general description the max2700/max2701 are highly integrated direct downconversion (zero-if) receivers designed for wide- band wireless local loop (wll) systems operating in the 1.8ghz to 2.5ghz band. the max2700/max2701s zero-if architecture eliminates the need for if down- conversion stages and the use of an if saw filter. this reduces the overall receiver cost by reducing the com- ponent count and required board space. the max2700/max2701 have three main blocks: low- noise amplifier (lna), quadrature downconverter, and baseband variable gain amplifiers (vgas). the lna is a single-ended amplifier with selectable gain and shut- down options. it provides a high input third-order inter- cept point (ip3), which reduces cross-modulation and gain compression due to high-level rf interference. the quadrature downconverter section consists of two highly linear double-balanced mixers driven by an external local oscillator (lo) with a selectable lo dou- bler. the double-balanced mixers are optimized to pro- vide high input ip3 and minimum added noise. the mixers?high input second-order intercept point (iip2) helps minimize receiver desensitization due to high- level am-modulated interferers. the two baseband vgas in each channel provide 80db of total maximum gain and greater than 60db of gain control. the first agc amplifier is optimized for low noise, low power dissipation, and high linearity over the entire gain range to ensure high gain compression per- formance. an external lowpass filter between baseband vgas provides the required channel selectivity at the adjacent channel. an integrated gain offset correction loop circuit provides <0.3db amplitude mismatch between the i and q channels. the max2700/max2701 operate from a single +2.7v to +3.3v power supply, drawing only 165ma of supply current and 20? in shutdown mode. both devices are available in small 48-pin tqfp packages with exposed paddle (ep) for optimum high-frequency performance. ________________________applications wireless local loop wideband direct-sequence spread-spectrum systems two-way mmds wideband 2.4ghz ism radios digital microwave radios features input frequency range 1.8ghz to 2.1ghz (max2700) 2.1ghz to 2.5ghz (max2701) cascaded performance at 1960 mhz 3.5db noise figure -7.5dbm input ip3 at maximum gain lna with selectable gain and shutdown option high linearity direct i/q downconverter wideband lo quadrature generator 3db baseband channel bandwidth of at least 56mhz variable gain baseband amplifiers with >60db control range baseband gain offset correction loop +2.7v to +3.3v single-supply operation small 48-pin tqfp-ep package max2700/max2701 1.8ghz to 2.5ghz direct downconversion receivers ________________________________________________________________ maxim integrated products 1 iin2- dci2+ dci2- iout2 gnd rfin- rfin+ v cc qout2 dcq2- dcq2+ qin2- cext- cext+ v cc x2_en gnd lnain gnd gnd gain_set shdn agc v cc 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 gnd lnaout gnd mix_q v cc qin1+ qin1- dcq1+ dcq1- qout1 mixtnk qin2+ v cc lo gnd mix_i gnd iin1+ iin1- dci1+ dci1- iout1 v cc iin2+ tqfp-ep max2700 max2701 top view pin configuration 19-1667; rev 0; 4/00 for free samples and the latest literature, visit www.maxim-ic.com or phone 1-800-998-8800. for small orders, phone 1-800-835-8769. ordering information part temp. range pin-package max2700 ecm -40 c to 85 c 48 tqfp-ep max2701 ecm -40 c to 85 c 48 tqfp-ep
