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1 for more information www.linear.com/LTC6432-15 typical application features description 100khz to 1.4ghz differential adc driver/if amplifier the lt c ? 6432-15 is an ultra-high dynamic range differen - tial gain block amplifier designed to drive high resolution, high speed adcs. it offers a full ghz of data bandwidth for complex spectrally efficient modulations schemes or where resistance to blockers is critical. this unique device can simultaneously achieve low noise, incomparable linearity and flat gain over the 100khz to 1ghz band. unlike wideband gaas phemts, mesfets and gan fets, this sige based amplifier exhibits low 1/f noise and can be used down to 100khz. the ltc6432 -15 is designed for ease of use requiring a minimum of support components. impedance matching, temperature compensation and bias control are handled internally to ensure consistent performance over environ - mental changes. all a-grade ltc6432 -15 devices are tested and guaran- teed for oi p3 at 150mhz . the ltc6432 -15 is housed in a 4mm 4mm , 24l, qfn package with an exposed pad for thermal management and low inductance. for a single-ended 50 if gain block with similar perfor - mance, see the related ltc6433-15. oip3 and s21 vs frequency applications n 100khz to 1400mhz bandwidth n 54.4dbm oip3 at 1mhz into a 100 diff load n 48.0dbm oip3 at 150mhz into a 100 diff load n up to 15dbm output power n nf = 3.0db at 240mhz n low 1/f noise corner n user defined low frequency n 15.2db fixed power gain n a-grade 100% oip3 tested at 150mhz n 0.8 nv/ hz total input noise n >2.75v p-p linear output swing n p1db = 22.5dbm n insensitive to v cc variation n input/output internally matched to 100 differential n single 5v supply n dc power = 850mw n unconditionally stable n differential 1ghz bandwidth adc driver n wideband test instrument amplifier n differential if amplifier n 50/75 balanced if amplifier l , lt, ltc, ltm, linear technology and the linear logo are registered trademarks of analog devices, inc. all other trademarks are the property of their respective owners. 643215 ta01a ?out ?in gnd gnd 1f LTC6432-15 v cc dnc dnc +fdbk v cc v cc = 5v dnc dnc ?fdbk dnc t_diode dnc dnc nfilt2 dnc dnc dnc gnd +out +in 1f nfilt1 1f input 1f 350 250 470h 280 240nh 1f 1f 1nf 1f 1:2 1:1 balun 1f 350 1f 1f 1f 280 240nh 250 470h ?in +in ?out +out lp filter ?in +in 16-bit adc lt c6432 -15 643215f 1 10 100 1k 0 10 20 30 40 50 v cc = 5v 60 0 10 20 30 40 50 60 output intercept pt. oip3 (dbm) gain s21 (db) p out = 4dbm/tone 643215 ta01b z in = z out = 100 diff t case = 30c oip3 s21 frequency (mhz) 0.1
2 for more information www.linear.com/LTC6432-15 pin configuration absolute maximum ratings total supply voltage (v cc to gnd) ........................... 5.5v amplifier output current (+out) ......................... 10 5ma amplifier output current (C out) ......................... 10 5ma rf input power, continuous, 50 (note 2) ........ + 15dbm rf input power, 100s pulse, 50 (note 2) ...... + 2 0dbm operating case temperature range (t case ) .......................................... C 40 c to 85 c storage temperature range .................. C 65 c to 150 c junction temperature (t j ) .................................... 150 c lead temperature (soldering, 10 sec) ................... 30 0 c (note 1) 24 23 22 21 20 19 7 8 9 top view uf package 24-lead (4mm 4mm) plastic qfn 25 gnd 10 11 12 6 5 4 3 2 1 13 14 15 16 17 18 dnc dnc dnc dnc nfilt2 nfilt1 +out gnd dnc t_diode dnc ?out +in gnd v cc dnc dnc +fdbk ?in gnd v cc dnc dnc ?fdbk t jmax = 150c, jc = 40c/w exposed pad (pin 25) is gnd, must be soldered to pcb. case tempera ture is measured on the backside of the pcb. order information dc electrical characteristics the l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at t a = 25c, v cc = 5v, z source = z load = 100. typical measured dc electrical performance using test circuit a (note 3). lead free finish tape and reel part marking* package description temperature range (t case ) ltc6432aiuf-15#pbf ltc6432aiuf-15#trpbf 43215 24-lead (4mm 4mm) plastic qfn C40c to 85c ltc6432biuf-15#pbf ltc6432biuf-15#trpbf 43215 24-lead (4mm 4mm) plastic qfn C40c to 85c consult ltc marketing for parts specified with wider operating temperature ranges. *the temperature grade is identified by a label on the shipping container. for more information on lead free part marking, go to: http://www.linear.com/leadfree/ for more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/. some packages are available in 500 unit reels through designated sales channels with #trmpbf suffix. the LTC6432-15 is available in two grades. grade a guarantees a minimum oip3 at 150mhz while grade b does not. a- and b-grades are identified by a label on the shipping container. http://www.linear.com/product/LTC6432-15#orderinfo symbol parameter conditions min typ max units v s operating supply range 4.75 5 5.25 v i s,tot total supply current all v cc pins plus +out and Cout. l 145 110 166 195 220 ma ma i s,out total supply current to out pins current to +out and Cout l 130 100 152 185 200 ma ma i vcc current to v cc pin either v cc pin may be used l 13 12.5 14 17 17.5 ma ma lt c6432 -15 643215f
3 for more information www.linear.com/LTC6432-15 ac electrical characteristics symbol parameter conditions min typ max units small signal bw C3db bandwidth de-embedded to package w ext. 1f fdbk capacitor 0.1 2000 mhz s11 differential input match, 100khz to 1400mhz de-embedded to package w ext. 1f fdbk capacitor C10 db s21 forward differential power gain, 100khz to 400mhz de-embedded to package w ext. 1f fdbk capacitor 15.1 db s12 reverse differential isolation, 100khz to 4000mhz de-embedded to package w ext. 1f fdbk capacitor C19 db s22 differential output match, 100khz to 1400mhz de-embedded to package w ext. 1f fdbk capacitor C10 db frequency = 100khz s21 differential power gain de-embedded to package w ext. 1f fdbk capacitor 16.0 db oip3 output third-order intercept point p out = 2dbm/tone, ?f = 1mhz, z o = 100 grade a grade b 50.5 47 dbm dbm im3 third-order intermodulation p out = 2dbm/tone, ?f = 1mhz, z o = 100 grade a grade b C97 C90 dbc dbc hd2 second harmonic distortion p out = 8dbm C85 dbc hd3 third harmonic distortion p out = 8dbm C61 dbc p1db output 1db compression point 22.5 dbm nf noise figure de-embedded to package for balun input loss 6.6 db frequency = 1mhz s21 differential power gain de-embedded to package w ext. 1f