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general description the max2654/max2655/max2656 high third-orderintercept point (ip3), low-noise amplifiers (lnas) are designed for applications in gps, pcs, wll, and satel- lite phone systems. the max2654/max2655/max2656 incorporate on-chip internal output matching to 50 , eliminating the need for external matching components.a shutdown feature in the max2654/max2655 reduces operating current to 0.1?, eliminating the need for an external supply switch. the max2654 operates in the gps frequency of 1575mhz with 15.1db of gain, 1.5db noise figure, and only consumes 5.8ma. the max2655 is designed with high-input ip3 to improve operation in cellular applica- tions where the cellular power amplifier leaks into the gps receiver. the max2656 is designed for pcs phone applications with 13.5db of gain in high-gain mode and 0.8db of gain in low-gain mode (selected by a logic control) and 1.9db noise figure. the ip3 of max2655/max2656 is adjustable by a single external bias resistor (r bias ), allowing supply current to be optimized for a specific application.the max2654/max2655/max2656 operate from +2.7v to +5.5v single supply and are available in the minia- ture 6-pin sc70 package. ________________________applications gps receiversgps receivers in cell phones dcs/pcs cell phones satellite phones wireless local loop features ? low noise figure max2654: 1.5db at 1575mhzmax2655: 1.45db at 1575mhz max2656: 1.9db at 1960mhz ? high gain max2654: 15.1db at 1575mhzmax2655: 14.1db at 1575mhz max2656: 13.5db at 1960mhz ? 12.7db gain step (max2656 only) ? integrated 50 output matching ? variable ip3 set by one bias resistor(max2655/max2656 only) ? 0.1a shutdown mode (max2654/max2655 only) ? +2.7v to +5.5v single-supply operation ? ultra-small 6-pin sc70 package max2654/max2655/max2656 1575mhz/1900mhz variable-ip3 low-noise amplifiers ________________________________________________________________ maxim integrated products 1 16 5 max2654max2655 max2654 sc70-6 top view 234 v cc rfout ( ) is for max2654 only gnd gnd rfin bias (gnd) pin configuration max2655max2656 c2 3 4 6 10k cb (1) 1 25 c1 r bias v ctrl /gnd v cc = +3.0v rfout rfin l1 bias ( ) is for max2654 only typical operating circuit evaluation kit manual follows data sheet ordering information part temp. range pin- package sot top- m ark max2654 ext-t -40? to +85? 6 sc70-6 aai max2655 ext-t -40? to +85? 6 sc70-6 aaj max2656 ext-t -40? to +95? 6 sc70-6 aak part frequency l 1 ( n h ) c 1 ( p f ) c 2 ( p f ) max2654 1575 5.6 6 1.6 max2655 1575 5.6 1800 1.5 max2656 1960 4.7 1800 1.2 for price, delivery, and to place orders, please contact maxim distribution at 1-888-629-4642, or visit maxims website at www.maxim-ic.com. 19-1872; rev 1; 4/02 downloaded from: http:///
max2654/max2655/max2656 1575mhz/1900mhz variable-ip3 low-noise amplifiers 2 _______________________________________________________________________________________ absolute maximum ratings stresses beyond those listed under ?bsolute maximum ratings?may cause permanent damage to the device. these are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability. v cc to gnd .............................................................-0.3v to +6v rf input power .................................................................+5dbm continuous power dissipation (t a = +70 c) 6-pin sc70 (derate 3.1mw/ c above +70 c) ..............245mw operating temperature range ...........................