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voltage variable rf attenuator 1mhz to 3000mhz voltage variable rf attenuator 1 rev o, july 2015 idtf2255nlgk datasheet g eneral d escription the idtf2255 is a low insertion loss v oltage v ariable rf a ttenuator (vva) designed for a multitude of wireless and other rf applications. this device co vers a broad frequency range from 1mhz to 3000mhz. in addition to providing low insertion loss, the idtf2 255 provides excellent linearity performance over its e ntire voltage control and attenuation range. the f2255 uses a single positive supply voltage of 3.15v to 5.25v. other features include the v mode pin allowing either positive or negative voltage contro l slope vs attenuation and multidirectional operatio n meaning the rf input can be applied to either rf1 o r rf2 pins. control voltage ranges from 0v to 3.6v using either positive or negative control voltage s lope. c ompetitive a dvantage idtf2255 provides extremely low insertion loss and superb ip3, ip2, return loss and slope linearity ac ross the control range. comparing to competitive vvas t his device is better as follows: operation down to 1mhz insertion loss @ 500mhz: 1.1db maximum attenuation slope: 33db/volt minimum output ip3: 35dbm minimum input ip2: 74dbm high operating temperature: +105c a pplications ? base station 2g, 3g, 4g, ? portable wireless ? repeaters and e911 systems ? digital predistortion ? point to point infrastructure ? public safety infrastructure ? satellite receivers and modems ? wimax receivers and transmitters ? military radios covering hf, vhf, uhf ? rfid handheld and portable readers ? cable infrastructure ? wireless lan ? test / ate equipment f eatures ? low insertion loss: 1.1db @ 500mhz ? typical / min iip3: 60dbm / 46dbm ? typical / min iip2: 98dbm / 74dbm ? 33db attenuation range ? bidirectional rf ports ? +36dbm input p1db compression ? v mode pin allows either positive or negative control response ? linearindb attenuation characteristic ? supply voltage: 3.15v to 5.25v ? v ctrl range: 0v to 3.6v using 5v supply ? +105c max operating temperature ? 3x3, 16pin qfn package d evice b lock d iagram o rdering i nformation p art # m atrix part# rf freq range (mhz) insertion loss (db) iip3 (dbm) pinout compatibility f2250 50 - 6000 1.4 (at 2ghz) +65 rfmd f2255 1 - 3000 1.1 (at 500mhz) +60 F2258 50 - 6000 1.4 (at 2ghz) +65 hittite idt f2255nlgk8 0.9 mm height package green tape & reel omit idt prefix rf product line
voltage variable rf attenuator 1mhz to 3000mhz voltage variable rf attenuator 2 rev o, july 2015 idtf2255nlgk datasheet a bsolute m aximum r atings parameter / condition symbol min max units v dd to gnd v dd 0.3 5.5 v v mode to gnd v mode 0.3 minimum ( v dd , 3.9 ) v v ctrl to gnd v dd = 0v to 5.25v v ctrl 0.3 minimum ( v dd , 4.0 ) v rf1, rf2 to gnd v rf 0.3 0.3 v rf1 or rf2 input power applied for 24 hours maximum ( v dd applied @ 2ghz and tc=+85 c) p max24 30 dbm rf1 or rf2 continuous operating power p max_op see figure 1 dbm maximum junction temperature t jmax +150 c storage temperature range t st 65 +150 c lead temperature (soldering, 10s) t lead +260 c esd voltageC hbm (per esd stm5.12007) v esdhbm class 2 esd voltage C cdm (per esd stm5.3.12009) v esdcdm class c3 f igure 1: m aximum o perating rf i nput p owers vs . rf f requency stresses above those listed above may cause permane nt damage to the device. functional operation of th e device at these or any other conditions above those indicated in the operational section of this specification i s not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability. p ackage t hermal and m oisture c haracteristics ja (junction C ambient) 80.6c/w jc (junction C case) the case is defined as the expose d paddle 5.1c/w moisture sensitivity rating (per jstd020) ms l 1
voltage variable rf attenuator 1mhz to 3000mhz voltage variable rf attenuator 3 rev o, july 2015 idtf2255nlgk datasheet idtf2255 o perating c onditions parameter symbol condition min typ max units operating freq range f rf 1 3000 mhz supply voltage v dd 3.15 5.25 v v mode logic v ih v dd > 3.9v 1.17 3.6 2 v v dd = 3.15 to 3.9v 1.17 v dd 0.3v v il 0 0.63 v ctrl range v ctrl v dd = 3.9v to 5.25v 0 3.6 v v dd = 3.15v to 3.9v 0 v dd 0.3 supply current i dd 0.80 1 1.15 1.50 ma logic current i mode -1.0 24 a i ctrl current i ctrl -1.0 10 a rf operating power 3 p maxcw see figure 1 dbm rf1 port impedance z rf1 50 rf2 port impedance z rf2 50 operating temperature range t case exposed paddle temperature 40 +105 c operating conditions notes: 1 C items in min/max columns in bold italics are guaranteed by test. 2 C items in min/max columns that are not bold/ital ics are guaranteed by design characterization. 3 C refer to the maximum operating rf input power vs. rf frequency curves in figure 1 .