fdbk capacitor 15.9 db oip3 output third-order intercept point p out = 2dbm/tone, ?f = 1mhz, z o = 100 grade a grade b 54.5 51 dbm dbm im3 third-order intermodulation p out = 2dbm/tone, ?f = 1mhz, z o = 100 grade a grade b C105 C98 dbc dbc hd2 second harmonic distortion p out = 8dbm C99.5 dbc hd3 third harmonic distortion p out = 8dbm C66.8 dbc p1db output 1db compression point 22.5 dbm nf noise figure de-embedded to package for balun input loss 3.9 db frequency = 10mhz s21 differential power gain de-embedded to package w ext. 1f fdbk capacitor 15.9 db oip3 output third-order intercept point p out = 2dbm/tone, ?f = 1mhz, z o = 100 grade a grade b 50.1 47 dbm dbm im3 third-order intermodulation p out = 2dbm/tone, ?f = 1mhz, z o = 100 grade a grade b C96.2 C90 dbc dbc hd2 second harmonic distortion p out = 8dbm C88.8 dbc hd3 third harmonic distortion p out = 8dbm C84 dbc p1db output 1db compression point 22.7 dbm nf noise figure de-embedded to package for balun input loss 3.6 db the l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at t case = 30c (note 3). v cc = 5v, z source = z load = 100, unless otherwise noted, measurements are performed using test circuit a, measuring from 50 sma to 50 sma without de-embedding (note 4). lt c6432 -15 643215f
4 for more information www.linear.com/LTC6432-15 ac electrical characteristics symbol parameter conditions min typ max units frequency = 50mhz s21 differential power gain de-embedded to package w ext. 1f fdbk capacitor 15.9 db oip3 output third-order intercept point p out = 2dbm/tone, ?f = 1mhz, z o = 100 grade a grade b 48.0 45 dbm dbm im3 third-order intermodulation p out = 2dbm/tone, ?f = 1mhz, z o = 100 grade a grade b C92 C86 dbc dbc hd2 second harmonic distortion p out = 8dbm C85.5 dbc hd3 third harmonic distortion p out = 8dbm C90.5 dbc p1db output 1db compression point 22.9 dbm nf noise figure de-embedded to package for balun input loss 2.9 db frequency = 150mhz s21 differential power gain de-embedded to package w ext. 1f fdbk capacitor l 14.5 14.2 15.9 16.5 16.8 db oi p3 output third-order intercept point p out = 2dbm/tone, ?f = 8mhz, z o = 100 grade a grade b 47.0 50.3 47 dbm dbm im3 third-order intermodulation p out = 2dbm/tone, ?f = 8mhz, z o = 100 grade a grade b C96.6 C90 dbc dbc hd2 second harmonic distortion p out = 8dbm C92.2 dbc hd3 third harmonic distortion p out = 8dbm C86.5 dbc p1db output 1db compression point 22.7 dbm nf noise figure de-embedded to package for balun input loss 3.2 db frequency = 240mhz s21 differential power gain de-embedded to package w ext. 1f fdbk capacitor 15.8 db oip3 output third-order intercept point p out = 2dbm/tone, ?f = 1mhz, z o = 100 grade a grade b 45 42 dbm dbm im3 third-order intermodulation p out = 2dbm/tone, ?f = 1mhz, z o = 100 grade a grade b C86 C80 dbc dbc hd2 second harmonic distortion p out = 8dbm C93.7 dbc hd3 third harmonic distortion p out = 8dbm C81.5 dbc p1db output 1db compression point 22.6 dbm nf noise figure de-embedded to package for balun input loss 3.4 db frequency = 300mhz s21 differential power gain de-embedded to package w ext. 1f fdbk capacitor 15.8 db oip3 output third-order intercept point p out = 2dbm/tone, ?f = 1mhz, z o = 100 grade a grade b 43.5 40 dbm dbm im3 third-order intermodulation p out = 2dbm/tone, ?f = 1mhz, z o = 100 grade a grade b C83 C76 dbc dbc hd2 second harmonic distortion p out = 8dbm C90.7 dbc hd3 third harmonic distortion p out = 8dbm C81.4 dbc p1db output 1db compression point 22.5 dbm nf noise figure de-embedded to package for balun input loss 3.6 db the l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at t case = 30c (note 3). v cc = 5v, z source = z load = 100, unless otherwise noted, measurements are performed using test circuit a, measuring from 50 sma to 50 sma without de-embedding (note 4). lt c6432 -15 643215f
5 for more information www.linear.com/LTC6432-15 note 1: stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device. exposure to any absolute maximum rating condition for extended periods may affect device reliability and lifetime. note 2: guaranteed by design and characterization. this parameter is not tested. note 3: the LTC6432-15 is guaranteed functional over the case operating temperature range of C40 c to 85c. note 4: small signal parameters s and noise are de-embedded to the package pins, while large signal parameters are measured directly from the test circuit. ac electrical characteristics symbol parameter conditions min typ max units frequency = 500mhz s21 differential power gain de-embedded to package w ext. 1f fdbk capacitor 15.4 db oip3 output third-order intercept point p out = 2dbm/tone, ?f = 1mhz, z o = 100 grade a grade b 41 39 dbm dbm im3 third-order intermodulation p out = 2dbm/tone, ?f = 1mhz, z o = 100 grade a grade b C78 C74 dbc dbc hd2 second harmonic distortion p out = 8dbm C82.9 dbc hd3 third harmonic distortion p out = 8dbm C67.4 dbc p1db output 1db compression point 21.9 dbm nf noise figure de-embedded to package for balun input loss 3.9 db frequency = 1000mhz s21 differential power gain de-embedded to package w ext. 1f fdbk capacitor 14.6 db oip3 output third-order intercept point p out = 2dbm/tone, ?f = 1mhz, z o = 100 grade a grade b 36 33 dbm dbm im3 third-order intermodulation p out = 2dbm/tone, ?f = 1mhz, z o = 100 grade a grade b C68 C62 dbc dbc hd2 second harmonic distortion p out = 8dbm C67.2 dbc hd3 third harmonic distortion p out = 8dbm C57.5 dbc p1db output 1db compression point 19.2 dbm nf noise figure de-embedded to package for balun input loss 4.8 db the l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at t case = 30c (note 3). v cc = 5v, z source = z load = 100, unless otherwise noted, measurements are performed using test circuit a, measuring from 50 sma to 50 sma without de-embedding (note 4). lt c6432 -15 643215f