-40 c to +85 c maximum junction temperature .....................................+150 c storage temperature.........................................-65 c to +150 c lead temperature (soldering, 10s) .................................+300 c dc electrical characteristics(v cc = +2.7v to +5.5v, r bias = 511 1%, t a = -40 c to +85 c. no rf signal applied. rfin is ac-coupled and terminated to 50 . rfout is unconnected. typical values are at v cc = +3v, t a = +25 c, unless otherwise noted.) (note 1) parameter conditions min typ max unit supply voltage 2.7 5.5 v t a = +25 c 5.8 8.2 v rfout = v cc t a = -40 c to +85 c 9.2 ma t a = +25 c 0.1 1 operating supply current(max2654 only) v rfout = gnd t a = -40 c to +85 c 2.1 a r bias = 511 1% 8.3 10 r bias = 698 1% 5.9 r bias = 357 1% 10.1 v rfout = v cc t a = +25 c r bias = 511 1%, t a = -40 c to +85 c 11.1 ma t a = +25 c 0.1 1 operating supply current(max2655 only) v rfout = gnd t a = -40 c to +85 c 2.2 a r bias = 511 1% 11.5 15.2 r bias = 715 1% 8.5 v rfout = gnd t a = +25 c r bias = 511 1%, t a = +85 c 13.6 ma t a = +25 c 12.3 operating supply current(max2656 only) v rfout = v cc t a = +85 c 14.6 ma input logic high at v rfout (note 2) 2 v input logic low at v rfout (note 3) 0.6 v max2654/max2655 15.6 input logic high currentat v rfout (note 4) max2656 71 a max2654/max2655 1 input logic low currentat v rfout (note 5) max2656 -24 a downloaded from: http:///
max2654/max2655/max2656 1575mhz/1900mhz variable-ip3 low-noise amplifiers ac electrical characteristics (max2654)(max2654 evaluation kit, v cc = +3.0v, p in = -30dbm, f in = 1575mhz, v rfout = v cc through a 10k resistor, t a = +25 c. typical values are at v cc = +3v, t a = +25 c, unless otherwise noted.) (note 6) parameter conditions min typ max unit operating frequency range (note 7) 1400 1700 mhz gain (note 8) 12.7 15.1 db gain variation over temperature t a = -40 c to +85 c 0.15 1 db input third-order intercept point(note 9) -7.2 dbm input 1db compression point -18 dbm noise figure (note 10) 1.5 1.8 db input return loss 9.7 db output return loss 8.4 db reverse isolation 30 db ac electrical characteristics (max2655)(max2655 evaluation kit, v cc = +3.0v, p in = -30dbm, f in = 1575mhz, v rfout = v cc through a 10k resistor, r bias = 511 1%, t a = +25 c. typical values are at v cc = +3v, t a = +25 c, unless otherwise noted.) (note 6) parameter conditions min typ max unit operating frequency range (note 7) 1400 1700 mhz gain (note 8) 12 14.1 db gain variation over temperature t a = -40 c to +85 c 0.6 1.1 db r bias = 511 1% 2.8 r bias = 698 1% 2.2 dbm input third-order intercept point(note 9) r bias = 357 1% 3.8 input 1db compression point -12.2 dbm noise figure (note 10) 1.45 1.9 db input return loss 16.1 db output return loss 15.5 db reverse isolation 32 db _______________________________________________________________________________________ 3 downloaded from: http:///
max2654/max2655/max2656 1575mhz/1900mhz variable-ip3 low-noise amplifiers ac electrical characteristics (max2656)(max2656 evaluation kit, v cc = +3v, p in = -30dbm, f in = 1960mhz, v rfout = gnd through a 12k resistor, r bias = 511 1%, t a = +25 c. typical values are at v cc = +3v, t a = +25 c, unless otherwise noted.) (note 6) parameter conditions min typ max unit operating frequency range (note 7) 1800 2000 mhz gain, high-gain mode (note 11) 12 13.5 db gain, low-gain mode (note 12) 0.8 db gain variation over temperature t a = -40 c to +85 c 0.3 1.2 db gain step 12.7 db r bias = 511 1% 1.5 r bias = 715 1% -3 input third-order intercept point(note 13) low-gain mode (note 12) 7.2 dbm high-gain mode (note 11) -7 input 1db compression point low-gain mode (note 12) -1.2 dbm high-gain mode (note 11) 1.9 2.4 noise figure (note 10) low-gain mode (note 12) 10.8 db high-gain mode (note 11) 14.4 input return loss low-gain mode (note 12) 19.3 db high-gain mode (note 11) 10.7 output return loss low-gain mode (note 12) 7.3 db high-gain mode (note 11) 28 reverse isolation low-gain mode (note 12) 25 db gain step response time 3.2 s note 1: devices are production tested at t a = +25 c. minimum and maximum values are guaranteed by design and characteriza- tion over temperature and supply voltages to 6 sigma. note 2: minimum dc voltage through a 10k resistor that sets the max2654/max2655 to operate in normal mode and max2656 in low-gain mode. note 3: maximum dc voltage through a 10k resistor that sets the max2654/max2655 to operate in shutdown mode and max2656 in high-gain mode. note 4: dc current required when v rfout is connected to v cc through a 10k resistor. note 5: dc current required when v rfout is connected to gnd through a 10k resistor. note 6: guaranteed by design and characterization to 3 sigma. note 7: the part has been characterized at the specified frequency range. operation outside of this range is possible, but not guaranteed. note 8: production tested at t a = +25 c. note 9: measured with two input tones, f 1 = 1570mhz, f 2 = 1580mhz, both at -30dbm per tone. note 10: excludes pc board losses of 0.2db for max2654/max2655 and 0.25db for max2656. note 11: high-gain mode is set up by connecting rfout to gnd through a 12k resistor. note 12: low-gain mode is set up by connecting rfout to v cc through a 12k resistor. note 13: measured with two input tones, f 1 = 1955mhz, f 2 = 1965mhz, both at -30dbm per tone. 4 ______________________________________________________________________________________ downloaded from: http:///
max2654/max2655/max2656 1575mhz/1900mhz variable-ip3 low-noise amplifiers typical operating characteristics (p in = -30dbm, input and output are terminated to 50 , v cc = +3v, high-gain and low-gain modes are applicable only to the max2656, t a = +25 c, unless otherwise noted.) 0 1 2 3 4 5 6 7 8 23456 max2654 supply current vs. supply voltage max2654 toc01 supply voltage (v) supply current (ma) t a = -40 c t a = +25 c t a = +85 c 40 45 50 55 60 -40 0 20 -20 40 60 80 max2654 input logic current vs. temperature max2654 toc05 temperature ( c) input logic current (?) input logic low at v rfout 0 64 2 8 10 1412 16 1000 1200 1400 1600 1800 2000 2200 max2654 gain vs. frequency max2654 toc07 frequency (mhz) gain (db) 1.6 2.01.8 2.2 2.8 3.02.6 2.4 3.2 1000 1200 1400 1600 1800 2000 max2654 noise figure vs. frequency max2654 toc09 frequency (mhz) noise figure (db) 0 4 6 7 8 -40 0 20 -20 40 60 80 max2654 input logic current vs. temperature max2654 toc04 temperature ( c) input logic current (?) input logic high at v rfout 10 11 1312 14 15 2.0 3.0 3.5 2.5 4.0 4.5 5.0 5.5 6.0 max2654 gain vs. supply voltage max2654 toc08 supply voltage (v) gain (db) f 0 = 1575mhz t a = +85 c t a = +25 c t a = -40 c 4 6 8 10 12 14 -40 -20 0 20 40 80 60 max2654 shutdown current vs. temperature max2654 toc02 temperature ( c) shutdown current ( a) 2 0 v cc = +6v v cc = +3v -40 0 -20 20 40 60 80 max2654 input logic voltage vs. temperature max2654 toc03 temperature ( c) input logic voltage (v) 0.5 1.0 1.5 2.0 input logic high at v rfout input logic low at v rfout _______________________________________________________________________________________ 5 -10 -9 -8 -7 -6 max2654 input ip3 vs. temperature max2654 toc06 temperature ( c) input ip3 (dbm) -40 20 40 -20 0 60 80 f 1 = 1570 mhz f 2 = 1580 mhz downloaded from: http:///
