, the exposed pad on the package underside is soldered down to a ground plane. if multiple ground layers exist, they are stitched together using vias (a minimum of five vias is recommended). pin 3 to pin 6 can be left unconnected or can be connected to ground. for more information on land pattern design and layout, refer to the an - 772 application note , a design and manufacturing guide for the lead frame chip scale package (lfcsp) . 1.53mm 0.5mm 1.78mm 1.85mm 2.03mm 4 5 8 0.71mm 1 06828-055 figure 57 . recommended land pattern table 7 . recommended components and positions of matching components for basic connections tuned for optimal noise frequency (mhz) c1 1 (size 0402) c2 (size 0402) c3 (size 0402) c4 (size 0402) c5 (size 0402) l1 2 (size 0403) l2 2 (size 0403) r1 3 (size 0603) r2 4 (size 0603) tr1 (mm) tr2 (mm) c1 position c3 position 500 open 0 ? open open 100 nf 9 nh 12 nh 1.3 k? 0 ? 0 0 c1 n/a 900 2.4 pf 0 ? open open 100 nf 8.2 nh 3.4 nh 1.3 k? 0 ? 0 0 c1 n/a 1300 2.7 pf 0 ? 1.0 nf open 100 nf 3.4 nh 0 ? 1.3 k? 0 ? 0 8.0 0.6 c1 6 1950 1.6 pf 0 ? 1.0 nf open 100 nf 1.0 nh 0 ? 1.3 k? 0 ? 2. 5 0.6 5.5 0.6 c1 4 2140 1.6 pf 0 ? 1.0 nf open 100 nf 1.0 nh 0 ? 1.3 k? 0 ? 5.0 0.6 3.0 0.6 c1 2 2600 0.75 pf 0 ? 1.0 nf open 100 nf 1.0 nh 0 ? 1.3 k? 0 ? 8.0 0.6 0 c1 c3 3500 0.5 pf 0 ? 1.0 nf open 100 nf 2.4 pf 5 0 ? 1.3 k? 0 ? 7.0 0.6 1 0.6 c1 1 1 the murata high - q gjm s eries capacitor is recommended for c1 . 2 coilcraft hig h q 0403hq or 0402hp inductors are recommended for l1 and l2 . 3 if r2 = 8 ?, reduce r1 to 600 ?. 4 if r2 = 8 ?, use a hi gh power resistor (0.2 w rating minimum). 5 note that at 3500 mhz, a c apacitor, not an inductor, is used at l1 .
ADL5521 data sheet rev. b | page 18 of 24 t uning the ADL5521 for optimal noise fi gure the ADL5521 is a monolithic low noise amplifier ( lna ) in a 3 mm 3 mm lfcsp. the eval uation board, as shipped from the factory, give s a noise figure of 0.9 db over a bandwidth of several hundred megahertz . the specific frequency where optimal noise is reached depends on the tuning. the bandwidth of the ADL5521 is 400 mhz to 4 ghz, although noise f igure degrade s above 2.5 ghz as the gain begins to roll off. this section is based on analog devices, inc. , lab measurements. although there are plots in which the agil ent advanced design system ( ads ) environment is used, the data in these plots comes from analog devices lab measurements. tuning s22 tuning of the lna begins with s22 (output tuning). tuning of the lna output is done by placing reactive components on the b ias line, referred to in the schematic in figure 54 as vpos. on the lna eval uation board, s22 tuning is achieved by either the use of an inductor (l2) on the bias line or a shunt cap acitor ( c3) on the bias line to ground. typica lly, either l2 is required or c3 , but not both. the evaluation board uses a slider on the bias line to make tuning for s22 as easy as possible. the slider is an area of ground etch adjacent to the bias line that is clear of solder mask. the bias line in th is area is also free of solder mask. this allows a capacitor (c3) to be placed anywhere on the bias line to ground , which provides easy and accurate tuning for s22. note that the pcb layout shows two capacitors, c3 and c4. typically , only one of these cap acitors is needed for good s22 tuning. the slider can be seen in the lna pcb layout in figure 58 as the area near the red arrows to the right of the bias line. with a 0 ? resistor in place of l2, moving a 1 nf capacitor from the top to the bottom effectively tunes s22 from 1400 mhz to 3500 mhz. table 8 shows the component values and placement required for s22 tuning from 800 mhz to 3200 mhz. for lower frequencies, higher values of l2 can be used to tune s22, and for frequencies from 3.2 ghz to 4.0 ghz, smaller values of capacitors can be used on the slider. table 8 . capacitor and inductor tuning and placement for lna s22 tuning frequency (mhz) l2 c3 c3 placement 800 3.4 nh open n/a 1400 0 ? 1 nf 6 2000 0 ? 1 nf 4 2400 0 ? 1 nf 3 2800 0 ? 1 nf 2 3200 0 ? 1 nf 1 06828-056 figure 58 . pcb layout for lna eval uation board ( note slider on bias line with capacitor placement for s22 tuning noted by arrows )
data sheet ADL5521 rev. b | page 19 of 24 tuning the lna input for optimal gain lnas are generally tuned for either gain or noise optimization, or some trade-off between the two. one figure of merit of an lna is how much trade-off must be made for one of these parameters to optimize the other. with the ADL5521 , an s11 of 6 db to 8 db at the input to the matching network can still be achieved typically when optimizing for noise. for optimal gain matching, the goal is to use a matching network that converts the input impedance of the lna to the characteristic impedance of the system, typically 50 . correct tuning for gain matching results in a conjugate match. that is, the impedance of the matching network at the lna input, looking back toward the generator, is always the complex conjugate of the lna input impedance when matched for gain. once s11 * , the complex conjugate of s11, is known, a matching circuit must be found that transforms the 50 system impedance into the conjugate s11 impedance. to do this, the designer starts at the origin of the smith chart circle and finds components that move the 50 match to s11 * . the related impedances for gain matching are shown in figure 59. a smith chart representation of the conjugate match is shown in figure 60. lna s11 s11* 50? 