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1 lt1813/LT1814 18134fa features applicatio s u descriptio u typical applicatio u dual/quad 3ma, 100mhz, 750v/ s operational amplifiers the lt 1813/LT1814 are dual and quad, low power, high speed, very high slew rate operational amplifiers with excellent dc performance. the lt1813/LT1814 feature reduced supply current, lower input offset voltage, lower input bias current and higher dc gain than other devices with comparable bandwidth. the circuit topology is a voltage feedback amplifier with the slewing characteris- tics of a current feedback amplifier. the output drives a 100 ? load to 3.5v with 5v supplies. on a single 5v supply, the output swings from 1.1v to 3.9v with a 100 ? load connected to 2.5v. the amplifiers are stable with a 1000pf capacitive load making them useful in buffer and cable driver applications. the lt1813/LT1814 are manufactured on linear technology? advanced low voltage complementary bipo- lar process. the lt1813 dual op amp is available in 8-pin msop, so and 3mm x 3mm low profile (0.8mm) dual fine pitch leadless packages (dfn). the quad LT1814 is available in 14-pin so and 16-pin ssop packages. a single version, the lt1812, is also available (see separate data sheet). 100mhz gain bandwidth product 750v/ s slew rate 3.6ma maximum supply current per amplifier tiny 3mm x 3mm x 0.8mm dfn package 8nv/ hz input noise voltage unity-gain stable 1.5mv maximum input offset voltage 4 a maximum input bias current 400na maximum input offset current 40ma minimum output current, v out = 3v 3.5v minimum input cmr, v s = 5v 30ns settling time to 0.1%, 5v step specified at 5v, single 5v supplies operating temperature range: 40 c to 85 c active filters wideband amplifiers buffers video amplification communication receivers cable drivers data acquisition systems bandpass filter with independently settable gain, q and f c filter frequency response , ltc and lt are registered trademarks of linear technology corporation. + 1/4 LT1814 r g r q r r1 r g r c c r1 r f r f r v in gain = + 1/4 LT1814 + + 1/4 LT1814 bandpass out 1/4 LT1814 1814 ta01 r1 r q q = 1 2 r f c f c = frequency (hz) output magnitude (6db/div) 0 1k 100k 1m 10m 1814 ta02 10k r = 499 ? r1 = 499 ? r f = 475 ? r q = 49.9 ? r g = 499 ? c = 3.3nf f c = 100khz q = 10 gain = 1 v s = 5v v in = 5v p-p distortion: 2nd < 76db 3rd < 90db across freq range
2 lt1813/LT1814 18134fa total supply voltage (v + to v ) lt1813/LT1814 ................................................ 12.6v lt1813hv ........................................................ 13.5v differential input voltage (transient only, note 2) .. 6v input voltage ............................................................ v s output short-circuit duration (note 3) ........... indefinite operating temperature range ................ 40 c to 85 c absolute axi u rati gs w ww u package/order i for atio uu w t jmax = 150 c, ja = 250 c/w consult ltc marketing for parts specified with wider operating temperature ranges. *see note 9. **the temperature grades are identified by a label on the shipping container. specified temperature range (note 8) .. 40 c to 85 c maximum junction temperature ......................... 150 c (dd package) ................................................... 125 c storage temperature range ................ 65 c to 150 c (dd package) ................................... 65 c to 125 c lead temperature (soldering, 10 sec)................. 