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. general description the max2640/max2641 are low-cost, ultra-low-noise amplifiers designed for applications in the cellular, pcs, gps, and 2.4ghz ism frequency bands. operating from a single +2.7v to +5.5v supply, these devices consume only 3.5ma of current while providing a low noise fig- ure, high gain, high input ip3, and an operating fre- quency range that extends from 300mhz to 2500mhz. the max2640 is optimized for 300mhz to 1500mhz applications, with a typical performance of 15.1db gain, input ip3 of -10dbm, and a noise figure of 0.9db at 900mhz. the max2641 is optimized for 1400mhz to 2500mhz applications, with a typical performance of 14.4db gain, an input ip3 of -4dbm, and a noise figure of 1.3db at 1900mhz. these devices are internally biased, eliminating the need for external bias resistors and chokes. in a typical application, the only external components needed are a two-element input match, input and output blocking capacitors, and a v cc bypass capacitor. the max2640/max2641 are designed on a high-fre- quency, low-noise, advanced silicon-germanium process and are offered in the space-saving 6-pin sot23 package. applications 315mhz/400mhz/900mhz/2.4ghz ism radios cellular/pcs handsets gps receivers cordless phones wireless lans wireless data automotive rke features ? wide operating frequency range max2640: 300mhz to 1500mhz max2641: 1400mhz to 2500mhz ? low noise figure max2640: 0.9db at 900mhz max2641: 1.2db at 1575mhz 1.3db at 1900mhz 1.5db at 2450mhz ? high gain max2640: 15.1db at 900mhz max2641: 15.7db at 1575mhz 14.4db at 1900mhz 13.5db at 2450mhz ? high reverse isolation max2640: 40db at 900mhz max2641: 31db at 1575mhz 30db at 1900mhz 24db at 2450mhz ? +2.7v to +5.5v single-supply operation ? low 3.5ma supply current ? ultra-small sot23-6 package max2640/max2641 300mhz to 2500mhz sige ultra-low-noise amplifiers ________________________________________________________________ maxim integrated products 1 c3 c4 z1 rfin c1 v cc v cc rfin c2 z m1 bias generator gnd lna rf out rf out max2640/1 z m2 *the series inductor z1 can be replaced by a transmission line of appropriate impedance and electrical length. frequency (mhz) c1 value (pf) c2 value (pf) c3 value (pf) c4 value (pf) z1* value (nh) zm1 value (pf) zm2 value max2640 max2641 900 1575 1900 2450 470 100 470 470 3 100 100 100 470 470 470 470 100 9.85 5.6 2.55 1.65 2 1 1 1 6.8nh 1pf 1pf typical operating circuits 19-1384; rev 3; 4/07 ordering information pin configuration appears at end of data sheet. evaluation kit available part temp range pin- package sot top mark max2640eut -t -40 c to +85 c 6 sot23-6 aaav max2640eut+t -40 c to +85 c 6 sot23-6 aaav max2640aut+t -40 c to +125 c 6 sot23-6 aaav max2641eut -t -40 c to +85 c 6 sot23-6 aaaw max2641eut+t -40 c to +125 c 6 sot23-6 aaaw + indicates lead-free package.
