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voltage variable rf attenuator 50mhz to 60 00mhz voltage variable rf attenuator 1 rev 4 , january 2017 f 2250nlgk datasheet g eneral d escription the f 2250 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 covers a broad frequency range from 50mhz to 6000 mhz. in addition to provi ding low insertion loss, the f2250 provides excellent linearity performance over its entire voltage control and attenuation range. the f2250 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 control slope vs attenuation and multi - directional operation meaning the rf input can be applied to either rf1 or rf2 pins. control voltage ranges from 0v to 3.6 v using either positive or negative control voltage slope. c ompetitive a dvantage f2250 provides extremely low insertion loss and superb ip3, ip2, return loss and slope linearity across the control range. comparing to the previous state - of - the - art for silicon vvas this device is better as follows: ? insertion loss @ 2 000m hz: 1.4 db vs. 2.8db ? insertion loss @ 6000m hz: 2.7db vs. 7db ? maximum attenuation slope: 33db/volt vs. 53db/volt ? minimum return loss up to 6 000m hz : 12.5 db vs. 7db ? minimum output ip3 : 31 dbm vs. 15 dbm ? minimum input ip2 : 87 dbm vs. 80 dbm ? maximum operating temperature: +1 05 c vs. +85c a pplications ? base station 2g, 3g, 4g ? portable wireless ? repeaters and e911 systems ? digital pre - distortion ? point to point infrastructure ? public safety infrastructure ? wimax receivers and transmitters ? military systems, jtrs radios ? rfid hand held and portable readers ? cable infrastructure ? wireless lan ? test / ate equipment ? f eatures ? low i nsertion l oss : 1 .4 db @ 2000mhz ? typical / min i ip3 : 65dbm / 47dbm ? typical / min iip2: 95dbm / 87dbm ? 3 3.6 db attenuation range ? bi - directional rf ports ? +34 .4 dbm input p1db compression ? v mode pin allows either positive or negative attenuation control response ? linear - in - db attenuation characteristic ? supply voltage: 3.15v to 5.25v ? v ctrl range: 0v to 3.6 v using 5v supply ? +1 05 c max o perating temperature ? 3 mm x 3 mm , 16 - pin qfn package d evice b lock d iagram o rdering i nformation p art # m atrix part# rf freq r ange (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 f2250 nlgk 8 0.9 mm height package green temp r ange tape & reel rf p roduct line r f 1 r f 2 c o n t r o l v d d v m o d e v c t r l
voltage variable rf attenuator 50mhz to 60 00mhz voltage variable rf attenuator 2 rev 4 , january 2017 f 2250nlgk 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 +85 c ) p max 24 30 dbm rf1 or rf2 continuous operating power p max_op see figure 1 dbm maximum junction temperature t jmax +15 0 c storage temperature range t st - 65 +150 c lead temperature (soldering, 10s) t lead +260 c esd voltage C hbm (per esd stm5.1 - 2007 ) v esdhbm class 1c esd voltage C cdm (per esd stm5.3.1 - 2009) v esdcdm class c 3 f igure 1: m aximum rf i nput p ower vs . rf f requency stresses above those listed above may cause permanent damage to the device. functional operation of the device at these or any other conditions above those indicated in the operational section of this specification is 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 exposed paddle 5.1c/w moisture sensitivity rating (per j - std - 020) msl 1
voltage variable rf attenuator 50mhz to 60 00mhz voltage variable rf attenuator 3 rev 4 , january 2017 f 2250nlgk datasheet f 2250 o perating c onditions parameter symbol condition min typ max units operating freq range f rf 50 6000 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 v to 3.9v 1.17 v dd - 0.3 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. 5 1 1. 1 7 2 ma logic current i mode - 1 3 8 a i ctrl current i ctrl - 1 1 4 a rf operating power 3 p max , cw see figure 1 dbm rf1 port i mpedance z rf1 50 rf2 port i mpedance z rf2 50 operating temperature range t case exposed paddle temperature - 40 +1 05 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/italics are guaranteed by design characterization. 3 C refer to the maximum operating rf input power vs. rf frequency curve s in figure 1 .
