_______________general description the MAX2650 is a low-noise amplifier for use from dc to microwave frequencies. operating from a single +5v supply, it has a flat gain response to 900mhz. the MAX2650? low noise figure and high drive capability make it ideal for a variety of transmit, receive, and buffer applications. the device is internally biased, eliminating the need for external bias resistors or inductors. in a typical applica- tion, the only external components needed are input and output blocking capacitors and a v cc bypass capacitor. the MAX2650 comes in a 4-pin sot143 package, requiring minimal board space. ________________________applications wireless local loop global positioning systems (gps) ism radios special mobile radios wireless local-area networks cellular base stations set-top boxes ____________________________features internally biased high gain: 18.3db at 900mhz 3.9db noise figure single +4.5v to +5.5v operation -1dbm output 1db compression power low-cost silicon bipolar design ultra-small sot143 package MAX2650 dc-to-microwave, +5v low-noise amplifier ________________________________________________________________ maxim integrated products 1 __________________pin configuration v cc c byp c block gnd out out v cc in c block in MAX2650 out v cc gnd 3 4 21 in sot143 top view MAX2650 __________typical operating circuit 19-1135; rev 1; 8/03 part MAX2650eus-t -40? to +85? temp range pin-package 4 sot143-4 evaluation kit available ______________ordering information for pricing, delivery, and ordering information, please contact maxim/dallas direct! at 1-888-629-4642, or visit maxim? website at www.maxim-ic.com.
MAX2650 dc-to-microwave, +5v low-noise amplifier 2 _______________________________________________________________________________________ absolute maximum ratings electrical characteristics (v cc = +5.0v, z 0 = 50 ? , f in = 900mhz, t a = +25?, unless otherwise noted.) stresses beyond those listed under ?bsolute maximum ratings?may cause permanent damage to the device. these are stress rating s only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specificatio ns is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability. note 1: parts are designed to operate over specified temperature range. specifications are production tested and guaranteed at +25?. v cc to gnd ..............................................................-0.3v to +8v input power ....................................................................+13dbm continuous power dissipation (t a = +70?) sot143-4 (derate 4mw/? above +70?)...................320mw operating temperature range ...........................-40? to +85? junction temperature ......................................................+150? storage temperature range .............................-65? to +150? lead temperature (soldering, 10s) .................................+300? (note 1) f in = 800mhz to 1000mhz f in = 100mhz to 1000mhz conditions db 16.5 18.3 21 power gain ? -40 85 operating temperature range 15.5 17.7 20.0 v 4.5 5.5 supply voltage ps 300 group delay 1.3:1 maximum output voltage standing-wave ratio dbm -1 output 1db compression point dbm 10 output ip3 db 3.9 noise figure 1.5:1 maximum input voltage standing-wave ratio units min typ max parameter t a = t min to t max 13.0 17.7 22.0 v cc = 4.5v to 5.5v ma 11.0 17.7 24.0 supply current caution! esd sensitive device
MAX2650 dc-to-microwave, +5v low-noise amplifier _______________________________________________________________________________________ 3 40 0 4.0 6.0 supply current vs. supply voltage 10 30 MAX2650-01 v cc (v) i cc (ma) 20 5.5 5.0 4.5 +85? -40? +25? 5 -5 0.1 0.3 1.5 output 1db compression point vs. frequency -1 -3 3 MAX2650-02 frequency (ghz) p -1 (dbm) 1 1.3 1.1 0.9 0.7 0.5 -40 c +25 c +85 c +5 -5 0.1 0.3 1.5 output 1db compression point vs. frequency -1 -3 +3 MAX2650-03 frequency (ghz) p -1 (dbm) +1 1.3 1.1 0.9 0.7 0.5 5.5v 4.5v 5.0v 25 0 0.1 0.3 1.5 gain vs. frequency 10 5 20 MAX2650-04 frequency (ghz) gain (db) 15 1.3 1.1 0.9 0.7 0.5 +85 c -40 c +25 c 3.5:1 1.0:1 0.1 0.3 1.5 voltage standing-wave ratio vs. frequency 2.0:1 out in 1.5:1 3.0:1 MAX2650-06 frequency (ghz) vswr 2.5:1 1.3 1.1 0.9 0.7 0.5 25 0 0.1 0.3 1.5 gain vs. frequency 10 5 20 MAX2650-05 frequency (ghz) gain (db) 15 1.3 1.1 0.9 0.7 0.5 5.5v 4.5v 5.0v 5 0 0.1 0.3 1.5 noise figure vs. frequency 2 +85 c -40 c 1 4 MAX2650-07 frequency (ghz) noise figure (db) 3 1.3 1.1 0.9 0.7 0.5 +25 c __________________________________________typical operating characteristics (v cc = 5.0v, z 0 = 50 ? , f in = 900mhz, t a = +25?, unless otherwise noted.)
