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1 of 13 functional block diagram rf micro devices?, rfmd?, optimum technology matching?, enabling wireless connectivity?, powerstar?, polaris? total radio? and ultimateblue? are trademarks of rfmd, llc. bluetooth is a trade- mark owned by bluetooth sig, inc., u.s.a. and licensed for use by rfmd. all other trade names, trademarks and registered tradem arks are the property of their respective owners. ?2012, rf micro devices, inc. product description 7628 thorndike road, greensboro, nc 27409-9421 for sales or technical support, contact rfmd at (+1) 336-678-5570 or customerservice@rfmd.com . ordering information txb bth sw pdet rxbn rxbp rx sw tx sw pabc 2 1 7 8 9 10 11 12 15 16 gnd vb 3 bt 4 paen gnd 14 ant 13 vb 6 vb 5 balun rffm3482q 2.4ghz to 2.5ghz, automotive wifi front end module the rffm3842q fem is a single-chip integrated front end module (fem) for automotive wifi. the fem addre sses the need for aggressive size reduction for a typical 802.11b/g/n fr ont end design and greatly reduces the number of components outside of the core chipset. the front end module has integrated b/g/n power am plifier, directional power detector, rx balun, and some tx filtering. it is also capable of switching between wifi rx, wifi tx and bth rx/tx operations. the device is provided in a 3mm x 3mm x 0.45mm, 16-pin package. this module meets or exceeds the rf front end needs of 802.11b/g/n wifi rf systems. features ? single voltage supply 3.3v to 4.2v ? integrated 2.5ghz b/g/n amplifier, rx balun and tx/rx switch and directional power detector ? p out = 17dbm, 11g, ofdm at ? 2.4% evm and p out = 21.5dbm, meeting 11b mask applications automotive wifi ? diagnostic ? data ? infotainment rffm3482qtr13x standard 1 piece rffm3482qsq standard 25 piece bag rffm3482qsr standard 100 piece bag RFFM3482QTR7 standard 2500 piece reel rffm3482qpck-41xfully assembled evaluation board and 5 loose sample pieces ds121108 package style: qfn, 16-pin, 3mm x 3mm x 0.45mm
2 of 13 rffm3482q ds121108 7628 thorndike road, greensboro, nc 27409-9421 for sales or technical support, contact rfmd at (+1) 336-678-5570 or customerservice@rfmd.com . nominal operating parameters bm absolute maximum ratings parameter rating unit dc supply voltage 5.6 v dc full specification temp range (full spec. compliant) -40 to +85 c storage temperature -40 to +150 c maximum tx input power for 11b (no damage) +10 dbm maximum tx input power for 11g (no damage) +10 dbm moisture sensitivity msl2 parameter specification unit condition min. typ. max. 2.4ghz transmit parameters compliance ieee802.11b, ieee802.11g, fcc cfg 15.247, .205, .209 nominal conditions v cc = 3.6v, paen = 1.8v pulsed at 1% to 100% duty cycle, temp = +25c, freq = 2.4ghz to 2.5ghz, unless otherwise noted frequency 2.4 2.5 ghz output power 11g 15 17 dbm 54mbps, ofdm, 64qam meeting evm requirement 1 11b 19.5 21.5 dbm measured at 1mbps meeting acp1/acp2 require- ments 11n 13.5 16 dbm mcs7, ofdm evm* 11g 2.4 3.5 % rms, mean, p out(g) = 15dbm evm* 11n 2.2 2.8 % rms, mean, p out(n) = 13.5dbm acp1 -36 -31 dbc p out = 19.5dbm, ieee802.11b, 11mbps cck, 1mbps bpsk modulation acp2 -56 -51 dbc gain 26.5 33 38 db gain variation -3 +3 db over temperature and voltage frequency -1.0 +1.0 db 2.4ghz to 2.5ghz *the evm specification is obtained with a signal generator that has an evm level <0.7%. 1. with v cc >3.0v to 3.3v there will be a 0.5db degradation in 11g linear output power. 2. the typical parameters are at nominal conditions. min/max parameters are over all conditions. caution! esd sensitive device. exceeding any one or a combination of the absolute maximum rating conditions may cause permanent damage to the device. ex tended application of absolute maximum rating conditions to the device may reduce device reliability. specified typical perfor- mance or functional operation of the devi ce under absolute maximum rating condi- tions is not implied. the information in this publication is believed to be accurate and reliable. however, no responsibility is assumed by rf micro devices, inc. ("rfmd") for its use, nor for any infringement of patents, or other rights of third parties, resulting from its use. no license is granted by implication or otherwise under any patent or patent rights of rfmd. rfmd reserves the right to change component circuitry, recommended appli- cation circuitry and specifications at any time without prior notice. rfmd green: rohs compliant per eu directive 2002/95/ec, halogen free per iec 61249-2-21, < 1000ppm each of antimony trioxide in polymeric materials and red phosphorus as a fl ame retardant, and <2% antimony in solder.
