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lt 6375 1 6375fa for more information www.linear.com/lt6375 typical application features description 270 v common mode voltage difference amplifier the lt ? 6375 is a unity-gain difference amplifier which combines excellent dc precision, a very high input common mode range and a wide supply voltage range. it includes a precision op amp and a highly-matched thin film resistor network. it features excellent cmrr, extremely low gain error and extremely low gain drift. comparing the lt6375 to existing difference amplifiers with high common mode voltage range, the selectable resistor divider ratios of the lt6375 offer superior system performance by allowing the user to achieve maximum snr, precision and speed for a specific input common mode voltage range. the op amp at the core of the lt6375 has over-the- top ? protected inputs which allow for robust operation in envi- ronments with unpredictable voltage conditions. see the applications information section for more details. the lt6375 is specified over the C40 c to 125 c tem- perature range and is available in space-saving msop16 and dfn14 packages. precision wide voltage range, bidirectional current monitor applications n high side or low side current sensing n bidirectional wide common mode range current sensing n high voltage to low voltage level translation n precision difference ampliier n industrial data-acquisition front-ends n replacement for isolation circuits l , lt , lt c , lt m , linear technology, over-the- top and the linear logo are registered trademarks of linear technology corporation. all other trademarks are the property of their respective owners. n 270v common mode voltage range n 97db minimum cmrr (lt6375a) n 0.0035% (35ppm) maximum gain error (lt6375a) n 1ppm/c maximum gain error drift n 2ppm maximum gain nonlinearity n wide supply voltage range: 3.3v to 50v n rail-to-rail output n 350a supply current n selectable internal resistor divider ratio n 300v maximum offset voltage (lt6375a) n 575khz C3db bandwidth (resistor divider = 7) n 375khz C3db bandwidth (resistor divider = 20) n C40c to 125c speciied temperature range n low power shutdown: 20a (dfn package only) n space-saving msop and dfn packages cmrr (v/v = ppm) C40 C30 C20 C10 0 10 20 30 40 0 20 40 60 80 100 120 140 160 180 200 number of units 6375 ta01b 1248 units from 4 runs v s = 15v v in = 270v div = 25 typical distribution of cmrr C + v + v C C15v v source + = C270v to 270v 15v out v out = 10mv/ma ref Crefa Cin+in Crefb 19k 38k 190k 190k 190k 23.75k Crefc +refa +refb +refc 6375 ta01a 19k 38k shdn 23.75k r c 10? r sense 10? 190k load downloaded from: http:///
lt 6375 2 6375fa for more information www.linear.com/lt6375 pin configuration absolute maximum ratings supply voltages ( v + to v C ) .............................................................. 60 v + in , C in , ( note 2) each input ......................................................... 270 v differential ........................................................ 540 v + refa , C refa , + refb , C refb , + refc , C refc , ref , shdn ( note 2) ................ (v + + 0.3 v) to (v C C0.3 v) output current ( continuous ) ( note 6) .................... 50 ma 1 3 4 5 6 7 +in +refa+refb +refc ref shdn Cin CrefaCrefb Crefc v + out 15 v C 14 12 11 10 9 8 top view df package 14(12)-lead (4mm 4mm) plastic dfn t jmax = 150c, ja = 43c/w, jc = 4c/w exposed pad (pin 15) is v C , must be soldered to pcb 13 5 6 7 8 +in +refa +refb+refc ref v ? 1614 12 11 10 9 ?in ?refa ?refb ?refc v + out top view ms package variation: ms16 (12) 16-lead plastic msop t jmax = 150c, ja = 130c/w order information lead free finish tape and reel part marking* package description temperature range lt6375idf#pbf lt6375idf#trpbf 6375 14-lead (4mm 4mm) plastic dfn C40c to 85c lt6375hdf#pbf lt6375hdf#trpbf 6375 14-lead (4mm 4mm) plastic dfn C40c to 125c lt6375ahdf#pbf lt6375ahdf#trpbf 6375 14-lead (4mm 4mm) plastic dfn C40c to 125c lt6375ims#pbf lt6375ims#trpbf 6375 16-lead plastic msop C40c to 85c lt6375hms#pbf lt6375hms#trpbf 6375 16-lead plastic msop C40c to 125c lt6375ahms#pbf lt6375ahms#trpbf 6375 16-lead plastic msop C40c to 125c consult lt c 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. output short - circuit duration ( note 3) thermally limited temperature ran ge ( notes 4, 5) lt 6375 i................................................ C40 c to 85 c lt 6375 h ............................................ C40 c to 125 c storage temperature range .................. C65 c to 150 c msop lead temperature ( soldering , 10 sec ) ........ 300 c (note 1) downloaded from: http:///
lt 6375 3 6375fa for more information www.linear.com/lt6375 electrical characteristics the l denotes the specifications which apply over the full operating temperature range , C40 c < t a < 85 c for i- grade parts , C40 c < t a < 125 c for h- grade parts, otherwise specifications are at t a = 25 c, v + = 15v, v C = C15v, v cm = v out = v ref = 0v. v cmop is the common mode voltage of the internal op amp. for resistor divider ratio?=?7, refa = refc = open, refb = 0v. for resistor divider ratio = 20, refa = refc = 0v, refb = open. for resistor divider ratio = 25, refa = refb = refc = 0v. symbol parameter conditions lt6375a lt6375 units min typ max min typ max g gain v out = 10v 1 1 v/v ?g gain error v out = 10v l 0.0007 0.0035 0.005 0.001 0.006 0.0075 % % ?g/?t gain drift vs temperature (note 6) v out = 10v l 0.2 1 0.2 1 ppm/ c gnl gain nonlinearity v out = 10v l 1 2 3 1 2 3 ppm ppm v os output offset voltage v C < v cmop < v + C1.75v resistor divider ratio = 7 resistor divider ratio = 7 resistor divider ratio = 20 resistor divider ratio = 20 resistor divider ratio = 25 resistor divider ratio = 25 l l l 100 250 300 300 750 700 2000 900 2500 120 300 400 450 1500 1200 4000 1500 5000 v v v v v v ? v os /?t output offset voltage drift (note 6) v C < v cmop < v + C1.75v resistor divider ratio = 7 resistor divider ratio = 20 ll 3 8 9 23 4 10 12 30 v/c v/c r in input impedance (note 8) common mode resistor divider ratio = 7 resistor divider ratio = 20 resistor divider ratio = 25 differential l l l l 93 84 83 320 111 100 99 380 129 116 115 440 93 84 83 320 111 100 99 380 129 116 115 440 k k k k cmrr common mode rejection ratio ms16 package resistor divider ratio = 7, v cm = 28v resistor divider ratio = 7, v cm = 28v resistor divider ratio = 20, v cm = 28v resistor divider ratio = 20, v cm = 28v resistor divider ratio = 25, v cm = 28v resistor divider ratio = 25, v cm = 28v resistor divider ratio = 25, v cm = 270v resistor divider ratio = 25, v cm = 270v l l l l 96 94 96 94 96 94 97 94 106 106 106 107 89 83 89 83 89 83 90 83 100 100 100 100 db db db db db db db db df 14 package resistor divider ratio = 7, v cm = 28v resistor divider ratio = 7, v cm = 28v resistor divider ratio = 20, v cm = 28v resistor divider ratio = 20, v cm = 28v resistor divider ratio = 25, v cm = 28v resistor divider ratio = 25, v cm = 28v resistor divider ratio = 25, v cm = 270v resistor divider ratio = 25, v cm = 270v l l l l 94 92 94 92 94 92 95 92 104 104 104 105 89 83 89 83 89 83 90 83 100 100 100 100 db db db db db db db db v cm input voltage range (note 7) l C270 270 C270 270 v psrr power supply rejection ratio v s = 1.65v to 25v, v cm = v out = mid-supply resistor divider ratio = 7 resistor divider ratio = 20 resistor divider ratio = 25 l l l 101 93 91 115 104 101 98 90 88 110 100 100 db db db downloaded from: http:///