voltage variable rf attenuator 1mhz to 3000mhz voltage variable rf attenuator 4 rev o, july 2015 idtf2255nlgk datasheet idtf2255 s pecifications refer to evkit / applications circuit, v dd = +3.3v, t c = +25c, signals applied to rf1 input, f rf = 500mhz, minimum attenuation, p in = 0dbm for small signal parameters, +20dbm for sin gle tone linearity tests, +20dbm per tone for two tone tests, two tone delta frequency = 80mhz, p cb board traces and connector losses are deembedde d unless otherwise noted. refer to typical operating curves for performance over entire frequency band. parameter symbol condition min typ max units insertion loss, il a min minimum attenuation 1.1 1.7 1 db maximum attenuation a max 33 34.6 db insertion phase ? ?max at 36db attenuation relative to insertion loss 27 deg ?mid at 18db attenuation relative to insertion loss 8 input 1db compression 3 p1db 36 dbm minimum rf1 return loss over control voltage range s11 20mhz 23 db 500mhz 22 2000mhz 23 3000mhz 30 minimum rf2 return loss over control voltage range s22 20mhz 23 db 500mhz 22 2000mhz 23 3000mhz 24 input ip3 iip3 60 dbm input ip3 over attenuation iip3 atten all attenuation settings 44 2 46 minimum output ip3 oip3 min maximum attenuation 35 input ip2 iip2 pin + im2 dbc , im2 term is f1+f2 98 dbm minimum input ip2 iip2 min all attenuation settings 74 dbm input ih2 hd2 pin + h2 dbc 82 dbm input ih3 hd3 pin + (h3 dbc /2) 49 dbm settling time t settl0.1db any 1db step in the 0db to 33db control range 50% v ctrl to rf settled to within 0.1db 15 sec specification notes: 1 C items in min/max columns in bold italics are guaranteed by test 2 C items in min/max columns that are not bold/ital ics are guaranteed by design characterization. 3 C the input 1db compression point is a linearity figure of merit. refer to absolute maximum ratings section along with figure 1 for the maximum rf input power vs. rf frequency.
voltage variable rf attenuator 1mhz to 3000mhz voltage variable rf attenuator 5 rev o, july 2015 idtf2255nlgk datasheet t ypical o perating c urves unless otherwise noted, the following conditions ap ply: ? v dd = +3.3v or +5.0v ? t c = +25oc ? v mode = 0v ? rf trace and connector losses are deembedded for s parameters ? pin = 0dbm for all small signal tests ? pin = +20dbm for single tone linearity tests (rf1 p ort driven) ? pin = +20dbm/tone for two tone linearity tests (rf1 port driven) ? two tone frequency spacing = 80mhz