max2654/max2655/max2656 1575mhz/1900mhz variable-ip3 low-noise amplifiers -10 -8 -6 -4 -2 0 1000 1200 1400 1600 1800 2000 max2654 input/output return loss vs. frequency max2654 toc11 frequency (mhz) input/output return loss (db) 2200 input return loss output return loss -60 -45-50 -55 -40 -35 -25-30 -20 1000 1200 1400 1600 1800 2000 2200 max2654 reverse isolation vs. frequency max2654 toc12 frequency (mhz) reverse isolation (db) -14 -10-12 -8 -6 -4 -2 0 2 4 6 8 -30 -26 -22 -18 -14 -10 max2654 output power vs. input power max2654 toc13 input power (dbm) output power (dbm) -16 -6 -2 2 6 ______________________________________________________________________________________ 0 1 2 3 4 5 6 7 8 23456 max2655 supply current vs. supply voltage max2655 toc16 supply voltage (v) supply current (ma) r bias = 698 1% t a = +85 c t a = +25 c t a = -40 c 0 32 1 4 5 6 7 8 9 10 23456 max2655 supply current vs. supply voltage max2655 toc17 supply voltage (v) supply current (ma) r bias = 511 1% t a = +85 c t a = +25 c t a = -40 c -22 -21 -19-20 -18 -17 -40 0 -20 20 40 60 80 max2654 p 1db vs. temperature max2654 toc14 temperature ( c) p 1db (dbm) f in = 1575mhz 0 42 86 1210 14 max2655 supply current vs. supply voltage max2655 toc18 supply voltage (v) supply current (ma) 23456 r bias = 357 1% t a = +85 c t a = +25 c t a = -40 c typical operating characteristics (continued) (p in = -30dbm, input and output are terminated to 50 , v cc = +3v, high-gain and low-gain modes are applicable only to the max2656, t a = +25 c, unless otherwise noted.) 1.0 1.41.2 1.81.6 2.22.0 2.4 -40 0 20 -20 40 60 80 max2654 noise figure vs. temperature max2654 toc10 temperature ( c) noise figure (db) f in = 1575mhz -100 -90 -80 -70 -50-60 -40 -20-30 -10 0 0 1.0 2.0 3.0 4.0 max2654 shutdown time max2655 toc15 time ( s) output power (dbm) 2.8 s us downloaded from: http:///
max2654/max2655/max2656 1575mhz/1900mhz variable-ip3 low-noise amplifiers max2655 input ip3 vs. r bias max2655 toc23 -10 -4-6 -8 0 -2 6 84 2 10 input ip3 (dbm) 200 600 800 400 1000 1200 1400 1600 temperature ( c) t a = +85 c p in = -30dbm f 1 = 1570mhz f 2 = 1580mhz t a = +25 c t a = -40 c typical operating characteristics (continued) (p in = -30dbm, input and output are terminated to 50 , v cc = +3v, high-gain and low-gain modes are applicable only to the max2656, t a = +25 c, unless otherwise noted.) -40 0 20 -20 40 60 80 max2655 input logic voltage vs. temperature max2655 toc21 temperature ( c) input logic voltage (v) 0.5 1.0 1.5 2.0 input logic high at v rfout input logic low at v rfout 10 11 1312 14 15 2.0 3.0 3.5 2.5 4.0 4.5 5.0 5.5 6.0 max2655 toc26 supply voltage (v) gain (db) t a = -40 c t a = +85 c t a = +25 c f in = 1575mhz r bias = 511 ?