voltage variable rf attenuator 50mhz to 60 00mhz voltage variable rf attenuator 4 rev 4 , january 2017 f 2250nlgk datasheet f 2250 s pecification refer to evkit / applications circuit , v dd = +3.3v, t c = +25c, s ignal s applied to rf1 input, f rf = 2000mhz, minimum attenuation, p in = 0 dbm for small signal parameters, +20dbm for single tone linearity tests, +20dbm per tone for two tone tests , two tone delta frequency = 50mhz, pcb board trace s and connector losses are de - embedded unless otherwise noted. refer to typical operating curves for performance over entire frequency band. parameter symbol comment min typ max units insertion loss, il (minimum attenuation) a min 2ghz 1.4 1.9 1 db 3ghz 1.6 6ghz 2.6 3.1 maximum a ttenuation a max 34 2 35 db insertion phase max at 36db attenuation relative to insertion loss 27 deg mid at 18db attenuation relative to insertion loss 10 input 1db compression 3 p1db 34.4 dbm minimum rf1 return loss over control voltage range s11 50mhz 4 16 db 700mhz 17 2000mhz 17 6000mhz 15 minimum rf2 return loss over control voltage range s22 50mhz 4 16 db 700mhz 1 5 2000mhz 1 6 6000mhz 1 3 input ip3 iip3 65 dbm input ip3 over attenuation iip3 atten all attenuation settings 44 47 minimum output ip3 oip3 min maximum attenuation 3 5 input ip2 iip2 p in + im2 dbc , im2 term is f1+f2 95 dbm minimum input ip2 iip2 min all attenuation settings 87 dbm input ih2 hd2 p in + h2 dbc 90 dbm input ih3 hd3 p in + (h3 dbc /2) 54 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 s ec 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/italics 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 . 4 C set blocking capacitors c7 & c8 to 0.01uf to achieve best return loss performance at 50mhz.
voltage variable rf attenuator 50mhz to 60 00mhz voltage variable rf attenuator 5 rev 4 , january 2017 f 2250nlgk datasheet t ypical o perating c onditions unless otherwise noted, the following conditions apply: ? v dd = + 3.3v or + 5.0v ? t c = + 25 o c ? v mode = 0v ? rf trace and connector losses are de - embedded for s - parameters ? pin = 0dbm for all small signal tests ? pin = + 20dbm for single tone linearity tests (rf1 port driven) ? pin = + 20dbm/tone for two tone linearity tests (rf1 port driven) ? two tone frequency spacing = 50mhz
voltage variable rf attenuator 50mhz to 60 00mhz voltage variable rf attenuator 6 rev 4 , january 2017 f 2250nlgk 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. frequency - 40 - 35 - 30 - 25 - 20 - 15 - 10 - 5 0 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 2.2 2.4 2.6 attenuation (db) v ctrl (v) 0.9ghz / vmode = 0v 0.9ghz / vmode = 3v 2.0ghz / vmode = 0v 2.0ghz / vmode = 3v 3.0ghz / vmode = 0v 3.0ghz / vmode = 3v - 50 - 45 - 40 - 35 - 30 - 25 - 20 - 6 - 5 - 4 - 3 - 2 - 1 0 0 1 2 3 4 5 6 7 8 9 min. attenuation (db) frequency (ghz) - 40c / vctrl = 0.0v 25c / vctrl = 0.0v 105c / vctrl = 0.0v - 40c / vctrl = 3.0v 25c / vctrl = 3.0v 105c / vctrl = 3.0v max. attenuation (db) - 50 - 40 - 30 - 20 - 10 0 0 1 2 3 4 5 6 7 8 9 attenuation (db) frequency (ghz) vctrl = 0.0v vctrl = 0.8v vctrl = 1.0v vctrl = 1.2v vctrl = 1.4v vctrl = 1.6v vctrl = 1.8v vctrl = 2.4v - 3.00 - 2.50 - 2.00 - 1.50 - 1.00 - 0.50 0.00 0.50 1.00 1.50 2.00 2.50 3.00 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6 attenuation delta to 25c (db) v ctrl (v) - 40c / 0.9ghz - 40c / 2.0ghz - 40c / 3.0ghz 105c / 0.9ghz 105c / 2.0ghz 105c / 3.0ghz
