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intermediate frequency digital variable gain amplifier idtf1200 revo page 1 of 13 april, 2011 datasheet g eneral d escription the idtf1200 is a digitally controlled intermediate frequency differential variable gain amplifier for basestation and other commercial applications with a low if frequency. the device offers extremely low noise figure over the entire gain control range. the device is packaged in compact 5x5 thin qfns with 200 ohm differential input and output impedances for ease of integration into the receiver lineup. versions covering if frequencies up to 300 mhz with low distortion are available. c ompetitive a dvantage the f1200 acts to enhance system snr when vga gain is reduced. the f1200 noise figure (nf) degrades only slightly (nf slope ~ -0.16 db / db ) over a 13 db control range while holding the output ip3 approximately constant. the resultant improvement in noise can enhance the system snr up to 2 decibels at low gain settings relative to a standard vga. the device has excellent dnl and inl simplifying digital compensation. the device also offers the extremely low harmonic, im2, and im3 distortion necessary to drive an adc directly in an if sub-sampling application. a pplications ? basestation diversity receivers ? digital pre-distortion ? ? wave point-to-point radios ? public safety receivers p art # m atrix part# gain range ip3 o if freq range nf f1200 22 to -1 48 50 - 160 2.6 f1206* 20 to -11 47 150 - 250 3.6 f1207* 20 to -11 46 230 - 300 3.7 *future product f eatures ? ideal for high snr systems ? 22 db typ maximum gain ? 23 db gain control range ? 7 bit parallel control ? 0.25 db gain steps ? excellent n n o o i i s s e e f f i i g g u u r r e e < < 3 3 . . 0 0 d d b b ? 5mm x 5mm 28 pin package ? 200 differential input ? 2 00 differential output ? ? n n f f d d e e g g r r a a d d e e s s < < 2 2 d d b b @ @ 1 1 2 2 d d b b r r e e d d u u c c e e d d g g a a i i n n ? 50 mhz ? 160 mhz frequency range ? ? ultra-linear: i i p p 3 3 o o + + 4 4 8 8 d d b b m m t t y y p p i i c c a a l l ? external current setting resistor ? fast gain step settling < 20 nsec d evice b lock d iagram ` ` decode logic v cc attn in amp out bias control gain control v cc attn out amp in i set v mode 7 stby o rdering i nformation idt f 12 00 nb gi8 0.75 mm height package green industrial temp range tape & reel omit idt prefix rf product line idt proprietary
intermediate frequency digital variable gain amplifier idtf1200 revo page 2 of 13 april, 2011 datasheet a bsolute m aximum r atings v cc to gnd -0.3v to +5.5v all other pins to gnd -0.3v to (v cc +0.25v) i set to gnd -0.3v to +2.2v rf input power (attn_in+, attn_in-) @g max +10 dbm continuous power dissipation 1.5w ja (junction ? ambient) +41c/w jc (junction ? case) the case is defined as the exposed paddle +4c/w operating temperature range (case temperature) t c = -40c to +85c maximum junction temperature 150c storage temperature range -65c to +150c lead temperature (soldering, 10s) . +260c k ey f eature ? n oise f igure s lope standard variable gain amplifiers exhibit a [nf/gain] slope of -1 db/db. practically speaking, as gain is reduced, noise figure degrades db for db. the f1200 utilizes new technology that flattens the noise figure response (~ -0.16 db/db) for most of the gain control range while keeping distortion (output ip3) constant. the result is that nf is improved up to 16 db vs. a standard vga at low gain settings. the graph below illustrates this by showing the idtf1200 nf and ip3o vs. gain setting contours. 0 5 10 15 20 25 30 35 40 45 50 -2 0 2 4 6 8 10 12 14 16 18 20 22 gain (db) n f ( d b ) a n d o u t p u t i p 3 ( d b m ) output ip3 noise figure idt proprietary