300 c (note 1) order part number LT1814cs LT1814is 1 2 3 4 outa ?n a +in a v 8 7 6 5 v + out b ?n b +in b top view ms8 package 8-lead plastic msop t jmax = 150 c, ja = 110 c/w top view v + out b ?n b +in b out a ?n a +in a v s8 package 8-lead plastic so 1 2 3 4 8 7 6 5 b a top view s package 14-lead plastic so 1 2 3 4 5 6 7 14 13 12 11 10 9 8 out a ?n a +in a v + +in b ?n b out b out d ?n d +in d v +in c ?n c out c + + + + a b d c lt1813ds8* lt1813cs8 lt1813is8 lt1813hvds8* lt1813hvcs8 lt1813hvis8 order part number t jmax = 150 c, ja = 150 c/w lt1813dms8* ms8 part marking ltgz order part number s8 part marking 1813d 1813 1813i 813hvd 1813hv 813hvi top view gn package 16-lead plastic ssop 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 out a ?n a +in a v + +in b ?n b out b nc out d ?n d +in d v +in c ?n c out c nc + + + + a b d c t jmax = 150 c, ja = 135 c/w order part number gn part marking LT1814cgn LT1814ign 1814 1814i top view dd package 8-lead (3mm 3mm) plastic dfn underside metal internally connected to v 5 6 7 8 4 3 2 1 out a ?n a +in a v v + out b ?n b +in b b a t jmax = 125 c, ja = 160 c/w order part number dd part marking** lt1813ddd* lt1813cdd lt1813idd laaq
3 lt1813/LT1814 18134fa electrical characteristics the denotes the specifications which apply over the full operating temperature range, otherwise specifications are at t a = 25 c. v s = 5v, v cm = 0v, unless otherwise noted. (note 8) symbol parameter conditions min typ max units v os input offset voltage (note 4) 0.5 1.5 mv t a = 0 c to 70 c 2mv t a = 40 c to 85 c 3mv ? v os input offset voltage drift (note 7) t a = 0 c to 70 c 10 15 v/ c ? t t a = 40 c to 85 c 10 30 v/ c i os input offset current 50 400 na t a = 0 c to 70 c 500 na t a = 40 c to 85 c 600 na i b input bias current 0.9 4 a t a = 0 c to 70 c 5 a t a = 40 c to 85 c 6 a e n input noise voltage density f = 10khz 8 nv/ hz i n input noise current density f = 10khz 1 pa/ hz r in input resistance v cm = 3.5v 3 10 m ? differential 1.5 m ? c in input capacitance 2pf v cm input voltage range guaranteed by cmrr 3.5 4.2 v t a = ?0 c to 85 c 3.5 v cmrr common mode rejection ratio v cm = 3.5v 75 85 db t a = 0 c to 70 c 73 db t a = 40 c to 85 c 72 db minimum supply voltage guaranteed by psrr 1.25 2v t a = 40 c to 85 c 2v psrr power supply rejection ratio v s = 2v to 5.5v 78 97 db t a = 0 c to 70 c 76 db t a = 40 c to 85 c 75 db v s = 2v to 6.5v (lt1813hv) 75 97 db t a = 0 c to 70 c 73 db t a = 40 c to 85 c 72 db a vol large-signal voltage gain v out = 3v, r l = 500 ? 1.5 3 v/mv t a = 0 c to 70 c 1.0 v/mv t a = 40 c to 85 c 0.8 v/mv v out = 3v, r l = 100 ? 1.0 2.5 v/mv t a = 0 c to 70 c 0.7 v/mv t a = 40 c to 85 c 0.6 v/mv v out maximum output swing r l = 500 ? , 30mv overdrive 3.8 4v (positive/negative) t a = 0 c to 70 c 3.7 v t a = 40 c to 85 c 3.6 v r l = 100 ? , 30mv overdrive 3.35 3.5 v t a = 0 c to 70 c 3.25 v t a = 40 c to 85 c 3.15 v
4 lt1813/LT1814 18134fa electrical characteristics the denotes the specifications which apply over the full operating temperature range, otherwise specifications are at t a = 25 c. v s = 5v, v cm = 0v, unless otherwise noted. (note 8) symbol parameter conditions min typ max units i out maximum output current v out = 3v, 30mv overdrive 40 60 ma t a = 0 c to 70 c 35 ma t a = 40 c to 85 c 30 ma i sc output short-circuit current v out = 0v, 1v overdrive (note 3) 75 100 ma t a = 0 c to 70 c 60 ma t a = 40 c to 85 c 55 ma sr slew rate a v = ? (note 5) 500 750 v/ s t a = 0 c to 70 c 400 v/ s t a = 40 c to 85 c 350 v/ s fpbw full power bandwidth 6v p-p (note 6) 40 mhz gbw gain bandwidth product f = 200khz, r l = 500 ? 75 100 mhz t a = 0 c to 70 c 65 mhz t a = 40 c to 85 c 60 mhz 3db bw ?db bandwidth a v = 1, r l = 500 ? 200 mhz t r , t f rise time, fall time a v = 1, 10% to 90%, 0.1v, r l = 100 ? 2ns t pd propagation delay (note 10) a v = 1, 50% to 50%, 0.1v, r l = 100 ? 2.8 ns os overshoot a v = 1, 0.1v, r l = 100 ? 25 % t s settling time a v = 1, 0.1%, 5v 30 ns thd total harmonic distortion a v = 2, f = 1mhz, v out = 2v p-p , r l = 500 ? ?6 db dg differential gain a v = 2, v out = 2v p-p , r l = 150 ? 0.12 % dp differential phase a v = 2, v out = 2v p-p , r l = 150 ? 0.07 deg r out output resistance a v = 1, f = 1mhz 0.4 ? channel separation v out = 3v, r l = 100 ? 82 100 db t a = 0 c to 70 c 81 db t a = 40 c to 85 c 80 db i s supply current per amplifier 3 3.6 ma t a = 0 c to 70 c 4.5 ma t a = 40 c to 85 c 5.0 ma per amplifier,v s = 6.5v, (lt1813hv only) 4.0 ma t a = 0 c to 70 c 5.0 ma t a = 40 c to 85 c 5.5 ma