voltage variable rf attenuator 50mhz to 60 00mhz voltage variable rf attenuator 7 rev 4 , january 2017 f 2250nlgk 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 rf 2 return loss vs. v ctrl insertion phase slope vs. v ctrl ( positive phase = electrically shorter) - 40 - 35 - 30 - 25 - 20 - 15 - 10 - 5 0 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6 attenuation (db) v ctrl (v) 0.4ghz 0.7ghz 1.5ghz 2.7ghz 4.0ghz 5.0ghz 6.0ghz - 40 - 35 - 30 - 25 - 20 - 15 - 10 - 5 0 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6 rf1 return loss (db) v ctrl (v) 0.4ghz 0.7ghz 1.5ghz 2.7ghz 4.0ghz 5.0ghz 6.0ghz - 10 0 10 20 30 40 50 60 70 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6 insertion phase ? (deg) v ctrl (v) 0.4ghz 0.7ghz 1.5ghz 2.7ghz 4.0ghz 5.0ghz 6.0ghz 0 5 10 15 20 25 30 35 40 45 50 0.5 0.7 0.9 1.1 1.3 1.5 1.7 1.9 2.1 attenuation slope (db/v) v ctrl (v) 0.4ghz 0.7ghz 1.5ghz 2.7ghz 4.0ghz 5.0ghz 6.0ghz - 40 - 35 - 30 - 25 - 20 - 15 - 10 - 5 0 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6 rf2 return loss (db) v ctrl (v) 0.4ghz 0.7ghz 1.5ghz 2.7ghz 4.0ghz 5.0ghz 6.0ghz - 20 0 20 40 60 80 100 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 insertion phase slope (deg/v) v ctrl (v) 0.4ghz 0.7ghz 1.5ghz 2.7ghz 4.0ghz 5.0ghz 6.0ghz
voltage variable rf attenuator 50mhz to 60 00mhz voltage variable rf attenuator 8 rev 4 , january 2017 f 2250nlgk 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 ( positive phase = electrically shorter) - 40 - 35 - 30 - 25 - 20 - 15 - 10 - 5 0 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6 attenuation (db) v ctrl (v) - 40c / 0.9ghz 25c / 0.9ghz 105c / 0.9ghz - 40c / 2.0ghz 25c / 2.0ghz 105c / 2.0ghz - 40c / 3.0ghz 25c / 3.0ghz 105c / 3.0ghz - 40 - 35 - 30 - 25 - 20 - 15 - 10 - 5 0 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6 rf1 return loss (db) v ctrl (v) - 40c / 0.9ghz - 40c / 2.0ghz - 40c / 3.0ghz 25c / 0.9ghz 25c / 2.0ghz 25c / 3.0ghz 105c / 0.9ghz 105c / 2.0ghz 105c / 3.0ghz 0 5 10 15 20 25 30 35 40 45 50 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6 insertion phase ? (deg) v ctrl (v) -40c / 0.9ghz 25c / 0.9ghz 105c / 0.9ghz -40c / 2.0ghz 25c / 2.0ghz 105c / 2.0ghz -40c / 3.0ghz 25c / 3.0ghz 105c / 3.0ghz 0 5 10 15 20 25 30 35 40 45 50 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 attenuation slope (db/v) v ctrl (v) - 40c / 0.9ghz 25c / 0.9ghz 105c / 0.9ghz - 40c / 2.0ghz 25c / 2.0ghz 105c / 2.0ghz - 40c / 3.0ghz 25c / 3.0ghz 105c / 3.0ghz - 40 - 35 - 30 - 25 - 20 - 15 - 10 - 5 0 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6 rf2 return loss (db) v ctrl (v) - 40c / 0.9ghz - 40c / 2.0ghz - 40c / 3.0ghz 25c / 0.9ghz 25c / 2.0ghz 25c / 3.0ghz 105c / 0.9ghz 105c / 2.0ghz 105c / 3.0ghz 0 10 20 30 40 50 60 70 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 insertion phase slope (deg/v) v ctrl (v) - 40c / 0.9ghz - 40c / 2.0ghz - 40c / 3.0ghz 25c / 0.9ghz 25c / 2.0ghz 25c / 3.0ghz 105c / 0.9ghz 105c / 2.0ghz 105c / 3.0ghz