intermediate frequency digital variable gain amplifier idtf1200 revo page 3 of 13 april, 2011 datasheet idtf1200 s pecification v cc = +5.0v, f rf = 100mhz , t c = +25c, stby = gnd, r6 = 2.87k +/-1%, p out = +3 dbm, unless otherwise noted in the condition column. evkit trace, transformer & matching losses are de-embedded for specification purposes (note: de-embedded losses = 0.4db input and 0.4db output at 100mhz). parameter condition symbol min typ max units operating temp. range case temperature measured at the exposed paddle t c -40 to +85 c logic input high v ih 2.0 1 v logic input low v il 0.8 v logic current i ih, i il -1 +1 a operating voltage range analog & digital supplies v cc 4.75 to 5.25 v supply current total, all v cc; r6= 2.87k +/-1% i supp 103 110 117 ma standby current total, all v cc ? all digital inputs at 2.0vdc ? vcc=5.25vdc i stby 2.5 ma frequency range output ip3 > +40 dbm f rf 50 to 160 mhz input resistance differential r in 200 output resistance differential r out 200 maximum gain gc = [0000000] g max 20.7 21.7 22.6 db minimum gain gc = [1011101] g min -2.8 -1.7 -0.7 db gain step lsb 0.25 db phase slope ? due to change in gain slope 0.3 deg/db differential gain error between adjacent 1db steps dnl .05 db integral gain error error vs. straight line inl +/-0.20 db noise figure at maximum gain nf 2.6 db noise figure gc = [0110100] (gain = 9db) nf back 4.55 db output ip3 ? set code = 0000000, (g max ) ? pout = +3 dbm per tone ? 800 khz tone separation ip3 o1 48 dbm output ip3 ? at gback ? set code = 0110100 , , (gain = 9db) ? pout = +3 dbm per tone ? 800 khz tone separation ip3 o2 44 dbm settling time ? gain step from 22 to 21 db setting ? settles to within 0.1 db of final value ? f rf = 100 mhz t 1db 15 2 nsec 2 nd harmonic ? set code = 0000000, (g max ) ? pout = +3 dbm h2 -82 dbc # control bits parallel cb 7 # 1 db compression ? set code = 0000000, (g max ) ? single tone test p1db o +16.7 +19.4 dbm 1 ?items in bold italics are guaranteed by test 2 ? see graph on page 8 idt proprietary
intermediate frequency digital variable gain amplifier idtf1200 revo page 4 of 13 april, 2011 datasheet t ypical o perating p arametric c urves (g max , 5.00v, 25c, p out +3 dbm, 100mhz unless otherwise noted) gain vs. temperature 0 5 10 15 20 25 0 50 100 150 200 250 300 frequency (mhz) g a i n ( d b ) -40c 25c 85c s11 vs. temperature -50 -40 -30 -20 -10 0 0 50 100 150 200 250 300 frequency (mhz) i n p u t g a m m a [ s 1 1 ] ( d b ) -40c 25c 85c s12 vs. temperature -50 -40 -30 -20 -10 0 0 50 100 150 200 250 300 frequency (mhz) r e v e r s e i s o l a t i o n [ s 1 2 ] ( d b ) -40c 25c 85c gain vs. voltage 0 5 10 15 20 25 0 50 100 150 200 250 300 frequency (mhz) g a i n ( d b ) 4.75v 5.00v 5.25v s22 vs. temperature -50 -40 -30 -20 -10 0 0 50 100 150 200 250 300 frequency (mhz) o u t p u t g a m m a [ s 2 2 ] ( d b ) -40c 25c 85c gain and nf vs. frequency (measured w/nf meter) 0 2 4 6 8 10 12 14 16 18 20 22 24 30 50 70 90 110 130 150 170 frequency (mhz) g a i n a n d n f ( d b ) gain noise figure idt proprietary