db max2640/max2641 300mhz to 2500mhz sige ultra-low-noise amplifiers 2 _______________________________________________________________________________________ absolute maximum ratings dc electrical characteristics (v cc = +2.7v to +5.5v, t a = -40? to +85? (max2640eut/max2641eut), t a = -40? to +125? (max2640aut) , unless otherwise noted. typical values are at v cc = +3.0v, t a = +25?.) limits at t a = +25? are guaranteed by production test. limits over temperature are guaranteed by design and characterizarion. 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. v cc to gnd .............................................................-0.3v to +6v rfin power (50 source) (note 1) ..................................+5dbm continuous power dissipation (t a = +70?) sot23-6 (derate 8.7mw/? above +70?)..................696mw operating temperature range max2640eut/max2641eut ...............................-40? to +85? max2640aut ....................................................-40? to +125? storage temperature range .............................-65? to +160? lead temperature (soldering, 10s) .................................+300? (note 6) (note 5) (note 4) t a = t min to t max t a = -40? to +85? (max2640eut) (note 4) conditions dbm -4 input third-order intercept point dbm -21 input 1db gain compression point db 30 reverse isolation db -12 output return loss db -12 input return loss db 1.3 1.5 noise figure db 0.9 2.4 gain variation over temperature db 12.4 14.4 gain mhz 1400 2500 rfin frequency range db 12.8 15.1 gain mhz 300 1500 rfin frequency range dbm -10 input third-order intercept point dbm -22 input 1db gain compression point db 40 reverse isolation 0.6 1.7 db 0.9 1.1 noise figure db -11 input return loss db -14 output return loss units min typ max parameter rf electrical characteristics (v cc = +3.0v, p rfin = -34dbm, z o = 50 , t a = +25?, unless otherwise noted.) (notes 2 and 3) note 1: pin must be ac-coupled with a dc blocking capacitor. caution! esd sensitive device t a = -40? to +125? (max2640aut) db 0.9 2.5 gain variation over temperature max2640 (f rfin = 900mhz) max2641 (f rfin = 1900mhz) t a = -40? to +125? (max2640aut) 7.8 2.7 5.5 operating supply voltage t a = -40? to +85? (max2640eut/max2641eut) ma conditions 6.4 operating supply current units min typ max parameter t a = +25? v 3.5 4.7
max2640/max2641 300mhz to 2500mhz sige ultra-low-noise amplifiers _______________________________________________________________________________________ 3 note 2: guaranteed by design and characterization. note 3: measured using typical operating circuit. input and output impedance matching networks were optimized for best simulta- neous gain and noise-figure performance. note 4: external component and circuit losses degrade noise-figure performance. specification excludes external component and circuit board losses. note 5: measured with two input tones, f 1 = 899mhz, f 2 = 901mhz, both at -34dbm per tone. note 6: measured with two input tones, f 1 = 1899mhz, f 2 = 1901mhz, both at -34dbm per tone. note 7: measured with two input tones, f 1 = 1574mhz, f 2 = 1576mhz, both at -34dbm per tone. note 8: measured with two input tones, f 1 = 2449mhz, f 2 = 2451mhz, both at -34dbm per tone. rf electrical characteristics (continued) (v cc = +3.0v, p rfin = -34dbm, z o = 50 , t a = +25?, unless otherwise noted.) (notes 2 and 3) (note 7) (note 4) conditions dbm +1.4 input third-order intercept point dbm -21 input 1db gain compression point db -31 reverse isolation db 15.7 gain db 1.2 noise figure db -8 input return loss db -15 output return loss units min typ max parameter (note 8) (note 4) dbm -2.5 input third-order intercept point dbm -19 input 1db gain compression point db -24 reverse isolation db 13.5 gain db 1.5 noise figure db -10 input return loss db -11 output return loss max2641 (f rfin = 1575mhz) max2641 (f rfin = 2450mhz) 0 2 1 4 3 5 6 24 356 max2640 supply current vs. supply voltage max2640-01 v cc (v) i cc (ma) t a = +85? t a = +25? t a = -40? 12 13 15 14 16 800 840 880 920 960 1000 max2640 matched at 900mhz gain vs. frequency max2640-01 frequency (mhz) gain (db) t a = -40? t a = +25? t a = +85? 0 1 2 3 800 880 840 920 960 1000 max2640 matched at 900mhz noise figure vs. frequency max2640-03 frequency (mhz) noise figure (db) t a = +85? t a = +25? t a = -40? typical operating characteristics (v cc = +3v, p rfin = -34dbm, typical operating circuits, t a = +25?, unless otherwise noted.)