5 lt1813/LT1814 18134fa symbol parameter conditions min typ max units v os input offset voltage (note 4) 0.7 2.0 mv t a = 0 c to 70 c 2.5 mv t a = 40 c to 85 c 3.5 mv ? v os input offset voltage drift (note 7) t a = 0 c to 70 c 10 15 v/ c ? t t a = 40 c to 85 c 10 30 v/ c i os input offset current 50 400 na t a = 0 c to 70 c 500 na t a = 40 c to 85 c 600 na i b input bias current ? 4 a t a = 0 c to 70 c 5 a t a = 40 c to 85 c 6 a e n input noise voltage density f = 10khz 8 nv/ hz i n input noise current density f = 10khz 1 pa/ hz r in input resistance v cm = 3.5v 3 10 m ? differential 1.5 m ? c in input capacitance 2pf v cm input voltage range guaranteed by cmrr 3.5 4.2 v (positive) t a = ?0 c to 85 c 3.5 v input voltage range guaranteed by cmrr 0.8 1.5 v (negative) t a = ?0 c to 85 c 1.5 v cmrr common mode rejection ratio v cm = 1.5v to 3.5v 73 82 db t a = 0 c to 70 c 71 db t a = 40 c to 85 c 70 db minimum supply voltage guaranteed by psrr 2.5 4 v t a = 40 c to 85 c 4v a vol large-signal voltage gain v out = 1.5v to 3.5v, r l = 500 ? 1.0 2 v/mv t a = 0 c to 70 c 0.7 v/mv t a = 40 c to 85 c 0.6 v/mv v out = 1.5v to 3.5v, r l = 100 ? 0.7 1.5 v/mv t a = 0 c to 70 c 0.5 v/mv t a = 40 c to 85 c 0.4 v/mv v out maximum output swing r l = 500 ? , 30mv overdrive 3.9 4.1 v (positive) t a = 0 c to 70 c 3.8 v t a = 40 c to 85 c 3.7 v r l = 100 ? , 30mv overdrive 3.7 3.9 v t a = 0 c to 70 c 3.6 v t a = 40 c to 85 c 3.5 v maximum output swing r l = 500 ? , 30mv overdrive 0.9 1.1 v (negative) t a = 0 c to 70 c 1.2 v t a = 40 c to 85 c 1.3 v r l = 100 ? , 30mv overdrive 1.1 1.3 v t a = 0 c to 70 c 1.4 v t a = 40 c to 85 c 1.5 v electrical characteristics the denotes the specifications which apply over the full operating temperature range, otherwise specifications are at t a = 25 c. v s = 5v, v cm = 2.5v, r l to 2.5v, unless otherwise noted. (note 8)
6 lt1813/LT1814 18134fa electrical characteristics the denotes the specifications which apply over the full operating temperature range, otherwise specifications are at t a = 25 c. v s = 5v, v cm = 2.5v, r l to 2.5v, unless otherwise noted. (note 8) symbol parameter conditions min typ max units i out maximum output current v out = 1.5v or 3.5v, 30mv overdrive 25 35 ma t a = 0 c to 70 c 20 ma t a = 40 c to 85 c 17 ma i sc output short-circuit current v out = 2.5v, 1v overdrive (note 3) 55 75 ma t a = 0 c to 70 c 45 ma t a = 40 c to 85 c 40 ma sr slew rate a v = ? (note 5) 200 350 v/ s t a = 0 c to 70 c 150 v/ s t a = 40 c to 85 c 125 v/ s fpbw full power bandwidth 2v p-p (note 6) 55 mhz gbw gain bandwidth product f = 200khz, r l = 500 ? 65 94 mhz t a = 0 c to 70 c 55 mhz t a = 40 c to 85 c 50 mhz 3db bw ?db bandwidth a v = 1, r l = 500 ? 180 mhz t r , t f rise time, fall time a v = 1, 10% to 90%, 0.1v, r l = 100 ? 2.1 ns t pd propagation delay (note 10) a v = 1, 50% to 50%, 0.1v, r l = 100 ? 3ns os overshoot a v = 1, 0.1v, r l = 100 ? 25 % t s settling time a v = 1, 0.1%, 2v 30 ns thd total harmonic distortion a v = 2, f = 1mhz, v out = 2v p-p , r l = 500 ? ?5 db dg differential gain a v = 2, v out = 2v p-p , r l = 150 ? 0.22 % dp differential phase a v = 2, v out = 2v p-p , r l = 150 ? 0.21 deg r out output resistance a v = 1, f = 1mhz 0.45 ? channel separation v out = 1.5v to 3.5v, r l = 100 ? 