MAX2691 l2 band gps low-noise amplifier ????????????????????????????????????????????????????????????????? maxim integrated products 1 typical application circuit 19-6158; rev 0; 12/11 ordering information appears at end of data sheet. for related parts and recommended products to use with this part, refer to www.maxim-ic.com/MAX2691.related . general description the MAX2691 low-noise amplifier (lna) is designed for gps l2 applications. designed in maxims advanced sige process, the device achieves high gain and low noise figure while maximizing the input-referred 1db compression point and the 3rd-order intercept point. the MAX2691 provides a high gain of 17.5db and sub 1db noise figure. the device operates from a +1.6v to +3.6v single sup - ply. the optional shutdown feature in the device reduces the typical supply current to 4 f a. the device is available in a very small, lead-free, rohs-compliant, 0.86mm x 0.86mm x 0.65mm wafer-level package (wlp). applications precision navigation telematics (asset tracking and management) avionics features s high-power gain: 17.5db s low-noise figure: 0.93db s integrated 50 output matching circuit s low supply current: 4.3ma s wide supply voltage range: 1.6v to 3.6v s low bill of materials: one inductor, two capacitors s small footprint: 0.86mm x 0.86mm s thin profile: 0.65mm s 0.4mm-pitch wafer-level package (wlp) evaluation kit available MAX2691 a1 a2 b1 b2 optional shutdown gnd shdn r1 25ki rf output rfout v cc v cc c2 rf input c1 l1 rfin MAX2691 l1 = 8.2nh c1 = 100nf c2 = 10pf for pricing, delivery, and ordering information, please contact maxim direct at 1-888-629-4642, or visit maxims website at www.maxim-ic.com.
????????????????????????????????????????????????????????????????? maxim integrated products 2 MAX2691 l2 band gps low-noise amplifier v cc to gnd .......................................................... -0.3v to +3.6v other pins to gnd (except rfin) ................... -0.3v to (+ operating v cc + 0.3v) maximum current into rf input ......................................... 10ma maximum rf input power ............................................... +5dbm continuous power dissipation (t a = +70c) 4-bump wlp (derates 9.7mw/c above +70c) ........ 776mw operating temperature range .......................... -40c to +85c junction temperature ..................................................... +150c storage temperature range ............................ -65c to +160c lead temperature (soldering, 10s) ........ reflow profile (note 1) soldering temperature (reflow) ...................................... +260c absolute maximum ratings note 1: refer to application note 1891: wafer-level packaging (wlp) and its applications . stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device. these are stress ratings only, and functional opera - tion 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. dc electrical characteristics (MAX2691 ev kit, v cc = 1.6v to 3.6v, t a = -40c to +85c, no rf signals are applied. typical values are at v cc = 2.85v and t a = +25c, unless otherwise noted.) (note 2) ac electrical characteristics (MAX2691 ev kit, v cc = 1.6v to 3.6v, t a = -40c to +85c, f rfin = 1227mhz. typical values are at v cc = 2.85v and t a = +25c, unless otherwise noted.) (note 2) caution! esd sensitive device parameter conditions min typ max units supply voltage 1.6 2.85 3.6 v supply current shdn = high 4.3 ma shutdown mode, shdn = low 4.0 20 a digital input logic-high (note 3) 1.2 v digital input logic-low (note 3) 0.45 v parameter conditions min typ max units rf frequency l2 band 1227 mhz power gain (note 4) v cc = 2.85v 13.3 17.5 db v cc = 1.6v 13.1 17.4 noise figure v cc = 1.6v to 3.3v 0.93 db in-band 3rd-order input intercept point (note 5) -3.0 dbm input 1db compression point (note 6) -8.5 dbm input return loss 10.9 db
