1 of 9 optimum technology matching ? applied gaas hbt ingap hbt gaas mesfet sige bicmos si bicmos sige hbt gaas phemt si cmos si bjt gan hemt 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 bifet hbt ? rfsa2624 serial controlled digital step attenuator 50mhz to 4000mhz, 6-bit, 0.5db rfmd?s rfsa2624 is a 6-bit digital step attenuator (dsa) that features high linear- ity over the entire 31.5db gain control ra nge with excellent step accuracy in 0.5db steps. the rfsa2624 is programmed via a serial mode control interface that is both 3v and 5v compatible. the rfsa2624 also offers a rugged class 1b hbm esd rating via on-chip esd circuitry. the mcm package is footprint compatible with most 24-pin, 4mm, qfn packages. features ? frequency range 50mhz to 4000mhz ? 6-bits, 31.5db range, 0.5db step ? high linearity, oip3 >48dbm through over 700mhz to 2700mhz ? 3v and 5v logic compatible ? serial-to-parallel controller ? serial programming interface ? power-up programming modes ? on-chip esd prot ection >500v hbm ? single supply, 3v to 5v operation ? footprint compatible with most 24-pin, 4mm qfns applications ? transceiver if applications ? cellular, pcs, gsm, umts, lte, wimax/wifi ? wireless data, satellite terminals ? test equipment ds110706 ? package: mcm, 24-pin, 4.2mm x 4.2mm rfsa2624 serial con- trolled digital step attenua- tor 50mhz to 4000mhz, 6- bit, 0.5db lsb rfsa2624sr 7? reel with 100 pieces rfsa2624sq sample bag with 25 pieces rfsa2624tr7 7? reel with 750 pieces rfsa2624tr13 13? reel with 2500 pieces RFSA2624PCK-410 50mhz to 4000mhz pcba with 5-piece sample bag
2 of 9 rfsa2624 ds110706 7628 thorndike road, greensboro, nc 27409-9421 for sales or technical support, contact rfmd at (+1) 336-678-5570 or customerservice@rfmd.com . absolute maximum ratings parameter rating unit supply voltage +5.5 v dc supply current 15 ma power dissipation 83 mw max rf input power 27 dbm operating temperature (t case )-40 to +85c storage temperature -40 to +150 c junction temperature 150 c esd rating (hbm) class 1b moisture sensitivity level msl3 parameter specification unit condition min. typ. max. frequency range 50 4000 mhz insertion loss 1.5 db 150mhz, 0db attenuation 1.7 1.9 db 850mhz, 0db attenuation 2.3 db 2700mhz, 0db attenuation 2.5 2.8 db 3800mhz, 0db attenuation gain control range 31.5 db 0.5db step size step accuracy (0.15 + 5.0% attenuation setting) db input ip3 (0 - 15.5db states) 48 dbm 700mhz to 2700mhz, all states input p1db 27 dbm 700mhz to 2700mhz, all states return loss 13 db 700mhz to 2700mhz, all states control interface 6 bit serial interface settling time 250 ns t rise , t fall (10%/90% rf) switching speed 250 ns t on , t off (50% ctl to 10%/90% rf) supply voltage (v dd ) 4.75 5.0 5.25 v supply current 5 ma control voltage (v ctl )0 0.8vlow 2.0 v dd vhigh notes: 1. v dd = 5v, v ctl = 3v, t = 25c 2. broadband application ci rcuit (with acg capacitors) 3. iip3 measured with p in = +10dbm/tone, 1mhz spacing 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 9 rfsa2624 ds110706 7628 thorndike road, greensboro, nc 27409-9421 for sales or technical support, contact rfmd at (+1) 336-678-5570 or customerservice@rfmd.com . typical performance - broadband application circuit (25c) insertion loss (de-embedded) -4.0 -3.5 -3.0 -2.5 -2.0 -1.5 -1.0 -0.5 0.0 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 frequency (ghz) insection loss (db) 25c -40c 85c normalized attenuation, majorstates -40 -35 -30 -25 -20 -15 -10 -5 0 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 frequency (ghz) attenuation (db) 0.5 1 2 4 8 16 31.5 return loss of rf1, majorstates -40 -35 -30 -25 -20 -15 -10 -5 0 00.511.522.533.54 frequency (ghz) return loss (db) 0 0.5 1 2 4 8 16 31.5 return loss of rf2, majorstates -40 -35 -30 -25 -20 -15 -10 -5 0 00.5 11.522.5 33.54 frequency (ghz) return loss (db) 0 0.5 1 2 4 8 16 31.5 step error, majorstates -0.8 -0.6 -0.4 -0.2 0.0 0.2 0.4 0.6 0.8 0 0.5 1 1.5 2 2.5 3 3.5 4 frequency (ghz) step error (db) 0.5 1 2 4 8 16 31.5 step error vs. attenuation state -0.8 -0.6 -0.4 -0.2 0.0 0.2 0.4 0.6 0.8 048121620242832 attenuation (db) step error(db) 50mhz 500mhz 1ghz 2ghz 3ghz 4ghz
4 of 9 rfsa2624 ds110706 7628 thorndike road, greensboro, nc 27409-9421 for sales or technical support, contact rfmd at (+1) 336-678-5570 or customerservice@rfmd.com . typical performance - broadband application circuit (25c) (continued) relative phase, majorstates -20 -10 0 10 20 30 40 50 60 0 0.5 1 1.5 2 2.5 3 3.5 4 frequency (ghz) relative phase (deg) 0.5 1 2 4 8 16 31.5 worst case successive step error -0.6 -0.4 -0.2 0.0 0.2 0.4 0.6 0.8 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 frequency(ghz) error(db)