voltage variable rf attenuator 50mhz to 60 00mhz voltage variable rf attenuator 9 rev 4 , january 2017 f 2250nlgk 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 (positive phase = electrically shorter) - 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) 0.4ghz 0.7ghz 1.5ghz 2.7ghz 4.0ghz 5.0ghz 6.0ghz - 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) 0.4ghz 0.7ghz 1.5ghz 2.7ghz 4.0ghz 5.0ghz 6.0ghz - 10 0 10 20 30 40 50 60 70 0 4 8 12 16 20 24 28 32 36 insertion phase ? (deg) attenuation (db) 0.4ghz 0.7ghz 1.5ghz 2.7ghz 4.0ghz 5.0ghz 6.0ghz - 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 / 0.9ghz - 40c / 2.0ghz - 40c / 3.0ghz 25c / 0.9ghz 25c / 2.0ghz 25c / 3.0ghz 105c / 0.9ghz 105c / 2.0ghz 105c / 3.0ghz - 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 / 0.9ghz - 40c / 2.0ghz - 40c / 3.0ghz 25c / 0.9ghz 25c / 2.0ghz 25c / 3.0ghz 105c / 0.9ghz 105c / 2.0ghz 105c / 3.0ghz
voltage variable rf attenuator 50mhz to 60 00mhz voltage variable rf attenuator 10 rev 4 , january 2017 f 2250nlgk 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 vctrl varied from 0.8v to 1.8v (positive phase = electrically shorter) - 39 - 37 - 35 - 33 - 31 - 29 - 27 - 25 - 23 - 8 - 7 - 6 - 5 - 4 - 3 - 2 - 1 0 0 1 2 3 4 5 6 min. attenuation (db) frequency (ghz) - 40c / vctrl = 0v 25c / vctrl = 0v 105c / vctrl = 0v - 40c / vctrl = 3v 25c / vctrl = 3v 105c / vctrl = 3v max. attenuation (db) - 25 - 20 - 15 - 10 - 5 0 0 1 2 3 4 5 6 worst - case rf1 return loss (db) frequency (ghz) - 40c 25c 105c - 10 0 10 20 30 40 50 60 70 0 1 2 3 4 5 6 max. insertion phase ? (deg) frequency (ghz) - 40c 25c 105c 10 15 20 25 30 35 40 45 50 0 1 2 3 4 5 6 min./max. atenuation slope (db/v) frequency (ghz) max. slope min. slope - 25 - 20 - 15 - 10 - 5 0 0 1 2 3 4 5 6 worst - case rf2 return loss (db) frequency (ghz) - 40c 25c 105c - 2 - 1.5 - 1 - 0.5 0 0.5 1 14 16 18 20 22 24 26 28 30 32 34 36 38 gain compression (db) rf input power (dbm) 50mhz 100mhz 200mhz 400mhz 500mhz 1000mhz 2000mhz 4000mhz 6000mhz
voltage variable rf attenuator 50mhz to 60 00mhz voltage variable rf attenuator 11 rev 4 , january 2017 f 2250nlgk datasheet t ypical o perating c onditions [s2p @ l ow f requency , g r ou p d ela y ] ( - 6 - ) min. & max. attenuation vs. low frequency low - frequency rf1 return loss vs. v ctrl worst - case return loss vs. low frequency low - frequency attenuation vs. v ctrl low - frequency rf2 return loss vs. v ctrl group delay vs. v ctrl ( c7,c8 set to 0.1uf ) ( c7,c8 set to 0.1uf ) ( c7,c8 set to 0.1uf ) ( c7,c8 set to 0.1uf ) ( c7,c8 set to 0.1uf ) - 38 - 34 - 30 - 26 - 22 - 18 - 14 - 10 - 7 - 6 - 5 - 4 - 3 - 2 - 1 0 0 100 200 300 400 500 min. attenuation (db) frequency (mhz) - 40c / vctrl = 0v 25c / vctrl = 0v 105c / vctrl = 0v - 40c / vctrl = 3v 25c / vctrl = 3v 105c / vctrl = 3v max. attenuation (db) - 40 - 35 - 30 - 25 - 20 - 15 - 10 - 5 0 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 2.2 2.4 2.6 rf1 return loss (db) v ctrl (v) - 40c / 43mhz 25c / 43mhz 105c / 43mhz - 40c / 128mhz 25c / 128mhz 105c / 128mhz - 40c / 255mhz 25c / 255mhz 105c / 255mhz - 20 - 15 - 10 - 5 0 0 100 200 300 400 500 worst - case return loss (db) frequency (mhz) - 40c /rf1 25c / rf1 105c / rf1 - 40c / rf2 25c / rf2 105c / rf2 - 