????????????????????????????????????????????????????????????????? maxim integrated products 3 MAX2691 l2 band gps low-noise amplifier note 2: min and max limits guaranteed by test at t a = +25c and guaranteed by design and characterization at t a = -40c and t a = +85c, unless otherwise noted. note 3: min and max limits guaranteed by test at t a = +25c. note 4: min limit guaranteed by design and characterization. note 5: measured with the two tones located at 1mhz and 2mhz offset from the center of the gps band with -30dbm/tone. note 6: measured with a tone located at 5mhz offset from the center of the gps band. ac electrical characteristics (continued) (MAX2691 ev kit, v cc = 1.6v to 3.6v, t a = -40c to +85c, f rfin = 1227mhz. typical values are at v cc = 2.85v and t a = +25c, unless otherwise noted.) (note 2) typical operating characteristics (MAX2691 ev kit. typical values are at v cc = 2.85v, t a = +25c, and f rfin = 1227mhz, unless otherwise noted.) parameter conditions min typ max units output return loss 15.6 db reverse isolation 45 db input return loss vs. frequency MAX2691 toc01 frequency (mhz) | s11 | (db) 2000 1500 1000 -40 -35 -30 -25 -20 -15 -10 -5 0 -45 500 2500 gain vs. frequency MAX2691 toc02 frequency (mhz) gain (db) 2000 1500 1000 -5 0 5 10 15 20 -10 500 2500 reverse isolation vs. frequency MAX2691 toc03 frequency (mhz) | s12 | (db) 2000 1500 1000 -80 -70 -60 -50 -40 -30 -20 -10 0 -90 500 2500
????????????????????????????????????????????????????????????????? maxim integrated products 4 MAX2691 l2 band gps low-noise amplifier typical operating characteristics (continued) (MAX2691 ev kit. typical values are at v cc = 2.85v, t a = +25c, and f rfin = 1227mhz, unless otherwise noted.) output return loss vs. frequency MAX2691 toc04 frequency (mhz) | s22 | (db) 2000 1500 1000 -20 -15 -10 -5 0 -25 500 2500 1db gain desense vs. blocker frequency MAX2691 toc07 blocker frequency (mhz) blocker power (dbm) 2000 1500 1000 -15 -10 -5 0 5 -25 -20 500 2500 inband iip3 vs. supply voltage and temperature MAX2691 toc05 supply voltage (v) iip3 (dbm) 3.1 2.6 2.1 -3 -2 -1 0 1 2 -4 1.6 3.6 two tones located at +1mhz and +2mhz from 1227mhz. p in = -30dbm/tone t a = -40c t a = +25c t a = +85c input p1db compression vs. supply voltage and temperature MAX2691 toc06 supply voltage (v) input p1db (dbm) 3.1 2.6 2.1 -14 -12 -10 -8 -6 -16 1.6 3.6 t a = -40c t a = +25c t a = +85c
????????????????????????????????????????????????????????????????? maxim integrated products 5 MAX2691 l2 band gps low-noise amplifier bump description bump configuration detailed description the MAX2691 lna is designed for gps l2 applications. the device features a power-shutdown control mode to eliminate the need for an external supply switch. the device achieves high gain, low noise figure, and excellent linearity. input and output matching the MAX2691 requires an off-chip input match. only an inductor in series with a dc-blocking capacitor is needed to form the input matching circuit. the typical application circuit shows the recommended input-matching network. these values are optimized for the best simultane - ous gain, noise figure, and return loss performance. reducing the input coupling capacitor results in a lower iip3. the device integrates an on-chip output matching to 50 i at the output, eliminating the need for external matching components. table 1 lists typical device s parameters and k f values. typical noise parameters are shown in table 2 . shutdown the MAX2691 includes an optional shutdown feature to turn off the entire chip. the device is placed in active mode by default once v cc is applied, due to the on-chip pullup resistor to v cc at the rfout bump (shared with the shdn input). to shut down the part, apply a logic-low to the rfout bump through an external resistor with an adequate value, e.g., 25k i , in order not to load the