general description the max2202 rms power detector is designed tooperate from 800mhz to 2.0ghz. the device is ideal for wideband code-division multiple access (wcdma), cdma2000 , and high-speed downlink/uplink packet access. the device accepts an rf signal at the inputand outputs the same voltage regardless of the peak- average of the input signal. the output voltage and input power is linear in db. the device has a -29dbm to 0dbm detection range, and every db change in input power gives 33mv (typ) change in out- put voltage. the device operates from a 2.5v to 4.2v supply and is specified over the -40? to +85? extended tempera- ture range. the device is available in a 6-bump wlp package. applications lte, wcdma, cdma2000, 1xevdohigh-speed downlink packet access (hsdpa) high-speed uplink packet access (hsupa) features ? -29dbm to 0dbm power-detection range ? 33mv/db (typ) log detector ? 0.1db (typ) rms accuracy from wcdmamodulation change ? ?.4db detection error due to temperature ? +2.5v to +4.2v single-supply operation ? space-saving 6-bump wlp package max2202 rms power detector ________________________________________________________________ maxim integrated products 1 ordering information 19-5496; rev 1; 2/11 for pricing, delivery, and ordering information, please contact maxim direct at 1-888-629-4642, or visit maxim? website at www.maxim-ic.com. evaluation kit available part temp range pin- package top mark MAX2202EWT+t10 -40 c to +85 c 6 wlp aa + denotes a lead(pb)-free/rohs-compliant package. t = tape and reel. cdma2000 is a registered trademark of the telecommunications industry association. c1 v cc v cc + a1 rfin/ ena rf input from directional coupler enable logic input b1 gnd c2 out to adc test point c24700pf 220pf sma c10.1 f must be x5ror x7r type 10k 24.3k 50 1% b2 filt a2 gnd termination resistor not needed if two or more directional couplers are used and configured as in figure 1. 0.1 f max2202 1 f typical operating circuit type c1 (f) c2 (nf) wcdma 0.1 4.7 ncdma 0.33 15 downloaded from: http:///
max2202 rms power detector 2 _______________________________________________________________________________________ absolute maximum ratingspackage thermal characteristics (notes 2) dc electrical characteristics (v cc = 2.5v to 4.2v, t a = -40? to +85?, v ena = 2.7v, no rf signal applied. typical values are at v cc = 2.8v, t a = +25?, unless otherwise noted.) (note 3) 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. note 3: guaranteed by production test at t a = +85? and 800mhz. guaranteed by design and characterization at t a = -40? and t a = +25?, and over frequency limits. note 4: guaranteed by design and characterization. note 5: log conformance is defined with respect to 4 calibration points, -1dbm, -7dbm, -19dbm, and -29dbm, at t a = +25?. v cc to gnd ...........................................................-0.3v to +4.5v ena, out, filt to gnd ........................................-0.3v to +3.0v rfin input power ...........................................................+10dbm continuous power dissipation (t a = +70 c) 6-bump wlp (derate 2.9mw/ c above +70 c)...........232mw operating temperature range ...........................-40 c to +85 c storage temperature range .............................-65 c to +160 c junction temperature .....................................................+150 c soldering temperature (reflow, note 1)...........................