40 - 35 - 30 - 25 - 20 - 15 - 10 - 5 0 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 2.2 2.4 2.6 attenuation (db) v ctrl (v) - 40c / 43mhz 25c / 43mhz 105c / 43mhz - 40c / 128mhz 25c / 128mhz 105c / 128mhz - 40c / 255mhz 25c / 255mhz 105c / 255mhz - 40 - 35 - 30 - 25 - 20 - 15 - 10 - 5 0 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 2.2 2.4 2.6 rf2 return loss (db) v ctrl (v) - 40c / 43mhz 25c / 43mhz 105c / 43mhz - 40c / 128mhz 25c / 128mhz 105c / 128mhz - 40c / 255mhz 25c / 255mhz 105c / 255mhz
voltage variable rf attenuator 50mhz to 60 00mhz voltage variable rf attenuator 12 rev 4 , january 2017 f 2250nlgk datasheet t ypical o perating c onditions 2gh 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 out put ip2 vs. v ctrl 3 rd harm input intercept point vs. v ctrl 30 35 40 45 50 55 60 65 70 75 80 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 2.2 2.4 2.6 input ip3 (dbm) v ctrl (v) - 40c / vmode = 0v 25c / vmode = 0v 105c / vmode = 0v - 40c / vmode= 3v 25c / vmode= 3v 105c / vmode= 3v 50 60 70 80 90 100 110 120 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 2.2 2.4 2.6 input ip2 (dbm) v ctrl (v) - 40c / vmode = 0v 25c / vmode = 0v 105c / vmode = 0v - 40c / vmode = 3v 25c / vmode = 3v 105c / vmode = 3v 60 70 80 90 100 110 120 130 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 2.2 2.4 2.6 ih2 (dbm) v ctrl (v) - 40c / vmode = 0v 25c / vmode = 0v 105c / vmode = 0v - 40c / vmode = 3v 25c / vmode = 3v 105c / vmode = 3v 10 15 20 25 30 35 40 45 50 55 60 65 70 75 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 2.2 2.4 2.6 output ip3 (dbm) v ctrl (v) - 40c / vmode = 0v 25c / vmode = 0v 105c / vmode = 0v - 40c / vmode= 3v 25c / vmode= 3v 105c / vmode= 3v 50 60 70 80 90 100 110 120 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 2.2 2.4 2.6 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 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 2.2 2.4 2.6 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 50mhz to 60 00mhz voltage variable rf attenuator 13 rev 4 , january 2017 f 2250nlgk datasheet t ypical o perating c onditions 2gh 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 out put ip2 vs. v ctrl 3 rd harm input intercept point vs. v ctrl 30 35 40 45 50 55 60 65 70 75 80 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 2.2 2.4 2.6 input ip3 (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 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 2.2 2.4 2.6 input ip2 (dbm) v ctrl (v) - 40c / rf1 driven 25c / rf1 driven 105c / rf1 driven - 40c / rf2 driven 25c / rf2 driven 105c / rf2 driven 60 70 80 90 100 110 120 130 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 2.2 2.4 2.6 ih2 (dbm) v ctrl (v) - 40c / rf1 driven 25c / rf1 driven 105c / rf1 driven - 40c / rf2 driven 25c / rf2 driven 105c / rf2 driven 10 15 20 25 30 35 40 45 50 55 60 65 70 75 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 2.2 2.4 2.6 output ip3 (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 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 2.2 2.4 2.6 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 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 2.2 2.4 2.6 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 