_______________________________________________________________ maxim integrated products 1 for pricing, delivery, and ordering information, please contact maxim direct at 1-888-629-4642, or visit maxims website at www.maxim-ic.com. gps/gnss lnas with antenna switch and bias MAX2674/max2676 19-5670; rev 0; 12/10 typical operating circuit general description the MAX2674/max2676 are ultra-small, high-ip3, low- noise amplifiers (lnas) designed for gps l1, galileo, and glonass applications. designed in maxims advanced sige process, the devices are also equipped with an autosensing feature for applications that enable the use of external antennas. these high-performance lnas provide high gain and an ultra-low noise figure while optimizing the input-referred 2db compression point and 3rd-order intercept point. the ultra-small size is ideal for front-end modules and receiver applications in cellular phones, smartphones, pdas, pnds, or other custom gnss applications. the MAX2674/max2676 operate from a 1.6v to 3.6v single supply. the MAX2674 is optimized for high gain, while the max2676 is optimized for high linearity. a shutdown feature is present in both devices reducing the supply current to less than 10 f a. the antenna port automati - cally senses when an external antenna is connected, eliminating the need for additional control circuitry while also providing improved short-circuit protection. the MAX2674/max2676 are available in an ultra-small, rohs-compliant 0.86mm x 1.26mm x 0.64mm wafer- level package (wlp). features s eliminate discrete antenna sensing, switching, and bias networks autodetect antenna connection provide antenna bias short-circuit protection s wide 1.6v to 3.6v supply voltage range s ultra-small footprint (0.86mm x 1.26mm) wlp package s for applications without antenna port, use pin- compatible 4-bump max2686/max2687/max2688 lna applications front-end saw modules receiver modules cellular and smartphones avionics and military telematics (asset tracking and management) personal navigation devices (pnds) recreational, marine navigation ordering information + denotes a lead(pb)-free/rohs-compliant package. t = tape and reel. evaluation kit available part temp range pin-package MAX2674 ewt+t -40 n c to +85 n c 6 wlp max2676 ewt+t -40 n c to +85 n c 6 wlp MAX2674 max2676 v cc 1.6v to 3.6v rfin ant bias active antenna rfout/shdn rfout 39pf 25ki 100pf shdn optional gndac gnddc ant a1 a2 b1 b2 10pf 100pf optional 88nh c1 c2
gps/gnss lnas with antenna switch and bias MAX2674/max2676 2 stresses beyond those listed under absolute 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 +3.9v other pins to gnd_ .................................. -0.3v to (v cc + 0.3v) maximum input power ..................................................... +5dbm continuous power dissipation (t a = +70 n c) wlp (derate 10.5mw/ n c above +70 n c) ...................... 840mw operating temperature range .......................... -40 n c to +85 n c junction temperature ..................................................... +150 n c storage temperature range ............................ -65 n c to +160 n c soldering temperature (reflow, note 1) .......................... +260 n c dc electrical characteristics (v cc = 1.6v to 3.6v, no rf signal applied, t a = -40 n c to +85 n c. typical values are at v cc = 3.3v, t a = +25 n c, unless otherwise noted.) (note 2) absolute maximum ratings caution! esd sensitive device note 1: refer to application note 1891: wafer-level packaging (wlp) and its applications . ac electrical characteristics (v cc = 1.6v to 3.6v, f rfin = 1575.42mhz, t a = -40 n c to +85 n c. typical values are at v cc = 3.3v, t a = +25 n c, unless otherwise noted.) (note 2) parameter conditions min typ max units supply voltage 1.6 3.3 3.6 v supply current 4.5 7 ma shutdown current v shdn = 0v 10 f a shutdown logic-low 0.45 v shutdown logic-high 1.2 v ant sense threshold causes autosense to switch to ant 75 200 850 f a ant current limit ant connected to gnd_ 20 30 45 ma ant port supply drop voltage drop from v cc with 10ma load on ant 75 mv parameter conditions min typ max units minimum rf input frequency 1575.42 mhz maximum rf input frequency 1610 mhz power gain MAX2674 13 18 db max2676 11 15 noise figure 0.75 db in-band input ip3 MAX2674, rf input = f o q 2.5mhz at -40dbm each -2 dbm max2676, rf input = f o q 2.5mhz at -40dbm each +5 ant in-band input ip3 rf input = f o q 2.5mhz at -25dbm each +30 dbm
gps/gnss lnas with antenna switch and bias MAX2674/max2676 3 ac electrical characteristics ( continued ) (v cc = 1.6v to 3.6v, f rfin = 1575.42mhz, t a = -40 n c to +85 n c. typical values are at v cc = 3.3v, t a = +25 n c, unless otherwise noted.) (note 2) note 2: guaranteed by test at t a = +25 n c, guaranteed by design and characterization at t a = -40 n c and t a = +85 n c. typical operating characteristics (MAX2674/max2676 ev kit. typical values are at v cc = 3.3v, t a = +25 n c, unless otherwise specified.) parameter conditions min typ max units out-of-band input ip3 MAX2674, rf input = 1713.42mhz, -17dbm and 1851.42mhz, -59dbm 3 dbm max2676, rf input = 1713.42mhz, -17dbm and 1851.42mhz, -59dbm 5 input p2db MAX2674, f rfin = 1580.42mhz -7 dbm max2676, f rfin = 1580.42mhz -4 input return loss 15 db output return loss 15 db reverse isolation 45 db ant insertion loss 1.5 db rfin to ant isolation 45 db MAX2674 input return loss vs. frequency MAX2674 toc01 frequency (mhz) |s11| (db) 2250 2000 1500 1750 1000 1250 750 -40 -35 -30 -25 -20 -15 -10 -5 0 -45 500 2500 lna antenna MAX2674 gain vs. frequency MAX2674 toc02 frequency (mhz) gain (db) 2250 2000 750 1000 1250 1500 1750 -10 -5 0 5 10 15 20 25 -15 500 2500 lna antenna MAX2674 reverse isolation vs. frequency MAX2674 toc03 frequency (mhz) |s12| (db) -60 -50 -40 -30 -20 -10 0 -70 2250 2000 750 1000 1250 1500 1750 500 2500 lna antenna
gps/gnss lnas with antenna switch and bias MAX2674/max2676 4 typical operating characteristics (continued) (MAX2674/max2676 ev kit. typical values are at v cc = 3.3v, t a = +25 n c, unless otherwise specified.) MAX2674 output return loss vs. frequency MAX2674 toc04 |s22| (db) -25 -20 -15 -10 -5 0 -30 frequency (mhz) 2250 2000 750 1000 1250 1500 1750 500 2500 lna antenna MAX2674 active path in-band iip3 vs. supply voltage and temperature (two tones located at 1mhz and 2mhz offset with -30dbm/tone) MAX2674 toc05 supply voltage (v) iip3 (dbm) 3.0 2.8 2.6 2.4 2.2 2.0 1.8 -3 -2 -1 0 -4 1.6 3.2 -40c +25c +85c MAX2674 antenna path in-band iip3 vs. supply voltage and temperature (two tones located at 1mhz and 2mhz offset with -10dbm/tone) MAX2674 toc06 supply voltage (v) iip3 (dbm) 3.0 2.8 2.6 2.4 2.2 2.0 1.8 29.5 30.0 30.5 31.0 31.5 32.0 29.0 1.6 3.2 +85c +25c -40c MAX2674 active path out-of-band iip3 vs. supply voltage and temperature (tone1 at -27dbm/1713mhz, tone2 at -39dbm/1851mhz) MAX2674 toc07 supply voltage (v) iip3 (dbm) 3.0 2.8 1.8 2.0 2.2 2.4 2.6 -2 -1 0 1 2 3 4 5 -3 1.6 3.2 -40c +25c +85c MAX2674 active path input p2db vs. supply voltage and temperature (tone1 at -27dbm/1713mhz, tone2 at -39dbm/1851mhz) MAX2674 toc08 supply voltage (v) input p2db (dbm) 3.2 3.0 2.6 2.8 2.0 2.2 2.4 1.8 -13 -12 -11 -10 -9 -8 -7 -6 -5 -4 -14 1.6 +85c +25c -40c MAX2674 active path 2db gain desense vs. blocker frequency MAX2674 toc09 frequency (mhz) blocker power (dbm) 2250 2000 750 1000 1250 1500 1750 -7 -6 -5 -4 -3 -2 -1 0 -8 500 2500 max2676 input return loss vs. frequency MAX2674 toc10 frequency (mhz) |s11| (db) -40 -35 -30 -25 -20 -15 -10 -5 0 -45 2250 2000 750 1000 1250 1500 1750 500 2500 lna antenna
gps/gnss lnas with antenna switch and bias MAX2674/max2676 5 typical operating characteristics (continued) (MAX2674/max2676 ev kit. typical values are at v cc = 3.3v, t a = +25 n c, unless otherwise specified.) max2676 gain vs. frequency MAX2674 toc11 gain (db) -10 -5 0 5 10 15 20 25 -15 frequency (mhz) 2250 2000 750 1000 1250 1500 1750 500 2500 lna antenna max2676 reverse isolation vs. frequency MAX2674 toc12 frequency (mhz) |s12| (db) -60 -50 -40 -30 -20 -10 0 -70 2250 2000 750 1000 1250 1500 1750 500 2500 lna antenna max2676 output return loss vs. frequency MAX2674 toc13 |s22| (db) -35 -30 -25 -20 -15 -10 -5 0 -40 frequency (mhz) 2250 2000 750 1000 1250 1500 1750 500 2500 lna antenna max2676 active path in-band iip3 vs. supply voltage and temperature (two tones located at 1mhz and 2mhz offset with -30dbm/tone) MAX2674 toc14 supply voltage (v) iip3 (dbm) 3.0 2.8 1.8 2.0 2.2 2.4 2.6 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 2.0 1.6 3.2 -40c +25c +85c max2676 antenna path in-band iip3 vs. supply voltage and temperature (two tones located at 1mhz and 2mhz offset with -10dbm/tone) MAX2674 toc15 supply voltage (v) iip3 (dbm) 3.0 2.8 2.6 2.4 2.2 2.0 1.8 29.5 30.0 30.5 31.0 31.5 32.0 29.0 1.6 3.2 +85c +25c -40c max2676 active path out-of-band iip3 vs. supply voltage and temperature (tone1 at -27dbm/1713mhz, tone2 at -39dbm/1851mhz) MAX2674 toc16 supply voltage (v) iip3 (dbm) 3.0 2.8 1.8 2.0 2.2 2.4 2.6 2 3 4 5 6 7 8 1 1.6 3.2 +25c -40c +85c max2676 active path input p2db vs. supply voltage and temperature (tone1 at -27dbm/1713mhz, tone2 at -39dbm/1851mhz) MAX2674 toc17 supply voltage (v) input p2db (dbm) 3.2 3.0 2.6 2.8 2.0 2.2 2.4 1.8 -11 -10 -9 -8 -7 -6 -5 -4 -3 -2 -12 1.6 +85c +25c -40c max2676 active path 2db gain desense vs. blocker frequency MAX2674 toc18 frequency (mhz) blocker power (dbm) 2250 2000 750 1000 1250 1500 1750 -4 -3 -1 -2 0 1 2 3 4 -6 -5 500 2500
gps/gnss lnas with antenna switch and bias MAX2674/max2676 6 bump configuration bump description pin name function a1 v cc v cc . place bypass capacitor as close as possible to the pin. a2 rfout/ shdn rf output and shutdown logic input. output match is included on-chip. couple shdn logic control through a 25k i resistor. dc logic-low shuts down the part. b1 rfin rf input. requires a dc-blocking capacitor and an external inductor matching component. b2 gndac ground for rf circuits. connect to the 2nd layer pcb ground plane with a via next to the pad. c1 gnddc ground for dc and bias circuits. connect to the 2nd layer pcb ground plane with a via next to the pad. c2 ant antenna input top view v cc rfin gnddc rfout/shdn gndac ant a1 a2 b1 b2 c1 c2 MAX2674 max2676