voltage variable rf attenuator 1mhz to 3000mhz voltage variable rf attenuator 6 rev o, july 2015 idtf2255nlgk datasheet t ypical o perating c onditions [ s2p b roadband p erformance ] (-1-) attenuation vs. v ctrl min. & max. attenuation vs. frequency attenuation vs. frequency attenuation delta to 25c vs. v ctrl -40 -35 -30 -25 -20 -15 -10 -5 0 0.0 0.4 0.8 1.2 1.6 2.0 2.4 2.8 attenuation (db) v ctrl (volts) 25c / 10mhz 25c / 50mhz 25c / 100mhz 25c / 250mhz 25c / 500mhz 25c / 900mhz 25c / 1200mhz 25c / 1900mhz 25c / 2700mhz -40 -32 -24 -16 -8 -8 -6 -4 -2 0 0 500 1000 1500 2000 2500 3000 attenuation (db) frequency (mhz) -40c / 0.0v 25c / 0.0v 105c / 0.0v -40c / 2.8v 25c / 2.8v 105c / 2.8v -45 -40 -35 -30 -25 -20 -15 -10 -5 0 0 500 1000 1500 2000 2500 3000 attenuation (db) frequency (mhz) 25c / 0.0v 25c / 0.8v 25c / 1.0v 25c / 1.2v 25c / 1.4v 25c / 1.6v 25c / 1.8v 25c / 2.2v 25c / 2.8v -3 -2 -1 0 1 2 3 4 0.0 0.4 0.8 1.2 1.6 2.0 2.4 2.8 attenuation error (db) v ctrl (v) -40c / 11mhz -40c / 251mhz -40c / 900mhz 105c / 11mhz 105c / 251mhz 105c / 900mhz
voltage variable rf attenuator 1mhz to 3000mhz voltage variable rf attenuator 7 rev o, july 2015 idtf2255nlgk datasheet t ypical o perating c urves [s2p vs. v ctrl ] (-2-) attenuation vs. v ctrl rf1 return loss vs. v ctrl insertion phase vs. v ctrl attenuation slope vs. v ctrl rf2 return loss vs. v ctrl insertion phase slope vs. v ctrl -40 -35 -30 -25 -20 -15 -10 -5 0 0.0 0.4 0.8 1.2 1.6 2.0 2.4 2.8 attenuation (db) 4mhz 15mhz 60mhz 200mhz 600mhz 1200mhz 2100mhz v ctrl (v) 25c -40 -35 -30 -25 -20 -15 -10 -5 0 0.0 0.4 0.8 1.2 1.6 2.0 2.4 2.8 rf1 return loss (db) 4mhz 15mhz 60mhz 200mhz 600mhz 1200mhz 2100mhz v ctrl (v) 25c 0 10 20 30 40 50 60 70 80 0.0 0.4 0.8 1.2 1.6 2.0 2.4 2.8 insertion phase (deg) 4mhz 15mhz 60mhz 200mhz 600mhz 1200mhz 2100mhz v ctrl (v) 25c 0 5 10 15 20 25 30 35 40 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 attenuation slope (db/v) 4mhz 15mhz 60mhz 200mhz 600mhz 1200mhz 2100mhz v ctrl (v) 25c -40 -35 -30 -25 -20 -15 -10 -5 0 0.0 0.4 0.8 1.2 1.6 2.0 2.4 2.8 rf2 return loss (db) 4mhz 15mhz 60mhz 200mhz 600mhz 1200mhz 2100mhz v ctrl (v) 25c -10 10 30 50 70 90 110 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 insertion phase slope (deg/v) 4mhz 15mhz 60mhz 200mhz 600mhz 1200mhz 2100mhz v ctrl (v) 25c (positive phase = electrically shorter)
voltage variable rf attenuator 1mhz to 3000mhz voltage variable rf attenuator 8 rev o, july 2015 idtf2255nlgk datasheet t ypical o perating c onditions [s2p vs . v ctrl & t emperature ] (-3-) attenuation response vs. v ctrl rf1 return loss vs. v ctrl insertion phase vs. v ctrl attenuation slope vs. v ctrl rf2 return loss vs. v ctrl insertion phase slope vs. v ctrl -40 -35 -30 -25 -20 -15 -10 -5 0 0.0 0.4 0.8 1.2 1.6 2.0 2.4 2.8 attenuation (db) v ctrl (v) -40c / 15mhz -40c / 500mhz -40c / 1200mhz 25c / 15mhz 25c / 500mhz 25c / 1200mhz 105c / 15mhz 105c / 500mhz 105c / 1200mhz -40 -35 -30 -25 -20 -15 -10 -5 0 0.0 0.4 0.8 1.2 1.6 2.0 2.4 2.8 rf1 return loss (db) v ctrl (v) -40c / 15mhz -40c / 500mhz -40c / 1200mhz 25c / 15mhz 25c / 500mhz 25c / 