lt 6375 4 6375fa for more information www.linear.com/lt6375 electrical characteristics the l denotes the specifications which apply over the full operating temperature range , C40 c < t a < 85 c for i- grade parts , C40 c < t a < 125 c for h- grade parts, otherwise specifications are at t a = 25 c, v + = 15v, v C = C15v, v cm = v out = v ref = 0v. v cmop is the common mode voltage of the internal op amp. for resistor divider ratio?=?7, refa = refc = open, refb = 0v. for resistor divider ratio = 20, refa = refc = 0v, refb = open. for resistor divider ratio = 25, refa = refb = refc = 0v. symbol parameter conditions lt6375a lt6375 units min typ max min typ max e no output referred noise voltage density f = 1khz resistor divider ratio = 7 resistor divider ratio = 20 resistor divider ratio = 25 250 508 599 250 508 599 nv/ hz nv/ hz nv/ hz output referred noise voltage f = 0.1hz to 10hz resistor divider ratio = 7 resistor divider ratio = 20 resistor divider ratio = 25 10 20 25 10 20 25 v p-p v p-p v p-p v ol output voltage swing low (referred to v C ) no load i sink = 5ma l l 5 280 50 500 5 280 50 500 mv mv v oh output voltage swing high (referred to v + ) no load i source = 5ma l l 5 400 20 750 5 400 20 750 mv mv i sc short-circuit output current 50 to v + 50 to v C l l 10 10 28 30 10 10 28 30 ma ma sr slew rate ?v out = 5v l 1.6 2.4 1.6 2.4 v/s bw small signal C3db bandwidth resistor divider ratio = 7 resistor divider ratio = 20 resistor divider ratio = 25 575 375 310 575 375 310 khz khz khz t s settling time resistor divider ratio = 7 0.01%, ?v out = 10v 0.1%, ?v out = 10v 0.01%, ?v cm = 10v, ?v diff = 0v 41 14 100 41 14 100 s s s resistor divider ratio = 20 0.01%, ?v out = 10v 0.1%, ?v out = 10v 0.01%, ?v cm = 10v, ?v diff = 0v 31 11 100 31 11 100 s s s resistor divider ratio = 25 0.01%, ?v out = 10v 0.1%, ?v out = 10v 0.01%, ?v cm = 10v, ?v diff = 0v 26 8 20 26 8 20 s s s v s supply voltage l 3 3.3 50 50 3 3.3 50 50 v v t on turn-on time 16 16 s v il shdn input logic low (referred to v + ) l C2.5 C2.5 v v ih shdn input logic high (referred to v + ) l C1.2 C1.2 v i shdn shdn pin current l C10 C15 C10 C15 a i s supply current active, v shdn v + C1.2v active, v shdn v + C1.2v shutdown, v shdn v + C2.5v shutdown, v shdn v + C2.5v l l 350 20 400 600 25 70 350 20 400 600 25 70 a a a a downloaded from: http:///
lt 6375 5 6375fa for more information www.linear.com/lt6375 electrical characteristics the l denotes the specifications which apply over the full operating temperature range , C40 c < t a < 85 c for i- grade parts , C40 c < t a < 125 c for h- grade parts, otherwise specifications are at t a = 25 c, v + = 5v, v C = 0v, v cm = v out = v ref = mid-supply. v cmop is the common mode voltage of the internal op amp. for resistor divider ratio = 7, refa = refc = open, refb = mid-supply. for resistor divider ratio = 20, refa = refc = mid-supply, refb?=?open. for resistor divider ratio = 25, refa = refb = refc = mid-supply. symbol parameter conditions lt6375a lt6375 units min typ max min typ max g gain v out = 1v to 4v 1 1 v/v ?g gain error v out = 1v to 4v l 0.0007 0.0035 0.005 0.001 0.006 0.0075 % % ?g/?t gain drift vs temperature (note 6) v out = 1v to 4v l 0.2 1 0.2 1 ppm/ c gnl gain nonlinearity v out = 1v to 4v 1 1 ppm v os output offset voltage 0 < v cmop < v + C1.75v resistor divider ratio = 7 resistor divider ratio = 7 resistor divider ratio = 20 resistor divider ratio = 20 resistor divider ratio = 25 resistor divider ratio = 25 l l l 100 250 300 300 750 700 2000 900 2500 120 300 400 500 1500 1200 4000 1500 5000 v v v v v v ? v os /?t output offset voltage drift (note 6) 0 < v cmop < v + C1.75v resistor divider ratio = 7 resistor divider ratio = 20 l l 3 8 9 23 4 10 12 30 v/c v/c r in input impedance (note 8) common mode resistor divider ratio = 7 resistor divider ratio = 20 resistor divider ratio = 25 differential l l l l 93 84 83 320 111 100 99 380 129 116 115 440 93 84 83 320 111 100 99 380 129 116 115 440 k k k k cmrr common mode rejection ratio ms16 package resistor divider ratio = 7 v cm = C15v to +7.75v v cm = C15v to +7.75v resistor divider ratio = 20 v cm = C25.5v to +17.5v v cm = C25.5v to +17.5v resistor divider ratio = 25 v cm = C25.5v to +21.25v v cm = C25.5v to +21.25v l l l 94 92 94 92 94 92 105 105 105 85 83 85 83 85 83 95 95 95 db db db db db db df 14 package resistor divider ratio = 7 v cm = C15v to +7.75v v cm = C15v to +7.75v resistor divider ratio = 20 v cm = C25.5v to +17.5v v cm = C25.5v to +17.5v resistor divider ratio = 25 v cm = C25.5v to +21.25v v cm = C25.5v to +21.25v l l l 92 90 92 90 92 90 103 103 103 85 83 85 83 85 83 95 95 95 db db db db db db psrr power supply rejection ratio v s = 1.65v to 25v, v cm = v out = mid-supply resistor divider ratio = 7 resistor divider ratio = 20 resistor divider ratio = 25 l l l 101 93 91 115 104 101 98 90 88 110 100 100 db db db e no output referred noise voltage density f = 1khz resistor divider ratio = 7 resistor divider ratio = 20 resistor divider ratio = 25 250 508 599 250 508 599 nv/ hz nv/ hz nv/ hz downloaded from: http:///
lt 6375 6 6375fa for more information www.linear.com/lt6375 electrical characteristics the l denotes the specifications which apply over the full operating temperature range , C40 c < t a < 85 c for i- grade parts , C40 c < t a < 125 c for h- grade parts, otherwise specifications are at t a = 25 c, v + = 5v, v C = 0v, v cm = v out = v ref = mid-supply. v cmop is the common mode voltage of the internal op amp. for resistor divider ratio = 7, refa = refc = open, refb = mid-supply. for resistor divider ratio = 20, refa = refc = mid-supply, refb?=?open. for resistor divider ratio = 25, refa = refb = refc = mid-supply. symbol parameter conditions lt6375a lt6375 units min typ max min typ max output referred noise voltage f = 0.1hz to 10hz resistor divider ratio = 7 resistor divider ratio = 20 resistor divider ratio = 25 10 20 25 10 20 25 v p-p v p-p v p-p v ol output voltage swing low (referred to v C ) no load i sink = 5ma l l 5 280 50 500 5 280 50 500 mv mv v oh output voltage swing high (referred to v + ) no load i source = 5ma l l 5 400 20 750 5 400 20 750 mv mv i sc short-circuit output current 50 to v + 50 to v C l l 10 10 27 25 10 10 27 25 ma ma sr slew rate ?v out = 3v l 1.3 2 1.3 2 v/s bw small signal C3db bandwidth resistor divider ratio = 7 resistor divider ratio = 20 resistor divider ratio = 25 565 380 325 565 380 325 khz khz khz t s settling time resistor divider ratio = 7 0.01%, ?v out = 2v 0.1%, ?v out = 2v 0.01%, ?v cm = 2v, ?v diff = 0v 18 10 64 18 10 64 s s s resistor divider ratio = 20 0.01%, ?v out = 2v 0.1%, ?v out = 2v 0.01%, ?v cm = 2v, ?v diff = 0v 24 7 48 24 7 48 s s s resistor divider ratio = 25 0.01%, ?v out = 2v 0.1%, ?v out = 2v 0.01%, ?v cm = 2v, ?v diff = 0v 27 9 20 27 9 20 s s s v s supply voltage l 3 3.3 50 50 3 3.3 50 50 v v t on turn-on time 22 22 s v il shdn input logic low (referred to v + ) l C2.5 C2.5 v v ih shdn input logic high (referred to v + ) l C1.2 C1.2 v i shdn shdn pin current l C10 C15 C10 C15 a i s supply current active, v shdn v + C1.2v active, v shdn v + C1.2v shutdown, v shdn v + C2.5v shutdown, v shdn v + C2.5v l l 330 15 370 525 20 40 330 15 370 525 20 40 a a a a downloaded from: http:///
lt 6375 7 6375fa for more information www.linear.com/lt6375 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: see common mode voltage range in the applications information section of this data sheet for other considerations when taking +in/Cin pins to 270v. all other pins should not be taken more than 0.3v beyond the supply rails. note 3: a heat sink may be required to keep the junction temperature below absolute maximum. this depends on the power supply, input voltages and the output current. note 4: the lt6375i is guaranteed functional over the operating temperature range of C40c to 85c. the lt6375h is guaranteed functional over the operating temperature range of C40c to 125c. note 5: the lt6375i is guaranteed to meet specified performance from C40c to 85c. the lt6375h is guaranteed to meet specified performance from C40c to 125c. note 6: this parameter is not 100% tested. note 7: input voltage range is guaranteed by the cmrr test at v s = 15v and all ref pins at ground (resistor divider ratio = 25). for the other voltages, this parameter is guaranteed by design and through correlation with the 15v test. see common mode voltage range in the applications information section to determine the valid input voltage range under various operating conditions. note 8: input