gps/gnss lnas with antenna switch and bias MAX2674/max2676 7 detailed description the MAX2674/max2676 are low-power lnas designed for gps/gnss receiver applications. the devices feature low noise and high linearity in an ultra-small package. they also include an antenna switch and circuitry sup - porting bias to accommodate external lna applications. input and output matching to achieve optimal performance in noise figure, gain, and iip3, the devices require one matching inductor at rfin in series with a dc-blocking capacitor. rfout/ shdn is internally matched to 50 i , eliminating the need for external matching components. at rfout/ shdn , an external dc-blocking capacitor should be used to isolate the shutdown control function. shutdown mode to place the device in shutdown mode, apply logic-low to rfout/ shdn through a 25k? resistor. an additional dc-blocking capacitor or component is required at rfout/ shdn in this case. apply a logic-high state or no dc bias to turn the part permanently on. dc supply decoupling and layout a properly designed pc board (pcb) is essential to any rf microwave circuit. use controlled-impedance lines on all high-frequency inputs and outputs. bypass v cc with a decoupling capacitor located close to the device. for long v cc lines, it may be necessary to add additional decoupling capacitors. locate these additional capaci - tors further away from the device package. proper grounding of gnd_ pins is essential. if the pcb uses a top-side rf ground, connect it directly to the gnd_ pins. for a board where the ground is not on the component layer, connect the gnd_ pins to the board with multiple vias close to the package. antenna switch control the MAX2674/max2676 ant input includes an autode - tection feature. when no current is drawn from ant, the switch defaults to normal lna operation. the pin can be directly connected to an external active antenna. the device automatically switches to the ant input when an external active antenna is connected. refer to www.maxim-ic.com for the MAX2674/max2676 ev kit schematic, layout files, bom information, and s-parameters. t able 1 . MAX2674 typical noise parameters (v cc = 2.85v, t a = +25c) table 2. max2676 typical noise parameters (v cc = 2.85v, t a = +25c) frequency (mhz) nf min (db) gamma_opt mag ( ) gamma_opt phase ( ) rn ( i ) 1550 0.651 0.446 44.1 8.33 1560 0.652 0.445 44.3 8.33 1570 0.654 0.445 44.6 8.32 1580 0.655 0.444 44.8 8.31 1590 0.656 0.444 45.1 8.3 1600 0.657 0.443 45.4 8.3 frequency (mhz) nf min (db) gamma_opt mag ( ) gamma_opt phase ( ) rn ( i ) 1550 0.744 0.441 53.1 8.7 1560 0.746 0.44 53.4 8.68 1570 0.748 0.439 53.7 8.66 1580 0.75 0.438 54 8.65 1590 0.751 0.437 54.3 8.63 1600 0.753 0.436 54.7 8.62
gps/gnss lnas with antenna switch and bias MAX2674/max2676 8 package information for the latest package outline information and land patterns, go to www.maxim-ic.com/packages . note that a +, #, or - in the package code indicates rohs status only. package drawings may show a different suffix character, but the drawing pertains to the package regardless of rohs status. chip information process: sige bicmos package type package code outline no. land pattern no. 6 wlp w61b1+1 21-0217 refer to application note 1891
gps/gnss lnas with antenna switch and bias MAX2674/max2676 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. maxim integrated products, 120 san gabriel drive, sunnyvale, ca 94086 408-737-7600 9 ? 2010 maxim integrated products maxim is a registered trademark of maxim integrated products, inc. revision history revision number revision date description pages changed 0 12/10 initial release
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