3 of 13 rffm3482q ds121108 7628 thorndike road, greensboro, nc 27409-9421 for sales or technical support, contact rfmd at (+1) 336-678-5570 or customerservice@rfmd.com . parameter specification unit condition min. typ. max. 2.4ghz transmit parameters (continued) power detect voltage detect 0 0.8 v < 21dbm output power p out = 16dbm 0.260 0.31 0.380 v ieee802.11g, 54mbps 64qam modulation input resistance 10 k ? input capacitance 5 pf bandwidth 800 1000 khz sensitivity 0dbm to 7dbm 2 mv/db 8dbm to 15dbm 10 mv/db > 15dbm 20 mv/db current consumption ieee802.11g i cc 140 160 180 ma rf p out = 15dbm, 54mbps ieee802.11g ieee802.11b i cc 200 220 240 ma rf p out = 19.5dbm, 11mbps ieee802.11b i paen 240 400 ? apa en = high leakage 2 6 ? av b <4.0v all control inputs = ?off?, no rf at 25c 25 ? av b <4.0v all control inputs = ?off?, no rf at 85c power supply 3.3 3.6 4.2 v pa en voltage on 1.6 1.8 2.0 v pa is turned on pa en voltage off 0 v pa is turned off pabc voltage 0 1.0 v used to drive the pabc current pabc current 0 1.8 ma input/output impedance 50 ? output load vswr ruggedness no damage or permanent degradation to device vswr = 10:1; all phase angles (v ramp set for p out < 22dbm into 50 ? load; load switched to vswr = 10:1) out of band gain (s 21 )at 50 ? relative to minimal in-band gain 86mhz to 108mhz 30 dbr 776mhz to 894mhz 20 dbr 925mhz to 980mhz 20 dbr 1570mhz to 1580mhz 20 dbr 1805mhz to 1880mhz 20 dbr 1930mhz to 1990mhz 20 dbr 2110mhz to 2170mhz 15 dbr harmonics rbw = 1mhz. measured in cw. second -30 dbc 4.80ghz to 5.00ghz third -50 dbc 7.20ghz to 7.50ghz fourth -60 dbc 2.4ghz receive parameters frequency 2.4 2.5 ghz insertion loss 2.1 2.5 db switch and balun noise figure 2.5 db passband ripple 0.3 db output return loss -9 db output impedance 100 ? no external matching
4 of 13 rffm3482q ds121108 7628 thorndike road, greensboro, nc 27409-9421 for sales or technical support, contact rfmd at (+1) 336-678-5570 or customerservice@rfmd.com . isolation table switch control logic parameter specification unit condition min. typ. max. 2.4ghz receive parameters (continued) balun amplitude balance -1 1 db phase balance -10 10 relative to 180 bluetooth parameters frequency 2.4 2.5 ghz insertion loss 1.0 1.5 db sp3t switch, all unused ports terminated into their nominal impedance passband ripple -0.3 +0.3 db input/output power p1db 20 dbm output return loss -12 -10 db output impedance 50 ? no external matching general characteristics turn-on/off time 1.0 ? s output stable to within 90% of final gain antenna port impedance input 50 ? receive output 50 ? transmit switch control voltage low 0 0.1 v high 1.6 2.0 v switch control current 4 ? a per control lines, tx, rx and bt switch control speed 100 nsec per control line tx esd human body model 500 v eia/jesd22-114a charge device model 750 v eia/jesd22-c101 *the evm specification is obtained with a signal generator that has an evm level <0.7%. parameter min. typ. max. unit wifi rx to bt rx/tx 22 29 db wifi tx to bt rx/tx 22 25 db wifi rx to wifi tx 20 38 db ant tx 25 45 db ant rx 25 28 db mode btw_sw rx_sw tx_sw pa_en bluetooth 1000 wifi tx 0011 wifi rx 0100 simultation bt/rx1100 calibration 0101 1001 1101