1200mhz 105c / 15mhz 105c / 500mhz 105c / 1200mhz 0 10 20 30 40 50 60 0.0 0.4 0.8 1.2 1.6 2.0 2.4 2.8 insertion phase (deg) v ctrl (v) -40c / 15mhz -40c / 500mhz -40c / 1200mhz 25c / 15mhz 25c / 500mhz 25c / 1200mhz 105c / 15mhz 105c / 500mhz 105c / 1200mhz 0 5 10 15 20 25 30 35 40 45 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6 2.8 attenuation slope (db/v) v ctrl (v) - 40c / 15mhz - 40c / 500mhz - 40c / 1200mhz 25c / 15mhz 25c / 500mhz 25c / 1200mhz 105c / 15mhz 105c / 500mhz 105c / 1200mhz -40 -35 -30 -25 -20 -15 -10 -5 0 0.0 0.4 0.8 1.2 1.6 2.0 2.4 2.8 rf2 return loss (db) v ctrl (v) -40c / 15mhz -40c / 500mhz -40c / 1200mhz 25c / 15mhz 25c / 500mhz 25c / 1200mhz 105c / 15mhz 105c / 500mhz 105c / 1200mhz 0 10 20 30 40 50 60 70 80 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6 2.8 insertion phase slope (deg/v) v ctrl (v) - 40c / 15mhz - 40c / 500mhz - 40c / 1200mhz 25c / 15mhz 25c / 500mhz 25c / 1200mhz 105c / 15mhz 105c / 500mhz 105c / 1200mhz (positive phase = electrically shorter)
voltage variable rf attenuator 1mhz to 3000mhz voltage variable rf attenuator 9 rev o, july 2015 idtf2255nlgk datasheet t ypical o perating c onditions [s2p vs . a ttenuation & t emperature ] (-4-) rf1 return loss vs. attenuation rf2 return loss vs. attenuation insertion phase ? vs. attenuation rf1 return loss vs. attenuation rf2 return loss vs. attenuation insertion phase ? vs. attenuation -40 -35 -30 -25 -20 -15 -10 -5 0 0 4 8 12 16 20 24 28 32 36 rf1 return loss (db) 25c / 4mhz 25c / 15mhz 25c / 60mhz 25c / 200mhz 25c / 600mhz 25c / 1200mhz 25c / 2100mhz attenuation (db) -40 -35 -30 -25 -20 -15 -10 -5 0 0 4 8 12 16 20 24 28 32 36 rf2 return loss (db) 25c / 4mhz 25c / 15mhz 25c / 60mhz 25c / 200mhz 25c / 600mhz 25c / 1200mhz 25c / 2100mhz attenuation (db) 0 10 20 30 40 50 60 70 80 0 4 8 12 16 20 24 28 32 36 insertion phase (deg) 25c / 4mhz 25c / 15mhz 25c / 60mhz 25c / 200mhz 25c / 600mhz 25c / 1200mhz 25c / 2100mhz attenuation (db) -40 -35 -30 -25 -20 -15 -10 -5 0 0 4 8 12 16 20 24 28 32 36 rf1 return loss (db) attenuation (db) -40c / 15mhz -40c / 500mhz -40c / 1200mhz 25c / 15mhz 25c / 500mhz 25c / 1200mhz 105c / 15mhz 105c / 500mhz 105c / 1200mhz -40 -35 -30 -25 -20 -15 -10 -5 0 0 4 8 12 16 20 24 28 32 36 rf2 return loss (db) attenuation (db) -40c / 15mhz -40c / 500mhz - 40c / 1200mhz 25c / 15mhz 25c / 500mhz 25c / 1200mhz 105c / 15mhz 105c / 500mhz 105c / 1200mhz 0 10 20 30 40 50 60 0 4 8 12 16 20 24 28 32 36 insertion phase (deg) attenuation (db) -40c / 15mhz -40c / 500mhz -40c / 1200mhz 25c / 15mhz 25c / 500mhz 25c / 1200mhz 105c / 15mhz 105c / 500mhz 105c / 1200mhz (positive phase = electrically shorter)