intermediate frequency digital variable gain amplifier idtf1200 revo page 5 of 13 april, 2011 datasheet toc s continued s11 vs. gain setting -50 -45 -40 -35 -30 -25 -20 -15 -10 -5 0 -1 3 7 11 15 19 23 gain setting (db) i n p u t g a m m a ( d b ) 50 mhz 100 mhz 150 mhz s21 vs. gain setting -2 0 2 4 6 8 10 12 14 16 18 20 22 -1 3 7 11 15 19 23 gain setting (db) g a i n ( d b ) 50 mhz 100 mhz 150 mhz evkit nf & output ip3 correction -1.6 -1.2 -0.8 -0.4 0.0 0.4 0.8 1.2 1.6 0 50 100 150 200 250 300 frequency (mhz) c o r r e c t i o n ( d b ) nf correction ip3 correction correct evkit measured noise figure by this amount to account for trace & transformer losses correct evkit measured output ip3 by this amount to account for trace & transformer losses s22 vs. gain setting -50 -45 -40 -35 -30 -25 -20 -15 -10 -5 0 -1 3 7 11 15 19 23 gain setting (db) o u t p u t g a m m a ( d b ) 50 mhz 100 mhz 150 mhz s21 phase vs. gain setting -10 -5 0 5 10 15 20 25 30 35 40 -1 3 7 11 15 19 23 gain setting (db) n o r m a l i z e d s 2 1 p h a s e r e s p o n s e ( d e g r e e s ) 50 mhz 100 mhz 150 mhz evkit gain correction 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 0 50 100 150 200 250 300 frequency (mhz) e v k i t l o s s ( d b ) correct evkit measured gain by this amount to account for trace & transformer losses idt proprietary
intermediate frequency digital variable gain amplifier idtf1200 revo page 6 of 13 april, 2011 datasheet toc s continued dnl vs. frequency (1db steps) -0.20 -0.15 -0.10 -0.05 0.00 0.05 0.10 0.15 0.20 -1 1 3 5 7 9 11 13 15 17 19 21 gain setting (db) d i f f e r e n t i a l n o n - l i n e a r i t y ( d b ) . 30 mhz 50 mhz 80 mhz 100 mhz 120 mhz dnl vs. temperature (100 mhz, 1db steps) -0.20 -0.15 -0.10 -0.05 0.00 0.05 0.10 0.15 0.20 -1 1 3 5 7 9 11 13 15 17 19 21 gain setting (db) d i f f e r e n t i a l n o n - l i n e a r i t y ( d b ) 85c 25c -40c dnl vs. temperature (100 mhz, 0.25db steps) -0.20 -0.15 -0.10 -0.05 0.00 0.05 0.10 0.15 0.20 -1 1 3 5 7 9 11 13 15 17 19 21 gain setting (db) d i f f e r e n t i a l n o n - l i n e a r i t y ( d b ) 85c 25c -40c dnl vs. voltage (100 mhz, 1db steps) -0.20 -0.15 -0.10 -0.05 0.00 0.05 0.10 0.15 0.20 -1 1 3 5 7 9 11 13 15 17 19 21 gain setting (db) d i f f e r e n t i a l n o n - l i n e a r i t y ( d b ) 4.75v 5.00v 5.25v dnl vs. temperature (100 mhz, 0.5db steps) -0.20 -0.15 -0.10 -0.05 0.00 0.05 0.10 0.15 0.20 -1 1 3 5 7 9 11 13 15 17 19 21 gain setting (db) d i f f e r e n t i a l n o n - l i n e a r i t y ( d b ) 85c 25c -40c inl vs. frequency -0.40 -0.30 -0.20 -0.10 0.00 0.10 0.20 0.30 0.40 -1 1 3 5 7 9 11 13 15 17 19 21 gain setting (db) c u m u l a t i v e g a i n e r r o r ( d b ) 50 mhz 100 mhz 120 mhz idt proprietary
