rf micro devices inc . 7628 thorndike road, greensboro, nc 27409 - 9421 ds1 5 01 28 for sales or technical support, contact rfmd at +1.336.678.5570 or customerservice@rfmd.com . rf micr o devices ? and rfmd ? are trademarks of rfmd, llc. bluetooth is a trademark owned by bluetooth sig, inc., u.s.a. and licensed for use by rfmd. all other trade names, trademarks, and registered trademarks are the property of their respective owners. ?2013, rf micro devices, inc. 1 of 8 rffm8250 2.4ghz to 2.5ghz 802.11b/g/n/ac wifi switch + lna mo dule the rffm8250 provides a complete integrated switch + lna solution in a single front end module (fem) for wifi 802.11b/g/n/ac and bluetooth ? systems. the ultra - small form factor and integrated matching greatly reduces the number of external components and layout area in the customer applications. this simplifies the total front end solution by reducing the bill of materials, system footprint, and manufacturing cost. the rffm8250 integrates a single pole three throw (sp3t) transmit/receive (t/r) switch and a 2.5ghz low noise amplifier (lna) with bypass mode. the device is provided in a 1.75mm x 1.75mm x 0.33 mm 1 0- pin qfn package. tx vtx n/c 2 3 4 5 6 7 8 9 10 bt ant vrx vbt vdd lnaen rx 1 functional block diagram ordering information rffm8250 sb standard 5 - piece sample bag rffm8250 sq standard 25 - piece sample bag rffm8250 sr standard 100 - piece reel rffm8250 tr7 standard 2500 - piece reel rffm8250 pck - 410 fully assembled evaluation board w/ 5 - piece bag package: qfn, 10 - pin, 1.75mm x 1.75 mm x 0.33 mm features sp3t t/r switch with bluetooth support lna with bypass mode input and output matched to 50? wide voltage supply range supports wifi chipsets with integrated power amplifier (ipa) low profile package for module designs applications cellular handsets mobile devices tablets consumer electronics gaming netbooks/notebooks tv/monitors/video rffm8250
rf micro devic es inc . 7628 thorndike road, greensboro, nc 27409 - 9421 ds1 5 01 28 for sales or technical support, contact rfmd at +1.336.678.5570 or customerservice@rfmd.com . the information in this publication is believed to be accurate. however, no responsibility is assumed by rf micro devices, in c. ("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 application circuitry and specifications at any time without prior notice. 2 of 8 rffm8250 absolute maximum rat ings parameter rating unit dc supply voltage (no rf applied) - 0.5 to 6 v dc supply current 100 ma operating case temperature - 40 to +85 c storage temperature - 40 to +150 c maximum tx input power into 50? load for 11b/g/n/ac (no damage) +30 dbm maximum rx input power (no damage) + 10 dbm bypass mode maximum rx input power (no damage) +2 3 dbm moisture sensitivity msl2 caution! esd sensitive device. rfmd green: rohs status based on eu directive 2011/65/eu (at time of this document revision) , halogen free per iec 61249 -2- 21, < 1000ppm each of antimony trioxide in polymeric materials and red phosphorus as a flame retardant, and <2% antimony in solder. exceeding any one or a combination of the absolute maximum rating conditions may cause permanent damage to the device. extended application of absolute maximum rating conditions to the device may reduce device reliability. specified typical performance or functional operation of the device under absolute maximum rating conditions is not implied. n ominal operating parameters parameter specification unit condition min typ max compliance 802.11b, 802.11g, 802.11n, 802.11ac operating frequency 2.412 2.484 ghz operating temperature - 40 25 85 c power supply v dd 3. 0 3.6 5.0 v control voltage - high 2.8 3.1 v dd v vtx, vrx, lnaen, and vbt should not exceed v cc voltage control voltage - low 0 0. 2 v transmit (tx - ant) v dd = 3.6v over frequency, unless otherwise noted insertion loss 0. 6 1.2 db t = 25 c, v dd = 3.6v tx port return loss 12 20 db ant port return loss 12 20 db input p1db 27 30 dbm t = 25 c, v dd = 3.6v ant - rx isolation 28 3 5 db tx is enables and at max power receive (ant - rx) - lna on v dd = 3.6v , over frequency, unless otherwise noted gain (s21) 11 1 3 16 db t = 25c, v dd = 3.6v 10 13 17 db t = - 40 to +85 c , v dd = 3.0 v to 5v gain flatness over any 20mhz bw - 0.25 +0.25 db gain flatness across band - 0.5 +0.5 db noise figure 2. 3 2.7 db t = 25c, v dd = 3.6v rx port return loss 1 5 10 db ant port return loss 5 3 db t = 25c, v dd = 3.6v input p1db - 7 - 5 dbm current consumption 6 9 13 ma lna_en control current 2 50 5 00 a lna turn on time 200 500 ns