max2700/max2701 1.8ghz to 2.5ghz direct downconversion receivers 2 _______________________________________________________________________________________ absolute maximum ratings dc electrical characteristics (max2700/max2701 ev kit (figure 3), v cc = +2.7v to +3.3v, shdn = gain_set = v cc , x2_en = gnd, v agc = 1.25v, cext+ con- nected to cext-; no rf input signals applied; rfin, lnain, lo inputs are terminated with 50 ? , lnaout connected to v cc through a 10nh inductor; mix_i, mix_q, qin1+, qin1-, qout1, iin1+, iin1-, iout1, qin2+, qin2-, qout2, iin2+, iin2-, iout2 pins are unconnected; t a = -40 c to +85 c, unless otherwise noted. typical values are at v cc = +3.0v, t a = +25 c.) 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 rf signals p rfin , p lnain , p lo .....................................................+15dbm baseband signals iin1+ to iin1-, iin2+ to iin2-, qin1+ to qin1-, qin2+ to qin2- ......................................2v input voltages agc, gain_set, shdn , x2_en , cext_, rfin_, lo, lnain, iin_ _, qin_ _ , dci_ _ , dcq_ _ to gnd ..........-0.3v to (v cc + 0.3v) input current agc ..50ma all digital inputs ..10ma continuous power dissipation (t a = +70 c) 48-pin tqfp-ep (derate 27mw/ c above +70 c) .....2000mw operating temperature range ...........................-40 c to +85 c storage temperature range .............................-65 c to +150 c junction temperature ......................................................+150 c lead temperature (soldering, 10s) .................................+300 c parameters conditions min typ max units supply supply voltage 2.7 3.3 v max2700 165 215 lna enabled max2701 167 220 max2700 155 200 t a = +25 c lna disabled max2701 156 205 max2700 230 lna enabled max2701 235 max2700 210 operating supply current t a = -40 c to +85 c lna disabled max2701 215 ma shutdown supply current shdn = gnd, v agc = 0.5v 20 100 a control inputs/outputs input logic voltage high 2v input logic voltage low 0.6 v shdn , x2_en , gain_set -1 0.5 agc, +0.5 < v agc < +2.0v -22 12 input bias current agc, v agc = 0.5v, shdn = gnd -2 2 a mix_i, mix_q 1.2 iout1, qout1 1.1 dc output voltage iout2, qout2 1.25 v
max2700/max2701 1.8ghz to 2.5ghz direct downconversion receivers _______________________________________________________________________________________ 3 ac electrical characteristics (max2700/max2701 ev kit (figure 3), v cc = +3.0v, t a = +25 c, shdn = gain_set = v cc , x2_en = gnd, cext+ connected to cext-, p lo = -13dbm, f lo = 980mhz (max2700) and 1200mhz (max2701), p lnain = -30dbm, p rfin = -25dbm, lnain and rfin (single-ended input to balun) driven from 50 ? source, lnaout terminated into load; mix_i, mix_q ac-coupled to 2k ? load; iin1+, qin1+, iin2+, qin2+ driven from 1.1k ? ac-coupled source; iout1, qout1 ac-coupled to 2k ? ; iout2, qout2 ac-coupled to 100 ? ; input to vgas, 20mvp-p at 1mhz tone, set v agc = 1.25v, unless otherwise noted.) parameters conditions min typ max units lna stage max2700 1800 2100 operating frequency range (note 1) max2701 2100 2500 mhz gain_set = v cc 13.5 17.1 19.5 max2700, f lnain = 1960mhz gain_set = gnd -7.5 -1.9 2 gain_set = v cc 13 20 t a = -40 c to 85 c gain_set = gnd -8 2.5 gain_set = v cc 13 16.5 18.5 max2701, f lnain = 2400mhz gain_set = gnd -6 -1.8 0.5 gain_set = v cc 12.5 19 power gain (note 2) t a = -40 c to 85 c gain_set = gnd -6.5 1.0 db gain_set = v cc 2.0 max2700, f lnain = 1960mhz gain_set = gnd 15.8 gain_set = v cc 2.3 noise figure max2701, f lnain = 2400mhz gain_set = gnd 16.7 db gain_set = v cc +2.7 max2700, f lnain = 1960mhz gain_set = gnd +5.1 gain_set = v cc +3.8 input third-order intercept (note 3) max2701, f lnain = 2400mhz gain_set = gnd +4.3 dbm reverse isolation 1800mhz to 2500mhz, gain_set = v cc or gnd 28 db lnain to lo, f lnain = 1800mhz to 2500mhz 30 isolation lnaout to rfin, f lnain = 1800 mhz to 2500 mhz 44 db m ax2700 gain _s et = v c c 1.1 gain_set = gnd 1.8 m ax2701 gain _s et = v c c 1.3 at lna input, with external matching circuit at lnain gain_set = gnd 2.1 m ax2700 gain _s et = v c c 1.7 gain_set = gnd 1.6 m ax2701 gain _s et = v c c 1.2 vswr at lna output, with external matching circuit at lnaout gain_set = gnd 1.4 ? mixer stage ( d i ffer enti al rf i np ut to m i xer i/q outp uts w i th exter nal b al un and m atchi ng ci r cui t to 50 ? ) max2700 1800 2100 frequency range (notes 1, 2) max2701 2100 2500 mhz max2700, f rfin = 1960 mhz 16 19.3 21.5 voltage gain max2701, f rfin = 2400 mhz 14.5 18.1 20 db max2700, f rfin = 1960mhz 11.0 dsb noise figure max2701, f rfin = 2400mhz 12.8 db