impedance is tested by a combination of direct measurement and correlation to the cmrr and gain error tests. typical performance characteristics typical distribution of gain error typical distribution of gain error typical distribution of gain error typical distribution of cmrr typical distribution of cmrr typical distribution of cmrr cmrr (v/v = ppm) C40 C30 C20 C10 0 10 20 30 40 0 20 40 60 80 100 120 140 160 180 200 number of units 6375 g01 1248 units from 4 runs both packages v s = 15v v in = 270v div = 25 655 units from 2 runs ms16(12) cmrr (v/v = ppm) C40 C30 C20 C10 0 10 20 30 40 0 10 20 30 40 50 60 70 80 90 100 number of units 6375 g02 v s = 15v v in = 270v div = 25 593 units from 2 runs df14(12) cmrr (v/v = ppm) C40 C30 C20 C10 0 10 20 30 40 0 10 20 30 40 50 60 70 80 90 100 number of units 6375 g03 v s = 15v v in = 270v div = 25 gain error (ppm) C50 C40 C30 C20 C10 0 10 20 30 40 50 0 50 100 150 200 250 300 350 400 number of units 6375 g04 v s = 15v v out = 10v 1248 units from 4 runs both packages 655 units from 2 runs ms16(12) gain error (ppm) C50 C40 C30 C20 C10 0 10 20 30 40 50 0 25 50 75 100 125 150 175 200 number of units 6375 g05 v s = 15v v out = 10v 593 units from 2 runs df14(12) v s = 15v v out = 10v gain error (ppm) C50 C40 C30 C20 C10 0 10 20 30 40 50 0 25 50 75 100 125 150 175 200 number of units 6375 g06 t a = 25c, v s = 15v, unless otherwise noted. electrical characteristics downloaded from: http:///
lt 6375 8 6375fa for more information www.linear.com/lt6375 typical performance characteristics typical gain error for low supply voltages (curves offset for clarity) gain nonlinearity gain nonlinearity typical gain error for r l = 10k (curves offset for clarity) typical gain error for r l = 5k (curves offset for clarity) typical gain error for r l = 2k (curves offset for clarity) v s = 18v output voltage (v) C20 C16 C12 C8 C4 0 4 8 12 16 20 output error (2mv/div) 6375 g10 v s = 15v v s = 12v v s = 10v output voltage (v) C20 C16 C12 C8 C4 0 4 8 12 16 20 output error (2mv/div) 6375 g11 v s = 18v v s = 15v v s = 12v v s = 10v output voltage (v) C20 C16 C12 C8 C4 0 4 8 12 16 20 output error (2mv/div) 6375 g12 v s = 18v v s = 15v v s = 12v v s = 10v v s = 5v, r l = 10k? v s = 5v, r l = 2k? v s = 5v, r l = 1k? v s = 2.5v, r l = 1k? output voltage (v) C5 C4 C3 C2 C1 0 1 2 3 4 5 output error (2mv/div) 6375 g13 v s = 15v r l = 2k? output voltage (v) C15 C10 C5 0 5 10 15 C100 C80 C60 C40 C20 0 20 40 60 80 100 error (ppm) 6375 g14 v s = 15v r l = 10k? output voltage (v) C15 C10 C5 0 5 10 15 C100 C80 C60 C40 C20 0 20 40 60 80 100 error (ppm) 6375 g15 t a = 25c, v s = 15v, unless otherwise noted. typical distribution of gain nonlinearity cmrr vs frequency common mode voltage range vs power supply voltage v s = 15v v out = 10v gain nonlinearity (ppm) 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 0 50 100 150 200 250 300 number of units 6375 g07 1332 units from 4 runs both packages frequency (hz) 10 100 1k 10k 100k 1m 10m 0 20 40 60 80 100 120 common mode rejection ratio (db) 6375 g08 div = 7ms16(12) di v = 7 di v = 10 di v = 12 di v = 15 di v = 17 di v = 20 di v = 25 ott power supply voltage (v) 0 5 10 15 20 25 30 C300 C250 C200 C150 C100 C50 0 50 100 150 200 250 300 common mode operating range (v) lt6375 g09 downloaded from: http:///
lt 6375 9 6375fa for more information www.linear.com/lt6375 typical performance characteristics gain nonlinearity gain nonlinearity gain error vs temperature frequency response vs capacitive load noise density vs frequency 0.1hz to 10hz noise output voltage vs load current maximum power dissipation vs temperature gain vs frequency v s = 15v r l = 100k? output voltage (v) C15 C10 C5 0 5 10 15 C100 C80 C60 C40 C20 0 20 40 60 80 100 error (ppm) 6375 g16 v s = 15v r l = 1m? output voltage (v) C15 C10 C5 0 5 10 15 C10 C8 C6 C4 C2 0 2 4 6 8 10 error (ppm) 6375 g17 v s = 15v v out = 10v r l = 10k? 10 units temperature (c) C75 C50 C25 0 25 50 75 100 125 150 175 C100 C80 C60 C40 C20 0 20 40 60 80 100 C10 C8 C6 C4 C2 0 2 4 6 8 10 gain error (ppm) gain error (m%) 6375 g18 130c 85c 25c C45c output current (ma) 0 5 10 15 20 25 30 C20 C15 C10 C5 0 5 10 15 20 output voltage (v) 6375 g19 df14(12) ja = 43c/w ms16(12) ja = 130c/w ambient temperature (c) C60 C40 C20 0 20 40 60 80 100 120 140 160 0 1 2 3 4 5 maximum power dissipation (w) lt6375 g20 div = 7 div = 10 div = 12 div = 15 div = 17 div = 20 div = 25 frequency (mhz) 0.001 0.01 0.1 1 10 C80 C70 C60 C50 C40 C30 C20 C10 0 10 20 gain (db) 6375 g21 div = 20 0nf 0.5nf 1nf 1.5nf 2nf 3nf 5nf frequency (mhz) 0.001 0.01 0.1 1 10 C80 C70 C60 C50 C40 C30 C20 C10 0 10 20 gain (db) 6375 g22 div = 7 div = 20 frequency (hz) 1 10 100 1k 10k 100k 200 300 400 500 600 700 800 900 1000 1100 voltage noise density (nv / hz ) 6375 g23 div = 7 time (10s/div) C50 C40 C30 C20 C10 0 10 20 30 40 50 noise (v) 6375 g24 div = 20 t a = 25c, v s = 15v, unless otherwise noted. downloaded from: http:///
lt 6375 10 6375fa for more information www.linear.com/lt6375 typical performance characteristics small-signal step response small-signal step response vs capacitive load small-signal step response small-signal step response vs capacitive load large-signal step response large-signal step response time (4s/div) voltage (5v/div) 6375 g28 div = 7c l = 560pf r l = 2k 0v time (4s/div) voltage (25mv/div) 6375 g29 div = 7 c l = 560pf r l = 2k 0v div = 7r l = 2k 560pf time (s) 0 5 10 15 20 25 30 35 40 C100 C80 C60 C40 C20 0 20 40 60 80 100 120 140 voltage (mv) 6375 g30 1000pf 20pf div = 20c l = 560pf r l = 2k? time (4s/div) voltage (5v/div) 6375 g31 0v time (4s/div) voltage (25mv/div) 6375 g32 div = 20c l = 560pf r l = 2k? 0v 560pf time (s) 0 5 10 15 20 25 30 35 40 C100 C80 C60 C40 C20 0 20 40 60 80 100 120 140 voltage (mv) 6375 g33 div = 20r l = 2k? 1000pf 20pf t a = 25c, v s = 15v, unless otherwise noted. positive psrr vs frequency negative psrr vs frequency slew rate vs temperature div = 25 frequency (hz) 10 100 1k 10k 100k 0 10 20 30 40 50 60 70 80 90 100 110 120 power supply rejection ratio (db) 6375 g25 div = 7 div = 20 frequency (hz) 10 100 1k 10k 100k 0 10 20 30 40 50 60 70 80 90 100 110 120 power supply rejection ratio (db) 6375 g26 div = 25 div = 7 div = 20 r l = 10k? v s = 2.5v, rising v s = 15v, rising v s = 25v, rising v s = 2.5v, falling v s = 15v, falling v s = 25v, falling temperature (c) C75 C50 C25 0 25 50 75 100 125 150 175 0 1 2 3 4 5 6 7 slew rate (v/s) 6375 g27 downloaded from: http:///
lt 6375 11 6375fa for more information www.linear.com/lt6375 typical performance characteristics settling time settling time output offset voltage vs temperature thermal shutdown hysteresisquiescent current vs shdn voltage quiescent current vs supply voltage minimum supply voltage quiescent current vs temperature shutdown quiescent current vs supply voltage 10 units temperature (c) C75 C50 C25 0 25 50 75 100 125 150 175 200 250 300 350 400 450 500 550 quiescent current (a) 6375 g37 temperature (c) 145 150 155 160 165 170 0 100 200 300 400 500 600 supply current (a) 6375 g38 v shdn = 0v 150c 125c 85c 25c C40c C55c supply voltage (v) 0 10 20 30 40 50 0 10 20 30 40 50 quiescent current (a) lt6375 g40 v s = 15v shdn voltage (v) 0 5 10 15 0 50 100 150 200 250 300 350 400 450 500 550 quiescent current (a) 6375 g41 150c 125c 85c 25c C40c C55c t a = 125c t a = 25c t a = C45c div = 7 total supply voltage (v) 0 1 2 3 4 5 C150 C100 C50 0 50 100 150 change in offset voltage (v) 6375 g42 div = 7 error voltage time (10s/div) C1.0 C0.5 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 C4 C2 0 2 4 6 8 10 12 14 16 error voltage (mv) output voltage (v) 6375 g34 output voltage div = 7 error voltage time (10s/div) C4.0 C3.5 C3.0 C2.5 C2.0 C1.5 C1.0 C0.5 0 0.5 1.0 C16 C14 C12 C10 C8 C6 C4 C2 0 2 4 error voltage (mv) output voltage (v) 6375 g35 output voltage temperature (c) C60 C40 C20 0 20 40 60 80 100 120 140 C3000 C2250 C1500 C750 0 750 1500 2250 3000 offset voltage (v) 6375 g36 div = 20 10 units t a = 25c, v s = 15v, unless otherwise noted. t a = 150c t a = C55c parametric sweep in ~25c increments supply voltage (v) 0 10 20 30 40 50 0 100 200 300 400 500 600 quiescent current (a) 6375 g39 downloaded from: http:///