5 of 13 rffm3482q ds121108 7628 thorndike road, greensboro, nc 27409-9421 for sales or technical support, contact rfmd at (+1) 336-678-5570 or customerservice@rfmd.com . pin names and descriptions pin name description 1txb rf input for the 802.11b/g/n pa. input is matched to 50 ? and dc block is provided. 2gnd ground. 3bt rf bidirectional port for bluetooth. input is matched to 50 ? and dc block is provided. 4paen digital enable pin for the 802.11b/g/n pa. this is an active high control. an external bypass capacitor may be needed on the pa en line for decoupling purposes. 5vb supply voltage for the 802.11b/g/n pa. 6vb supply voltage for the 802.11b/g/n pa. 7pabc linearity and efficiency control pin, please see the theory of operation for more information. 8pdet power detector voltage for tx section. pdet voltage varies with output power. may need external decoupling capacitor for module stability. may need external circuitry to bring output voltage to desired level. 9vb supply voltage for the 802.11b/g/n pa. 10 tx sw switch control port. see switch truth table for proper level. 11 rx sw switch control port. see switch truth table for proper level. 12 bth sw switch control port. see switch truth table for proper level. 13 ant fem connection to filter and antenna. port is matched to 50 ? and dc block is provided. 14 gnd ground. 15 rx+ receive port for 802.11b/g/n band. internally matched to 100 ? differential. dc block provided. 16 rx- receive port for 802.11b/g/n band. internally matched to 100 ? differential. dc block provided. pkg base gnd the center metal base of the qfn package provides dc and rf ground as well as heat sink for the front end module.
6 of 13 rffm3482q ds121108 7628 thorndike road, greensboro, nc 27409-9421 for sales or technical support, contact rfmd at (+1) 336-678-5570 or customerservice@rfmd.com . package drawing qfn, 16-pin, 3mm x 3mm x 0.45mm notes: 1. dimension applies to metallized terminal and is measured 0.25mm and 0.30mm from terminal tip. 2. dimension represents terminal pull back from pacikage edge up to 0.1mm is acceptable. 3. coplanarity applies to the exposed heat slug as well as hte terminal. . y
7 of 13 rffm3482q ds121108 7628 thorndike road, greensboro, nc 27409-9421 for sales or technical support, contact rfmd at (+1) 336-678-5570 or customerservice@rfmd.com . pin out 5 6 7 8 9 10 11 12 2 3 4 1 3 ? mm ? x ? 3 ? mm ? x ? 0.45 ? mm 16 15 14 13 txb gnd bt paen vb vb pabc pdet tx ? sw vb bth ? sw rx ? sw gnd ant rxbn rxbp
8 of 13 rffm3482q ds121108 7628 thorndike road, greensboro, nc 27409-9421 for sales or technical support, contact rfmd at (+1) 336-678-5570 or customerservice@rfmd.com . application schematic 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 paen vbatt pabc tx sw vbatt bt sw u1 rf3482 50 ? ? strip j1 tx 50 ? ? strip j2 bt c1 1.5nf pdet l1 3.3nh c3 1.5nf rx sw 50 ? ? strip j5 ant 50 ? ? strip j4 +rx 50 ? ? strip j3 -rx c2 1uf
9 of 13 rffm3482q ds121108 7628 thorndike road, greensboro, nc 27409-9421 for sales or technical support, contact rfmd at (+1) 336-678-5570 or customerservice@rfmd.com . evaluation board schematic 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 paen vbatt pabc tx sw vbatt bt sw u1 rf3482 50 ? ? strip j1 tx 50 ? ? strip j2 bt c1 1nf pdet l2 3.3nh c2 1uf (402) rx sw 50 ? ? strip j5 ant 50 ? ? strip j4 +rx 50 ? ? strip j3 -rx l1 0 ?