50? matching network 06828-057 figure 59. matching lna input for gain s11* s11 06828-058 figure 60. smith chart representation of conjugate match tuning the lna input for optimal noise figure the point in the smith chart at which matching for optimal noise occurs is typically referred to as gamma optimal or opt . typically, it is significantly different from the gain matching point; finding opt is not as obvious as the gain match. opt is a function of the semiconductor structure and characteristics of the lna. the fabrication facility that produces the lna typically has this information. opt can also be determined by doing source pull testing in the lab. noise matching for the ADL5521 is very easy because the area of the smith chart where the noise figure is optimal or near optimal is not confined to a narrow area around opt . this is very advantageous because it means that component variations play a smaller part in the board-to-board variation of noise figure. the matching area for optimal noise for the ADL5521 is shown in figure 61. note that textbooks usually define noise circles as a conjugate match. however, for the purpose of this data sheet, the circle is a direct match. to find the correct matching circuit, the designer must start with the s11 of the lna and select components that move the s11 to within this circle. an important aspect of the overall ADL5521 ease of tuning is that as long as s22 is matched for a particular frequency, the noise matching area remains very consistent in its placement for that frequency. if s22 is matched, take the measured s11 and move it into the red circle shown in figure 61 for optimal noise matching. 5 10 10 5 1 1 0.5 0.5 0.2 0.2 0.2 0.5 1 5 10 06828-059 figure 61. area of opti mal noise matching for ADL5521
ADL5521 data sheet rev. b | page 20 of 24 s11 of the lna with s22 matched to determine the correct matching circuit for optimal noise, look at the results of s11 for the various frequencies at which s22 was tuned earlier in the tuning s22 section. once s11 is determined for a particular frequency, find the matching components that provided that match. figure 63 and figure 64 show s11 for the various frequencies. again, these measurements are all based on s22 being matched at that particular frequency. note that, for the examples shown in figure 63 and figure 64, s11 is either in the lower left quadrant of the smith chart or slightly into the upper left. to move the impedance in the given noise circle, a series l component at the lna input is required. the l values in the examples differ, but a correct l value moves the match along the constant r circle up into the upper left quadrant of the smith chart. a shunt capacitor can then be added to move the match along a constant admittance line, down and to the right, directly into the center of the noise circle given in figure 61. the solution for the structure of the match for the examples in figure 63 and figure 64 is a series l to the input of the lna and a shunt capacitor at the generator end of this inductor. the recommended components for matching at various frequencies are shown in table 7. an example of the effect of the series l, shunt c match, based on the 800 mhz example, is given in figure 62. this example uses the output from the agilent ads smith chart tool. 06828-060 figure 62. example of series l, shunt c matching network for opt m2 m1 frequency (400mhz to 4ghz) m1 frequency 400mhz s11 = 0.877/?44.639 impedance = z0 (0.443 ? j2.365) m2 frequency 2ghz s11 = 0.615/?170.569 impedance = z0 (0.240 ? j0.078) 06828-061 figure 63. s11 of ADL5521 with s22 matched at 2 ghz m2 m1 frequency (400mhz to 4ghz) m1 frequency 400mhz s11 = 0.864/?40.186 impedance = z0 (0.594 ? j2.615) m2 frequency 3.2ghz s11 = 0.595/163.164 impedance = z0 (0.259 + j0.138) 06828-062 figure 64. s11 of ADL5521 with s22 matched at 3.2 ghz
data sheet ADL5521 rev. b | page 21 of 24 outline dimensions 1 exposed pa d (bottom view) 0.50 bsc pin 1 indicator 0.50 0.40 0.30 top view 12 max 0.70 max 0.65 typ 0.90 max 0.85 nom 0.05 max 0.01 nom 0.20 ref 1.89 1.74 1.59 4 1.60 1.45 1.30 3.25 3.00 sq 2.75 2.95 2.75 sq 2.55 5 8 pin 1 indicator seating plane 0.30 0.23 0.18 0.60 max 0.60 max for proper connection of the exposed pad, refer to the pin configuration and function descriptions section of this data sheet. 04-04-2012-a figure 65. 8-lead lead frame chip scale package [lfcsp_vd] 3 mm 3 mm body, very thin, dual lead (cp-8-2) dimensions shown in millimeters ordering guide model 1 temperature range package description package option branding ADL5521acpz-r7 ?40c to +85c 8-lead lfcsp_vd, 7 tape and reel cp-8-2 q1g ADL5521-evalz evaluation board 1 z = rohs compliant part.
ADL5521 data sheet rev. b | page 22 of 24 notes
data sheet ADL5521 rev. b | page 23 of 24 notes
ADL5521 data sheet rev. b | page 24 of 24 notes ?2008C2013 analog devices, inc. all rights reserved. trademarks and registered trademarks are the prop erty of their respective owners. d06828-0-11/13(b)

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