lt 6375 12 6375fa for more information www.linear.com/lt6375 typical distribution of psrr typical performance characteristics typical distribution of psrr typical distribution of psrr v s = 1.65v to 25v div = 7 psrr (v/v) C10 C8 C6 C4 C2 0 2 4 6 8 10 0 25 50 75 100 125 150 175 200 number of units 6375 g46 1352 units from 4 runs both packages v s = 1.65v to 25v div = 20 psrr (v/v) C25 C20 C15 C10 C5 0 5 10 15 20 25 0 25 50 75 100 125 150 175 200 number of units 6375 g47 1352 units from 4 runs both packages v s = 1.65v to 25v div = 25 psrr (v/v) C30 C20 C10 0 10 20 30 0 25 50 75 100 125 150 175 200 number of units 6375 g48 1352 units from 4 runs both packages t a = 25c, v s = 15v, unless otherwise noted. typical distribution of output offset voltage typical distribution of output offset voltage typical distribution of output offset voltage div = 7 offset voltage (v) C400 C300 C200 C100 0 100 200 300 400 0 25 50 75 100 125 150 175 200 number of units 6375 g43 1332 units from 4 runs both packages div = 20 offset voltage (v) C1200 C800 C400 0 400 800 1200 0 25 50 75 100 125 150 175 200 number of units 6375 g44 1332 units from 4 runs both packages div = 25 offset voltage (v) C1500 C1000 C500 0 500 1000 1500 0 25 50 75 100 125 150 175 200 number of units 6375 g45 1332 units from 4 runs both packages downloaded from: http:///
lt 6375 13 6375fa for more information www.linear.com/lt6375 pin functions v + (pin 9/pin 10): positive supply pin. v C (exposed pad pin 15/pin 8): negative supply pin. out (pin 8/pin 9): output pin. +in ( pin 1/ pin 1): noninverting input pin. accepts input voltages from 270v to C270v. +refa ( pin 3/ pin 3): reference pin a. sets the input common mode range and the output noise and offset.+refb ( pin 4/ pin 5): reference pin b. sets the input common mode range and the output noise and offset.+refc ( pin 5/ pin 6): reference pin c. sets the input common mode range and the output noise and offset.Cin ( pin 14/ pin 16): inverting input pin. accepts input voltages from 270v to C270v. (dfn/msop) Crefa ( pin 12/ pin 14): reference pin a. sets the input common mode range and the output noise and offset.Crefb ( pin 11/ pin 12): reference pin b. sets the input common mode range and the output noise and offset.Crefc ( pin 10/ pin 11): reference pin c. sets the input common mode range and the output noise and offset.ref ( pin 6/ pin 7): reference input. sets the output level when the difference between the inputs is zero.shdn ( pin 7) dfn only: shutdown pin. amplifier is ac- tive when this pin is tied to v + or left floating. pulling the pin >2.5 v below v + causes the amplifier to enter a low power state. downloaded from: http:///
lt 6375 14 6375fa for more information www.linear.com/lt6375 block diagram C + v + v C v + out ref Crefa Cin+in Crefb 19k 38k 190k 190k 190k 23.75k Crefc +refa +refb +refc 6375 bd 19k 38k shdn 10a 23.75k 190k applications information transfer function the lt6375 is a unity-gain difference amplifier with the transfer function: v out = (v +in C v Cin ) + v ref the voltage on the ref pin sets the output voltage when the differential input voltage ( v diff = v +in C v Cin ) is zero. this reference is used to shift the output voltage to the desired input level of the next stage of the signal chain. benefits of selectable resistor divider ratios the lt6375 offers smaller package size, better gain ac - curacy and better noise performance than existing high common mode voltage range difference amplifiers. ad- ditionally, the lt6375 allows the user to maximize system performance by selecting the resistor divider ratio ( div) appropriate to their input common mode voltage range. a higher resistor divider ratio ( div) enables higher common mode voltage range at the input pins, but also increases output noise, output offset/drift and decreases the C3 db bandwidth. therefore, a trade-off exists between input range and dc, ac, and drift performance of the part. it is recommended that the user choose the lowest resistor divider ratio that achieves the required input common mode voltage range in their application to maximize the system snr, precision and speed . table 1 shows the noise, offset/drift, and C3 db bandwidth of the lt6375 for all different reference pins configurations . common mode voltage range the wide common mode voltage range of the lt6375 is enabled by both a resistor divider at the input of the op amp and by an internal op amp that can withstand high input voltages. the internal resistor network of the lt6375 divides down the input common mode voltage. the resulting voltage at the op amp inputs determines the op amps operating region. in the configuration shown in figure 1, a resistor divider is created at both op amp inputs by the 190 k input resistor and the resistance from each input to ground, which is ~31.66 k. the resistance to ground is formed by the 38 k ( refb resistors) in parallel with the 190 k ( feed - back/ref resistor). the result is a divide by 7 of the input voltage. as shown in tables 1 to?5, different connections to reference pins ( i.e. pins + refa , C refa , + refb , C refb, downloaded from: http:///
lt 6375 15 6375fa for more information www.linear.com/lt6375 C + v + v C v s + v s + v Cin v +in v s C out v out ref Crefa Cin+in Crefb 19k 38k 190k 190k 190k 23.75k Crefc +refa +refb +refc 6375 f01 19k 38k shdn 23.75k 190k figure 1. basic connections for dual-supply operation (resistor divider ratio = 7) +refc , C refc) result in different resistor divider ratios (div) and different attenuation of the lt6375s input common mode voltage. the internal op amp of lt6375 has two operating regions: a) if the common mode voltage at the inputs of the internal op amp ( v cmop ) is between v C and v + C1.75 v, the op amp operates in its normal region; b) if v cmop is between v + C1.75v and v C +76 v, the op amp continues to operate, but in its over-the- top region with degraded performance (see over-the- top operation section of this data sheet for more detail). table 2 lists the valid input common mode voltage range for an lt6375 with different configurations of the refer - ence pins when used with dual power supplies. using the voltage ranges in this table ensures that the internal op amp is operating in its normal ( and best) region. the figure entitled common mode voltage range vs power supply voltage, in the typical performance characteristics section of this data sheet, illustrates the information in table 2 graphically. table 3 lists the valid input common mode voltage range for an lt6375 that results in the internal op amp operating in its over-the- top region. the reference pins can be connected to ground ( as in tables?2 and 3) or to any reference voltage. in order to achieve the specified gain accuracy and cmrr perfor - mance of the lt6375, this reference must have a very low impedance. the valid input common mode range changes depending on the voltages chosen for reference pins. one positive and one negative reference should always be con - nected to a low impedance voltage to ensure the stability of the amplifier. table 4 lists the valid input common mode voltage range for an lt6375 when the part is used with a single power supply, and ref and the other reference pins are connected to mid-supply. if, as shown in table 5, the ref pin remains connected to mid-supply, while the other reference pins are connected to ground, the result is a higher positive input range at the expense of a more restricted negative input range. table 1. lt6375 performance at different resistor divider ratios resistor divider options resistor divider ratio (div) differential gain output noise at 1khz (nv/ hz ) maximum offset (v) maximum offset drift (v/c) C3db bandwidth (khz) + refa and C refa + refb and C refb + refc and C refc ref 19k 38k 23.75k 190 k lt6375a lt6375 lt6375a lt6375 open gnd open ref 7 1 250 300 450 9 12 575 open open gnd ref 10 1 307 380 600 12 16 530 gnd open open ref 12 1 346 450 720 14 19 485 open gnd gnd ref 15 1 410 540 900 16 22 445 gnd gnd open ref 17 1 445 600 1000 19 25 405 gnd open gnd ref 20 1 508 700 1200 23 30 375 gnd gnd gnd ref 25 1 599 900 1500 28 37 310 applications information downloaded from: http:///