81 100 db t a = 0 c to 70 c 80 db t a = 40 c to 85 c 79 db i s supply current per amplifier 2.9 4.0 ma t a = 0 c to 70 c 5.0 ma t a = 40 c to 85 c 5.5 ma note 1: absolute maximum ratings are those values beyond which the life of the device may be impaired. note 2: differential inputs of 6v are appropriate for transient operation only, such as during slewing. large sustained differential inputs can cause excessive power dissipation and may damage the part. note 3: a heat sink may be required to keep the junction temperature below absolute maximum when the output is shorted indefinitely. note 4: input offset voltage is pulse tested and is exclusive of warm-up drift. note 5: slew rate is measured between 2v at the output with 3v input for 5v supplies and 2v p-p at the output with a 3v p-p input for single 5v supplies. note 6: full power bandwidth is calculated from the slew rate: fpbw = sr/2 v p note 7: this parameter is not 100% tested note 8: the lt1813c/LT1814c are guaranteed to meet specified performance from 0 c to 70 c and is designed, characterized and expected to meet the extended temperature limits, but is not tested at ?0 c and 85 c. the lt1813i/LT1814i are guaranteed to meet the extended temperature limits. note 9: the lt1813d is 100% production tested at 25 c. it is designed, characterized and expected to meet the 0 c to 70 c specifications although it is not tested or qa sampled at these temperatures. the lt1813d is guaranteed functional from ?0 c to 85 c but may not meet those specifications. note 10: propagation delay is measured from the 50% point on the input waveform to the 50% point on the output waveform.
7 lt1813/LT1814 18134fa temperature ( c) ?0 25 0 supply current (ma) 2 5 0 50 75 1813/14 g01 1 4 3 25 100 125 per amplifier v s = 5v v s = 2.5v supply voltage ( v) 0 v input common mode range (v) 1.0 1.5 2.0 v + 2.0 1.5 2 4 5 1813/14 g02 0.5 1.0 0.5 1 3 6 7 t a = 25 c ? v os < 1mv input common mode voltage (v) 5.0 input bias current ( a) 1.0 0.5 t a = 25 c v s = 5v 5.0 1813/14 g03 1.5 2.0 2.5 0 2.5 0 temperature ( c) ?0 input bias current ( a) 0.8 0.7 0.6 25 75 1813/14 g04 0.9 1.0 ?5 0 50 100 125 1.1 1.2 v s = 5v frequency (hz) 10 100 1 10 i n 100 0.1 1 10 1k 10k 100k 1813/14 g05 t a = 25 c v s = 5v a v = 101 r s = 10k e n input voltage noise (nv/ hz) input current noise (pa/ hz) load resistance ( ? ) 100 60 open-loop gain (db) 62.5 65.0 67.5 70.0 75.0 1k 10k 1813/14 g06 72.5 t a = 25 c v s = 5v v s = 2.5v supply current vs temperature input common mode range vs supply voltage input bias current vs common mode voltage input bias current vs temperature input noise spectral density open-loop gain vs resistive load typical perfor a ce characteristics uw temperature ( c) ?0 open-loop gain (db) 70.0 72.5 75.0 25 75 1813/14 g07 67.5 65.0 ?5 0 50 100 125 62.5 60.0 v s = 5v v o = 3v r l = 500 ? r l = 100 ? supply voltage ( v) 0 v output voltage swing (v) 1.0 1.5 2.0 v + 2.0 1.5 2 4 5 1813/14 g02 0.5 1.0 0.5 1 3 6 7 t a = 25 c v in = 30mv r l = 100 ? r l = 100 ? r l = 500 ? r l = 500 ? output current (ma) ?0 output voltage swing (v) 2.0 1.0 1.5 v + 0.5 20 1813/14 g09 2.0 1.0 1.5 0.5 v ?0 ?0 0 40 60 v s = 5v v in = 30mv 85 c 25 c ?0 c open-loop gain vs temperature output voltage swing vs supply voltage output voltage swing vs load current
8 lt1813/LT1814 18134fa typical perfor a ce characteristics uw temperature ( c) ?0 80 output short-circuit current (ma) 90 100 110 120 25 0 25 50 1813/14 g10 75 100 125 v s = 5v source sink settling time (ns) 0 ? output step (v) ? ? ? 0 5 2 10 20 25 1813/14 g11 ? 