6 for more information www.linear.com/LTC6432-15 typical performance characteristics differential s parameters vs frequency differential stability factor k vs frequency over temperature differential noise figure vs frequency over temperature differential input match (s11 dd ) vs frequency over temperature differential gain (s21 dd ) vs frequency over temperature differential reverse isolation (s12 dd ) vs frequency over temperature differential output match (s22 dd ) vs frequency over temperature common mode gain (s21 cc ) vs frequency over temperature cm to dm gain (s21 dc ) vs frequency over temperature t case = 30c,v cc = 5v, z in = z out = 100 diff. unless otherwise noted, measurements are performed using test circuit a, measuring from 50 sma to 50 sma without de-embedding. lt c6432 -15 643215f 100m t case = 50c t case = 85c t case = 100c frequency (hz) 100k 1m 10m 100m 1g 2g 1g ?30 ?25 ?20 ?15 ?10 ?5 0 magnitude s21 dc (db) 643215 g09 frequency (hz) 5g 100k 1m 10m 100m 1g 2g 10 11 12 13 ?40 14 15 16 17 18 19 20 magnitude s21 dd (db) 643215 g05 t case = ?40c ?30 t case = ?20c t case = 0c t case = 30c t case = 50c t case = 85c t case = 100c frequency (hz) 100k 1m 10m ?20 100m 1g 2g ?30 ?25 ?20 ?15 ?10 ?5 0 ?10 magnitude s12 dd (db) 643215 g06 t case = ?40c t case = ?20c t case = 0c t case = 30c t case = 50c t case = 85c t case = 100c t case = 85c 0 t case = 50c t case = 30c t case = 0c t case = ?20c t case = ?40c frequency (hz) 100k 1m 10m 100m 10 1g 2g 2 3 4 5 6 7 8 9 20 10 noise figure (db) 643215 g03 t case = ?40c t case = ?20c t case = 0c t case = 30c t case = 50c t case = 85c t case = 100c s11 magnitude (db) frequency (hz) 100k 1m 10m 100m 1g 5g 0 1 2 643215 g01 3 4 5 6 7 8 9 10 stability factor k (unitless) 643215 g02 frequency (hz) 100k 1m 10m 100m 1g 2g ?29 s21 ?26 ?23 ?20 ?17 ?14 ?11 ?8 ?5 magnitude s11 dd (db) 643215 g04 s12 t case = ?40c t case = ?20c t case = 0c t case = 30c t case = 50c t case = 85c t case = 100c frequency (hz) 100k 1m s22 10m 100m 1g 2g ?50 ?40 ?30 ?20 ?10 0 frequency (hz) magnitude s22 dd (db) 643215 g07 t case = ?40c t case = ?20c t case = 0c t case = 30c t case = 50c t case = 85c t case = 100c frequency (hz) 100k 100k 1m 10m 100m 1g 2g 0 2 4 6 1m 8 10 12 14 16 18 20 magnitude s21 cc (db) 643215 g08 t case = ?40c 10m t case = ?20c t case = 0c t case = 30c t case = 50c t case = 85c t case = 100c t case = ?40c t case = ?20c t case = 0c t case = 30c
7 for more information www.linear.com/LTC6432-15 typical performance characteristics oip3 vs frequency oip3 vs rf power out/tone over frequency oip3 vs supply voltage over frequency oip3 vs tone spacing over frequency oip3 vs frequency over temperature hd2 vs frequency over rf power out oip2 vs frequency hd3 vs frequency over rf power out t case = 30c,v cc = 5v, z in = z out = 100 diff. unless otherwise noted, measurements are performed using test circuit a, measuring from 50 sma to 50 sma without de-embedding. lt c6432 -15 643215f 100m 1m 10m 100m 1g ?100 ?80 ?60 ?40 ?20 0 1g 3rd harmonic (dbc) 643215 g17 rf pout = 6dbm rf pout = 8dbm rf pout = 10dbm v cc = 5v p out = 4dbm/tone z in = z 0 out = 100 diff t case = ?40c t case = ?20c t case = 0c t case = 30c t case = 60c t case = 85c frequency (hz) 100k 10 1m 10m 100m 1g 0 10 20 30 40 50 20 60 output intercept pt oip3 (dbm) 643215 g14 v cc = 5v z in = z out = 100 diff t case = 30c 100khz 500khz 1mhz 5mhz 30 10mhz 50mhz 200mhz 500mhz 1000mhz rf power out per tone (dbm) ?10 ?5 0 5 40 10 15 0 5 10 15 20 25 30 35 50 40 45 50 55 60 output intercept pt. oip3 (dbm) 643215 g11 p out /tone = 4dbm z in = z out = 100 diff t case = 30c 60 4.50v 4.75v 5.00v 5.25v 5.50v 5.75v frequency (hz) 100k 1m 10m output intercept pt. oip3 (dbm) 100m 1g 20 25 30 35 40 45 50 55 v cc = 5v 643215 g10 60 output intercept pt. oip3 (dbm) 643215 g12 p out /tone = 4dbm z in = z out = 100 diff t case = 30c 500khz 1mhz 10mhz 50mhz 100mhz 500mhz p out = 4dbm/tone 1000mhz tone spacing (hz) 10k 100k 1m 10m 100m 15 20 25 z in = z out = 100 diff 30 35 40 45 50 55 60 output intercept pt. oip3 (dbm) 643215 g13 v cc = 5v t case = 30c z in = z out = 100 diff t case = 30c rf pout = 6dbm rf pout = 8dbm rf pout = 10dbm fundamental frequency (hz) 100k 1m 10m 100m frequency (hz) 1g ?120 ?100 ?80 ?60 ?40 ?20 0 2nd harmonic (dbc) 643215 g15 100k v cc = 5v p out = 8dbm z in = z out = 100 diff t case = 30c frequency (hz) 100k 1m 10m 100m 1g 1m 60 70 80 90 100 110 120 2nd order output intercept pt. oip2 (dbm) 643215 g16 v cc = 5.0v 10m z in = z out = 100 diff t case = 30c fundamental frequency (hz) 100k
8 for more information www.linear.com/LTC6432-15 typical performance characteristics output power vs input power over frequency p1db vs frequency over supply voltage total current vs supply voltage total current vs rf power in total current vs temperature t case = 30c,v cc = 5v, z in = z out = 100 diff. unless otherwise noted, measurements are performed using test circuit a, measuring from 50 sma to 50 sma without de-embedding. lt c6432 -15 643215f 200mhz, p1db = 22.0dbm z in = z out = 100 diff t case = 30c z in = z out = 100 diff t case = 30c v cc = 4.5v v cc = 5.0v v cc = 5.5v frequency (mhz) 0.1 1 400mhz, p1db = 22.0dbm 10 100 1k 10.0 12.5 15.0 17.5 20.0 22.5 25.0 800mhz, p1db = 20.5dbm 1db compression pt. p1db (dbm) 643215 g19 rf power in (dbm) ?20 ?15 ?10 ?5 0 5 v cc = 5v 10 15 20 25 ?15 ?10 ?5 0 5 10 z in = z out = 100 diff 15 20 25 rf power out (dbm) 643215 g18 rf power in (dbm) ?20 ?15 ?10 ?5 t case = 30c 0 5 10 15 20 110 120 130 140 150 100khz, p1db = 22.5dbm 160 170 180 190 total current i tot (ma) 643215 g21 z in = z out = 100 diff t case = 30c v cc = 5v z in = z out = 100 diff 1mhz, p1db = 22.5dbm case temperature (c) ?40 ?20 0 20 40 60 80 100 120 10mhz, p1db = 22.7dbm 130 140 150 160 170 180 190 200 total current i tot (ma) 643215 g22 50mhz, p1db = 22.9dbm supply voltage (v) 4.25 4.50 4.75 5 5.25 5.50 5.75 6 100 100mhz, p1db = 22.8dbm 110 120 130 140 150 160 170 180 total current i tot (ma) 643215 g20
9 for more information www.linear.com/LTC6432-15 pin functions dnc (pins 1, 2, 3, 4, 10, 11, 14, 16, 20, 21): do not connect. do not connect to these pins, allow them to float. failure to float these pins may impair the performance of the lt c6432-15. nfilt2 (pin 5) : a 1f capacitor to ground is required to reduce the low frequency noise of the internal bias supply. nfilt1 (pin 6) : a 1f capacitor to ground is required to reduce the low frequency noise of the internal bias supply. Cin (pin 7): negative signal input pin. this pin has an internally generated 2v dc bias. a dc blocking capaci - tor is required. see application information for specific recommendations. gnd (pins 8, 17, 23 exposed pad pin 25) : ground. for best rf performance, all ground pins should be connected to the printed circuit board ground plane. the exposed pad (pin 25) should have multiple via holes to an under - lying ground plane for low inductance and good thermal dissipation. v cc (pins 9, 22): positive power supply. either or both v cc pins should be connected to the 5v supply. pins 9 and 22 are internally connected on chip. bypass the v cc pin with 1000pf and 