% max2655 gain vs. supply voltage 1.4 1.81.6 2.22.0 2.62.4 2.8 3.23.0 3.4 1000 1200 1400 1600 1800 2000 max2655 noise figure vs. frequency max2655 toc27 frequency (mhz) noise figure (db) r bias = 357 1% r bias = 511 1% r bias = 698 1% 8 1110 9 1312 1716 15 14 18 200 400 600 800 1000 1200 1400 1600 max2655 gain vs. r bias max2655 toc25 r bias ( ) gain (db) f in = 1575mhz t a = -40 c t a = +85 c t a = +25 c max2655 input logic current vs. temperature max2655 toc22 4 5 6 98 7 10 input logic current (?) -40 0 20 -20 40 60 80 temperature ( c) input logic high at v rfout input logic low at v rfout 0 64 2 8 10 12 14 16 1000 1400 1600 1200 1800 2000 2200 max2655 gain vs. frequency max2655 toc24 frequency (mhz) gain (db) r bias = 511 1% r bias = 357 1% r bias = 698 1% _______________________________________________________________________________________ 7 max2655 supply current vs. r bias max2655 toc19 0 2 64 12 1410 8 16 supply current (ma) 200 600 800 400 1000 1200 1400 1600 r bias ( ) t a = -40 c t a = +25 c t a = +85 c 2016 24 28 max2655 shutdown current vs. temperature max2655 toc20 temperature ( c) shutdown current (na) 0 4 8 12 -40 0 20 -20 40 60 80 v cc = +6v v cc = +3v downloaded from: http:///
max2654/max2655/max2656 1575mhz/1900mhz variable-ip3 low-noise amplifiers 8 _______________________________________________________________________________________ -100 -90 -80 -70 -50-60 -40 -20-30 -10 0 0 2.0 1.0 4.0 3.0 6.0 7.0 5.0 8.0 max2655 shutdown time max2655 toc31 time (us) output power (dbm) 5.8 s typical operating characteristics (continued) (p in = -30dbm, input and output are terminated to 50 , v cc = +3v, high-gain and low-gain modes are applicable only to the max2656, t a = +25 c, unless otherwise noted.) -4-8 -12-16 0 4 8 12 -30 -22 -18 -26 -14 -10 -6 -2 2 max2655 output power vs. input power max2655 toc32 input power (dbm) output power (dbm) f in = 1575mhz r bias = 698 1% r bias = 357 1% r bias = 511 1% -18 -15-16 -17 -13-14 -9 -10-11 -12 -8 200 400 600 800 1000 1200 1400 1600 max2655 p 1db vs. r bias max2655 toc33 r bias ( ) p 1db (dbm) f in = 1575mhz t a = -40 c t a = +85 c t a = +25 c 0 42 6 8 10 12 14 23456 max2656 supply current vs. supply voltage max2654 toc35 supply voltage (v) supply current (ma) r bias = 511 1% high-gain mode t a = +85 c t a = +25 c t a = -40 c 0 64 2 8 10 12 14 16 18 23456 max2656 supply current vs. supply voltage max2654 toc36 supply voltage (v) supply current (ma) t a = +85 c t a = +25 c t a = -40 c r bias = 392 1% high-gain mode 0 32 1 4 5 6 7 8 9 10 23456 max2656 supply current vs. supply voltage max2654 toc34 supply voltage (v) supply current (ma) r bias = 715 1% high-gain mode t a = +85 c t a = +25 c t a = -40 c -24 -20 -16 -12 -8 -4 0 1000 1200 1400 1600 1800 2000 max2655 input/output return loss vs. frequency max2655 toc29 frequency (mhz) input/output return loss (db) 2200 input return loss output return loss max2655 reverse isolation vs. frequency max2655 toc30 -60 -55 -45-50 -30 -25-35 -40 -20 reverse isolation (db) 1000 1400 1600 1200 1800 2000 2200 frequency (mhz) 1.0 1.2 1.61.4 1.8 2.0 -40 0 -20 20 40 60 80 max2655 noise figure vs. temperature max2655 toc28 temperature ( c) noise figure (db) f in = 1575mhz r bias = 511 1% downloaded from: http:///
max2654/max2655/max2656 1575mhz/1900mhz variable-ip3 low-noise amplifiers _______________________________________________________________________________________ 9 0 84 1612 2420 200 600 800 400 1000 1200 1400 1600 max2656 supply current vs. r bias max2654 toc40 r bias ( ) supply current (ma) high-gain mode t a = +85 c t a = -40 c t a = +25 c typical operating characteristics (continued) (p in = -30dbm, input and output are terminated to 50 , v cc = +3v, high-gain and low-gain modes are applicable only to the max2656, t a = +25 c, unless otherwise noted.) 