MAX2650 dc-to-microwave, +5v low-noise amplifier 4 _______________________________________________________________________________________ table 1. typical scattering parameters (v cc = +5v, z 0 = 50 ? , t a = +25?.) 0.19 0.20 0.20 0.18 0.18 0.17 0.16 0.16 0.14 0.16 0.17 0.17 s11 (mag) -86 -66 -54 -39 -26 -17 -7 0 8 9 -6 -3 s11 (ang) 15.7 17.4 18.0 18.6 19.0 19.3 19.5 19.6 19.7 19.7 19.8 19.8 s21 (db) 6.10 7.40 7.92 8.46 8.93 9.21 9.43 9.52 9.70 9.69 9.72 9.76 s21 (mag) 51 73 84 95 107 119 129 140 151 161 172 177 s21 (ang) -26.9 -28.7 -29.5 -31.1 -31.7 -32.3 -33.2 -33.8 1.20 -35.0 -35.8 -36.7 0.20 -37.8 s12 (db) 0.045 0.10 0.037 0.033 0.05 0.028 0.026 0.024 0.022 1.00 0.020 0.018 0.016 0.90 0.015 0.013 s12 (mag) 0.80 52 50 48 0.70 44 41 37 0.30 34 32 28 0.40 23 14 8 0.50 s12 (ang) 0.05 0.10 0.60 0.13 0.17 0.21 frequency (ghz) 0.25 0.28 0.32 0.35 0.37 0.39 0.42 s22 (mag) -49 -76 -71 -62 -53 -43 -34 -26 -19 -13 -6 -5 s22 (ang) 1.88 1.88 1.91 2.10 2.09 2.12 2.24 2.31 2.54 2.70 2.92 3.18 k 1.40 0.16 -86 13.4 4.69 31 -25.5 0.053 51 0.12 -12 2.03 1.60 0.15 -66 10.6 3.40 14 -24.4 0.060 44 0.24 -17 2.32 1.80 0.22 -40 7.4 2.35 5 -24.4 0.060 32 0.35 -27 3.01 2.00 0.33 -36 4.6 1.70 4 -25.3 0.055 22 0.43 -33 3.97 2.20 0.41 -38 3.1 1.43 6 -26.5 0.047 21 0.46 -33 4.85 2.40 0.44 -37 2.5 1.34 6 -28.6 0.037 22 0.49 -29 6.26 2.50 0.44 -37 2.3 1.30 4 -29.5 0.034 22 0.49 -25 7.05 ______________________________________________________________pin description name function 1 in amplifier input. use a series blocking capacitor with less than 3 ? reactance at your lowest operating frequency. 2 gnd ground connection. for optimum performance, provide a low-inductance connection to the ground plane. pin 3 out amplifier output. use a series blocking capacitor with less than 3 ? reactance at your lowest operat- ing frequency. 4 v cc supply connection. bypass directly at the package pin. the value of the bypass capacitor is deter- mined by the lowest operating frequency and is typically the same as the blocking capacitor value. for long v cc lines, additional bypassing may be necessary.
_______________detailed description the MAX2650 is a broadband amplifier with flat gain and 50 ? input and output ports. its small size and inter- nal bias circuitry make it ideal for applications where board space is limited. __________applications information external components as shown in the typical operating circuit , the MAX2650 is easy to use. input and output series capacitors may be necessary to block dc bias volt- ages (generated by the MAX2650) from interacting with adjacent circuitry. these capacitors must be large enough to contribute negligible reactance in a 50 ? sys- tem at the minimum operating frequency. use the fol- lowing equation to calculate their minimum value: where f (in mhz) is the minimum operating frequency. the v cc pin must be rf bypassed for correct opera- tion. to accomplish this, connect a capacitor between the v cc pin and ground, as close to the package as is practical. use the same equation given above (for dc blocking capacitor values) to calculate the minimum capacitor value. if there are long v cc lines on the pc board, additional bypassing may be necessary. this may be done further away from the package, at your discretion. proper grounding of the gnd pin is essential. if the pc board uses a topside rf ground, the gnd pin should connect directly to it. for a board where the ground plane is not on the component side, the best technique is to connect the gnd pin to it through multiple plated through-holes. pc board layout example an example pc board layout is given in figure 1. it uses fr-4 with 31mil layer thickness between the rf lines and the ground plane. the board satisfies all the above requirements. c block = 53,000 f (pf) MAX2650 dc-to-microwave, +5v low-noise amplifier _______________________________________________________________________________________ 5 figure 1. example pc board layout expanded view rf in rf out v cc MAX2650
maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a maxim product. no circuit patent licenses are implied. maxim reserves the right to change the circuitry and specifications without notice at any time. 6 ___________________maxim integrated products, 120 san gabriel drive, sunnyvale, ca 94086 (408) 737-7600 ? 2003 maxim integrated products printed usa is a registered trademark of maxim integrated products. MAX2650 dc-to-microwave, +5v low-noise amplifier dc-to-microwave, +5v low-noise amplifier ________________________________________tape-and-reel/marking information 4-pin sot143-4 small-outline transistor package a a1 c d e e e1 b h i b1 millimeters inches min 0.787 0.025 0.356 0.762 0.086 2.667 1.194 1.778 1.803 2.083 0.102 max 1.194 0.127 0.559 0.965 0.152 3.048 1.397 2.032 2.007 2.489 0.305 min 0.031 0.001 0.014 0.030 0.0034 0.105 0.047 0.070 0.071 0.082 0.004 max 0.047 0.005 0.022 0.038 0.006 0.120 0.055 0.080 0.079 0.098 0.012 dim a a1 b b1 c d e e e1 h i 0?8 21-0052a 4.0 0.1 0.30 0.05 0.8 0.05 0.30r max. b o k o 2.2 0.1 0.5 radius typical a0 4.0 0.1 2.0 0.05 1.5 +0.1/-0.0 diameter 1.75 0.1 1.0 0.1 a 8.0 0.3 3.5 0.05 1.0 minimum a dh = MAX2650 ao = 3.1mm 0.1 bo = 2.7mm 0.1 ko = 1.2mm 0.1 x x x x lot specific code marking information note: dimensions are in mm. and follow eia481-1 standard. ics may also be marked with full part name: MAX2650 ? ? package information (the package drawing(s) in this data sheet may not reflect the most current specifications. for the latest package outline information, go to www.maxim-ic.com/packages .)
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