intermediate frequency digital variable gain amplifier idtf1200 revo page 7 of 13 april, 2011 datasheet toc s continued inl vs. temperature (100 mhz) -0.40 -0.30 -0.20 -0.10 0.00 0.10 0.20 0.30 0.40 -1 1 3 5 7 9 11 13 15 17 19 21 gain setting (db) c u m u l a t i v e g a i n e r r o r ( d b ) 85c 25c -40c noise figure vs. frequency 0 2 4 6 8 10 12 14 16 18 20 -1 1 3 5 7 9 11 13 15 17 19 21 gain setting (db) n o i s e f i g u r e ( d b ) 50 mhz 150 mhz 100 mhz noise figure vs. temperature (100 mhz) 0 2 4 6 8 10 12 14 16 18 20 -1 1 3 5 7 9 11 13 15 17 19 21 gain setting (db) n o i s e f i g u r e ( d b ) -40c 85c 25c inl vs. voltage (100 mhz) -0.40 -0.30 -0.20 -0.10 0.00 0.10 0.20 0.30 0.40 -1 1 3 5 7 9 11 13 15 17 19 21 gain setting (db) c u m u l a t i v e g a i n e r r o r ( d b ) 4.75v 5.00v 5.25v noise figure vs. voltage (100 mhz) 0 2 4 6 8 10 12 14 16 18 20 -1 1 3 5 7 9 11 13 15 17 19 21 gain setting (db) n o i s e f i g u r e ( d b ) 5.25v 4.75v 5.00v output p1db vs. voltage 14 15 16 17 18 19 20 21 22 23 24 80 mhz 100 mhz 120 mhz frequency (mhz) o u t p u t p 1 d b ( d b m ) 5.25v 4.75v 5.00v idt proprietary
intermediate frequency digital variable gain amplifier idtf1200 revo page 8 of 13 april, 2011 datasheet toc s c ontinued output ip3 vs. frequency 25 30 35 40 45 50 55 60 4.0e+07 6.0e+07 8.0e+07 1.0e+08 1.2e+08 1.4e+08 1.6e+08 frequency (hz) o u t p u t i p 3 ( d b m ) ip3- ip3+ output ip3 vs. temperature (100 mhz) 25 30 35 40 45 50 55 60 -1.25 10 22 gain setting (db) o u t p u t i p 3 ( d b m ) -40c 85c 25c settling time (16db step, 100 mhz) output ip3 vs. voltage (100 mhz) 25 30 35 40 45 50 55 60 -1.25 10 22 gain setting (db) o u t p u t i p 3 ( d b m ) 5.25v 4.75v 5.00v 2 nd harmonic vs. temperature (100 mhz) -100 -90 -80 -70 -60 -50 -1.25 10 22 gain setting (db) 2 n d h a r m o n i c w / + 3 p o u t ( d b c ) -40c 85c 25c settling time (1 db step, 100 mhz) idt proprietary
intermediate frequency digital variable gain amplifier idtf1200 revo page 9 of 13 april, 2011 datasheet p in d iagram package drawing 5 mm x 5 mm package dimension 3.25 mm x 3.25 mm exposed pad 0.5 mm pitch 28 pins 0.75 mm height 0.25 mm pad width 0.40 mm pad length top view (looking through the top of the package) attn_in - attn_in + a t t n _ o u t + a t t n _ o u t - a m p _ i n + a m p _ i n - amp_out - amp_out + v cc dig i set gnd gnd gnd v mode g c 6 stby v cc attn e _ a m p gnd exposed pad v c c a m p _ b i a s b i a s _ a m p g c 5 g c 4 g c 3 g c 2 g c 1 g c 0 dig_gnd 7 3 2 1 5 4 6 21 17 16 15 19 18 20 14 10 9 8 12 11 13 28 24 23 22 26 25 27 c o 0 . 3 5 m m idt proprietary
intermediate frequency digital variable gain amplifier idtf1200 revo page 10 of 13 april, 2011 datasheet p ackage d rawing idt proprietary
intermediate frequency digital variable gain amplifier idtf1200 revo page 11 of 13 april, 2011 datasheet p in d escriptions pin # pin name function 1 gnd 2 v cc _attn attenuator power supply 3 attn_in+ attenuator_0 differential input p 4 attn_in- attenuator_0 differential input m 5 ground untested - spi chip select input 6 ground untested - spi data input 7 ground untested - spi clock input 8 gc6 parallel gain control input ? msb (16 db step) 9 gc5 parallel gain control input 10 gc4 parallel gain control input 11 gc3 parallel gain control input 12 gc2 parallel gain control input 13 gc1 parallel gain control input 14 gc0 parallel gain control input ? lsb (0.25 db step) 15 v cc _dig digital circuit power supply 16 dig_gnd connect directly to ground 17 v mode untested ? spi enable connect to pcb gnd for normal parallel operation 18 amp_out+ amplifier differential output p 19 amp_out- amplifier differential output m 20 stby amplifier