general description the max2203 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 max2203 accepts an rf signal at theinput and 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 -24dbm to +3dbm detection range, and every db change in input power gives 35mv (typ) change in out- put voltage. the max2203 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 wcdma, cdma2000, 1xevdohigh-speed downlink packet access (hsdpa) high-speed uplink packet access (hsupa) features ? -24dbm to +3dbm power-detection range ? 35mv/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 max2203 rms power detector ________________________________________________________________ maxim integrated products 1 v cc a 12 + rfin/ena gnd out filt gnd top view(bumps on bottom) b c max2203 pin configuration ordering information 19-4982; rev 0; 10/09 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 MAX2203EWT+t10 -40 c to +85 c 6 wlp aa + denotes a lead(pb)-free/rohs-compliant package. t = tape and reel. typical operating circuit appears at end of data sheet. cdma2000 is a registered trademark of telecommunications industry association. downloaded from: http:///
max2203 rms power detector 2 _______________________________________________________________________________________ absolute maximum ratingsdc 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: input power -24dbm to +3dbm. ideal straight line calibrated with input power -20dbm and 0dbm 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 junction-to-ambient thermal resistance ( ja ) (note 1) ......................................................................347?/w operating temperature range ...........................-40 c to +85 c storage temperature range .............................-65 c to +160 c junction temperature .....................................................+150 c lead temperature (soldering, 10s)..........reflow profile (note 2) 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 = -24dbm to +3dbm 5 8 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 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 maximum output voltage rfin at +3dbm 1.05 1.5 1.75 v minimum output voltage no rf input power 300 400 mv minimum input power level +1db input power step results in at least 25mv increase in v out (note 4) -24 dbm log slope [(v out at +3dbm) - (v out at -24dbm)]/27 25 35 45 mv/db log conformance error with 10db step (notes 4, 5) -1.3 +1.3 db power-detector accuracy due to temperature rf input at -4dbm to 0dbm, t a = -40 c to +85 c, relative to +25 c 0.4 db note 1: package thermal resistances were obtained using the method described in jedec specifications. for detailed informationon package thermal considerations, refer to www.maxim-ic.com/thermal-tutorial . note 2: refer to application note 1891: wafer-level packaging (wlp) and its applications . caution! esd sensitive device downloaded from: http:///
max2203 rms power detector _______________________________________________________________________________________ 3 output voltage vs. input power max2203 toc01 input power (dbm) output voltage (v) 0 -5 -10 -15 -20 -25 0.4 0.6 0.8 1.0 1.2 1.4 1.60.2 -30 5 2000mhz 800mhz pcs wcdma 1+1 vs. 1+5 rms error ( deviation from midpoint) max2203 toc02 p in (dbm) rms error (db) 0.05 0.10 0.15 0.20 0.25 0 -25 -23 -21 -19 -17 -15 -13 -11 -7 -3 -9 -5 1 -1 5 3 cell wcdma 1+1 vs. 1+5 rms error ( deviation from midpoint) max2203 toc03 p in (dbm) rms error (db) 0.020.01 0.03 0.04 0.05 0.06 0 -25 -23 -21 -19 -17 -15 -13 -11 -7 -3 -9 -5 1 -1 5 3 -5 -10 -15 -20 -25 0 -0.2 -0.1 0 0.1 0.2 0.3 -0.3 input power (dbm) log conformance (db) log conformance with 1db step cellular band mean + 3 x stdev mean max2203 toc04 mean - 3 x stdev -5 -10 -15 -20 -25 0 -0.2 -0.1 0 0.1 0.2 0.3 -0.3 input power (dbm) log conformance (db) log conformance with 1db step pcs band mean + 3 x stdev mean max2203 toc05 mean - 3 x stdev log conformance with 10db step cellular band input power (dbm) log conformance (db) -5 -10 -0.6 -0.2 0.2 0.6 1.0 -1.0 -15 0 max2203 toc06 mean + 3 x stdev mean mean - 3 x stdev log conformance with 10db step pcs band input power (dbm) log conformance (db) -5 -10 -0.6 -0.2 0.2 0.6 1.0 -1.0 -15 0 max2203 toc07 mean + 3 x stdev mean mean - 3 x stdev 55-unit cellular room-cold temperature error max2203 toc08 input power (dbm) temperature error (db) 0 -0.2 0.2 0.4 0.6 0.8 -0.4 -25 -23 -21 -19 -17 -15 -13 -11 -7 -3 -9 -5 1 -1 5 3 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:///