lt 6375 16 6375fa for more information www.linear.com/lt6375 applications information table 2. common mode voltage operating range with dual power supplies (normal region) input range (ref = gnd) + refa and C refa + refb and C refb + refc and C refc div v s = 2.5v v s = 15v v s = 25v high low high low high low open gnd open 7 5.25 C17.5 92.75 C105 162.75 C175 open open gnd 10 7.5 C25 132.5 C150 232.5 C250 gnd open open 12 9 C30 159 C180 270 C270 open gnd gnd 15 11.25 C37.5 198.75 C225 270 C270 gnd gnd open 17 12.75 C42.5 225.25 C255 270 C270 gnd open gnd 20 15 C50 265 C270 270 C270 gnd gnd gnd 25 18.75 C62.5 270 C270 270 C270 table 3. common mode voltage operating range with dual power supplies (over-the- top region) input range (ref = gnd) + refa and C refa + refb and C refb + refc and C refc div v s = 2.5v v s = 15v v s = 25v high low high low high low open gnd open 7 270 C17.5 270 C105 270 C175 open open gnd 10 270 C25 270 C150 270 C250 gnd open open 12 270 C30 270 C180 270 C270 open gnd gnd 15 270 C37.5 270 C225 270 C270 gnd gnd open 17 270 C42.5 270 C255 270 C270 gnd open gnd 20 270 C50 270 C270 270 C270 gnd gnd gnd 25 270 C62.5 270 C270 270 C270 table 4. common mode voltage operating range with a single power supply, references to mid-supply (normal region) input range (ref = v s /2) + refa and C refa + refb and C refb + refc and C refc div v s = 5v v s = 30v v s = 50v high low high low high low open v s /2 open 7 7.75 C15 107.75 C90 187.75 C150 open open v s /2 10 10 C22.5 147.5 C135 257.5 C225 v s /2 open open 12 11.5 C27.5 174 C165 270 C270 open v s /2 v s /2 15 13.75 C35 213.75 C210 270 C270 v s /2 v s /2 open 17 15.25 C40 240.25 C240 270 C270 v s /2 open v s /2 20 17.5 C47.5 270 C270 270 C270 v s /2 v s /2 v s /2 25 21.25 C60 270 C270 270 C270 table 5. common mode voltage operating range with a single power supply, references to gnd (normal region) input range (ref = v s /2) + refa and C refa + refb and C refb + refc and C refc div v s = 5v v s = 30v v s = 50v high low high low high low open gnd open 7 20.25 C2.5 182.75 C15 270 C25 open open gnd 10 30 C2.5 267.5 C15 270 C25 gnd open open 12 36.5 C2.5 270 C15 270 C25 open gnd gnd 15 46.25 C2.5 270 C15 270 C25 gnd gnd open 17 52.75 C2.5 270 C15 270 C25 gnd open gnd 20 62.5 C2.5 270 C15 270 C25 gnd gnd gnd 25 78.75 C2.5 270 C15 270 C25 the lt6375 will not operate correctly if the common mode voltage at its input pins goes below the range specified in above tables, but the part will not be damaged as long as the lowest common mode voltage at the inputs of the internal op amp ( v cmop ) remains between v C C25 v and v C . also, the voltage at lt6375 input pins should never be higher than 270 v or lower than C270 v under any circumstances. shutdown the lt6375 in the dfn14 package has a shutdown pin ( shdn ). under normal operation this pin should be tied to v + or allowed to float. tying this pin to 2.5 v below v + will cause the part to enter a low power state. the sup- ply current is reduced to less than 25 a and the op amp output becomes high impedance. supply volt age the positive supply pin of the lt6375 should be bypassed with a small capacitor ( typically 0.1 f ) as close to the supply pin as possible. when driving heavy loads an additional 4.7f electrolytic capacitor should be added. when using split supplies, the same is true for the v C supply pin. downloaded from: http:///
lt 6375 17 6375fa for more information www.linear.com/lt6375 applications information accurate current measurements the lt6375 can be used in high side, low side and bi- directional wide common mode range current sensing. figure 2 shows the lt6375 sensing current by measuring the voltage across r sense . the added sense resistors create a cmrr error and a gain error . for r sense greater than 2 the source resistance mismatch degrades the cmrr. adding a resistor equal in value to r sense in series with the +in terminal (r c ) eliminates this mismatch. using an r sense greater than 10 will cause the gain error to exceed the 0.006% specification of lt6375. this is due to the loading effects of the lt6375. v out = i load ? r sense ? 190k/(190k + r sense ) increasing r sense and r c slightly to r sense ' removes the gain error. r sense ' = r sense ? 190k/(190k C r sense ). noise and filtering the noise performance of the lt6375 can be optimized both by appropriate choice of its internal attenuation set - ting and by the addition of a filter to the amplifier output (figure 3). for applications that do not require the full bandwidth of the lt6375, the addition of an output filter will lower system noise. table 6 shows the output noise for different internal resistor divider ratios and output filter bandwidths. C + v + v C v s + v s + = 15v r sense v s C = C15v out v out ? r sense ? i load v source + = 270v v source C = C270v i load i load v out ? r sense ? i load ref v ref Crefa Cin+in Crefb 19k 38k 190k 190k 190k 23.75k Crefc +refa +refb +refc 19k 38k shdn 23.75k r c 190k C + v + v C v s + v s + = 15v v s C = C15v out ref v ref Crefa Cin+in Crefb 19k 38k 190k 190k 190k 23.75k Crefc +refa +refb +refc 6375 f02 19k 38k shdn 23.75k 190k r c r sense load figure 2. wide voltage range current sensing downloaded from: http:///
lt 6375 18 6375fa for more information www.linear.com/lt6375 figure 3. output filtering with 2-pole butterworth filter C + v + v C v s + v s + v Cin v +in v s C out ref v ref Crefa Cin+in Crefb 19k 38k 190k 190k 190k 23.75k Crefc +refa +refb +refc 6375 f03 19k 38k shdn 23.75k r1 r2 c2 c1 190k C + v out lt6015 applications information table 6. output noise (v p-p ) for 2-pole butterworth filter for different internal resistor divider ratioscorner frequency 7 10 12 15 17 20 25 no filter 1705 v 1831 v 1901 v 2008 v 2073 v 2177 v 2330 v 100khz 537 v 662 v 740 v 853 v 925 v 1030 v 1197 v 10khz 169 v 210 v 236 v 274 v 298 v 334 v 393 v 1 khz 54 v 67 v 75 v 87 v 95 v 107 v 126 v 100hz 18 v 22 v 25 v 29 v 32 v 36 v 43 v table 7. component values for different 2-pole butterworth filter bandwidths corner frequency r1 r2 c1 c2 100khz 11k 11.3k 100pf 200pf 10khz 11k 11.3k 1nf 2nf 1khz 11k 11.3k 10nf 20nf 100hz 11k 11.3k 0.1f 0.2f figure 4. current measurement application C + v + v C 15v r sense 10 C15v out v out v source + = 195v 1a ref Crefa Cin+in Crefb 19k 38k 190k 190k 190k 23.75k Crefc +refa +refb +refc 6375 f04 19k 38k shdn 23.75k r c , 10 190k load downloaded from: http:///
lt 6375 19 6375fa for more information www.linear.com/lt6375 error budget analysis figure 4 shows the lt6375 in a current measurement application. the error budget for this application is shown in table 8. the resistor divider ratio is set to 15 to divide the 195 v input common mode voltage down to 13 v at the op amp inputs. the 1 a current and 10 sense resistor produce an output full-scale voltage of 10 v. table 8 shows the error sources in parts per million ( ppm) of the full - scale voltage across the temperature range of 25c to 85c. different sources of error contribute to the maximum ac - curacy that can be achieved in an application. gain error, offset voltage and common mode rejection error combine to set the initial error. additionally, the gain error and offset voltage drift across the temperature range. the excellent gain accuracy, low offset voltage, high cmrr, low offset voltage drift and low gain error drift of the lt6375 all combine to enable extremely accurate measurements. over-the- top operation when the input common mode voltage of the internal op amp ( v cmop ) in the lt6375 is biased near or above the v + supply, the op amp is operating in the over - the - top region . the op amp continues to operate with