0.1f capacitors. the 1000pf capacitor should be physically close to the v cc pin. Cfdbk (pin 12): a 1f capacitor is required between this pin and Cout to extend the low frequency cutoff. Cout (pin 13): negative amplifier output pin. a trans - former with a center tap tied to v cc or a choke inductor is required to provide dc current and rf isolation. for best performance select a choke with low loss and high self resonant frequency (srf). see applications information section for more information. t_diode (pin 15): optional. a diode which can be forward biased to ground with up to 1ma of current. the measured voltage will be an indicator of the chip temperature. +out (pin 18): positive amplifier output pin. a transformer with a center tap tied to v cc or a choke inductor tied to 5v supply is required to provide dc current and rf isolation. for best performance select a choke with low loss and high self resonant frequency (srf). see applications information section for more information. +fdbk (pin 19): a 1f capacitor is required between this pin and +out to extend the low frequency cutoff. +in (pin 24): positive signal input pin. this pin has an internally generated 2v dc bias. a dc blocking capacitor is required. see application information section for specific recommendations. lt c6432 -15 643215f
10 for more information www.linear.com/LTC6432-15 test circuit a figure 1. differential application test circuit a (balanced amp) 643215 tc ?out ?in gnd gnd 1f LTC6432-15 v cc dnc dnc +fdbk v cc v cc = 5v dnc dnc ?fdbk dnc t_diode dnc dnc nfilt2 dnc dnc dnc gnd +out +in 1f nfilt1 1f input output x8r capacitors are recommended 1f 350 250 470h 280 240nh 1f 1f 1nf 1f 1:2 2:1 1f 350 1f 1f 1f 280 240nh 250 470h block diagram 643215 bd ?out 15db gain ?in gnd (8, 17, 23, exposed pad 25) v cc (9, 22) 13 t_diode 15 7 +out 15db gain +in 18 24 bias and temperature compensation lt c6432 -15 643215f
11 for more information www.linear.com/LTC6432-15 operation applications information the ltc6432 -15 is a highly linear, fixed gain differential amplifier. it can be considered a pair of 50 single-ended devices operating 180 degrees apart. its core signal path consists of a single amplifier stage minimizing stability issues. the input is a darlington pair for high input imped - ance and high current gain. additional circuit enhance - ments increase the output impedance commensurate with the input impedance and minimize the effects of internal miller capacitance. the lt c6432 -15 is a highly linear fixed gain amplifier designed for ease of use. both the input and output are matched to 100 differential source and load impedance from 100khz to 1000mhz using the specified evaluation circuit. biasing and temperature compensation are also handled internally to deliver optimized performance. the designer need only supply input/output blocking caps, rf chokes, feedback caps, filter caps and decoupling caps for the 5v supply. however, because the device is capable of such wide band operation, a single application circuit will probably not result in optimized performance across the full frequency band. differential circuits minimize the common mode noise and 2nd harmonic distortion issues that plague many designs. the ltc6432 s differential topology matches well with the differential inputs of an adc. however, evaluation of these differential circuits is difficult, as high resolution, high frequency, differential test equipment is lacking. our test circuit is designed for evaluation with standard single-ended 50 test equipment. therefore, 1:2 balun transformers have been added to the input and output to transform the LTC6432-15 s 100 differential source/load impedance to 50 single-ended impedance, compatible with most test equipment. other than the balun, the evaluation circuit requires a minimum of external components. input and output dc blocking caps are required as this device is internally biased the ltc6432 -15 uses a classic rf gain block topology, with enhancements to achieve excellent linearity. shunt and series feedback elements are added to simultane - ously lower the input/output impedance and match them to the 100 differential source and load. an internal bias controller optimizes the bias point for peak linearity over environmental changes. this circuit architecture provides low noise, good rf power handling capability and wide bandwidth; characteristics that are desirable for if signal chain applications. for optimal operation. a frequency appropriate choke and decoupling caps provide dc bias to the rf out nodes. only a single 5v supply is necessary to either of the v cc pins on the device. both v cc pins are connected inside the package. two v cc pins are provided for the conve - nience of supply routing on the pcb. an optional parallel 1f , 350 input network has been added to ensure low frequency stability. the particular element values shown in test circuit a are chosen for wide bandwidth operation. depending on the desired frequency, performance may be improved by proper selection of these supporting components. choosing the right rf choke not all choke inductors are created equal. it is always important to select an inductor with low r loss as this will drop the available voltage to the device. also look for an inductor with high self resonant frequency (srf) as this will limit the upper frequency where the choke is useful. above the srf, the parasitic capacitance dominates and the chokes impedance will drop. for these reasons, wire wound inductors are preferred, while multilayer ceramic chip inductors should be avoided for an rf choke if pos - sible. since the LTC6432-15 is capable of such wideband operation, a single choke value will not result in optimized per formance across its full frequency band. t able 1 list common frequency bands and suggested corresponding inductor values lt c6432 -15 643215f