5 of 9 rfsa2624 ds110706 7628 thorndike road, greensboro, nc 27409-9421 for sales or technical support, contact rfmd at (+1) 336-678-5570 or customerservice@rfmd.com . truth table note: c 0.5 = d0, c1 = d1, ... c16 = d5 (for the purpose of the example below) serial port interface control bit relative gain setting c16c8c4c2c1c0.5 111111 max gain 111110-0.5db 111101 -1db 111011 -2db 110111 -4db 101111 -8db 011111-16db 000000-31.5db spi timing diagram specifications parameter limit unit comment logic voltage levels t1 25 mhz max clk frequency state logic t2 20 ns min clk high low 0v to 0.8v t3 20 ns min clk low high 2.0v to 5.0v t4 5 ns min data to clk setup time t5 5 ns min data to clk hold time t6 30 ns min data valid t7 5 ns min le to clk setup time t8 5 ns min clk to le setup time t9 10 ns min le pulse width t10 20 ns min output set clk data t6 le t1 t2 t3 t4 t5 t7 t8 dout t9 spi timing diagram t10 programming example ? 6-bit msb lsb d4 d3 d2 d0 d1 d5 clk data le
6 of 9 rfsa2624 ds110706 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 description pin name description 1gnd dc and rf ground. 2vdd power supply. 3gnd dc and rf ground. 4rf1 rf port. external dc block required. 5gnd dc and rf ground. 6acg ac ground for operation below 500mhz; leave unconnected above 500mhz. 7acg ac ground for operation below 500mhz; leave unconnected above 500mhz. 8acg ac ground for operation below 500mhz; leave unconnected above 500mhz. 9acg ac ground for operation below 500mhz; leave unconnected above 500mhz. 10 acg ac ground for operation below 500mhz; leave unconnected above 500mhz. 11 acg ac ground for operation below 500mhz; leave unconnected above 500mhz. 12 gnd dc and rf ground. 13 acg ac ground for operation below 500mhz; leave unconnected above 500mhz. 14 gnd dc and rf ground. 15 rf2 rf port. external dc block required. 16 gnd dc and rf ground. 17 gnd dc and rf ground. 18 gnd dc and rf ground. 19 nc no internal connection. evb can be ground or no connect. 20 pup power-up programming pin. low=max attenuation (31.5db) at power-up, high=min attenuation (0db) at power-up. 21 clk serial clock. 22 le latch enable. 23 nc no internal connection. evb can be ground or no connect. 24 data serial data. epad gnd dc and rf ground. must be soldered to evb ground plane over a bed of vias for thermal and rf performance. power-up programming truth table pup attenuator setting low attenuation at max, 31.5db high attenuation at min, 0db
7 of 9 rfsa2624 ds110706 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 assembly drawing
8 of 9 rfsa2624 ds110706 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 c0.25 1 vdd 2 gnd/nc 3 rf1 4 gnd/nc 5 nc 6 gnd/nc 7 gnd/nc 8 gnd/nc 9 gnd/nc 10 gnd/nc 11 gnd/nc 12 nc 13 gnd/nc 14 rf2 15 gnd/nc 16 gnd/nc 17 gnd/nc 18 c16 19 c8 20 c4 21 c2 22 c1 23 c0.5 24 u1 c7 c6 c5 c4 c3 c2 c1 gnd gnd gnd gnd gnd gnd gnd c05/data c05/data c1 c1 c2/le c2/le c4/clk c4/clk c8/pup c8/pup c16 c16 vdd vdd gnd c13 gnd c15 gnd c16 gnd c14 gnd gnd gnd gnd gnd gnd c11 c12 gnd gnd gnd gnd c17 gnd c18 gnd c19 c20 c025 c9 gnd c025 r3 r2 r1 r4 r6 r7 r5 1 2 3 4 5 6 7 8 9 p1 con9 r8 c8 gnd 1 2 j1 rf1 1 2 j2 rf2 1 2 j99 sma 1 2 j100 sma cb2 12 txd 1 dtr# 2 rts# 3 vio 4 rxd 5 ri# 6 gnd 7 dsr# 8 dcd# 9 cts# 10 cb4 11 gnd 24 sld 13 usb 14 vcc 15 pu2 16 pu1 17 cb3 18 3v3 19 rst 20 vcc 21 cb1 22 cb0 23 p2 um232r c025 c4/clk c1 c05/data gnd c8/pup c16 c2/le
9 of 9 rfsa2624 ds110706 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 bill of materials (bom) package drawing description reference designator manufacturer manufacturer's p/n rfsa2714 evaulation board pcb itself dynamic details (ddi) toronto sa2714410(a) 6-bit, serial, 0.5db step attenuator u1 rfmd rfsa2624sb cap, 680pf, 10%, 50v, x7r, 0402 c13, c15-c17 murata electronics n. america grm155r71h681ka01e cap, 1000pf, 10%, 50v, x7r, 0402 c7 taiyo yuden (usa), inc. rm umk105bj102kv-f cap, 0.1f, 10%, 10v, x5r, 0402 c11-c12 taiyo yuden (usa), inc. rm lmk105bj104kv res, 0 ? , 0402 r1-r2, r4-r5, r8 kamaya, inc rmc1/16sjpth conn, sma, end lnch, univ, hyb mnt, flt j1-j2, j99-j100 molex sd-73251-4000 conn, hdr, st, plrzd, 9-pin p1 itw pancon mpss100-9-c conn, skt, 24-pin dip, .600", t/h p2 aries electronics inc. 24-6518-10 mod, usb to serial uart, ssop-28 m1 (see note below) future technology devices int'l um232r dnp c1-c6, c8-c9, c14, c18-c20 na na dnp r3, r6, r8 na na note: m1 is to be mounted into p2 with respect to the pin 1 alignment of m1 and p2
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