an input common mode voltage of up to 76 v above v C ( regardless of the positive power supply voltage v + ), but its performance is table 8. error budget analysis error source lt6375a lt6375 competitor 1 competitor 2 error, ppm of fs lt6375a lt6375 competitor 1 competitor 2 accuracy, t a = 25c initial gain error 0.0035% fs 0.006% fs 0.02% fs 0.03% fs 35 60 200 300 offset voltage 540v 900v 1100v 500v 54 90 110 50 common mode 195v/96db = 3090v 195v/89db = 6920v 195v/90db = 6166v 195v/86db = 9770v 309 692 617 977 total accuracy error 398 842 927 1327 temperature drift gain 1ppm/c 60c 1ppm/c 60c 10ppm/c 60c 10ppm/c 60c 60 60 600 600 offset voltage 16v/c 60c 22v/c 60c 15v/c 60c 10v/c 60c 96 132 90 60 total drift error 156 192 690 660 total error 554 1034 1617 1987 applications information degraded. the op amps input bias currents change from under 2 na to 14 a . the op amp s input offset current rises to 50 na which adds 9.5 mv to the output offset voltage. in addition, when operating in the over-the- top region, the differential input impedance decreases from 1 m in normal operation to approximately 3.7 k in over-the- top operation. this resistance appears across the summing nodes of the internal op amp and boosts noise and offset while decreasing speed. noise and offset will increase by between 66% and 83% depending on the resistor divider ratio setting. the bandwidth will be reduced by 40% to 45%. for more detail on over-the- top operation, consult the lt6015 data sheet. output the output of the lt6375 can typically swing to within 5mv of either rail with no load and is capable of sourcing and sinking approximately 25 ma. the lt6375 is internally compensated to drive at least 1 nf of capacitance under any output loading conditions. for larger capacitive loads, a 0.22 f capacitor in series with a 150 resistor between the output and ground will compensate the amplifier to drive capacitive loads greater than 1 nf. additionally, the lt6375 has more gain and phase margin as the resistor divider ratio is increased. downloaded from: http:///
lt 6375 20 6375fa for more information www.linear.com/lt6375 the power dissipated in the internal resistors ( p resd ) depends on the input voltage, the resistor divider ratio (div), the output voltage and the voltage on ref and the other reference pins. the following equations and figure 5 show different components of p resd corresponding to different groups of lt6375s internal resistors ( assuming that lt6375 is used with a dual supply configuration with ref and all reference pins at ground). p resda = (v +in ) 2 /(190k + 190k/(div C 1)) p resdb = (v Cin C v +in /div) 2 /(190k) p resdc = (v +in /div) 2 /(190k/(div C 2)) p resdd = (v +in /div C v out ) 2 /(190k) p resd = p resda + p resdb + p resdc + p resdd p resd simplifies to: p resd = 2 (v + in 2 ((div C 1)/ div C v out /v + in ) + v out 2 )/190 k in general, p resd increases with higher input voltage, higher resistor divider ratio ( div), and lower output, ref and reference pin voltages. example: an lt6375 in a dfn package mounted on a pc board has a thermal resistance of 43 c/w. operating on 25v supplies and driving a 2.5 k load to 12.5 v with v +in = 270 v and div = 25, the total power dissipation is given by: p d = (50 ? 0.6ma) + 12.5 2 /2.5k + 270 2 /197.92k + (257.5 C 270/25) 2 /190k + (270/25) 2 /8.26k + (270/25 C 12.5) 2 /190k = 0.795w applications information figure 5. power dissipation example C + v + v C v Cin = 270v C v out v +in = 270v = 257.5v v s + = 25v v s _ = C25v out v out = 12.5v ref Crefa Cin+in Crefb 19k 38k 190k p resdd p resdc p resdb p resda 190k 190k 23.75k Crefc +refa +refb +refc 6375 f05 19k 38k shdn 23.75k 190k distortion the lt6375 features excellent distortion performance when the internal op amp is operating within the supply rails. operating the lt6375 with input common mode voltages that go from normal to over-the- top operation will significantly degrade the lt6375s linearity as the op amp must transition between two different input stages. power dissipation considerations because of the ability of the lt6375 to operate on power supplies up to 25 v, to withstand very high input volt - ages and to drive heavy loads, there is a need to ensure the die junction temperature does not exceed 150 c. the lt6375 is housed in df 14 ( ja = 43 c/w, jc = 4 c/w) and ms16 ( ja = 130c/w) packages. in general, the die junction temperature ( t j ) can be esti- mated from the ambient temperature ( t a ), and the device power dissipation (p d ): t j = t a + p d ? ja power is dissipated by the amplifiers quiescent current, by the output current driving a resistive load and by the input current driving the lt6375 s internal resistor network . p d = ((v s + C v s C ) ? i s ) + p od + p resd for a given supply voltage, the worst-case output power dissipation p od(max) occurs with the output voltage at half of either supply voltage. p od(max) is given by: p od(max) = (v s /2) 2 /r load downloaded from: http:///
lt 6375 21 6375fa for more information www.linear.com/lt6375 applications information assuming a thermal resistance of 43 c/w, the die tem- perature will experience a 34 c rise above ambient. this implies that the maximum ambient temperature the lt6375 should operate under the above conditions is: t a =150c C 34c = 116c keep in mind that the dfn package has an exposed pad which can be used to lower the ja of the package. the more pcb metal connected to the exposed pad, the lower the thermal resistance. the msop package has no exposed pad and a higher thermal resistance ( ja = 130 c/w). it should not be used in applications which have a high ambient temperature, require driving a heavy load, or require an extreme input voltage.thermal shutdown for safety, the lt6375 will enter shutdown mode when the die temperature rises to approximately 163 c. this thermal shutdown has approximately 9 c of hysteresis requiring the die temperature to cool 9 c before enabling the amplifier again. use at other precision dc gains the array of resistors within the lt6375 provides numer - ous configurable connections that provide precision gains other than the unity differential gain options described previously. note that only the + in and C in pins can oper - ate outside of the supply window. since most of these alternate configurations involve driving the refx pins, as well as the + in and Cin pins, the input signals must be less than the supply voltages. fully differential gains are available as shown in table 9, and may be output-shifted with a ref offset signal. these configurations allow the lt6375 to be used as a versatile precision gain block with essentially no external components besides the supply decoupling. in most cases, only a single positive supply will be required. in table 9, connections are identified as nc ( no connect), input ( refers to both inputs driven, +signal to + pins,Csignal to C pins), cross ( refers to inputs cross-coupled , + signal to C pins , C signal to + pins), out (refers to the output fed back to C pins), or ref ( refers to connecting the ref pin to + pins). the same configurations provide inverting gains by grounding any pins intended for the + signal source. the differential input resistance is also tabulated as well as the amplification factor of the internal gain section involved ( noise-gain, which helps to estimate the error-budget of the configuration). single-ended noninverting gains are also available as shown in table 10, including many that operate as buffers (loaded only by the op amp input bias). a rich option set exists by using the ref pin as an additional variable. tw o attenuation options exist that can accept signals outside the power supply range since they only drive the + in pin. in table 10, connections are identified as nc ( no connect), input ( driven by the input), out ( fed back from the output), or ground ( grounded). table 10 also includes tabulations of the internal resistor divider ( div), noise gain ( re-amplification), and the input