12 for more information www.linear.com/LTC6432-15 applications information table 1. target frequency and suggested inductor values frequency band (mhz) inductor value (h) srf (mhz) model number manufacturer 0.1 to 20 470h 4 lps5030 coilcraft www.coilcraft.com 20 to 100 1500nh 100 0603ls 100 to 500 560nh 525 0603ls 500 to 1000 100nh 1150 0603ls designing a wideband output network often a single choke will not work over a wide bandwidth due to a low srf or low inductance value. using multiple choke stages, it is possible to extend the frequency range of the output network. this is best done using a circuit simulator and s parameters provided by the inductor manufacturer or measured by the user. please refer to the output network in figure 1 test circuit a. starting at out we connect two chokes in series, a 240nh rf choke and follow that with a 470h choke to provide high ac impedance at 100khz. it is important to place the lower valued (higher srf) choke closer to the signal line for best performance. de-qing resistors 250 and 280 respec - tively have been placed in parallel with the chokes. this flattens the loss of the output network and gives an overall flat gain response for the amplifier application cir cuit. with proper care selecting chokes, wideband per formance is possible. in this case circuit a works over 13 octaves. dc blocking capacitor the role of a dc blocking capacitor is straightforward : block the path of dc current and allow a low series imped - ance path for the ac signal. lower frequencies require a higher value of dc blocking capacitance. generally , 1f will suffice for operation down to 100khz. rf bypass capacitor rf bypass capacitors act to shunt the ac signals to ground with a low impedance path. they prevent the ac signal from getting into the dc bias supply. it is best to place the bypass capacitor as close as possible to the dc supply pins of the amplifier. any extra distance translates into additional series inductance which lowers the effec - tiveness of the bypass capacitor network. the suggested bypass capacitor network consists of two capacitors ; a low value 1000pf capacitor to shunt high frequencies and a larger 1f capacitor to handle lower frequencies. use ceramic capacitors of appropriate physical size for each capacitance value (e.g. 0402 for the 1000pf, 0805 for the 0.1f) to minimize the equivalent series resistance (esr) of the capacitor. high valued capacitors and linearity degradation one might not expect a passive element to create signal distortions. however, high value capacitors can create nonlinear responses at frequencies below 1mhz . typically lower quality materials are used to create high density capacitors. high quality npo and film capacitors have low capacitance density and become unmanageably large at 1f values. typical low quality capacitors have high volt - age coefficients that deviate from their expected linear response, creating im products and harmonics. w e have found that automotive grade x8r capacitors have reason - able voltage coefficients at high capacitance densities and will not degrade the linearity of the ltc6432 -15. we highly suggest their use in the 6 dc blocking capacitors and the 2 feedback capacitors shown in the application circuit. low frequency stability most rf gain blocks suffer from low frequency instability. to avoid stability issues, the LTC6432-15, contains an on- chip feedback network that lowers the gain and matches the input and output impedance of the intrinsic amplifier. this feedback network contains a series capacitor, whose value is limited by physical size. so at some low frequency, this feedback capacitor looks like an open circuit ; the feedback fails, gain increases and gross impedance mismatches occur which can create instability. this situation is easily resolved with a parallel capacitor and a resistor network on the input. this is shown in figure 1. this network provides resistive loss at low frequencies and is bypassed by the capacitor at the desired band of operation. however, if the LTC6432-15 is preceded by a low frequency termination such as a choke or balun transformer, the input stability network is not required. lt c6432 -15 643215f
13 for more information www.linear.com/LTC6432-15 applications information exposed pad and ground plane considerations as with any rf device, minimizing the ground inductance is critical. care should be taken with pc board layouts using exposed pad packages, as the exposed pad provides the lowest inductive path to ground. the maximum allowable number of minimum diameter via holes should be placed underneath the exposed pad and connect to as many ground plane layers as possible. this will provide good rf ground and low thermal impedance. maximizing the copper ground plane at the signal and microstrip ground will also improve the heat spreading and lower inductance. it is a good idea to cover the via holes with solder mask on the backside of the pcb to prevent the solder from wicking away from the critical pcb to exposed pad interface. one to two ounces of copper plating is suggested to improve heat spreading from the device. frequency limitations the ltc6432 -15 is a wide bandwidth amplifier but it is not intended for operation down to dc. the lower frequency cutoff is limited by on-chip matching elements. the cutoff may be arbitrarily pushed lower with off chip elements. however, the translation between the low fixed dc com - mon mode input voltage and the higher open collector dc common mode output bias point make dc-coupled operation impractical. t est circuit a t est circuit a shown in figure 1 is designed to allow for the evaluation of the LTC6432-15 with standard single-ended 50 test equipment. this allows the designer to verify the performance when the device is operated differentially. this evaluation circuit requires a minimum of external components. since the ltc6432 -15 operates over a very wide bandwidth, the evaluation test circuit is optimized for wideband operation. obviously, for narrowband operation, the circuit can be further optimized. input and output dc blocking capacitors are required, as this device is internally dc biased for optimal performance. a frequency appropriate choke and decoupling capacitors are required to provide dc bias to the rf output nodes (+out and Cout). a 5v supply should also be applied to one of the v cc pins on the device. two noise filter - ing capacitors should be tied to ground at nfilt1 and nfil t2 to suppress noise below 20mhz. in addition 1f capacitors should be tied between +fdbk and +out and between C fdbk and Cout to provide impedance match - ing below 20mhz. components for a suggested parallel 1f, 350 stability network have been added to ensure low frequency stabil - ity. the 1f capacitance can be increased to improve low frequency (<100khz ) performance, however the designer needs to be sure that the impedance presented at low frequency will not create an instability. as mentioned earlier, the LTC6432-15 is extremely wide - band. its bandwidth is most often limited by the