3 4 1 5 15 30 35 v s = 5v a v = ? r f = 500 ? c f = 3pf 0.1% settling frequency (hz) 10k 100k 0.001 output impedance ( ? ) 0.1 100 1m 10m 100m 1813/14 g12 0.01 1 10 a v = 100 a v = 10 a v = 1 t a = 25 c v s = 5v frequency (hz) 10 gain (db) 20 40 60 70 10k 1m 10m 1000m 1813/14 g13 0 100k 100m 50 30 ?0 0 phase (deg) 20 60 100 120 ?0 80 40 ?0 phase gain 5v 5v 2.5v 2.5v t a = 25 c a v = 1 r f = r g = 500 ? frequency (hz) ?0 crosstalk (db) ?0 ?0 ?0 ?0 0 100k 10m 100m 1813/14 g14 ?0 1m 1000m ?0 ?0 ?0 t a = 25 c a v = 10 v in = 0dbm r l = 100 ? temperature ( c) ?0 25 gain bandwidth (mhz) phase margin (deg) 85 115 0 50 75 1813/14 g15 36 40 38 105 95 25 100 125 gbw v s = 5v gbw v s = 2.5v phase margin v s = 2.5v phase margin v s = 5v r l = 500 ? output short-circuit current vs temperature gain bandwidth and phase margin vs temperature crosstalk vs frequency gain and phase vs frequency output impedance vs frequency settling time vs output step frequency (hz) 1m ? voltage magnitude (db) ? ? 0 2 10m 100m 500m 1813/14 g16 ? ?0 ?2 ?4 4 6 t a = 25 c a v = 1 no r l v s = 2.5v v s = 5v frequency (hz) 1m 2 voltage magnitude (db) 4 6 8 10m 100m 500m 1813/14 g17 0 ? ? ? v s = 5v t a = 25 c a v = 2 r l = 100 ? v s = 2.5v frequency (hz) 1 0 voltage magnitude (db) 4 8 10m 100m 200m 1813/14 g18 ? ? 12 t a = 25 c a v = 1 v s = 5v r f = r g = 500 ? no r l c l = 1000pf c l = 500pf c l = 200pf c l = 100pf c l = 50pf c l = 0 frequency response vs capacitive load, a v = 1 frequency response vs supply voltage, a v = 2 frequency response vs supply voltage, a v = 1
9 lt1813/LT1814 18134fa typical perfor a ce characteristics uw supply voltage ( v) 0 gain bandwidth (mhz) phase margin (deg) 3 1813/14 g19 70 45 40 35 12 4 110 90 567 t a = 25 c gbw r l = 500 ? gbw r l = 100 ? phase margin r l = 100 ? phase margin r l = 500 ? frequency (hz) 1k 10k 100k 40 power supply rejection ratio (db) 60 80 1m 10m 100m 1813/14 g20 20 0 100 psrr +psrr t a = 25 c a v = 1 v s = 5v frequency (hz) 1k 10k 100k 40 common mode rejection ratio (db) 60 80 1m 10m 100m 1813/14 g21 20 0 100 t a = 25 c v s = 5v gain bandwidth and phase margin vs supply voltage power supply rejection ratio vs frequency common mode rejection ratio vs frequency slew rate vs supply voltage slew rate vs supply voltage slew rate vs input level supply voltage ( v) 0 0 slew rate (v/ s) 100 300 400 500 1000 700 2 4 5 1813/14 g22 200 800 900 600 1 3 6 7 t a =25 c a v = 1 v in = v s(total) /2 r f = r g = r l = 500 ? sr + sr supply voltage ( v) 0 200 slew rate (v/ s) 300 450 2 4 5 1813/14 g23 250 400 350 1 3 6 7 t a =25 c a v = 1 v in = 1v r f = r g = r l = 500 ? sr sr + input level (v p-p ) 0 200 slew rate (v/ s) 600 1200 2 4 5 1813/14 g24 400 1000 800 1 3 6 78 t a =25 c a v = 1 v s = 5v r f = r g = r l = 500 ? sr sr + slew rate vs temperature undistorted output swing vs frequency total harmonic distortion + noise vs frequency temperature ( c) ?0 200 slew rate (v/ s) 300 500 600 700 50 1100 1813/14 g25 400 0 125 100 25 ?5 75 800 900 1000 sr + v s = 5v sr + v s = 2.5v sr ? v s = 2.5v sr v s = 5v frequency (hz) 10 100 0.001 0.002 0.005 total harmonic distortion + noise (%) 0.01 1k 10k 100k 1813/14 g26 a v = 1 a v = 1 t a = 25 c v s = 5v v o = 2v p-p r l = 500 ? frequency (hz) 100k 5 output voltage (v p-p ) 6 7 8 9 1m 10m 100m 1813/14 g27 4 3 1 0 2 a v = 1 a v = 1 v s = 5v r l = 100 ? 2% max distortion
10 lt1813/LT1814 18134fa typical perfor a ce characteristics uw frequency (hz) 100k harmonic distortion (db) ?0 ?0 ?0 ?0 ?0 ?0 ?0 100 1m 10m 1813/14 g28 a v = 2 v s = 5v v o = 2v p-p 3rd harmonic r l = 500 ? 2nd harmonic r l = 500 ? 3rd harmonic r l = 100 ? 2nd harmonic r l = 100 ? total supply voltage (v) 4 differential phase (deg) differential gain (%) 0 0.5 0.2 8 10 1813/14 g29 0.3 0.4 0.1 0 0.5 0.2 0.3 0.4 0.1 6 12 differential gain r l = 150 ? differential phase r l = 150 ? differential phase r l = 1k differential gain r l = 1k capacitive load (pf) 10 40 overshoot (%) 50 60 70 80 100 1000 10000 1813/14 g30 30 20 10 0 90 100 t a = 25 c v s = 5v a v = 1 a v = 1 2nd and 3rd harmonic distortion vs frequency differential gain and phase vs supply voltage capacitive load handling small-signal transient (a v = 1) small-signal transient (a v = 1) small-signal transient (a v = 1, c l = 100pf) 1813/14 g31 1813/14 g32 1813/14 g33 large-signal transient (a v = 1) large-signal transient (a v = 1) large-signal transient (a v = 1, c l = 200pf) 1813/14 g34 1813/14 g35 1813/14 g36