10 of 13 rffm3482q ds121108 7628 thorndike road, greensboro, nc 27409-9421 for sales or technical support, contact rfmd at (+1) 336-678-5570 or customerservice@rfmd.com . theory of operation the rffm3482q fem is a single-chip integrated front end module (fem) for high performance wifi applications in the 2.4ghz to 2.5ghz ism band. the fem addresses the need for aggressive size reduction for a typical 802.11b/g/n rf front end design, and greatly reduces the number of components outside of the core chipset. therefore, the footprint and assembly cost of the overall 802.11b/g/n solution is minimized. the fem has integrated b/g/n power amplifier, power detector, rx balun, and tx fil- tering. also, it is capable of switching between wifi rx, wifi tx, and bth rx/tx operations. it has low insertion loss at the 2.4ghz to 2.5ghz wifi and bth paths. the device is manufa ctured in a gaas phemt processes, and provided in a 3mm x 3mm x 0.45mm, 16-pin package. this module meets or exc eeds the rf front end needs of 802.11b/g/n wifi rf systems. for best results, the pa circuit layout fr om the evaluation board should be copied as closely as possible, particularly the gro und layout and ground vias. other configurations may also work, but the design process is much easier and quicker if the layout is copied from the rffm3482q evaluation board. there is an indica tor pin labeled p1 id that should be left as a no-connect on the pcb. this pin is directly connected to the ground pad of th e ic. for the best performance, it is recommended that voltage and rf lines do not cross under this pin. gerber files of rfmd pcba designs can be provided on request. the supply voltage lines should present an rf short to the fem by using bypass ca pacitors on the vb traces. the rffm3482q is a very easy part to implement, but care in circuit layout and component select ion is always advisable when designing circuits to operate at 2.5ghz. please contact rfmd sales or applicatio n engineering for additional data and guidance. the rffm3482q is designed primarily for ieee802.11 b/g/n wifi applications where the available supply voltage and current are limited. the rffm3482q requires a single positive supply voltage (vb), pa enable (pa_en) supply, efficiency control (pabc), and a positive supply for switch control to simplify bias requirements. the rffm3842q fem also has built in power detection. all inputs and output s are internally matched to 50 ? except the wifi receive path it is deferential with nominal impedance of 100 ? on each pin. 802.11b/g/n transmit path the rffm3482q has a typical gain of 33db from 2.4ghz to 2.5ghz, and delivers 16.5dbm typical output power under 54mbps ofdm modulation, and 21dbm under 1mbps 11b modulation. the rffm3482q requires a single positive supply of 3.3v to 4.2v to operate at full specifications. pa control for the 802.11b/g/n band is provided through one bias control input pin (pa_en). the pa_en pin requires a regulated supply to maintain nominal bias current. in general, the pabc pin controls acts as an efficiency and linearity control pin. the current or voltage applied at this pin may produce higher linear output power, higher operating current, and higher gain. out of band rejection the rffm3482q contains basic filtering components to produce bandpass responses for the wifi transmit path. due to space constraints inside the module, filtering is limited to a few resonant poles on the rf path. 802.11b/g/n receive path the 802.11b/g/n path has a100 ? differential impedance with a nominal insertion loss of 2.1db. the rx port return loss is -9db maximum. depending on the application, if filtering is required beyond what the rffm3482q can achieve then additional external filters will need to be added outside of the rffm3482q.