loading presented by the circuit. use as precision ac gain block in ac-coupled applications operating from a single power supply, it is useful to set the output voltage at mid-supply to maximize dynamic range. the lt6375 readily supports this with no additional biasing components by connecting specific pins to the v + and v C potentials and ac-coupling the signal paths. table 11 shows the available inverting gains and also tabulates the load resistances presented at the input. in table 11, connections are identified as nc ( no connect), ac in ( ac-coupled to the input) out ( fed back from the output), tied to v + , tied to v C , or ac gnd ( ac- grounded). all pins that require an ac ground can share a single bypass capacitor. likewise, all pins driven from the source signal may share a coupling capacitor as well. the output should also connect to the load circuitry using a coupling capacitor to block the mid-supply dc voltage. the lt6375 may also be used for single-supply nonin - verting ac gains by employing a combination of input attenuation and re-amplification. with numerous choices of attenuation and re - amplification, several hundred overall gain combinations are possible, ranging from 0.167 to 23. the combinations are more plentiful than the dc configura - tions because there is no constraint on matching internal source resistances to minimize offset. downloaded from: http:///
lt 6375 22 6375fa for more information www.linear.com/lt6375 table 9. configurations for precision differential gains other than unity lt6375 differential and inverting precision dc gains gain in refa refb refc ref diff r in (k) noise gain 0.167 cross input out/ref cross ref 20 4.2 0.333 nc input out/ref cross ref 21 4.0 0.5 input input out/ref cross ref 20 4.2 1.5 out/ref nc cross input ref 29 7.5 2 cross nc cross input ref 27 15.0 2.5 out/ref input cross nc ref 25 8.5 2.833 cross input out/ref input ref 20 4.2 3 nc input out/ref input ref 21 4.0 3.167 input input out/ref input ref 20 4.2 3.5 out/ref input input cross ref 17 12.5 4 cross nc input nc ref 63 7.0 5 nc nc input nc ref 76 6.0 6 input nc input nc ref 63 7.0 7 cross nc nc input ref 42 10.0 8 nc nc nc input ref 48 9.0 9 input nc nc input ref 42 10.0 10 nc input nc nc ref 38 11.0 11 input input nc nc ref 35 12.0 12 cross nc input input ref 27 15.0 13 nc nc input input ref 29 14.0 14 input nc input input ref 27 15.0 15 nc input input nc ref 25 16.0 16 input input input nc ref 24 17.0 17 cross input nc input ref 20 20.0 18 nc input nc input ref 21 19.0 19 input input nc input ref 20 20.0 22 cross input input input ref 16 25.0 23 nc input input input ref 17 24.0 24 input input input input ref 16 25.0 applications information the input attenuator section dedicates some pins to es- tablishing a mid-supply bias point and with the remaining pins, provides several choices of input signal division fac- tors as shown in table 12. the high attenuations that only use + in for the signal path can accept waveform peaks that significantly exceed the supply range. table 12 also includes tabulations of the resulting ac load resistance presented to the signal source. here again, all pins that require an ac-ground connection may share a single by - pass capacitor, and all ac signal connections may share a coupling capacitor. note that configurations with + in to v + will bias at 50% of supply, while the others shown will bias at 38% of supply.the single - supply ac - coupled noninverting circuit is completed by configuring the post-attenuator amplifica - tion factor. table 13 shows the available re-amplification factors. once again, all pins that require an ac-ground connection may share a single bypass capacitor, and the output should use a coupling capacitor to its load destination as well. downloaded from: http:///
lt 6375 23 6375fa for more information www.linear.com/lt6375 table 10. configurations for precision noninverting gains lt6375 noninverting precision dc gains gain feature +in +refa +refb +refc ref Cin Crefa Crefb Crefc noise gain div r in (k) 0.167 wide input input ground ground ground ground ground ground out ground 4.167 25 198 0.333 input ground ground ground input ground ground out ground 4.167 12.5 103 0.5 wide input input nc nc ground ground out nc nc ground 5 10 302 0.833 nc ground input ground ground nc ground out ground 4 4.8 48 1 input nc nc ground input out nc nc ground 5 5 170 1.167 input ground input ground input ground ground out ground 4.167 3.571 38 1.333 ground ground ground input nc nc ground out ground 4 3 36 1.5 nc ground ground input input nc ground out ground 4 2.667 34 1.667 nc input ground ground ground nc ground out ground 4 2.400 33 1.833 input input ground ground nc nc ground out ground 4 2.182 32 2 input nc ground nc input ground nc ground nc 7 3.500 37 2.167 ground ground input input nc nc ground out ground 4 1.846 32 2.333 input ground input input nc nc ground out ground 4 1.714 33 2.5 nc ground input nc nc out nc ground ground 7.5 3 57 2.667 input input input ground nc nc ground out ground 4 1.500 36 2.833 input input input ground input ground ground out ground 4.167 1.471 35 3 input nc input ground ground out nc ground ground 7.5 2.500 53 3.167 input input ground input nc nc ground out ground 4 1.263 48 3.333 input input ground input input ground ground out ground 4.167 1.250 47 3.5 input nc input ground input out nc ground ground 7.5 2.143 51 3.833 ground input input input ground ground ground out ground 4.167 1.087 103 4 buffer input input input input nc nc ground out ground 4 1 hi-z 4.167 buffer input input input input input ground ground out ground 4.167 1 hi-z 4.5 input nc nc input ground out nc nc ground 5 1.111 302 5 buffer nc input nc nc nc out nc nc ground 5 1 hi-z 5.5 input input nc nc ground out ground nc nc 6 1.091 226 6 buffer input nc input nc nc nc nc ground nc 6 1 hi-z 6.5 ground nc input input ground out nc ground ground 7.5 1.154 110 7 buffer input nc input nc input ground nc ground nc 7 1 hi-z 7.5 buffer nc input input nc nc out nc ground ground 7.5 1 hi-z 8 nc nc nc input ground nc nc nc ground 9 1.125 321 8.5 buffer nc nc nc input ground out ground ground nc 8.5 1 hi-z 9 buffer input nc nc input nc nc nc nc ground 9 1 hi-z 9.5 input input nc input ground out ground nc ground 10 1.053 200 10 buffer nc input nc nc nc ground nc nc ground 10 1 hi-z 11 buffer input input nc nc nc nc ground nc nc 11 1 hi-z 11.5 ground input input input ground out ground ground ground 12.5 1.087 103 applications information downloaded from: http:///
lt 6375 24 6375fa for more information www.linear.com/lt6375 applications information table 10. configurations for precision noninverting gains gain feature +in +refa +refb +refc ref Cin Crefa Crefb Crefc noise gain div r in (k) 12 buffer input input nc nc input ground ground nc nc 12 1 hi-z 12.5 buffer input input input input input out ground ground ground 12.5 1 hi-z 13 nc nc input input ground nc nc ground ground 14 1.077 205 14 buffer input nc input input nc nc nc ground ground 14 1 hi-z 15 buffer nc input input nc nc ground nc ground ground 15 1 hi-z 16 buffer input input input nc nc nc ground ground nc 16 1 hi-z 17 buffer nc nc nc input ground ground ground ground nc 17 1 hi-z 18 nc input nc input ground nc ground nc ground 19 1.056 201 19 buffer input input nc input nc nc ground nc ground 19 1 hi-z 20 buffer input input nc input input ground ground nc ground 20 1 hi-z 23 nc input input input ground nc ground ground ground 24 1.043 198 24 buffer input input input input nc nc ground ground ground 24 1 hi-z 25 buffer input input input input input ground ground ground ground 25 1 hi-z table 11. configurations for single-supply ac-coupled inverting gains lt6375 single-supply inverting ac gains gain Cin Crefa Crefb Crefc +in +refa +refb +refc ref ac r in (k) C3 nc ac in out ac in v + ac gnd ac gnd ac gnd v C 11 C3.167 ac in ac in out ac in v + ac gnd ac gnd ac gnd v C 10 C5 nc nc ac in nc v + ac gnd ac gnd ac gnd v C 38 C6 ac in nc ac in nc v + ac gnd ac gnd ac gnd v C 32 C8 nc nc nc ac in v + ac gnd ac gnd ac gnd v C 24 C9 ac in nc nc ac in v + ac gnd ac gnd ac gnd v C 21 C10 nc ac in nc nc v + ac gnd ac gnd ac gnd v C 19 C11 ac in ac in nc nc v + ac gnd ac gnd ac gnd v C 17 C13 nc nc ac in ac in v + ac gnd ac gnd ac gnd v C 15 C14 ac in nc ac in ac in v + ac gnd ac gnd ac gnd v C 14 C15 nc ac in ac in nc v + ac gnd ac gnd ac gnd v C 13 C16 ac in ac in ac in nc v + ac gnd ac gnd ac gnd v C 12 C18 nc ac in nc ac in v + ac gnd ac gnd ac gnd v C 11 C19 ac in ac in nc ac in v + ac gnd ac gnd ac gnd v C 10 C23 nc ac in ac in ac in v + ac gnd ac gnd ac gnd v C 8 C24 ac in ac in ac in ac in v + ac gnd ac gnd ac gnd v C 8 downloaded from: http:///