max2700/max2701 1.8ghz to 2.5ghz direct downconversion receivers 4 _______________________________________________________________________________________ parameters conditions min typ max units max2700, f lo = 980mhz +6.3 input third-order intercept (note 4) max2701, f lo = 1200mhz +6.5 dbm max2700 +28.3 input second-order intercept (note 5) max2701 +38 dbm max2700 1.5 vswr w i th 50 ? exter nal m atchi ng at rfin + / rfin - max2701 1.2 f rfin = 1800mhz to 2100mhz 35 max2700 f rfin 20mhz 28 f rfin = 2100mhz to 2500mhz 22 isolation (rfin to mix_i/q) max2701 f rfin 20mhz 12 db max2700, f rfin = 1800mhz to 2100mhz 38 isolation (rfin to lo) max2701, f rfin = 2100mhz to 2500mhz 45 db f lo = 900mhz to 1050mhz, x2_en = gnd 49 f lo = 900mhz to 1050mhz, x2_en = gnd, isolation at 2 x f lo 43 max2700 f lo = 1800mhz to 2100mhz, x2_en = v cc 33 db f lo = 1050mhz to 1250mhz, x2_en = gnd 60 f lo = 1050mhz to 1250mhz, x2_en = gnd, isolation at 2 x f lo 44 isolation (lo to rfin) max2701 f lo = 2100mhz to 2500mhz, x2_en = v cc 70 mixer spurious suppression 2 x lo - rf (note 6) 60 dbc -1db bandwidth (note 2) 37 69 baseband bandwidth mix_i/q -3db bandwidth 170 mhz baseband frequency = 125khz 0.1 0.7 gain mismatch ? g v (i-q) (between mixer i and q channels) up to -1db baseband width (note 2) 0 0.7 db ac electrical characteristics (continued) (max2700/max2701 ev kit (figure 3), v cc = +3.0v, t a = +25 c, shdn = gain_set = v cc , x2_en = gnd, cext+ connected to cext-, p lo = -13dbm, f lo = 980mhz (max2700) and 1200mhz (max2701), p lnain = -30dbm, p rfin = -25dbm, lnain and rfin (single-ended input to balun) driven from 50 ? source, lnaout terminated into load; mix_i, mix_q ac-coupled to 2k ? load; iin1+, qin1+, iin2+, qin2+ driven from 1.1k ? ac-coupled source; iout1, qout1 ac-coupled to 2k ? ; iout2, qout2 ac-coupled to 100 ? ; input to vgas, 20mvp-p at 1mhz tone, set v agc = 1.25v, unless otherwise noted.)
max2700/max2701 1.8ghz to 2.5ghz direct downconversion receivers _______________________________________________________________________________________ 5 parameters conditions min typ max units group delay t gd , rfin to mix_i/q, frequency up to -1db baseband width 1.8 ns differential group delay (note 2) ? t gd (between mixer i and q channels) 1 ns output impedance z out , mix_i, mix_q, frequency up to -1db baseband width 1.4 ? mixer output level (note 2) mix_i, mix_q, baseband output at -1db compression point 1.4 2.1 vp-p lo doubler, lo buffer, quadrature generator max2700 900 1050 x2_en = gnd max2701 1050 1250 max2700 1800 2100 lo frequency range (notes 1, 2) x2_en = v cc max2701 2100 2500 mhz lo input power (note 7) x2_en = v cc or gnd -16 -13 -10 dbm f lo = 900mhz to 1050mhz, x2_en = gnd 2.0 max2700 f lo = 1800mhz to 2100mhz, x2_en = v cc 1.8 f lo = 1050mhz to 1250mhz, x2_en = gnd 1.7 lo vswr max2701 f lo = 2100mhz to 2500mhz, x2_en = v cc 2.0 ? quadrature error ?? ? , mix_i to mix_q 1.5 4.5 degrees baseband stage 1 (iin1 to iout1, qin1 to qout1 ) -1db bandwidth (note 2) 14 26 channel bandwidth -3db bandwidth 56 mhz input impedance iin1+, iin1-, qin1+, qin1-, single-ended 1.9 k ? input impedance mismatch between iin1+ and qin1+ 4 ? v agc = 0.5v -1.5 2.2 6 voltage gain (g v ) v agc = 2.0v 37 40 42 db voltage gain mismatch mismatch between iin1 to iout1 and qin1 to qout1, 0.5v < v agc < 2 v 0.2 db vga1 gain slope guaranteed monotonic over 0.5v |