passive components surrounding it. the dc2496 a evaluation board has provisions to allow characterization over the full bandwidth of the LTC6432-15 by substituting baluns and output networks. this balanced amplifier circuit is a replica of the test circuit a. it is useful for single-ended 50 amplifier requirements and is surprisingly wide band. using this balanced arrangement and the frequency appropriate baluns, one can achieve the intermodulation and harmonic performance listed in the ac electrical characteristics of this data sheet. besides its impressive intermodula - tion performance ; the LTC6432-15 has impressive 2nd harmonic suppression as well. this makes it particularly well suited for multi-octave applications where the 2nd harmonic cannot be filtered. this balanced circuit example uses two mini-circuits 1 :2 baluns. the baluns were chosen for their bandwidth and frequency options. see table 2. a pair of these baluns, back to back has less than 1.5db of loss, so the penalty for this level of performance is minimal. any 1 :2 balun may be used to create a balanced amplifier with the LTC6432-15, but one must be careful that the balun does not degrade the linearity of the circuit. the optional input stability network is only required when the baluns bandwidth reaches below 100khz. it is included in the circuit as a comprehensive protection for any passive element placed at the LTC6432-15 input. its performance degradation at low frequencies can be mitigated by increasing the 1f capacitors value. lt c6432 -15 643215f
14 for more information www.linear.com/LTC6432-15 applications information figure 2. dc2496a balanced amplifier circuit C 50 input and 50 output 5 5 4 4 3 3 2 2 1 1 d d c c b b a a 1. all resistors are in ohms, 0603 all capacitors are 0603. note: unless otherwise specified 2. all dnc pins on u1 are for linear use only ppt4 ppt5 t_diode ppt ppt1 ppt2 c10, c11 1uf, 0805 opt 100khz-20 mhz -a freq. 200-1000 mhz LTC6432-15 assy u1 adt2-1t+ t1, t2 -b adtl2-18+ * LTC6432-15 sytx2-6t-1+ opt 1-250 mhz LTC6432-15 -c t2 for assy- c t1 for assy-c vcc vcc vcc vcc vcc date: ic no. sheet of title: demo circuit schematic, approvals pcb des. app eng. fax: (408)434-0507 milpitas, ca 95035 phone: (408)432-1900 1630 mccarthy blvd. ltc confidential-for customer use only customer notice linear technology has made a best effort to design a circuit that meets customer-supplied specifications; however, it remains the customer's responsibility to verify proper and reliable operation in the actual application. component substitution and printed circuit board layout may significantly affect circuit performance or reliability. contact linear technology applications engineering for assistance. this circuit is proprietary to linear technology and supplied for use with linear technology parts. scale = none www.linear.com size: sku no. schematic no. and revision: pca bom: pca ass'y: 11 n/a ak john c. LTC6432-15 100khz to 1000mhz differential adc driver/amplifier dc2496a 700-dc2496a_rev02 710-dc2496a_rev 02 705-dc2496a_rev02 thursday, february 16, 2017 date: ic no. sheet of title: demo circuit schematic, approvals pcb des. app eng. fax: (408)434-0507 milpitas, ca 95035 phone: (408)432-1900 1630 mccarthy blvd. ltc confidential-for customer use only customer notice linear technology has made a best effort to design a circuit that meets customer-supplied specifications; however, it remains the customer's responsibility to verify proper and reliable operation in the actual application. component substitution and printed circuit board layout may significantly affect circuit performance or reliability. contact linear technology applications engineering for assistance. this circuit is proprietary to linear technology and supplied for use with linear technology parts. scale = none www.linear.com size: sku no. schematic no. and revision: pca bom: pca ass'y: 11 n/a ak john c. LTC6432-15 100khz to 1000mhz differential adc driver/amplifier dc2496a 700-dc2496a_rev02 710-dc2496a_rev 02 705-dc2496a_rev02 thursday, february 16, 2017 date: ic no. sheet of title: demo circuit schematic, approvals pcb des. app eng. fax: (408)434-0507 milpitas, ca 95035 phone: (408)432-1900 1630 mccarthy blvd. ltc confidential-for customer use only customer notice linear technology has made a best effort to design a circuit that meets customer-supplied specifications; however, it remains the customer's responsibility to verify proper and reliable operation in the actual application. component substitution and printed circuit board layout may significantly affect circuit performance or reliability. contact linear technology applications engineering for assistance. this circuit is proprietary to linear technology and supplied for use with linear technology parts. scale = none www.linear.com size: sku no. schematic no. and revision: pca bom: pca ass'y: 11 n/a ak john c. LTC6432-15 100khz to 1000mhz differential adc driver/amplifier dc2496a 700-dc2496a_rev02 710-dc2496a_rev 02 705-dc2496a_rev02 thursday, february 16, 2017 p20 r16 opt c3 0.1uf 0603 j4 out- c9 1uf 0805 z1 cmz5920b 1 2 r17 0 e4 t_diode adt2-1t+ 6 4 1 5 3 r14 348 0805 p1 l3 240nh r9 0603 280 p6 l2 240nh r11 opt c22 10uf 0805 adtl2-18 6 4 1 3 p10 c6 1uf 0805 r15 0 t2 sytx2-6t-1+ 6 4 1 3 2 5 7 8 c19 1000pf 0402 c21 1uf 0805 l1 470uh e2 vcc 4.75v-5.25v c11 * 0805 p4 r5 0603 280 l4 470uh c16 1uf 0805 r8 opt c20 0.1uf 0603 c7 1uf 0805 c5 10uf 0805 r18 0 u1 LTC6432-15 dnc 2 dnc 14 dnc 1 +in 24 dnc 4 nfilt1 6 gnd 8 dnc 10 dnc 21 +fdbk 19 gnd 17 vcc 22 dnc 20 +out 18 dnc 16 nfilt2 5 -in 7 vcc 9 dnc 11 t_diode 15 -fdbk 12 -out 13 dnc 3 gnd 23 gnd 25 c8 1uf 0805 r13 0603 249 c15 1uf 0805 p16 c1 1000pf 0402 c2 1000pf 0402 p2 p21 r1 0603 249 j1 +in c13 1uf 0805 c17 1uf 0805 r2 opt 0805 j3 -in r3 opt c4 1uf 0805 c12 1uf 0805 p11 r12 opt 0805 r10 opt 0805 p5 c14 1uf 0805 e3 gnd adtl2-18 6 4 1 3 r7 0 c18 1000pf 0402 c10 * 0805 j2 out+ adt2-1t+ 6 4 1 5 3 r6 opt 0805 r19 opt r4 348 0805 p3 t1 * sytx2-6t-1+ 6 4 1 3 2 5 7 8 lt c6432 -15 643215f