voltage variable rf attenuator 1mhz to 3000mhz voltage variable rf attenuator 10 rev o, july 2015 idtf2255nlgk datasheet t ypical o perating c onditions [s2p vs . f requency ] (-5-) min. & max. attenuation vs. frequency worst-case rf1 return loss vs. frequency max. insertion phase vs. frequency min. & max. attenuation slope vs. frequency worst-case rf2 return loss vs. frequency gain compression vs. frequency -40 -32 -24 -16 -8 -8 -6 -4 -2 0 0 500 1000 1500 2000 2500 3000 attenuation (db) frequency (mhz) -40c / 0.0v 25c / 0.0v 105c / 0.0v -40c / 2.8v 25c / 2.8v 105c / 2.8v -40 -35 -30 -25 -20 -15 -10 -5 0 0 500 1000 1500 2000 2500 3000 rf1 worstcase return loss (db) frequency (mhz) -40c 25c 105c 0 10 20 30 40 50 60 70 0 500 1000 1500 2000 2500 3000 max insertion phase (deg) frequency (mhz) -40c 25c 105c 0 5 10 15 20 25 30 35 40 0 500 1000 1500 2000 2500 3000 min/max attn slope (db/v) frequency (mhz) max slope min slope -40 -35 -30 -25 -20 -15 -10 -5 0 0 500 1000 1500 2000 2500 3000 rf2 worstcase return loss (db) frequency (mhz) -40c 25c 105c -2 -1.5 -1 -0.5 0 0.5 1 10 14 18 22 26 30 34 38 gain compression (db) rf input power (dbm) 1mhz 125mhz 250mhz 500mhz 1000mhz 2700mhz (positive phase = electrically shorter) v ctrl varied from 0.8v to 1.7v
voltage variable rf attenuator 1mhz to 3000mhz voltage variable rf attenuator 11 rev o, july 2015 idtf2255nlgk datasheet t ypical o perating c onditions [s2p @ l ow f requency , g roup d elay ] (-6-) min. & max. attenuation vs. low frequency low-frequency rf1 return loss vs. v ctrl group delay vs. frequency low-frequency attenuation vs. v ctrl low-frequency rf2 return loss vs. v ctrl -45 -40 -35 -30 -25 -20 -15 -10 -5 0 0 10 20 30 40 50 60 70 80 90 100 attenuation (db) frequency (mhz) 0.0v 2.8v -40 -35 -30 -25 -20 -15 -10 -5 0 0.0 0.4 0.8 1.2 1.6 2.0 2.4 2.8 rf1 return loss (db) 0.5mhz 1.0mhz 3.0mhz 7.0mhz 10.0mhz 50.0mhz 100.0mhz v ctrl (v) -100 -50 0 50 100 150 200 0 500 1000 1500 2000 2500 3000 group delay (picosec) frequency (mhz) -40c / 0.8v -40c / 1.8v 25c / 0.8v 25c / 1.8v 105c / 0.8v 105c / 1.8v -45 -40 -35 -30 -25 -20 -15 -10 -5 0 0.0 0.4 0.8 1.2 1.6 2.0 2.4 2.8 attenuation (db) 0.5mhz 1.0mhz 3.0mhz 7.0mhz 10.0mhz 50.0mhz 100.0mhz v ctrl (v) 25c -40 -35 -30 -25 -20 -15 -10 -5 0 0.0 0.4 0.8 1.2 1.6 2.0 2.4 2.8 rf2 return loss (db) 0.5mhz 1.0mhz 3.0mhz 7.0mhz 10.0mhz 50.0mhz 100.0mhz v ctrl (v)
voltage variable rf attenuator 1mhz to 3000mhz voltage variable rf attenuator 12 rev o, july 2015 idtf2255nlgk datasheet t ypical o perating c onditions 500mh z , v dd =3.3v [ip3, ip2, ih2, ih3 vs . v ctrl, v mode ] (-7-) input ip3 vs. v ctrl input ip2 vs. v ctrl 2 nd harm input intercept point vs. v ctrl output ip3 vs. v ctrl output ip2 vs. v ctrl 3 rd harm input intercept point vs. v ctrl 20 30 40 50 60 70 80 0 0.4 0.8 1.2 1.6 2 2.4 2.8 input ip3 (dbm) v ctrl (v) -40c / vmode = 0v 25c / vmode = 0v 105c / vmode = 0v -40c / vmode = 3v 25c / vmode = 3v 105c / vmode = 3v 40 50 60 70 80 90 100 110 120 0 0.4 0.8 1.2 1.6 2 2.4 2.8 input ip2 (dbm) v ctrl (v) -40c / vmode = 3v 25c / vmode = 3v 105c / vmode = 3v -40c / vmode = 0v 25c / vmode = 0v 105c / vmode = 0v 50 60 70 80 90 100 110 120 130 140 0 0.4 0.8 1.2 1.6 2 2.4 2.8 ih2 (dbm) v ctrl (v) -40c / vmode = 0v 25c / vmode = 0v 105c / vmode = 0v -40c / vmode = 3v 25c / vmode = 3v 105c / vmode = 3v 0 10 20 30 40 50 60 70 80 0 0.4 0.8 1.2 1.6 2 2.4 2.8 output ip3 (dbm) v ctrl (v) -40c / vmode = 0v 25c / vmode = 0v 105c / vmode = 0v -40c / vmode = 3v 25c / vmode = 3v 105c / vmode = 3v 30 40 50 60 70 80 90 100 110 120 0 0.4 0.8 1.2 1.6 2 2.4 2.8 output ip2 (dbm) v ctrl (v) -40c / vmode = 0v 25c / vmode = 0v 105c / vmode = 0v -40c / vmode = 3v 25c / vmode = 3v 105c / vmode = 3v 10 20 30 40 50 60 70 80 90 0 0.4 0.8 1.2 1.6 2 2.4 2.8 ih3 (dbm) v ctrl (v) -40c / vmode = 0v 25c / vmode = 0v 105c / vmode = 0v -40c / vmode = 3v 25c / vmode = 3v 105c / vmode = 3v
voltage variable rf attenuator 1mhz to 3000mhz voltage variable rf attenuator 13 rev o, july 2015 idtf2255nlgk datasheet t ypical o perating c onditions 500mh z , v dd =3.3v [ip3, ip2, ih2, ih3 vs . v ctrl, rf1/rf2 d riven ] (-8-) input ip3 vs. v ctrl input ip2 vs. v ctrl 2 nd harm input intercept point vs. v ctrl output ip3 vs. v ctrl output ip2 vs. v ctrl 3 rd harm input intercept point vs. v ctrl 20 30 40 50 60 70 80 0 0.4 0.8 1.2 1.6 2 2.4 2.8 input ip3 (dbm) v ctrl (v) -40c / rf1 driven 25c / rf1 driven 105c / rf1 driven -40c / rf2 driven 25c / rf2 driven 105c / rf2 driven 40 50 60 70 80 90 100 110 120 0 0.4 0.8 1.2 1.6 2 2.4 2.8 input ip2 (dbm) v ctrl (v) -40c / rf1 driven 25c / rf1 driven 105c / rf1 driven -40c / rf2 driven 25c / rf2 driven 105c / rf2 driven 50 60 70 80 90 100 110 120 130 0 0.4 0.8 1.2 1.6 2 2.4 2.8 ih2 (dbm) v ctrl (v) -40c / rf1 driven 25c / rf1 driven 105c / rf1 driven -40c / rf2 driven 25c / rf2 driven 105c / rf2 driven 10 20 30 40 50 60 70 0 0.4 0.8 1.2 1.6 2 2.4 2.8 output ip3 (dbm) v ctrl (v) -40c / rf1 driven 25c / rf1 driven 105c / rf1 driven -40c / rf2 driven 25c / rf2 driven 105c / rf2 driven 30 40 50 60 70 80 90 100 110 120 0 0.4 0.8 1.2 1.6 2 2.4 2.8 output ip2 (dbm) v ctrl (v) -40c / rf1 driven 25c / rf1 driven 105c / rf1 driven -40c / rf2 driven 25c / rf2 driven 105c / rf2 driven 10 20 30 40 50 60 70 80 90 0 0.4 0.8 1.2 1.6 2 2.4 2.8 ih3 (dbm) v ctrl (v) -40c / rf1 driven 25c / rf1 driven 105c / rf1 driven -40c / rf2 driven 25c / rf2 driven 105c / rf2 driven