max2203 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.) 55-unit pcs room-cold temperature error max2203 toc09 input power (dbm) temperature error (db) -0.6-0.8 -0.4 -0.2 0 0.2 -1.0 -25 -23 -21 -19 -17 -15 -13 -11 -7 -3 -9 -5 1 -1 5 3 55-unit pcs room-hot temperature error max2203 toc10 input power (dbm) temperature error (db) 0.60.4 0.8 1.0 1.2 1.4 0 0.2 -25 -23 -21 -19 -17 -15 -13 -11 -7 -3 -9 -5 1 -1 5 3 55-unit cellular room-hot temperature error max2203 toc11 input power (dbm) temperature error (db) -0.2 0 0.2 0.4 0.6 -0.4 -25 -23 -21 -19 -17 -15 -13 -11 -7 -3 -9 -5 1 -1 5 3 output voltage vs. frequency frequency (mhz) v out (v) 300550 800 10501300 1550 1800 2050 2300 2550 28002800 3050 3300 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 0 50 max2203 toc12 +5dbm -5dbm -10dbm -15dbm -20dbm -25dbm 0dbm turn-on time max2203 toc13 0.5v/div0.2v/div 40s/div input power = 0dbm, 800mhz turn-on time max2203 toc14 0.5v/div0.2v/div 40s/div input power = 0dbm, 2000mhz turn-on time max2203 toc15 0.5v/div 50mv/div 40s/div input power = -25dbm, 800mhz turn-on time max2203 toc16 0.5v/div 50mv/div 40s/div input power = -25dbm, 2000mhz downloaded from: http:///
detailed description the max2203 rms power detector is designed tooperate from 800mhz to 2.0ghz. the device is ideal for wcdma, cdma2000, and high-speed downlink/uplink packet access. the max2203 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 -24dbm to +3dbm detection range, and every db change in input power gives 35mv (typ) change in out- put voltage. table 1 shows the peak to average of the signals used to test the max2203. max2203 rms power detector _______________________________________________________________________________________ 5 pin 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. bypass filt with a capacitor as close as possible to the de vice. c1 v cc power supply. connect to either a regulated supply or battery. bypass 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. downloaded from: http:///
max2203 applications information the max2203 uses external termination when usingdirectional couplers. figure 1 shows the system level connection of dual-band power detection. the output of the detector is typically connected to an adc in cdma2000 or wcdma power-control topology. enable logic level the max2203 features an enable input (ena) thatallows the device to be put into shutdown. for normal operation, 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 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,calculate and use a resistor value that ensures the ena pin only sees a maximum of 2.7v, which is within speci- fication. in this manner, the max2203 can be driven from a control device with a logic-high greater than 2.8v. layout the max2203 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. chip information process: bicmos rms power detector 6 _______________________________________________________________________________________ pa 1pa 2 coupler 1coupler 2 10 10 50 50 enable rms detect buffer bias detector output max2203 figure 1. system level connection downloaded from: http:///
max2203 rms power detector 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 _____________________ 7 2009 maxim integrated products maxim is a registered trademark of maxim integrated products, inc. c1 v cc v cc + a1 rfin/ ena rf input from directional coupler enable logic input b1 gnd c2 out to adc c24700pf 220pf 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 max2203 typical operating circuit package information for the latest package outline information and land patterns, goto www.maxim-ic.com/packages . package type package code document no. 6 wlp w61b1+1 21-0217 type c1 (f) c2 (nf) wcdma 0.1 4.7 ncdma 0.33 15 downloaded from: http:///
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