11 lt1813/LT1814 18134fa layout and passive components the lt1813/LT1814 amplifiers are more tolerant of less than ideal board layouts than other high speed amplifiers. for optimum performance, a ground plane is recom- mended and trace lengths should be minimized, especially on the negative input lead. low esl/esr bypass capacitors should be placed directly at the positive and negative supply pins (0.01 f ceramics are recommended). for high drive current applications, additional 1 f to 10 f tantalums should be added. the parallel combination of the feedback resistor and gain setting resistor on the inverting input combine with the input capacitance to form a pole that can cause peaking or even oscillations. if feedback resistors greater than 1k are used, a parallel capacitor of value: c f > r g ?c in /r f should be used to cancel the input pole and optimize dynamic performance. for applications where the dc noise gain is 1 and a large feedback resistor is used, c f should be greater than or equal to c in . an example would be an i-to-v converter. input considerations the inputs of the lt1813/LT1814 amplifiers are con- nected to the base of an npn and pnp bipolar transistor in parallel. the base currents are of opposite polarity and provide first order bias current cancellation. due to variation in the matching of npn and pnp beta, the polarity of the input bias current can be positive or negative. the offset current, however, does not depend on beta match- ing and is tightly controlled. therefore, the use of balanced source resistance at each input is recommended for applications where dc accuracy must be maximized. for example, with a 100 ? source resistance at each input, the 400na maximum offset current results in only 40 v of extra offset, while without balance the 4 a maximum input bias current could result in a 0.4mv offset contribu- tion. the inputs can withstand differential input voltages of up to 6v without damage and without needing clamping or applicatio s i for atio wu uu series resistance for protection. this differential input voltage generates a large internal current (up to 40ma), which results in the high slew rate. in normal transient closed-loop operation, this does not increase power dis- sipation significantly because of the low duty cycle of the transient inputs. sustained differential inputs, however, will result in excessive power dissipation and therefore this device should not be used as a comparator. capacitive loading the lt1813/LT1814 are stable with capacitive loads from 0pf to 1000pf, which is outstanding for a 100mhz ampli- fier. the internal compensation circuitry accomplishes this by sensing the load induced output pole and adding compensation at the amplifier gain node as needed. as the capacitive load increases, both the bandwidth and phase margin decrease so there will be peaking in the frequency domain and ringing in the transient response. coaxial cable can be driven directly, but for best pulse fidelity a resistor of value equal to the characteristic impedance of the cable (e.g., 75 ? ) should be placed in series with the output. the receiving end of the cable should be termi- nated with the same value resistance to ground. slew rate the slew rate of the lt1813/LT1814 is proportional to the differential input voltage. highest slew rates are therefore seen in the lowest gain configurations. for example, a 5v output step in a gain of 10 has a 0.5v input step, whereas in unity gain there is a 5v input step. the lt1813/LT1814 is tested for a slew rate in a gain of 1. lower slew rates occur in higher gain configurations. power dissipation the lt1813/LT1814 combine two or four amplifiers with high speed and large output drive in a small package. it is possible to exceed the maximum junction temperature specification under certain conditions. maximum junction temperature (t j ) is calculated from the ambient tempera- ture (t a ) and power dissipation (p d ) as follows: t j = t a + (p d ? ja )