voltage variable rf attenuator 1mhz to 3000mhz voltage variable rf attenuator 14 rev o, july 2015 idtf2255nlgk datasheet t ypical o perating c onditions 500mh z , v dd =3.3v [ip3, ip2, ih2, ih3 vs . a ttenuation ] (-9-) input ip3 vs. attenuation input ip2 vs. attenuation 2 nd harm input intercept point vs. attenuation output ip3 vs. attenuation output ip2 vs. attenuation 3 rd harm input intercept point vs. attenuation 20 30 40 50 60 70 80 0 4 8 12 16 20 24 28 32 36 input ip3 (dbm) attenuation (db) -40c 25c 105c 40 50 60 70 80 90 100 110 120 0 4 8 12 16 20 24 28 32 36 input ip2 (dbm) attenuation (db) -40c 25c 105c 60 70 80 90 100 110 120 130 140 0 4 8 12 16 20 24 28 32 36 ih2 (dbm) attenuation (db) -40c 25c 105c 10 20 30 40 50 60 70 80 0 4 8 12 16 20 24 28 32 36 output ip3 (dbm) attenuation (db) -40c 25c 105c 30 40 50 60 70 80 90 100 110 120 0 4 8 12 16 20 24 28 32 36 output ip2 (dbm) attenuation (db) -40c 25c 105c 10 20 30 40 50 60 70 80 90 0 4 8 12 16 20 24 28 32 36 ih3 (dbm) attenuation (db) -40c 25c 105c
voltage variable rf attenuator 1mhz to 3000mhz voltage variable rf attenuator 15 rev o, july 2015 idtf2255nlgk datasheet t ypical o perating c onditions 500mh z , v dd =3.3v [ip3, ip2, ih2, ih3 vs . v ctrl, rf1/rf2 d riven ] (-10-) input ip3 vs. attenuation input ip2 vs. attenuation 2 nd harm input intercept point vs. attenuation output ip3 vs. attenuation output ip2 vs. attenuation 3 rd harm input intercept point vs. attenuation 20 30 40 50 60 70 80 0 4 8 12 16 20 24 28 32 36 input ip3 (dbm) attenuation (db) -40c / rf1 driven 25c / rf1 driven 105c / rf1 driven -40c / rf2 driven 25c / rf2 driven 105c / rf2 driven 40 50 60 70 80 90 100 110 120 0 4 8 12 16 20 24 28 32 36 input ip2 (dbm) attenuation (db) -40c / rf1 driven 25c / rf1 driven 105c / rf1 driven -40c / rf2 driven 25c / rf2 driven 105c / rf2 driven 50 60 70 80 90 100 110 120 130 0 4 8 12 16 20 24 28 32 36 ih2 (dbm) attenuation(db) -40c / rf1 driven 25c / rf1 driven 105c / rf1 driven -40c / rf2 driven 25c / rf2 driven 105c / rf2 driven 10 20 30 40 50 60 70 0 4 8 12 16 20 24 28 32 36 output ip3 (dbm) attenuation (db) -40c / rf1 driven 25c / rf1 driven 105c / rf1 driven -40c / rf2 driven 25c / rf2 driven 105c / rf2 driven 30 40 50 60 70 80 90 100 110 120 0 4 8 12 16 20 24 28 32 36 output ip2 (dbm) attenuation (db) -40c / rf1 driven 25c / rf1 driven 105c / rf1 driven -40c / rf2 driven 25c / rf2 driven 105c / rf2 driven 10 20 30 40 50 60 70 80 90 0 4 8 12 16 20 24 28 32 36 ih3 (dbm) attenuation (db) -40c / rf1 driven 25c / rf1 driven 105c / rf1 driven -40c / rf2 driven 25c / rf2 driven 105c / rf2 driven
voltage variable rf attenuator 1mhz to 3000mhz voltage variable rf attenuator 16 rev o, july 2015 idtf2255nlgk datasheet p ackage d rawing (3 x 3 16 pin )
voltage variable rf attenuator 1mhz to 3000mhz voltage variable rf attenuator 17 rev o, july 2015 idtf2255nlgk datasheet p inout & b lock d iagram gnd 1 4 3 2 nc nc rf1 rf2 12 9 10 nc 11 nc gnd control rtn gnd rtn 5 6 7 8 rtn 13 nc 14 15 16 v dd v mode v ctrl e.p.