rf micro devic es inc . 7628 thorndike road, greensboro, nc 27409 - 9421 ds1 5 01 28 for sales or technical support, contact rfmd at +1.336.678.5570 or customerservice@rfmd.com . the information in this publication is believed to be accurate. however, no responsibility is assumed by rf micro devices, in c. ("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 application circuitry and specifications at any time without prior notice. 3 of 8 rffm8250 parameter specification unit condition min typ max receive (ant - rx) - bypass mode v dd = 3.6v, unless otherwise noted insertion loss 5 7 10 db t= 25c, v dd = 3.6v rx port return loss 10 8 db ant port return loss 10 8 db input p1db 17 + 21 dbm bluetooth tx/rx v dd = 3.6 , unless otherwise noted input p1db 25 +27 dbm t = 25c, v dd = 3.6v insertion loss 0. 6 1.3 db bt port return loss 12 20 db ant port return loss 12 20 db general specifications control line impedance - vtx 40 m? control line impedance ? lna en 65 k? control line impedance - vrx 40 m? control line impedance - vbt 40 m? v dd leakage current 1 10 a switch control current - high - each line 1 10 a switch control current - low - each line 0.1 1 a switching speed 100 500 ns esd - human body model 1000 v esd - charge device model 1000 v
rf micro devic es inc . 7628 thorndike road, greensboro, nc 27409 - 9421 ds1 5 01 28 for sales or technical support, contact rfmd at +1.336.678.5570 or customerservice@rfmd.com . the information in this publication is believed to be accurate. however, no responsibility is assumed by rf micro devices, in c. ("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 application circuitry and specifications at any time without prior notice. 4 of 8 rffm8250 switch control logic truth table operating mode vtx lnaen vrx vbt standby low low low low 802.11b/g/n/ac tx mode high low low low 802.11b/g/n/ac rx gain low high high low 802.11b/g/n/ac rx bypass low low high low bt rx/tx low low low high notes: ? high = 2.8 to v cc . low = 0v to 0.2v. timing diagram
rf micro devic es inc . 7628 thorndike road, greensboro, nc 27409 - 9421 ds1 5 01 28 for sales or technical support, contact rfmd at +1.336.678.5570 or customerservice@rfmd.com . the information in this publication is believed to be accurate. however, no responsibility is assumed by rf micro devices, in c. ("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 application circuitry and specifications at any time without prior notice. 5 of 8 rffm8250 applications schematic
rf micro devic es inc . 7628 thorndike road, greensboro, nc 27409 - 9421 ds1 5 01 28 for sales or technical support, contact rfmd at +1.336.678.5570 or customerservice@rfmd.com . the information in this publication is believed to be accurate. however, no responsibility is assumed by rf micro devices, in c. ("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 application circuitry and specifications at any time without prior notice. 6 of 8 rffm8250 pin out tx vtx n/c 2 3 4 5 6 7 8 9 10 bt ant vrx vbt vdd lnaen rx 1 package drawing
rf micro devic es inc . 7628 thorndike road, greensboro, nc 27409 - 9421 ds1 5 01 28 for sales or technical support, contact rfmd at +1.336.678.5570 or customerservice@rfmd.com . the information in this publication is believed to be accurate. however, no responsibility is assumed by rf micro devices, in c. ("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 application circuitry and specifications at any time without prior notice. 7 of 8 rffm8250 pcb patterns note: thermal vias for center slug ?c? should be incorporated into the pcb design. the number and size of thermal vias will depend on the application, power, dissipation and electrical requirements. example of the number and size of vias can be found on the rfmd evaluation board layout (gerber files are available upon request)
rf micro devic es inc . 7628 thorndike road, greensboro, nc 27409 - 9421 ds1 5 01 28 for sales or technical support, contact rfmd at +1.336.678.5570 or customerservice@rfmd.com . the information in this publication is believed to be accurate. however, no responsibility is assumed by rf micro devices, in c. ("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 application circuitry and specifications at any time without prior notice. 8 of 8 rffm8250 pin names and descriptions pin name description 1 vtx transmit switch control pin. see switch truth table for proper level. 2 tx rf input port for the 802.11b/g/n pa. input is matched to 50?. an external dc block is required. 3 n/c no connect. this pin is not connected internally and can be left floating or connected to ground. 4 rx rf output port for the 802.11b/g/n lna. port is matched to 50?. this pin is dc blocked internally. rf bidirectional port for bluetooth?. input is matched to 50?. an external dc block is required. rf bidirectional antenna port matched to 50?. an external dc block is required.
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