+260 c 6 wlp junction-to-ambient thermal resistance ( ja ) ...........95 c/w parameter symbol conditions min typ max units supply voltage v cc 2.5 2.8 4.2 v supply current i cc v cc = 2.8v, rf input = -29dbm to 0dbm 5.5 8.5 ma shutdown supply current v ena = 0v 0.5 10 ? ena logic-high threshold v ih 1.1 2.7 v ena logic-low threshold v il 0 0.6 v ena input current v ena = 1.1v or 0.6v 25 ? ac electrical characteristics(v cc = 2.8v, t a = -40? to +85?, v ena = 2.7v, f rf = 800mhz to 2ghz, unless otherwise noted. typical values are at t a = +25?.) (note 3) parameter symbol conditions min typ max units rf input frequency 800 2000 mhz max i mum output voltage rfin at 0dbm 1 . 05 1 . 31 . 5v mini mum output voltage no rf i nput power, v ena = 2 . 7v 250 450 mv minimum input power level +1db input power step results i n v out increase > 23mv/db (note 4) -29 dbm log slope [(v out at -1dbm) - (v out at -29dbm)]/28 23 33 43 mv/db log conformance error with 10db step (notes 4, 5) -1 . 0+ 1 . 0d b power-detector accuracy due totemperature rf input at -4dbm to -1dbm, t a = -20 c to +25 c, and t a = +25 c to +85 c ? . 4d b note 1: refer to application note 1891: wafer-level packaging (wlp) and its applications . note 2: package thermal resistances were obtained using the method described in jedec specification jesd51-7, using a four-layer board. for detailed information on package thermal considerations, refer to www.maxim-ic.com/thermal-tutorial . caution! esd sensitive device downloaded from: http:///
max2202 rms power detector _______________________________________________________________________________________ 3 output voltage vs. input power max2202 toc01 input power (dbm) output voltage (v) 5 0 -10 -5 -25 -20 -15 -30 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 0 -35 10 2ghz 800mhz pcs wcdma 1+1 vs. 1+5 rms error ( deviation from midpoint) max2202 toc02 input power (dbm) rms error (db) 0 -5 -25 -20 -15 -10 -0.05 0 0.05 0.10 0.15 0.20 0.25 0.30 -0.10 -30 5 t a = +85c t a = -20c t a = +25c cell wcdma 1 + 1 vs. 1 + 5 rms error ( deviation from midpoint) max2202 toc03 input power (dbm) rms error (db) 0 -5 -25 -20 -15 -10 -0.05 0 0.05 0.10 0.15 0.20 0.25 0.30 -0.10 -30 5 t a = +85c t a = -20c t a = +25c log conformance with 1db step cellular band max2202 toc04 input power (dbm) log conformance (db) -4 -7 -13 -10 -22 -19 -16 -25 -0.4 -0.3 -0.2 -0.1 0 0.1 0.2 0.3 0.4 0.5 -0.5 -28 -1 mean - 3s mean + 3s mean log conformance with 1db step pcs band max2202 toc05 input power (dbm) log conformance (db) -4 -7 -13 -10 -22 -19 -16 -25 -0.4 -0.3 -0.2 -0.1 0 0.1 0.2 0.3 0.4 0.5 -0.5 -28 -1 mean - 3s mean mean + 3s log conformance with 10db step cellular band max2202 toc06 input power (dbm) log conformance (db) -4 -7 -16 -13 -10 -0.8 -0.6 -0.4 -0.2 0 0.4 0.60.2 0.8 1.0 -1.0 -19 -1 mean mean - 3s 4 calibration points -29dbm, -19dbm, -7dbm, -1dbm mean + 3s log conformance with 10db step pcs band max2202 toc07 input power (dbm) log conformance (db) -4 -7 -16 -13 -10 -19 -1 -0.8 -0.6 -0.4 -0.2 0 0.4 0.60.2 0.8 1.0 -1.0 4 calibration points -29dbm, -19dbm, -7dbm, -1dbm mean mean - 3s mean + 3s 47-unit cellular room-cold temperature error max2202 toc08 input power (dbm) temperature error (db) 0 -5 -10 -15 -20 -25 -1.0 -0.5 0 0.5 1.0 1.5 -1.5 -30 5 typical operating characteristics (v cc = 2.7v, t a = +25?, wcdma uplink dpcch + 1dpdch, log conformance calculation is referenced to a straight line that is calibrated at -20dbm and 0dbm, unless otherwise noted.) downloaded from: http:///