12 lt1813/LT1814 18134fa applicatio s i for atio wu uu complementary followers form an output stage that buff- ers the gain node from the load. the input resistor, input stage transconductance, and the capacitor on the high impedance node determine the bandwidth. the slew rate is determined by the current available to charge the gain node capacitance. this current is the differential input voltage divided by r1, so the slew rate is proportional to the input step. highest slew rates are therefore seen in the lowest gain configurations. the rc network across the output stage is bootstrapped when the amplifier is driving a light or moderate load and has no effect under normal operation. when a heavy load (capacitive or resistive) is driven, the network is incom- pletely bootstrapped and adds to the compensation at the high impedance node. the added capacitance moves the unity-gain frequency away from the pole formed by the output impedance and the capacitive load. the zero cre- ated by the rc combination adds phase to ensure that the total phase lag does not exceed 180 (zero phase margin), and the amplifier remains stable. in this way, the lt1813/ LT1814 are stable with up to 1000pf capacitive loads in unity gain, and even higher capacitive loads in higher closed-loop gain configurations. power dissipation is composed of two parts. the first is due to the quiescent supply current and the second is due to on-chip dissipation caused by the load current. the worst-case load induced power occurs when the output voltage is at 1/2 of either supply voltage (or the maximum swing if less than 1/2 the supply voltage). therefore p dmax is: p dmax = (v + ?v ) ?(i smax ) + (v + /2) 2 /r l or p dmax = (v + ?v ) ?(i smax ) + (v + ?v omax ) ?(v omax /r l ) example: LT1814s at 70 c, v s = 5v, r l =100 ? p dmax = (10v) ?(4.5ma) + (2.5v) 2 /100 ? = 108mw t jmax = 70 c + (4 ?108mw) ?(100 c/w) = 113 c circuit operation the lt1813/LT1814 circuit topology is a true voltage feedback amplifier that has the slewing behavior of a current feedback amplifier. the operation of the circuit can be understood by referring to the simplified schematic. complementary npn and pnp emitter followers buffer the inputs and drive an internal resistor. the input voltage appears across the resistor, generating current that is mirrored into the high impedance node. si plified sche atic ww (one amplifier) 1814 ss out +in ?n v + v r1 c c r c c
13 lt1813/LT1814 18134fa u typical applicatio frequency (mhz) 0.1 ?0 voltage gain (db) ?0 ?0 ?0 ?0 1 10 100 1813/14 ta02 ?0 ?0 ?0 ?0 0 10 v s = 5v v in = 600mv p-p peaking < 0.12db 4mhz, 4th order butterworth filter filter frequency response gain of 20 composite amplifier drives differential load with low distortion + 1/2 lt1813 220pf v in 665 ? 232 ? 47pf 232 ? + 1/2 lt1813 470pf 1813/14 ta01 v out 562 ? 274 ? 22pf 274 ? + + + + 1814 ta03 68pf 68pf load 800 ? 499 ? 499 ? 499 ? 499 ? 1k 9k 1k 10k v in gain = 20 3db bandwidth = 10mhz distortion = 77db at 2mhz, r l = 1k 1/4 LT1814 1/4 LT1814 1/4 LT1814 1/4 LT1814