0 84 1612 2420 200 600 800 400 1000 1200 1400 1600 max2656 supply current vs. r bias max2654 toc41 r bias ( ) supply current (ma) low-gain mode t a = +85 c t a = -40 c t a = +25 c 2.0 1.5 1.0 0.5 -40 20 -20 04 0 6 0 max2656 input logic voltage vs. temperature max2654 toc42 temperature ( c) input logic voltage (v) 80 i nput logic high at v rfout input logic low at v rfout -15 -11 -9 -13 -3-7 -5 3 -1 1 5 200 600 800 400 1000 1200 1400 1600 max2656 input ip3 vs. r bias max2654 toc44 r bias ( ) input ip3 (dbm) t a = -40 c t a = +85 c f 1 = 1955mhz f 2 = 1965mhz p in = -20dbm high-gain mode t a = +25 c -6 4 10 6 8 12 0 -4 -2 2 200 600 800 400 1000 1200 1400 1600 max2656 input ip3 vs. r bias max2654 toc45 r bias ( ) input ip3 (dbm) f 1 = 1955mhz f 2 = 1965mhz p in = -20dbm low-gain mode t a = +25 c t a = +85 c t a = -40 c 10 0 -10-20 -30 -40 20 -20 04 0 6 0 max2656 input logic current vs. temperature max2654 toc43 temperature (?) input logic current ( a) 80 input logic low at v rfout i nput logic high at v rfout 0 10 12 14 16 2 4 6 8 23456 max2656 supply current vs. supply voltage max2654 toc38 supply voltage (v) supply current (ma) t a = +85 c t a = +25 c t a = -40 c r bias = 511 1% low-gain mode 0 1614 18 20 86 10 12 2 4 23456 max2656 supply current vs. supply voltage max2654 toc39 supply voltage (v) supply current (ma) r bias = 392 1% low-gain mode t a = +25 c t a = +85 c t a = -40 c 0 43 2 1 5 6 7 8 9 10 11 12 23456 max2656 supply current vs. supply voltage max2654 toc37 supply voltage (v) supply current (ma) t a = +85 c t a = +25 c t a = -40 c r bias = 715 1% low-gain mode downloaded from: http:///
max2654/max2655/max2656 1575mhz/1900mhz variable-ip3 low-noise amplifiers 10 ______________________________________________________________________________________ 0 16 1412 10 8 64 2 1000 1600 1200 1400 2000 1800 2200 max2656 gain vs. frequency max2654 toc46 frequency (mhz) gain (db) high-gain mode r bias = 392 1% r bias = 698 1% r bias = 511 1% -4 4 32 1 0 -1 -2-3 1000 1600 1800 1200 1400 2000 2200 max2656 gain vs. frequency max2654 toc47 frequency (mhz) gain (db) low-gain mode r bias = 392 1% r bias = 715 1% r bias = 511 1% 6 14 1715 16 1813 8 11 9 10 12 7 200 600 800 400 1000 1200 1400 1600 max2656 gain vs. r bias max2654 toc48 r bias ( ) gain (db) f in = 1960mhz high-gain mode t a = +25 c t a = +85 c t a = -40 c -2 2 3 4 -1 0 1 200 600 800 400 1000 1200 1400 1600 max2656 gain vs. r bias max2654 toc49 r bias ( ) gain (db) f in = 1960mhz low-gain mode t a = +25 c t a = +85 c t a = -40 c 0 1 2 3 2.5 4.0 4.5 3.0 3.5 5.0 5.5 6.0 max2656 gain vs. supply voltage max2654 toc50 supply voltage (v) gain (db) t a = +85? t a = +25? t a = -40? r bias = 511 ?% f in = 1960mhz low-gain mode 14.0 14.5 15.0 15.5 16.0 2.5 4.0 4.5 3.0 3.5 5.0 5.5 6.0 max2656 gain vs. supply voltage max2654 toc51 supply voltage (v) gain (db) r bias = 511 ?% f 1 = 1960mhz high-gain mode t a = +25 c t a = +85 c t a = -40 c 1.4 1.6 2.01.8 2.2 2.4 1500 1700 1800 1600 1900 2000 2100 2200 2300 max2656 noise figure vs. frequency max2654 toc52 frequency ( mhz ) noise figure (db) r bias = 715 1% r bias = 511 1% r bias = 392 1% 2.22.0 2.41.8 1.6 1.4 1.2 1.0 -40 20 -20 04 0 6 0 8 0 max2656 noise figure vs. temperature max2654 toc53 temperature ( c ) noise figure (db) f 1 = 1960mhz r bias = 511 1% 0 -2-4 -6-8 -10-12 -14 -16 -18 -20 -22 -24 1000 1600 1800 1200 1400 2000 2200 max2656 input/output return loss vs. frequency max2654 toc54 frequency ( mhz ) input/output return loss (db) low-gain mode input return loss output return loss typical operating characteristics (continued) (p in = -30dbm, input and output are terminated to 50 , v cc = +3v, high-gain and low-gain modes are applicable only to the max2656, t a = +25 c, unless otherwise noted.) downloaded from: http:///