max2640/max2641 300mhz to 2500mhz sige ultra-low-noise amplifiers 4 _______________________________________________________________________________________ typical operating characteristics (continued) (v cc = +3v, p rfin = -34dbm, typical operating circuits, t a = +25?, unless otherwise noted.) -60 -30 -40 -50 -20 -10 0 1800 1880 1840 1920 1960 2000 max2641 matched at 1900mhz reverse isolation vs. frequency max2640-10 frequency (mhz) reverse isolation (db) -16 -13 -14 -15 -12 -11 -10 -9 -8 -7 -6 1800 1850 1900 1950 2000 max2641 matched at 1900mhz input return loss and output return loss vs. frequency max2640-09 frequency (mhz) return loss (db) input return loss output return loss -16 -13 -14 -15 -12 -11 -10 -9 -8 -7 -6 800 850 900 950 1000 max2640 matched at 900mhz input return loss and output return loss vs. frequency max2640-04 frequency (mhz) return loss (db) input return loss output return loss 12 13 15 14 16 1800 1840 1880 1920 1960 2000 max2641 matched at 1900mhz gain vs. frequency max2640-07 frequency (mhz) gain (db) t a = -40? t a = +25? t a = +85? -60 -30 -40 -50 -20 -10 0 800 880 840 920 960 1000 max2640 matched at 900mhz reverse isolation vs. frequency max2640-05 frequency (mhz) reverse isolation (db) 0 2 1 4 3 5 6 24 356 max2641 supply current vs. supply voltage max2640-06 v cc (v) i cc (ma) t a = +85? t a = +25? t a = -40? 0 1 2 3 1800 1880 1840 1920 1960 2000 max2641 matched at 1900mhz noise figure vs. frequency max2640-08 frequency (mhz) noise figure (db) t a = +85? t a = +25? t a = -40?
max2640/max2641 300mhz to 2500mhz sige ultra-low-noise amplifiers _______________________________________________________________________________________ 5 detailed description the max2640 and max2641 are ultra-low-noise ampli- fiers that operate with rf input frequency ranges of 300mhz to 1500mhz (max2640) or 1400mhz to 2500mhz (max2641). these devices are available in sot23-6 packages and contain internal bias circuitry to minimize the number of required external components. their small size and low external component count make them ideal for applications where board space is limited. applications information external matching components the max2640/max2641 are easy to use, generally requiring only five external components as shown in the typical operating circuit . to reduce external compo- nent count further, replace external inductors with microstrip transmission lines. the high reverse isolation allows the tuning of the input matching network without affecting the output match, and vice versa. select input and output matching networks to obtain the desired combination of gain, noise figure, and return loss per- formance. the typical operating circuits show the rec- ommended input and output matching networks for the max2640/max2641 at 900mhz and 1900mhz, respectively. these values are optimized for best simultaneous gain, noise figure, and return loss perfor- mance. to aid in the design of matching networks for other frequencies, tables 1 and 2 list typical device s- parameters and tables 3 and 4 list typical device noise parameters. name function 1 rfin amplifier input. ac-couple to this pin with a dc blocking capacitor. use recommended input matching network (see typical operating circuit ). 2, 3, 5 gnd ground. for optimum performance, provide a low inductance connection to the ground plane. pin 4 rfout amplifier output. use the recommended series blocking or matching capacitor (see typical operating circuit ). 6 v cc supply voltage. bypass to ground directly at the supply pin. the value of the bypass capacitor is deter- mined by the lowest operating frequency. additional bypassing may be necessary for long v cc lines (see typical operating circuit ). pin description
max2640/max2641 300mhz to 2500mhz sige ultra-low-noise amplifiers 6 _______________________________________________________________________________________ table 2. max2641 typical scattering parameters at v cc = +3v, t a = +25? -104.9 0.688 1500 -98.8 0.702 1400 -93.4 0.720 1300 -88.0 0.735 1200 -82.3 0.749 1100 -76.6 0.771 1000 -71.0 0.788 900 -64.9 0.810 800 -58.1 0.832 700 -50.8 0.858 600 -43.1 0.882 500 -35.1 0.907 400 phase s11 mag frequency (mhz) -117.5 3.81 -94.9 4.17 -75.9 4.24 -53.4 4.48 -32.4 4.55 -12.0 4.74 9.2 4.77 29.5 4.85 50.6 4.80 70.7 4.76 90.4 4.70 109.1 4.62 phase s21 mag -20.2 0.489 -9.9 0.482 -0.2 0.469 -59.8 0.024 10.7 0.455 21.9 0.436 33.5 0.412 -42.9 0.021 44.7 0.396 56.8 0.384 69.4 0.365 -28.2 0.015 81.5 0.352 93.6 0.33 108.4 0.302 -10.6 0.013 phase s22 mag 12.3 0.010 28.0 0.007 36.3 0.005 64.2 0.004 39.4 0.002 55.2 0.001 64.7 0.001 13.5 0.001 phase s12 mag 64.7 2.118 82.9 2.430 105.3 2.781 123.6 2.981 146.4 3.302 -128.4 0.603 2500 166.9 3.456 -173.5 3.801 -150.0 3.876 -124.6 0.604 2400 -131.6 4.193 -109.8 4.209 -90.5 4.397 -119.4 0.610 2300 phase s21 mag -98.3 0.316 -114.0 0.620 2200 -86.2 0.338 -69.4 0.374 -108.8 0.632 2100 -56.1 0.403 -43.4 0.431 95.7 0.030 -102.6 0.646 2000 -32.0 0.470 -21.6 0.493 -10.6 0.510 -96.6 0.661 1900 111.2 0.032 -0.5 0.513 8.6 0.514 -90.6 0.678 1800 17.7 0.535 132.2 0.033 phase s22 mag -85.3 0.695 1700 150.7 0.029 171.7 0.028 -166.6 0.026 -80.3 0.717 1600 -150.6 0.023 -128.7 0.021 -116.5 0.018 -75.5 0.734 1500 -91.9 0.016 -80.3 0.013 phase s12 mag phase s11 mag frequency (mhz) table 1. max2640 typical scattering parameters at v cc = +3v, t a = +25?