15 for more information www.linear.com/LTC6432-15 applications information figure 3. dc2496a topside no baluns installed figure 5. dc2496a topside with balun installed figure 4. dc2496a backside no baluns installed figure 6. dc2496a backside with baluns installed table 2. target frequency and suggested 2:1 balun frequency band (mhz) model number manuf acturer 0.1 to 20 sytx2-6t-1+ mini-circuits www.minicircuits.com 1 to 250 adt2- 1t+ 20 to 400 adt2-it-1p+ 200 to 950 adtl2-18+ the dc2496 a is designed for versatility to cover a wide range of applications. there are provisions for baluns on both the topside and backside of the dc2496a pcb. please see figures 3 through 6 for details. the smaller footprint adtx2-x baluns can be mounted on the front while the larger sytx2- 6t balun can be mounted on the back. table 2 lists the recommended balun for each frequency range. alternatively, the circuit can be operated differentially by using zero ohm jumpers across t3 and t4. the plots below show the resulting small signal performance for each balun choice. more detailed results and operation details can be found in the dc2496a quick start guide. the LTC6432-15 s differential output and high linearity make it the ideal solution to drive the demanding dif - ferential inputs of a high resolution adc. in figure 11 we show suggested circuit to drive an adc. both input and output are ac-coupled. a 1 :2 balun has been inserted at the input allowing a single-ended 50 input. the output impedance is 100 differential. however, a 1:1 balun has been added to the output to suppress common mode signals. this is followed by a low pass filter to limit the noise presented to the adc. lt c6432 -15 643215f
16 for more information www.linear.com/LTC6432-15 applications information figure 11 figure 7. dc2496a with sytx2 baluns figure 9. dc2496a with adt2-1t-1p baluns figure 8. dc2496a with adt2-1t baluns figure 10. dc2496a with adtl2-18 baluns 643215 f11 ?out ?in gnd gnd 1f LTC6432-15 v cc dnc dnc +fdbk v cc dnc dnc ?fdbk dnc t_diode dnc dnc nfilt2 dnc dnc dnc gnd +out +in 1f nfilt1 1f input 1f 350 100h 5v 1f 1f 1nf 1f 1:2 1:1 balun 1f 350 1f 1f 1f 100h ?in +in ?out +out lp filter ?in +in 16-bit adc + ? x8r capacitors are recommended lt c6432 -15 643215f ?30 ?20 ?10 0 10 20 magnitude (db), s parameters 643215 f07 s11 s21 recommended for 100khz to 20mhz s22 recommended for 20mhz to 400mhz frequency (hz) 100k 1m 10m 100m 1g ?30 ?20 frequency (hz) ?10 0 10 20 magnitude (db), s parameters 643215 f09 s11 s21 s22 recommended for 1mhz to 250mhz 100k frequency (hz) 100k 1m 10m 100m 1g ?40 ?30 ?20 ?10 1m 0 10 20 magnitude (db), s parameters 643215 f08 s11 s21 s22 recommended for 200mhz to 950mhz frequency (hz) 10m 100k 1m 10m 100m 1g ?30 ?20 ?10 0 10 100m 20 magnitude (db), s parameters 643215 f10 s11 s21 s22 1g ?40
17 for more information www.linear.com/LTC6432-15 differential s parameters 5v, z diff = 100, t case = 30c, de-embedded to package pins, 1f capacitor +fdbk to out + and 1f capacitor Cfdbk to out C dd: differential in to differential out. frequency (hz) s11 dd (mag) s11 dd (ph) s21 dd (mag) s21 dd (ph) s12 dd (mag) s12 dd (ph) s22 dd (mag) s22 dd (ph) gtu (max) stabilit y (k) 1.00e+05 C24.65 213.98 16.01 181.44 C18.97 1.08 C33.32 108.18 16.03 1.05 1.16e+05 C24.79 207.23 16.02 181.17 C18.89 1.05 C33.33 111.81 16.04 1.05 1.32e+05 C25.2 204.3 16.01 180.97 C18.89 1.53 C35.44 114.82 16.03 1.05 1.53e+05 C25.39 202.21 16.02 180.79 C18.74 1.31 C35.78 107.24 16.03 1.05 1.75e+05 C25.57 196.89 16 180.63 C18.97 2.09 C35.36 105.24 16.02 1.06 2.00e+05 C25.79 195.49 16.01 180.6 C18.86 1.12 C36.06 105.2 16.02 1.05 2.31e+05 C26.17 190.78 16 180.36 C18.92 1.28 C39.79 108.96 16.01 1.05 2.62e+05 C25.82 190.86 16 180.36 C18.94 0.73 C39.71 110.15 16.01 1.06 3.05e+05 C25.98 190.11 16.01 180.23 C18.85 0.79 C38.61 109.37 16.02 1.05 3.47e+05 C26.23 190.65 15.99 180.21 C18.98 0.85 C40.21 103.4 16 1.06 4.01e+05 C26.45 185.6 16 180.09 C18.84 0.86 C42.42 119.95 16.01 1.05 4.59e+05 C26.45 188.23 16 179.95 C18.91 0.84 C39.93 116.1 16.01 1.05 5.25e+05 C26.58 185.06 15.98 179.99 C18.79 C0.13 C41.67 99.54 15.99 1.05 6.06e+05 C26.29 183.94 15.98 179.93 C18.77 0.66 C46.44 115.06 15.99 1.05 6.88e+05 C26.23 181.89 15.98 179.89 C18.91 0.03 C42.61 121.63 15.99 1.06 7.99e+05 C26.37 181.41 15.98 179.92 C18.98 0.55 C43.66 121.57 15.99 1.06 9.10e+05 C26.08 180.72 15.97 179.86 C18.92 0.1 C43.9 107.29 15.98 1.06 1.05e+06 C26.42 180.43 15.96 179.75 C18.81 0.74 C44.98 111.22 15.97 1.05 1.20e+06 C26.64 182.6 15.96 179.82 C18.87 1.49 C48.41 89.98 15.97 1.06 1.38e+06 C26.64 179.74 15.96 179.8 C18.92 0.32 C45.69 70.77 15.97 1.06 1.59e+06 C26.27 180.38 15.96 179.62 C18.99 0.92 C46.98 70.78 15.97 1.06 1.80e+06 C26.84 178.66 15.94 179.67 C18.81 0.58 C46.36 39.09 15.95 1.05 2.10e+06 C27.03 179.86 15.94 179.66 C18.83 C0.31 C47.02 79.31 15.95 1.05 2.39e+06 C26.96 179.61 15.95 179.56 C18.68 0.06 C48.54 104.5 15.96 1.05 2.76e+06 C26.59 176.02 15.93 179.6 C18.82 C0.07 C45.61 39.58 15.94 1.05 3.16e+06 C27.18 175.48 15.95 179.52 C18.82 0.47 C 50.75 6.16 15.95 1.05 3.62e+06 C27.27 176.96 15.93 179.52 C18.88 C1.04 C51.57 45.5 15.94 1.06 4.17e+06 C27.17 180.85 15.92 179.31 C18.78 C0.91 C47.24 56.08 15.93 1.05 4.73e+06 C27.01 177.52 15.93 179.38 C18.85 0.12 C51.03 C31.55 15.93 1.06 5.50e+06 C27.27 176.8 15.91 179.34 C18.87 0.02 C55.12 2.13 15.92 1.06 6.26e+06 C27.18 178.74 15.92 179.25 C18.75 C0.77 C63.87 C30.58 15.93 1.05 7.23e+06 C26.73 178.6 15.92 179.23 C18.89 C1.44 C50.17 C9.92 15.92 1.06 8.29e+06 C27.28 178.11 15.91 179.03 C18.78 C0.48 C51.41 12.11 15.92 1.05 9.48e+06 C27.26 179.63 15.92 179.01 C18.88 C0.56 C52.35 C41.82 15.93 1.06 1.09e+07 C27.26 179.73 15.91 178.89 C18.86 C0.95 C49.86 C24.68 15.92 1.06 1.24e+07 C27.21 180.03 15.92 178.77 C18.88 C1 C50.43 C51.11 15.92 1.06 1.44e+07 C27.13 181.01 15.91 178.58 C18.88 C1.13 C48.02 C52.74 15.92 1.06 1.64e+07 C27.37 179.77 15.91 178.43 C18.87 C1.23 C45.4 C49.5 15.92 1.06 1.90e+07 C27.4 180.64 15.91 178.21 C18.87 C1.36 C44.79 C59.22 15.91 1.06 lt c6432 -15 643215f