max2202 rms power detector 4 _______________________________________________________________________________________ typical operating characteristics (continued) (v cc = 2.7v, t a = +25?, wcdma uplink dpcch + 1dpdch, log conformance calculation is referenced to a straight line that is calibrated at -20dbm and 0dbm, unless otherwise noted.) 47-unit pcs room-cold temperature error max2202 toc09 input power (dbm) temperature error (db) 0 -5 -10 -15 -20 -25 -1.0 -0.5 0 0.5 1.0 1.5 -1.5 -30 5 47-unit cellular room-hot temperature error max2202 toc10 input power (dbm) temperature error (db) 0 -5 -10 -15 -20 -25 -1.0 -0.5 0 0.5 1.0 1.5 -1.5 -30 5 47-unit pcs room-hot temperature error max2202 toc11 input power (dbm) temperature error (db) 0 -5 -10 -15 -20 -25 -1.0 -0.5 0 0.5 1.0 1.5 -1.5 -30 5 turn-on time max2202 toc14 0.5v/div 50mv/div 40s/div input power = -25dbm, 800mhz turn-on time max2202 toc15 0.5v/div 50mv/div 40s/div input power = -25dbm, 2000mhz turn-on time max2202 toc12 0.5v/div0.2v/div 40s/div input power = 0dbm, 800mhz turn-on time max2202 toc13 0.5v/div0.2v/div 40s/div input power = 0dbm, 2000mhz rfin s11 max2202 toc16 frequency (mhz) s11 (db) phase (degrees) 2400 2100 600 900 1200 1500 1800 -16 -14 -12 -10 -8 -6 -4 -2 -18 -150 -100 -50 0 50 100 150 200-200 300 2700 input shuntr = 49.9 i input seriesc = 220pf s11 phase downloaded from: http:///
detailed description the max2202 rms power detector is designed tooperate from 800mhz to 2.0ghz. the device is ideal for lte, wcdma, cdma2000, and high-speed downlink/ uplink packet access. the device accepts an rf signal at the input and outputs the same voltage regardless of the peak-average of the input signal. the output volt-age and input power is linear in db. the device has a -29dbm to 0dbm detection range, and every db change in input power gives 33mv (typ) change in out- put voltage. table 1 shows the peak to average of the signals used to test the device. max2202 rms power detector _______________________________________________________________________________________ 5 bump description bump name function a1 rfin/ena rf input and enable logic input. see the tpical operating circuit . drive ena high to turn on the device. drive ena low to place it in shutdown mode. a2, b1 gnd ground. connect to pcb ground plane. b2 filt intermediate filtering node. bpass filt with a capacitor as close as possible to the de vice. c1 v cc power suppl. connect to either a regulated suppl or batter. bpass v cc with a capacitor as close as possible to the device. c2 out detector output. connect an external lowpass rc filter for filtering. par at different probability of complementary cumulative distribution (db) modulation 10% 1% 0.1% 0.01% dpcch + 1dpdch 4.8 5.8 6.2 6.5 dpcch + 5dpdch 6.5 8.4 9.2 9.8 is95 reverse 5.5 6.9 7.6 8.1 is95 forward pilot 5.6 7.6 8.8 9.5 9-channel forward 7 10.3 12 12.7 cdma2000 pilot + dcch 6.8 8.3 9.2 9.7 table 1. peak-to-average ratio (par*) of test signals * par of cw is 3db. v cc a 12 + rfin/ena gnd out filt gnd top view(bumps on bottom) b c max2202 bump configuration downloaded from: http:///
max2202 applications information detector rf input the max2202 generally requires a terminating resistorand series capacitor between the directional coupler? output and detector rf input. as shown in the typical operating characteristics , an s11 of less than -9db is possible when a terminating resistor of 50 and series capacitor of 220pf are used at the input. s11 of themax2202 rfin port without input matching is shown in table 2 and can be downloaded from maxim? website. in cases where the detector is connected to two or more directional couplers, as shown in figure 1, the 50 terminating resistor can be eliminated. detector voltage output the output of the max2202 goes to an adc for furtherprocessing by the baseband system. connect a series 10k resistor and a shunt capacitor to the detector out- put