rf output signal during active operation. applications information a properly designed pcb is essential to any rf micro - wave 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 further away from the device package. proper grounding of the gnd pin is essential. if the pcb uses a topside rf ground, connect it directly to the gnd pin. for a board where the ground is not on the component layer, connect the gnd pin to the board with multiple vias close to the package. refer to www.maxim-ic.com for the MAX2691 ev kit schematic, gerber data, pads layout file, and bom information. bump name function a1 v cc supply voltage. bypass to ground with a 10pf capacitor as close as possible to the ic. a2 rfout ( shdn ) rf output/ shdn input. rfout is internally matched to 50 i and pulled up to v cc through a 1m i resistor. shdn is shared with the rfout bump. the device is in active mode by default once v cc is applied. rfout( shdn ) can be pulled to a dc low through a 25k i resistor to shut down the ic. b1 rfin rf input. requires a dc-blocking capacitor and external matching components. b2 gnd ground. connect to the pcb ground plane. wlp top view MAX2691 rfin v cc gnd rfout (shdn) a1 a2 b1 b2 +
????????????????????????????????????????????????????????????????? maxim integrated products 6 MAX2691 l2 band gps low-noise amplifier table 1. typical s parameter values and k-factor table 2. typical noise parameters (v cc = 2.85v, t a = +25 n c) package information for the latest package outline information and land patterns (footprints), 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. ordering information chip information process: sige bicmos + denotes a lead(pb)-free/rohs-compliant package. t = tape and reel. freq. (mhz) s11 mag (db) s11 phase (degrees) s21 mag (db) s21 phase (degrees) s12 mag (db) s12 phase (degrees) s22 mag (db) s22 phase (degrees) k f 700 -2.1 -78.1 3.5 -175.7 -54.0 113.3 -1.3 -124.9 16.75126 800 -2.5 -87.1 6.0 175.7 -47.7 112.0 -1.6 -143.3 8.847551 900 -2.8 -96.2 8.8 163.0 -55.5 85.4 -2.4 -162.8 22.33037 1000 -3.1 -104.3 11.7 146.2 -53.8 54.0 -3.9 175.0 19.54059 1100 -3.4 -112.3 14.4 119.2 -46.3 33.8 -8.3 149.5 9.366309 1200 -3.7 -119.4 16.0 83.5 -46.9 15.3 -19.1 -126.9 9.788318 1220 -3.7 -120.7 16.1 75.6 -47.6 -1.0 -14.2 -114.7 10.25069 1240 -3.7 -122.4 16.0 67.9 -49.4 20.3 -10.9 -114.4 12.09861 1260 -3.8 -123.7 15.9 60.1 -49.7 14.9 -8.7 -118.5 12.1323 1280 -3.8 -125.0 15.6 52.8 -47.3 -6.0 -6.9 -124.3 8.793041 1300 -3.8 -126.6 15.2 46.0 -43.5 19.6 -5.7 -130.2 5.277003 1400 -4.0 -133.5 13.4 18.4 -44.9 -22.8 -2.6 -157.6 4.94144 1500 -4.1 -140.3 11.3 -0.5 -48.5 -21.4 -1.6 -179.3 6.656188 1600 -4.1 -147.6 9.4 -15.6 -47.7 -23.6 -1.3 163.8 5.983826 1700 -4.1 -154.6 7.8 -28.5 -44.8 -16.5 -1.0 148.8 4.18904 frequency (mhz) fmin (db) | g opt | | g opt | angle r n ( i ) 1200 0.66 0.45 47 8.37 1210 0.66 0.45 48 8.35 1220 0.66 0.45 48 8.33 1230 0.66 0.45 48 8.30 1240 0.66 0.45 49 8.28 1250 0.66 0.45 49 8.26 1260 0.66 0.45 50 8.24 1270 0.67 0.45 50 8.22 1280 0.67 0.44 50 8.20 1290 0.67 0.44 51 8.18 1300 0.67 0.44 51 8.17 part temp range pin-package MAX2691ews+t -40 n c to +85 n c 4 wlp package type package code outline no. land pattern no. 4 wlp w40a0+1 21-0480 refer to application note 1891
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. the parametric values (min and max limits) shown in the electrical characteristics table are guaranteed. other parametric values quoted in this data sheet are provided for guidance. maxim integrated products, 120 san gabriel drive, sunnyvale, ca 94086 408-737-7600 7 ? 2011 maxim integrated products maxim is a registered trademark of maxim integrated products, inc. MAX2691 l2 band gps low-noise amplifier revision history revision number revision date description pages changed 0 12/11 initial release
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