power down. ground for normal operation 21 i set current setting resistor. connect recommended value (2.87k) to ground. use 1% tolerance 22 v cc _amp_bias amplifier and bias circuit power supply 23 bias_amp amplifier bias external pin for decoupling capacitor 24 amp_in+ amplifier differential input p 25 e_amp amplifier common emitter 26 amp_in- amplifier differential input m 27 attn_out- attenuator_0 differential output m 28 attn_out+ attenuator_0 differential output p exposed paddle idt proprietary
intermediate frequency digital variable gain amplifier idtf1200 revo page 12 of 13 april, 2011 datasheet ev kit / a pplications c ircuit s chematic the diagram below describes the recommended applications / evkit circuit: r6 c19 vcc c10 vcc c4 l1 l2 vcc c17 vcc coilcraft 1008cs t2 jp1 vcc r4 attn_in - attn_in + a t t n _ o u t + a t t n _ o u t - a m p _ i n + a m p _ i n - amp_out - amp_out + v cc dig i set gnd [clk] gnd [data] gnd [cs] v mode g c 6 stby v cc attn e _ a m p gnd v c c a m p _ b i a s b i a s _ a m p g c 5 g c 4 g c 3 g c 2 g c 1 g c 0 dig_gnd 7 3 2 1 5 4 6 21 17 16 15 19 18 20 14 10 9 8 12 11 13 28 24 23 22 26 25 27 t1 spi (untested) decode logic bias control jp3 r13 vcc jp5 13 11 9 7 5 3 1 c11 c8 c9 r11 c20 c23 c13 c24 c1 c2 c21 vcc c22 2 4 6 8 10 12 14 vcc r14 r15 r16 r17 r18 r19 r20 gc6 gc5 gc4 gc3 gc2 gc1 gc0 idt proprietary
intermediate frequency digital variable gain amplifier idtf1200 revo page 13 of 13 april, 2011 datasheet evk it & bom (email: rfsupport@idt.com to request controller sw and cable) the picture and table below describes the recommended evkit operation and bom 5x5 qfn 5x5 qfn device device evb serial # evb serial # output 4:1 balun output 4:1 balun transformer transformer dc power dc power power up: power up: ? ? closed = on closed = on ? ? open = off open = off pullup pullup inductors inductors v v mode mode ? ? closed = parallel control closed = parallel control ? ? open = serial control* open = serial control* attn_in attn_in 50 50 amp_out amp_out 50 50 gc [0 gc [0 - - 6] 6] spi* spi* input 4:1 balun input 4:1 balun transformer transformer * serial mode untested, not guaranteed to work v v cc cc ref / monitor ref / monitor i i set set item # value size desc mfr. part # mfr. ref des 1 4:1 balun sm-22 4:1 center tap balun tc4-1tg2+ mini circuits t1,t2 2 2.87k 0402 res 2.87k ohm 1/10w 1% 0402 smd erj-2rkf2871x panasonic r6 3 47k 0402 pullup resistors for stby and vmode jumpers rc0402fr-0747kl yageo r4, r13 4 0 0402 res 0.0 ohm 1/10w 0402 smd erj-2ge0r00x panasonic r11 5 680 nh 1008 rf inductor, ceramic core, 5% tol, smt, rohs 1008cs-681xjlc coilcraft l1,l2 6 10 nf 0402 cap cer 10000pf 16v 10% x7r 0402 GRM155R71C103KA01D murata c1,c2,c8,c23,c24 7 1000 pf 0402 cap cer 1000pf 50v c0g 0402 grm1555c1h102ja01d murata c4,c10,c13,c19 8 0.1uf 0402 cap cer .1uf 10v 10% x5r 0402 grm155r61a104ka01d murata c9,c11,c17,c20 9 sma .062 sma_end_launch 142-0711-821 emerson johnson j1,j2,j3 10 header_2pin th_2 conn header vert sgl 2pos gold 961102-6404-ar 3m jp1,jp3 11 header_14pin th_7x2 conn header 14 pos strght gold n2514-6002-rb 3m jp5 12 f1200zd qfn-28 if vga q01b005m idt u1 13 pcb f1200 ev kit rev 1 14 dnp 0402 resistors to ground on gain ctrl lines r14 thru r20 idt proprietary

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