max2640/max2641 300mhz to 2500mhz sige ultra-low-noise amplifiers _______________________________________________________________________________________ 7 layout and power-supply bypassing a properly designed pc board is essential to any rf/microwave circuit. be sure to use controlled imped- ance lines on all high-frequency inputs and outputs. the power supply should be bypassed with decoupling capacitors located close to the device v cc pins. for long v cc lines, it may be necessary to add additional decoupling capacitors. these additional capacitors can be located further away from the device package. proper grounding of the gnd pins is essential. if the pc board uses a topside rf ground, connect it directly to all gnd pins. for a board where the ground plane is not on the component side, the best technique is to connect the gnd pin to the board with a plated through-hole close to the package. frequency (mhz) f min (db) ? opt ? opt angle r n ( ) 1500 1.02 0.43 44 12.4 1600 1.05 0.40 47 11.8 1700 1.08 0.38 50 11.3 1800 1.10 0.36 54 10.8 1900 1.14 0.32 58 10.3 2000 1.17 0.30 62 9.9 2100 1.20 0.28 66 9.4 2200 1.23 0.25 71 9.0 2300 1.27 0.22 77 8.6 2400 1.30 0.19 82 8.3 2500 1.34 0.17 91 8.0 table 3. max2640 typical noise parameters at v cc = +3v, t a = +25? table 4. max2641 typical noise parameters at v cc = +3v, t a = +25? 7.0 84 0.26 1.06 1500 7.4 77 0.29 1.01 1400 7.9 68 0.32 0.97 1300 8.3 62 0.35 0.93 1200 8.8 56 0.37 0.89 1100 9.3 50 0.40 0.85 1000 9.7 45 0.43 0.82 900 10.2 40 0.46 0.78 800 10.8 35 0.48 0.75 700 11.3 30 0.51 0.72 600 11.9 25 0.54 0.69 500 12.5 21 0.56 0.66 400 r n ( ) opt angle ? opt ? f min (db) frequency (mhz)
max2640/max2641 300mhz to 2500mhz sige ultra-low-noise amplifiers 8 _______________________________________________________________________________________ gnd rfout gnd 16 v cc 5 gnd rfin max2640 max2641 sot23-6 top view 2 34 pin configuration 6lsot.eps package outline, sot 6l body 21-0058 2 1 i package information (the package drawing(s) in this data sheet may not reflect the most current specifications. for the latest package outline info rmation, go to www.maxim-ic.com/packages .)
max2640/max2641 300mhz to 2500mhz sige ultra-low-noise amplifiers maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a maxim product. no circu it patent licenses are implied. maxim reserves the right to change the circuitry and specifications without notice at any time. 9 _____________________maxim integrated products, 120 san gabriel drive, sunnyvale, ca 94086 408-737-7600 2007 maxim integrated products is a registered trademark of maxim integrated products, inc. package outline, sot 6l body 21-0058 2 2 i package information (continued) (the package drawing(s) in this data sheet may not reflect the most current specifications. for the latest package outline info rmation, go to www.maxim-ic.com/packages .)
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