voltage variable rf attenuator 1mhz to 3000mhz voltage variable rf attenuator 18 rev o, july 2015 idtf2255nlgk datasheet p in d escription pin name function 1, 7, 12 gnd ground these pins as close to the devi ce as possible. 2, 4, 9, 11, 13 nc no internal connection. idt recommends connecting these pins to gnd. 3 rf1 rf port 1. matched to 50 ohms. must use an extern al ac coupling capacitor as close to the device as possib le. for low frequency operation increase the capacitor value to result in a low reactance at the frequency of interest. 5, 6, 8 rtn attenuator ground return. each of these pins requir e a capacitor to gnd to provide an rf return path. placed as clo se to the device as possible. 10 rf2 rf port 2. matched to 50 ohms. must use an extern al ac coupling capacitor as close to the device as possib le. for low frequency operation increase the capacitor value to result in a low reactance at the frequency of interest. 14 v ctrl attenuator control voltage. apply a voltage in the range as specified in the operating conditions table. see ap plication section for details about v ctrl . 15 v dd power supply input. bypass to gnd with capacitors c lose as possible to pin. 16 v mode attenuator slope control. set to logic low to enab le negative attenuation slope. set to logic high to enable pos itive attenuation slope. ep exposed pad. internally connected to gnd. solder th is exposed pad to a pcb pad that uses multiple ground vias to achieve the specified rf performance.
voltage variable rf attenuator 1mhz to 3000mhz voltage variable rf attenuator 19 rev o, july 2015 idtf2255nlgk datasheet a pplications i nformation default start-up v mode must be tied to either gnd or logic high. if the v ctrl pin is left floating, the part will power up in th e minimum attenuation state when v mode = gnd, or the maximum attenuation state when v mode = high. v ctrl the v ctrl pin is used to control the attenuation of the f2255 . with v mode set to a logic low (high), this places the device in a negative (positive) slope mode wher e increasing (decreasing) the v ctrl voltage produces an increasing (a decreasing) attenuation from min atte nuation (max attenuation) to max attenuation (min attenuation) respectively. see the operating condi tions table for the allowed control voltage range a nd its dependence on v dd . the v ctrl pin has an onchip pullup esd diode so v dd should be applied before v ctrl is applied. if this sequencing is not possible, then resistor r2 should be set for 1k? to limit the curr ent into the v ctrl pin. v mode the v mode pin is used to set the attenuation vs. v ctrl slope. with v mode set to logic low (high) this will set the attenuation slope to be negative (positive). a neg ative (positive) slope is defined as increasing (de creasing) attenuation with increasing (decreasing) v ctrl voltage. the evkit provides an onboard jumper to m anually set the v mode. install a jumper on header j2 from v mode (pin2) to gnd (pin3) to set the device for a negat ive slope. for a positive slope install the j2 jumper f rom v mode (pin2) to vhi (pin1). for proper operation one of the above noted jumper positions must be selected. rf1 and rf2 ports the f2255 is a bidirectional device thus allowing rf1 or rf2 to be used as the rf input. as displayed in the typical operating conditions curves, rf1 shows enha nced linearity when used as the rf input. v dd must be applied prior to the application of rf power to ens ure reliability. dc blocking capacitors are require d on the rf pins and should be set to a value that results i n a low reactance over the frequency range of inter est. power supplies the supply pin should be bypassed with external cap acitors to minimize noise and fast transients. supp ly noise can degrade noise figure and fast transients can tr igger esd clamps and cause them to fail. supply vol tage change or transients should have a slew rate smalle r than 1v/20us. in addition, all control pins shou ld remain at 0v (+/0.3v) while the supply voltage ramps or w hile it returns to zero.
voltage variable rf attenuator 1mhz to 3000mhz voltage variable rf attenuator 20 rev o, july 2015 idtf2255nlgk datasheet control pin interface if control signal integrity is a concern and clean signals cannot be guaranteed due to overshoot, unde rshoot, ringing, etc., the following circuit at the input o f control pins 14 and 16 is recommended as shown be low.
voltage variable rf attenuator 1mhz to 3000mhz voltage variable rf attenuator 21 rev o, july 2015 idtf2255nlgk datasheet ev kit / a pplications c ircuit
voltage variable rf attenuator 1mhz to 3000mhz voltage variable rf attenuator 22 rev o, july 2015 idtf2255nlgk datasheet ev kit p icture / l ayout (t op v iew )
voltage variable rf attenuator 1mhz to 3000mhz voltage variable rf attenuator 23 rev o, july 2015 idtf2255nlgk datasheet ev kit p icture / l ayout (b ottom v iew )
voltage variable rf attenuator 1mhz to 3000mhz voltage variable rf attenuator 24 rev o, july 2015 idtf2255nlgk datasheet ev kit bom t op m arkings

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