50mhz to 60 00mhz voltage variable rf attenuator 14 rev 4 , january 2017 f 2250nlgk datasheet t ypical o perating c onditions 2gh 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 ip 2 vs. attenuation 3 rd harm input intercept point vs. attenuation 30 35 40 45 50 55 60 65 70 75 80 0 4 8 12 16 20 24 28 32 36 input ip3 (dbm) attenuation (db) - 40c 25c 125c 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 0 4 8 12 16 20 24 28 32 36 ih2 (dbm) attenuation (db) - 40c 25c 105c 10 15 20 25 30 35 40 45 50 55 60 65 70 75 0 4 8 12 16 20 24 28 32 36 output ip3 (dbm) attenuation (db) - 40c 25c 105c 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 0 4 8 12 16 20 24 28 32 36 ih3 (dbm) attenuation (db) - 40c 25c 105c
voltage variable rf attenuator 50mhz to 60 00mhz voltage variable rf attenuator 15 rev 4 , january 2017 f 2250nlgk datasheet t ypical o perating c onditions 2gh z , v dd =3.3v [ ip3, ip2, ih2, ih3 vs . a tten , 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 ip 2 vs. attenuation 3 rd harm input intercept point vs. attenuation 30 35 40 45 50 55 60 65 70 75 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 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 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 15 20 25 30 35 40 45 50 55 60 65 70 75 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 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 / rf2 driven 105c / rf1 driven - 40c / rf2 driven 25c / rf2 driven 105c / rf2 driven 10 20 30 40 50 60 70 80 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 50mhz to 60 00mhz voltage variable rf attenuator 16 rev 4 , january 2017 f 2250nlgk datasheet p ackag e d rawing (3 x 3 16 pin )
voltage variable rf attenuator 50mhz to 60 00mhz voltage variable rf attenuator 17 rev 4 , january 2017 f 2250nlgk datasheet p inout & b lock d iagram g n d 1 4 3 2 n c n c r f 1 r f 2 1 2 9 1 0 n c 1 1 n c g n d c o n t r o l g n d g n d g n d 5 6 7 8 g n d 1 3 g n d 1 4 1 5 1 6 v d d v m o d e v c t r l e . p .
voltage variable rf attenuator 50mhz to 60 00mhz voltage variable rf attenuator 18 rev 4 , january 2017 f 2250nlgk datasheet p in d escription pin name function 1, 5, 6, 7, 8, 12 , 13 gnd ground these pins as close to the device as possible. 2, 4, 9, 11 nc no internal connection . these pins can be left unconnected or connected to ground (recommended). 3 rf1 rf port 1. matched to 50 ohms. must u se an external ac coupling capacitor as close to the device as possible. for low frequency operation increase the capacitor value to result in a low reactance at the frequency of interest. 10 rf2 rf port 2. matched to 50 ohms. must u se an external ac coupling capacitor as close to the device as possible. 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 . see application section for details about v ctrl . 15 v dd power supply input. bypass to gnd with capacitors close as possible to pin. 16 v mode attenuator slope control. set to logic low to enable negative attenuation slope. set to logic high to enable positive attenuation slope. ep exposed pad. internally connected to gnd. solder this exposed pad to a pcb pad that uses multiple ground vias to achieve the specified rf performance.