max2654/max2655/max2656 1575mhz/1900mhz variable-ip3 low-noise amplifiers ______________________________________________________________________________________ 11 0 -2 -4-6 -8 -10-12 -14 1000 1600 1800 1200 1400 2000 2200 max2656 input/output return loss vs. frequency max2654 toc55 frequency (mhz) input/output return loss (db) high-gain mode input return loss output return loss -45-50 -55 -60 -25 -20-30 -35 -40 1000 1600 1800 1200 1400 2000 2200 max2656 reverse isolation vs. frequency max2654 toc56 frequency (mhz) reverse isolation (db) high-gain mode low-gain mode -40 -30-35 -20-25 -15 -10 0 2.0 1.0 3.0 4.0 max2656 gain step time from low to high max2654 toc57 time ( s) output power (dbm) 2.0 s -40 -30-35 -20-25 -15 -10 0 2.0 1.0 3.0 4.0 max2656 gain step time from high to low max2654 toc58 time ( s) output power (dbm) 2.0 s -20 10 86 4 2 0 -2 -4-6 -8 -10 -12 -14-18 -16 -30 -15 -10 -25 -20 -5 0 max2656 output power vs. input power max2654 toc59 input power (dbm) output power (dbm) f in = 1960mhz high-gain mode r bias = 715 ?% r bias = 511 ?% r bias = 392 ?% -30 2 -2-6 -10 -14 -18-22 -26 -30 -15 -10 -25 -20 -5 0 max2656 output power vs. input power max2654 toc60 input power (dbm) output power (dbm) f in = 1960mhz low-gain mode r bias = 715 1% r bias = 511 1% r bias = 392 1% typical operating characteristics (continued) (p in = -30dbm, input and output are terminated to 50 , v cc = +3v, high-gain and low-gain modes are applicable only to the max2656, t a = +25 c, unless otherwise noted.) -12 2 40 -4 -2-6 -10 -8 200 600 800 400 1000 1200 1400 1600 max2656 p 1db vs. r bias max2654 toc62 r bias ( ) p 1db (dbm) t a = +25 c t a = -40 c t a = +85 c f in = 1960mhz high-gain mode -10 2 40 -4 -2-6 -8 200 600 800 400 1000 1200 1400 1600 max2656 p 1db vs. r bias max2654 toc61 r bias ( ) p 1db (dbm) t a = +25 c t a = +40 c f in = 1960mhz low-gain mode t a = +85 c downloaded from: http:///
max2654/max2655/max2656 1575mhz/1900mhz variable-ip3 low-noise amplifiers 12 ______________________________________________________________________________________ detailed description the max2654/max2655/max2656 are low-noise ampli-fiers designed for applications in gps receivers, satel- lite and pcs phones. the max2655/max2656 feature variable ip3s, adjusted by a single external bias resis- tor. another feature of the max2654/max2655 is a power shutdown control mode, eliminating the need for an external supply switch. the max2656 features a high- and low-gain control mode selected by an exter- nal logic control. input and output ports the max2654/max2655/max2656 incorporate on-chipmatching networks to 50 at the output ports, eliminat- ing the need for external matching components. (formax2655, a shunt inductor is recommended for best output return loss. refer to the max2655 ev kit schematic.) the max2654/max2655/max2656 require simple matching networks at the input ports. the values of these matching components are recommended in the typical operating circuit. variable ip3 the ip3 of max2655 and max2656 is adjusted throughan external resistor (r bias ). tables 1 and 2 summarize the values of r bias for different ip3s for max2655 and max2656. gain-step control (max2656) the dc bias voltage at rfout of the max2656 servesas a gain-step control input. when the applied dc volt- age at rfout through a 10k resistor is less than +0.6v, the device is in high-gain mode. when theapplied dc voltage is greater than +2.0v, the device gain is attenuated by 13db. a standard logic output can be applied as shown in the typical operating circuit . shutdown-enable (max2654/max2655) the dc bias voltage at rfout of the max2654/max2655 serves as a shutdown enable input. when the applied dc voltage at rfout through a 10k resistor is less than +0.6v, the device is in shutdown mode.when the dc voltage is greater than +2v, the device is enabled. pin description table 1. r bias vs. ip3 for max2655 r bias ( ) ip3 (dbm) i cc (ma) 698 2.2 5.8 357 3.8 10.1 table 2. r bias vs. ip3 for max2656 r bias ( ) ip3 (dbm) i cc (ma) 715 -3 8.5 511 1.5 11.5 pin max2654 max2655/ max2656 name description 1 CCC gnd g r ound . c onnect to the p c b oar d g r ound p l ane thr oug h a 0.017i n x 0.035i n l i ne. 2, 5 2, 5 gnd ground. connect to the p c b oar d ground plane with as low an inductance path as possible. CCC 1 bias bias control. connect a resistor r bias from bias to gnd. r bias sets ip3 and supply current. 3 3 rfin amplifier input. requires a dc-blocking capacitor and external matching components. 44v cc supply voltage. bypass to ground with an appropriate capacitor as close to the ic aspossible. refer to max2654/max2655/max2656 ev kits for capacitor values. 6 6 rfout rf output. incorporates an internal dc-blocking capacitor. rfout is internallymatched to 50 . dc bias on this pin selects gain mode (max2656) or shutdown mode (max2654/max2655) (see applications information ). downloaded from: http:///
max2654/max2655/max2656 1575mhz/1900mhz variable-ip3 low-noise amplifiers ______________________________________________________________________________________ 13 applications information input matching for optimum performance, input matching is required.the max2654/max2655/max2656 require a simple lc matching network. the typical operating circuit shows the recommended input matching networks. these val-ues are optimized for best simultaneous gain, noise fig- ure, and return loss performance. s-parameter data can be found on the maxim website at www.maxim-ic.com. layout issues a properly designed pc board is essential to any rf-microwave circuit. use controlled impedance lines on all high-frequency inputs and outputs. bypass v cc with decoupling capacitors located close to the device. for long v cc lines, it may be necessary to add decoupling capacitors. locate these additional capacitors furtheraway 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 layer, connect the gnd pins to the board with a multiple vias close to the package. for max2654, connect pin1 to the pc board ground plane through a 0.017in x 0.035in line. chip information transistor count: 135(same for max2654, max2655, max2656) downloaded from: http:///
max2654/max2655/max2656 1575mhz/1900mhz variable-ip3 low-noise amplifiers 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. 14 ____________________maxim integrated products, 120 san gabriel drive, sunnyvale, ca 94086 408-737-7600 ? 2000 maxim integrated products printed usa is a registered trademark of maxim integrated products. sc70, 6l.eps 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 .) downloaded from: http:///

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