to reduce residual amplitude ripple. the shuntcapacitor should be 4.7nf for wcdma and 15nf for ncdma. enable logic level the device features an enable input (ena) that allowsthe device to be put into shutdown. for normal opera- tion, drive ena high. for device shutdown, drive ena low. the ena pin is dc biased through a resistor. the value of the resistor is recommended to be greater than rms power detector 6 _______________________________________________________________________________________ pa 1pa 2 coupler 1coupler 2 10 10 50 50 enable rms detect buffer bias detector output max2202 figure 1. system level connection freq (mhz) s11 (db) s11 (phase) freq (mhz) s11 (db) s11 (phase) 300 -1.63 -34.1 1560 -1.37 -156.4 360 -1.69 -39.6 1620 -1.35 -162.4 420 -1.75 -44.9 1680 -1.35 -168.0 480 -1.77 -50.2 1740 -1.35 -173.7 540 -1.77 -55.9 1800 -1.36 -179.2 600 -1.75 -61.4 1860 -1.36 175.3 660 -1.74 -66.9 1920 -1.41 170.0 720 -1.72 -72.6 1980 -1.35 164.8 780 -1.70 -78.6 2040 -1.37 159.6 840 -1.62 -84.2 2100 -1.34 154.5 900 -1.59 -90.2 2160 -1.36 149.2 960 -1.53 -96.2 2220 -1.37 144.2 1020 -1.52 -102.2 2280 -1.37 139.2 1080 -1.45 -108.4 2340 -1.39 134.5 1140 -1.46 -114.5 2400 -1.37 129.5 1200 -1.40 -120.5 2460 -1.39 124.7 1260 -1.40 -126.5 2520 -1.38 119.9 1320 -1.39 -132.6 2580 -1.40 115.2 1380 -1.37 -138.9 2640 -1.39 110.4 1440 -1.35 -144.6 2700 -1.40 105.7 1500 -1.37 -150.6 table 2. rf input s11 note: v cc = 2.8v, s11 measured at rfin bump. downloaded from: http:///
1k to avoid loading the rf input signal. there is an internal resistor to gnd of approximately 50k . if the control source high voltage is greater than 2.8v, calcu-late and use a resistor value that ensures the ena pin only sees a maximum of 2.7v, which is within specifica- tion. in this manner, the device can be driven from a control device with a logic-high greater than 2.8v. evaluation kit information max2202 ev kit gerber files, schematic, bom, andother updates are available on the max2202 product page at maxim? website ( www.maxim-ic.com ). layout the device is not particularly sensitive to the layoutsince it only needs 3dbm for maximum output voltage. however, there are two areas that need attention: the gnd pins and the supply bypassing. connect the gnd pins to the pcb ground with a ground via as close as possible, and bypass v cc to ground with a capacitor as close as possible to the part. max2202 rms power detector _______________________________________________________________________________________ 7 chip information process: bicmos package information for the latest package outline information and land pat-terns (footprints), go to www.maxim-ic.com/packages . note that a ?? ?? or ??in the package code indi-cates rohs status only. package drawings may show a different suffix character, but the drawing pertains to the package regardless of rohs status. package type package code outline no. land pattern no. 6 wlp w61b1+1 21-0217 refer to application note 1891 downloaded from: http:///
revision history revision number revision date description pages changed 0 9/10 initial release 1 2/11 updated log conformance error with 10db step specifications in ac electrical characteristics ; updated toc 6 and 7 in typical operating characteristics 2, 3 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. 8 _____________________maxim integrated products, 120 san gabriel drive, sunnyvale, ca 94086 408-737-7600 2011 maxim integrated products maxim is a registered trademark of maxim integrated products, inc. rms power detector max2202 downloaded from: http:///
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