11 of 13 rffm3482q ds121108 7628 thorndike road, greensboro, nc 27409-9421 for sales or technical support, contact rfmd at (+1) 336-678-5570 or customerservice@rfmd.com . rffm3842q biasing instructions: ? 802.11b/g/n transmit (vb compliance = 5.5v, 400ma, pa en compliance = 2v, ~450ma) ? connect the fem to a signal generator at the input and a spectrum analyzer at the output. ? bias vb to 3.6v first with pa_en = 0.0v ? refer to switch operational truth table to set th e control lines at the proper levels for wifi tx. ? turn on pa_en to 1.8v (typ.). be extremely careful not to exc eed 3.0v on the pa_en pin, or the part may exceed device cur- rent limits. ? turn on pabc to 1.5ma (or 0.6v). for 11b operation adjust pabc to 1.8ma. this controls the current drawn by the 802.11b/g/n power amplifier and the idle current should rise to ~115ma 20ma for a typical part, but it varies based on the output power desired. ? 802.11 b/g/n receive: to receive wifi set the switch control lines per the truth table below. ? bluetooth receive: to receive bluetooth set the switch control lines per the truth table below. i bias table wifi pabc standard modulation units ieee 802.11b cck 1.8 ma ieee 802.11g 54ofdm 1.5 ma ieee 802.11n mcs7 1.6 ma
12 of 13 rffm3482q ds121108 7628 thorndike road, greensboro, nc 27409-9421 for sales or technical support, contact rfmd at (+1) 336-678-5570 or customerservice@rfmd.com . pcb design requirements pcb surface finish the pcb surface finish used for rfmd's qualification process is electroless nickel, immersion gold. typical thickness is 3 micr o- inch to 8 micro-inch gold over 180 micro-inch nickel. pcb land pattern recommendation * pcb land patterns for rfmd components are based on ipc-735 1 standards and rfmd empirica l data. the pad pattern shown has been developed and tested for optimized assembly at rf md. the pcb land pattern has been developed to accommodate lead and package tolerances. since surface mount processes va ry from company to company, careful process development is recommended. pcb metal land pattern 6x 0.250 pcb metal pattern 6x 0.250 8x 0.300 8x 0.300 4x 1.300 2x 0.750 2x 0.250 2x 0.250 2x 0.750 4x 1.300 4x 1.300 2x 0.750 2x 0.250 0.000 4x 1.300 2x 0.750 2x 0.250 0.000
13 of 13 rffm3482q ds121108 7628 thorndike road, greensboro, nc 27409-9421 for sales or technical support, contact rfmd at (+1) 336-678-5570 or customerservice@rfmd.com . pcb solder mask pattern liquid photo-imageable (lpi) so lder mask is recommended. the solder mask fo otprint will match what is shown for the pcb metal land pattern with a 2 mil to 3 mil expansion to accommodate solder mask registration clearance around all pads. the center-grounding pad shall also have a solder mask clearance. expansion of the pads to create solder mask clearance can be provided in the master data or requ ested from the pcb fabrication supplier. thermal pad and via design the pcb land pattern has been designed with a thermal pad th at matches the die paddle size on the bottom of the device. thermal vias are required in the pcb layout to effectively conduct heat away from the package. the via pattern has been designed to address thermal, power dissipa tion and electrical requirements of the device as well as accommodating routing strategies. the via pattern used for the rfmd qualification is based on thru -hole vias with 0.203mm to 0.330mm finished hole size on a 0.5mm to 1.2mm grid pattern with 0.025mm plating on via walls. if micro vias are used in a design, it is suggested that the quantity of vias be increased by a 4:1 ratio to achieve similar results. pcb solder mask pattern 6x 0.130 6x 0.130 8x 0.180 8x 0.180 4x 1.300 2x 0.750 2x 0.250 2x 0.250 2x 0.750 4x 1.300 4x 1.300 2x 0.750 2x 0.250 0.000 4x 1.300 2x 0.750 2x 0.250 0.000

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