18 for more information www.linear.com/LTC6432-15 differential s parameters 5v, z diff = 100, t case = 30c, de-embedded to package pins, 1f capacitor +fdbk to out + and 1f capacitor Cfdbk to out C dd: differential in to differential out. frequency (mhz) s11 dd (mag) s11 dd (ph) s21 dd (mag) s21 dd (ph) s12 dd (mag) s12 dd (ph) s22 dd (mag) s22 dd (ph) gtu (max) stabilit y (k) 2.17e+07 C27.32 181.3 15.9 177.93 C18.88 C1.67 C42.22 C52.54 15.91 1.06 2.49e+07 C27.12 181.43 15.9 177.69 C18.85 C1.99 C41.72 C64.62 15.91 1.06 2.87e+07 C26.96 181.05 15.9 177.36 C18.86 C2.43 C40.84 C61.81 15.91 1.06 3.26e+07 C27.24 182.44 15.89 177.04 C18.86 C2.53 C39.61 C70.18 15.9 1.06 3.78e+07 C26.86 183.1 15.89 176.6 C18.89 C3.1 C38.18 C68.88 15.9 1.06 4.31e+07 C26.76 182.65 15.9 176.13 C18.86 C3.54 C37.65 C74.32 15.91 1.06 4.98e+07 C26.62 181.26 15.89 175.61 C18.91 C3.78 C35.95 C76.76 15.9 1.06 5.70e+07 C26.75 181.06 15.89 175 C18.91 C4.63 C34.6 C83.01 15.9 1.06 6.52e+07 C26.95 182.92 15.9 174.31 C18.9 C5.13 C33.59 C87.34 15.91 1.06 7.53e+07 C26.88 179.75 15.9 173.46 C18.92 C6.03 C32.99 C86.88 15.91 1.06 8.54e+07 C26.47 180.29 15.9 172.59 C18.95 C6.61 C31.62 C89.71 15.91 1.06 9.92e+07 C26.82 179.69 15.91 171.39 C18.92 C7.57 C30.3 C97.21 15.92 1.06 1.13e+08 C26.63 178.99 15.92 170.17 C18.95 C8.7 C29.22 C95.47 15.93 1.06 1.31e+08 C26.88 176.87 15.92 168.6 C18.96 C9.88 C28.31 C100.54 15.94 1.06 1.50e+08 C26.83 177.15 15.94 166.88 C18.96 C11.16 C27.4 C104.6 15.95 1.06 1.71e+08 C27 176.62 15.95 164.91 C18.96 C13.01 C26.82 C107.66 15.97 1.06 1.97e+08 C27.59 176.01 15.96 162.38 C18.96 C14.59 C26.14 C110.04 15.97 1.06 2.24e+08 C27.5 179.18 15.96 159.78 C18.94 C16.96 C25.69 C111.52 15.98 1.05 2.60e+08 C27.45 180.64 15.93 156.29 C18.97 C19.81 C25.41 C112.18 15.95 1.06 2.96e+08 C27.43 181.86 15.88 152.81 C18.97 C22.79 C24.98 C108.99 15.9 1.06 3.42e+08 C27 182.3 15.8 148.49 C19 C26.46 C24.35 C103.45 15.82 1.06 3.92e+08 C26.74 180.54 15.7 144 C19.06 C30.32 C22.82 C96.37 15.73 1.07 4.49e+08 C26.64 178.86 15.59 139.1 C19.17 C 34.98 C 20.83 C92.76 15.64 1.07 5.18e+08 C27.17 178.07 15.46 133.25 C19.27 C39.99 C18.56 C92.28 15.53 1.08 5.88e+08 C27.89 179.84 15.37 127.38 C19.43 C45.32 C16.49 C94.9 15.48 1.09 6.82e+08 C28.41 192.17 15.23 119.35 C19.65 C52.66 C14.25 C100.15 15.4 1.09 7.77e+08 C27.7 208.65 15.07 111.07 C19.84 C59.66 C12.39 C106.24 15.34 1.09 8.98e+08 C24.34 220.03 14.89 100.45 C20.16 C68.72 C10.43 C114.78 15.32 1.09 1.03e+09 C20.91 217.95 14.59 89.13 C20.53 C78.35 C8.69 C124.05 15.25 1.07 1.18e+09 C17.61 208.58 14.14 75.71 C21.11 C89.5 C7.1 C134.83 15.16 1.05 1.36e+09 C14.62 192.85 13.4 59.47 C21.9 C103.24 C5.56 C148.41 14.96 1.02 1.54e+09 C12.38 175.97 12.41 45.07 C22.92 C115.67 C4.41 C161.86 14.63 1.01 1.79e+09 C10.26 150.16 11.29 29.07 C24.47 C130.06 C3.34 179.45 14.42 1.01 2.04e+09 C8.89 126.71 10.6 12.81 C25.73 C143.95 C2.83 161.69 14.4 1.02 2.36e+09 C7.68 98.74 9.25 354.9 C27.3 C157.95 C2.67 139.37 13.44 1.28 2.70e+09 C6.66 71.35 8.02 336.79 C29.27 C174.25 C2.8 116.2 12.31 1.86 3.09e+09 C5.78 43.7 7.98 310.66 C30.89 166.1 C3.19 92.85 12.16 2.35 3.56e+09 C5.28 15 5.73 281.01 C34.09 137.29 C3.99 66.89 9.47 5.21 lt c6432 -15 643215f
19 for more information www.linear.com/LTC6432-15 information furnished by linear technology corporation is believed to be accurate and reliable. however, no responsibility is assumed for its use. linear technology corporation makes no representa - tion that the interconnection of its circuits as described herein will not infringe on existing patent rights. package description please refer to http://www.linear.com/product/LTC6432-15#packaging for the most recent package drawings. 4.00 0.10 (4 sides) note: 1. drawing proposed to be made a jedec package outline mo-220 variation (wggd-x)?to be approved 2. drawing not to scale 3. all dimensions are in millimeters 4. dimensions of exposed pad on bottom of package do not include mold flash. mold flash, if present, shall not exceed 0.15mm on any side, if present 5. exposed pad shall be solder plated 6. shaded area is only a reference for pin 1 location on the top and bottom of package pin 1 top mark (note 6) 0.40 0.10 2423 1 2 bottom view?exposed pad 2.45 0.10 (4-sides) 0.75 0.05 r = 0.115 typ 0.25 0.05 0.50 bsc 0.200 ref 0.00 ? 0.05 (uf24) qfn 0105 rev b recommended solder pad pitch and dimensions 0.70 0.05 0.25 0.05 0.50 bsc 2.45 0.05 (4 sides) 3.10 0.05 4.50 0.05 package outline pin 1 notch r = 0.20 typ or 0.35 45 chamfer uf package 24-lead plastic qfn (4mm 4mm) (reference ltc dwg # 05-08-1697 rev b) lt c6432 -15 643215f
20 for more information www.linear.com/LTC6432-15 ? linear technology corporation 2017 lt 0417 ? printed in usa www.linear.com/LTC6432-15 part number description comments fixed gain if amplifiers/adc drivers ltc6430-20 100 differential 20db gain block if amplifier 20mhz to 2ghz 2.9db nf 20.8db gain, 51dbm oip3 at 240mhz into a 100 differential load ltc6431-20 50 20db gain block if amplifier single-ended version of ltc6430-20, 20.8db gain, 46.2dbm oip3 at 240mhz into a 50 load ltc6431-15 50 15db gain block if amplifier single-ended version of ltc6430-15, 15.5db gain, 47dbm oip3 at 240mhz into a 50 load ltc6430-15 100 differential 15db gain block if amplifier 20mhz to 2ghz 3.3db nf 15.5db gain, 50dbm oip3 at 240mhz into a 100 differential load ltc6417 1.6ghz low noise high linearity differential buffer/adc driver oip3 = 41dbm at 300mhz, can drive 50 differential output high speed voltage clamping protects subsequent circuitry ltc6400-8/ltc6400-14/ ltc6400-20/ltc6400-26 1.8ghz low noise, low distortion differential adc drivers C71dbc im3 at 240mhz 2v p-p composite, i s = 90ma, a v = 8db, 14db, 20db, 26db ltc6401-8/ltc6401-14/ ltc6401-20/ltc6401-26 1.3ghz low noise, low distortion differential adc drivers C74dbc im3 at 140mhz 2v p-p composite, i s = 50ma, a v = 8db, 14db, 20db, 26db ltc6433-15 50, 15db low frequency gain block oip3 = 52dbm at 1mhz, single-ended version of LTC6432-15 variable gain if amplifiers/adc drivers ltc6412 800mhz, 31db range analog-controlled vga oip3 = 35dbm at 240mhz, continuously adjustable gain control baseband differential amplifiers ltc6409 1.1nv/hz single supply differential amplifier/adc driver 88db sfdr at 100mhz, ac- or dc-coupled inputs ltc6419 3ghz rail-to-rail input differential amplifier/ adc driver C65dbc im3 at 50mhz 2v p-p composite, rail-to-rail inputs, en = 1.6nv/hz, 18ma high speed adcs lt c2208/ltc2209 16-bit, 13msps/160msps adc 74dbfs noise floor , sfdr > 89db at 140mhz, 2.25v p-p input ltc2259-16 16-bit, 80msps adc, ultralow power 72dbfs noise floor, sfdr > 82db at 140mhz, 2.00v p-p input ltc2160/ ltc2161 16-bit, 25msps/40msps/60msps adc low power 76.2 dbfs noise floor, sfdr > 84db at 140mhz, 2.00v p-p input ltc2155-14/ltc2156-14/ ltc2157-14/ltc2158-14 14-bit, 170msps/210msps/250msps/310msps adc 2-channel 69dbfs noise floor, sfdr > 80db at 140mhz, 1.50v p-p input, >1ghz input bw ltc2216 16-bit, 80msps adc 79dbfs noise floor, sfdr > 91db at 140mhz, 75v p-p input related parts typical application 643215 ta02 ?out ?in gnd gnd 1f LTC6432-15 v cc dnc dnc +fdbk v cc dnc dnc ?fdbk dnc t_diode dnc dnc nfilt2 dnc dnc dnc gnd +out +in 1f nfilt1 1f input 1f 350 100h 5v 1f 1f 1nf 1f 1:2 1:1 balun 1f 350 1f 1f 1f 100h ?in +in ?out +out lp filter ?in +in 16-bit adc + ? x8r capacitors are recommended lt c6432 -15 643215f

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