lt 6375 25 6375fa for more information www.linear.com/lt6375 applications information table 12. configurations for single-supply ac-coupled input attenuations lt6375 single-supply ac attenuator configurations div +in +refa +refb +refc ref ac r in (k) 1.087 v + ac in ac in ac in v C 103 1.111 v + ac in nc ac in v C 106 1.133 v + ac in ac in nc v C 108 1.154 v + nc ac in ac in v C 110 1.2 v + ac in nc nc v C 114 1.25 v + nc nc ac in v C 119 1.389 v + ac in ac gnd ac in v C 38 1.4 v + nc ac in nc v C 133 1.7 v + ac in ac gnd nc v C 46 1.875 v + nc ac gnd ac in v C 51 1.923 v + ac gnd ac in ac in v C 30 2.083 ac in ac in v + v C ac in 30 2.182 ac in ac in v + v C nc 32 2.273 ac in ac in v + v C ac gnd 31 2.3 nc ac in v + v C nc 34 2.4 nc ac in v + v C ac gnd 33 2.5 v + ac in ac gnd ac gnd v C 32 3.125 v + ac gnd ac gnd ac in v C 35 3.4 v + ac gnd ac in nc v C 54 5 v + ac gnd ac in ac gnd v C 47 7.5 ac in nc v + v C ac in 110 12 ac in ac gnd v + v C ac in 103 14 ac in nc v + v C nc 205 15 ac in nc v + v C ac gnd 204 24 ac in ac gnd v + v C nc 198 25 ac in ac gnd v + v C ac gnd 198 downloaded from: http:///
lt 6375 26 6375fa for more information www.linear.com/lt6375 applications information table 13. configurations for single-supply ac-coupled re-amplications lt6375 noninverting ac re-amplifications gain Cin Crefa Crefb Crefc 4 nc ac gnd out ac gnd 4.167 ac gnd ac gnd out ac gnd 5 out nc nc ac gnd 6 nc nc ac gnd nc 7 ac gnd nc ac gnd nc 7.5 out nc ac gnd ac gnd 8.5 out ac gnd ac gnd nc 9 nc nc nc ac gnd 10 ac gnd nc nc ac gnd 11 nc ac gnd nc nc 12 ac gnd ac gnd nc nc 12.5 out ac gnd ac gnd ac gnd 14 nc nc ac gnd ac gnd 15 ac gnd nc ac gnd ac gnd 16 nc ac gnd ac gnd nc 17 ac gnd ac gnd ac gnd nc 19 nc ac gnd nc ac gnd 20 ac gnd ac gnd nc ac gnd 24 nc ac gnd ac gnd ac gnd 25 ac gnd ac gnd ac gnd ac gnd downloaded from: http:///
lt 6375 27 6375fa for more information www.linear.com/lt6375 typical applications C + v + v C v bat = 48v v s = 12v v bat 6 out v out = ref Crefa Cin+in Crefb 19k 38k 190k 190k 190k 23.75k Crefc +refa +refb +refc 6375 ta02 19k 38k shdn 23.75k 190k C + v + v C v s = 3.3v to 50v out v out ref Crefa Cin 2.2f 2.2f +in Crefb 19k 38k 190k v in 190k 190k 23.75k Crefc +refa +refb +refc 6375 ta03 19k 38k shdn 23.75k 190k v out v in = C24 2.2f telecom supply monitor 27db audio gain stage downloaded from: http:///
lt 6375 28 6375fa for more information www.linear.com/lt6375 typical applications C + v + v C v s + v s C out ref Crefa Cin+in Crefb 19k 38k 190k v ctl = 1v 190k 190k 23.75k Crefc +refa +refb +refc 6375 ta04 19k 38k shdn 23.75k 190k v ctl r s 32.4 6 ? r s i out = v out 41.6k load C v out C + v + v C out ref Crefa Cin+in Crefb 19k 38k 190k v ref 190k 190k 23.75k Crefc +refa +refb +refc 6375 ta05 19k 38k shdn 23.75k 190k v ref 2 v out = 5ma howland current source precision reference divider/buffer downloaded from: http:///
lt 6375 29 6375fa for more information www.linear.com/lt6375 package description please refer to http:// www .linear.com/product/lt6375#packaging for the most recent package drawings. 4.00 0.10 (4 sides) note:1. package outline does not conform to jedec mo-229 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 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 1top mark (note 6) 0.40 0.10 1 7 14 8 bottom view?exposed pad 1.70 0.10 0.75 0.05 r = 0.115 typ 0.25 0.05 0.50 bsc 3.00 ref 3.38 0.10 0.200 ref 0.00 ? 0.05 (df14)(12) dfn 1113 rev 0 recommended solder pad pitch and dimensions apply solder mask to areas that are not soldered 0.70 0.05 0.25 0.05 0.50 bsc 3.10 0.05 4.50 0.05 package outline pin 1 notch 0.35 45 chamfer 1.70 0.05 3.38 0.05 3.00 ref 1.00 bsc 1.00 bsc df package 14(12)-lead plastic dfn (4mm 4mm) (reference ltc dwg # 05-08-1963 rev ?) downloaded from: http:///
lt 6375 30 6375fa for more information www.linear.com/lt6375 package description please refer to http:// www .linear.com/product/lt6375#packaging for the most recent package drawings. msop (ms12) 0213 rev b 0.53 0.152 (.021 .006) seating plane 0.18 (.007) 1.10 (.043) max 0.17 C?0.27 (.007 C .011) typ 0.86 (.034) ref 1.0 (.0394) bsc 0.50 (.0197) bsc 16 14 121110 1 3 5 6 7 8 9 note:1. dimensions in millimeter/(inch) 2. drawing not to scale 3. dimension does not include mold flash, protrusions or gate burrs. mold flash, protrusions or gate burrs shall not exceed 0.152mm (.006") per side 4. dimension does not include interlead flash or protrusions. interlead flash or protrusions shall not exceed 0.152mm (.006") per side 5. lead coplanarity (bottom of leads after forming) shall be 0.102mm (.004") max 0.254 (.010) 0 C 6 typ detail a detail a gauge plane 5.10 (.201) min 3.20 C 3.45 (.126 C .136) 0.889 0.127 (.035 .005) recommended solder pad layout 0.305 0.038 (.0120 .0015) typ 0.50 (.0197) bsc 1.0 (.0394) bsc 4.039 0.102 (.159 .004) (note 3) 0.1016 0.0508 (.004 .002) 3.00 0.102 (.118 .004) (note 4) 0.280 0.076 (.011 .003) ref 4.90 0.152 (.193 .006) ms package 16 (12)-lead plastic msop with 4 pins removed (reference ltc dwg # 05-08-1847 rev b) downloaded from: http:///
lt 6375 31 6375fa for more information www.linear.com/lt6375 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. revision history rev date description page number a 12/15 added a-grade. 1-7, 15, 19 downloaded from: http:///
lt 6375 32 6375fa for more information www.linear.com/lt6375 ? linear technology corporation 2015 lt 1215 rev a ? printed in usa linear technology corporation 1630 mccarthy blvd., milpitas, ca 95035-7417 (408) 432-1900 fax : (408) 434-0507 www.linear.com/lt6375 related parts typical application part number description comments lt1990 250v input range difference amplifier 2.7v to 36v operation, cmrr > 70db, input voltage = 250v lt1991 precision, 100a gain selectable amplifier 2.7v to 36v operation, 50v offset, cmrr > 75b, input voltage = 60v lt1996 precision, 100a gain selectable amplifier micropower, pin selectable up to gain = 118 lt1999 high voltage, bidirectional current sense amplifier C5v to 80v, 750 v, cmrr 80db 100khz gain: 10v/v, 20v/v, 50v/v lt6015/lt6016/lt6017 single, dual, and quad, over-the- top precision op amp 3.2mhz, 0.8v/s, 50v v os , 3v to 50v v s , 0.335ma i s , rrio ltc6090 140v operational amplifier 50pa i b , 1.6mv v os , 9.5v to 140v v s , 4.5ma i s , rr output lt6108 high side current sense amplifier with reference and comparator with shutdown 2.7v to 60v, 125v, resistor set gain, 1.25% threshold error lt1787/ lt1787hv precision, bidirectional high side current sense amplifier 2.7v to 60v operation, 75v offset, 60a current draw ltc6101/ ltc6101hv high voltage high side current sense amplifier 4v to 60v/5v to 100v operation, external resistor set gain, sot23 ltc6102/ ltc6102hv zero drift high side current sense amplifier 4v to 60v/5v to 100v operation, 10v offset, 1s step response, msop8/dfn packages ltc6104 bidirectional, high side current sense 4v to 60v, gain configurable, 8-pin msop package bidirectional full range current monitor C + v + v C v mon = 0v to 3v out v out = v ref + 24 ? (v sense ) v s = 5v (or 2v greater than v mon ) v ref = 1.25v ref Crefa Cin+in Crefb 19k 38k 190k 190k 190k 23.75k Crefc +refa +refb +refc 6375 ta06 19k 38k shdn 23.75k r sense 190k load note: operates over full range of load voltage downloaded from: http:///

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