voltage variable rf attenuator 50mhz to 60 00mhz voltage variable rf attenuator 19 rev 4 , january 2017 f 2250nlgk datasheet a pplications i nformation default start - up v mode must be tied to either gnd or logic high. if v ctrl pin is left floating, the part will power up in the minimum attenuation state when v mode = gnd, or the maximum attenuation state when v mode = high . v ctrl the v ctr l pin is used to control the atte nuation of the f2250 . with v mode set to a logic low (high) this places the device in a negative (positive) slope mode where increasing (decreasing) voltage produces an increasing ( a decreasing) attenuation from min attenuation (max a ttenuation) to max attenuati on (min attenuation ) respec tively. the v ctrl pin has an on - chip pullup esd diode so v dd should be applied before v ctrl is applied. if this sequencing is not possible , then r esistor r2 should be set for 1k ? to limit the current into the v ctr l 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 negative (positive) slope is defined as increased (decreased) attenuation with increasing (decreasing) v ctrl volta ge. the evkit provides and on - board jumper to manually set the v mode. installing a jumper on header j2 from vmode to gnd (vhi) to set the device for a negative (positive) slope. rf1 and rf2 ports the f2250 is a bi - directional device thus allowing rf1 or rf2 to be used as the rf input. as displayed in the typical operating conditions curves , rf1 shows some enh a nced linearity per f or mance and therefore should be used as the rf input , if possible , for best results . this f2250 has been des ign ed t o accept high rf input power levels, therefore v dd must be applied prior to the application of rf power to ensure reliability. dc blocking capacitors are required on the rf pins and should be set to a value that results in a low reactance over the frequency range of interest. power supplies the supply pin should be bypassed with external capacitors to minimize noise and fast transients. supply noise can degrade noise figure and fast transients can trigger esd clamps and cause them to fail. supply voltage change or transients should have a slew rate smaller than 1v/20us. in addition, all control pins should remain at 0v (+/ - 0.3v) while the supply vol tage ramps or while it returns to zero.
voltage variable rf attenuator 50mhz to 60 00mhz voltage variable rf attenuator 20 rev 4 , january 2017 f 2250nlgk datasheet control pin interface if control signal integrity is a concern and clean signals cannot be guaranteed due to overshoot, undershoot, ringing, etc., the following circuit at the input of control pins 14 and 16 is re commended as shown below. 1 4 3 2 1 2 9 1 0 1 1 c o n t r o l 5 6 7 8 1 3 1 4 1 5 1 6 v m o d e 2 p f 5 k o h m 2 p f 5 k o h m v c t r l v d d r f 1 r f 2
voltage variable rf attenuator 50mhz to 60 00mhz voltage variable rf attenuator 21 rev 4 , january 2017 f 2250nlgk datasheet ev kit / a pplications c ircuit
voltage variable rf attenuator 50mhz to 60 00mhz voltage variable rf attenuator 22 rev 4 , january 2017 f 2250nlgk datasheet ev kit p icture / l ayout (t op side ) rf 2 rf 1 v ctrl v dd short gnd pin to vmode pin to set for negative attenuation slope . for positive attenuation slope move shorting shunt from vmode to vhi
voltage variable rf attenuator 50mhz to 60 00mhz voltage variable rf attenuator 23 rev 4 , january 2017 f 2250nlgk datasheet ev kit p icture / l ayout (b ottom s ide ) rf 2 v dd rf 1 v ctrl
voltage variable rf attenuator 50mhz to 60 00mhz voltage variable rf attenuator 24 rev 4 , january 2017 f 2250nlgk datasheet ev kit bom t op m arkings 04 y 446 l f 2250 part number date code [ yww ] ( week 46 of 2014 ) lot code assembler code

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