14 lt1813/LT1814 18134fa u package descriptio msop (ms8) 0802 0.53 0.015 (.021 .006) seating plane 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 0.18 (.077) 0.254 (.010) 1.10 (.043) max 0.22 ?0.38 (.009 ?.015) typ 0.13 0.076 (.005 .003) 0.86 (.034) ref 0.65 (.0256) bsc 0 ?6 typ detail ? detail ? gauge plane 12 3 4 4.90 0.15 (1.93 .006) 8 7 6 5 3.00 0.102 (.118 .004) (note 3) 3.00 0.102 (.118 .004) note 4 0.52 (.206) ref 5.23 (.206) min 3.2 ?3.45 (.126 ?.136) 0.889 0.127 (.035 .005) recommended solder pad layout 0.42 0.04 (.0165 .0015) typ 0.65 (.0256) bsc 3.00 0.10 (4 sides) note: 1. drawing to be made a jedec package outline m0-229 variation of (weed-1) 2. all dimensions are in millimeters 3. 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 4. exposed pad shall be solder plated 0.38 0.10 bottom view?xposed pad 1.65 0.10 (2 sides) 0.75 0.05 r = 0.115 typ 2.38 0.10 (2 sides) 1 4 8 5 pin 1 top mark 0.200 ref 0.00 ?0.05 (dd8) dfn 0203 0.28 0.05 2.38 0.05 (2 sides) recommended solder pad pitch and dimensions 1.65 0.05 (2 sides) 2.15 0.05 0.50 bsc 0.675 0.05 3.5 0.05 package outline 0.28 0.05 0.50 bsc ms8 package 8-lead plastic msop (reference ltc dwg # 05-08-1660) dd package 8-lead plastic dfn (3mm 3mm) (reference ltc dwg # 05-08-1698)
15 lt1813/LT1814 18134fa u package descriptio s package 14-lead plastic small outline (narrow .150 inch) (reference ltc dwg # 05-08-1610) 1 n 2 3 4 .150 ?.157 (3.810 ?3.988) note 3 14 13 .337 ?.344 (8.560 ?8.738) note 3 .228 ?.244 (5.791 ?6.197) 12 11 10 9 5 6 7 n/2 8 .016 ?.050 (0.406 ?1.270) .010 ?.020 (0.254 ?0.508) 45 0 ?8 typ .008 ?.010 (0.203 ?0.254) s14 0502 .053 ?.069 (1.346 ?1.752) .014 ?.019 (0.355 ?0.483) typ .004 ?.010 (0.101 ?0.254) .050 (1.270) bsc .245 min n 123 n/2 .160 .005 recommended solder pad layout .045 .005 .050 bsc .030 .005 typ inches (millimeters) note: 1. dimensions in 2. drawing not to scale 3. these dimensions do not include mold flash or protrusions. mold flash or protrusions shall not exceed .006" (0.15mm) 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 represen- tation that the interconnection of its circuits as described herein will not infringe on existing patent rights. .016 ?.050 (0.406 ?1.270) .010 ?.020 (0.254 ?0.508) 45 0 ?8 typ .008 ?.010 (0.203 ?0.254) so8 0303 .053 ?.069 (1.346 ?1.752) .014 ?.019 (0.355 ?0.483) typ .004 ?.010 (0.101 ?0.254) .050 (1.270) bsc 1 2 3 4 .150 ?.157 (3.810 ?3.988) note 3 8 7 6 5 .189 ?.197 (4.801 ?5.004) note 3 .228 ?.244 (5.791 ?6.197) .245 min .160 .005 recommended solder pad layout .045 .005 .050 bsc .030 .005 typ inches (millimeters) note: 1. dimensions in 2. drawing not to scale 3. these dimensions do not include mold flash or protrusions. mold flash or protrusions shall not exceed .006" (0.15mm) s8 package 8-lead plastic small outline (narrow .150 inch) (reference ltc dwg # 05-08-1610)
16 lt1813/LT1814 18134fa ? linear technology corporation 2001 lt/tp 0503 1k rev a ? printed in the usa linear technology corporation 1630 mccarthy blvd., milpitas, ca 95035-7417 (408) 432-1900 fax: (408) 434-0507 www.linear.com related parts part number description comments lt1363/lt1364/lt1365 single/dual/quad 70mhz, 1000v/ s, c-load tm op amps 2.5v to 15v operation lt1395/lt1396/lt1397 single/dual/quad 400mhz current feedback amplifiers 4.6ma supply current, 800v/ s, 80ma output current lt1806/lt1807 single/dual 325mhz, 140v/ s rail-to-rail i/o op amps low noise 3.5nv/ hz lt1809/lt1810 single/dual 180mhz, 350v/ s rail-to-rail i/o op amps low distortion ?0dbc at 5mhz lt1812 single 3ma, 100mhz, 750v/ s op amp single version of lt1813/LT1814; 50 a shutdown option lt1815/lt1816/lt1817 single/dual/quad 220mhz, 1500v/ s op amps 6.5ma supply current, 6nv/ hz input noise c-load is a trademark of linear technology corporation. u typical applicatio 1813/14 ta03 v in trim r5 for gain trim r1 for common mode rejection bw = 1mhz r1 10k r2 1k r5 220 ? r4 10k r3 1k v out + + + 1/2 lt1813 1/2 lt1813 two op amp instrumentation amplifier gn package 16-lead plastic ssop (narrow .150 inch) (reference ltc dwg # 05-08-1641) u package descriptio gn16 (ssop) 0502 12 3 4 5 6 7 8 .229 ?.244 (5.817 ?6.198) .150 ?.157** (3.810 ?3.988) 16 15 14 13 .189 ?.196* (4.801 ?4.978) 12 11 10 9 .016 ?.050 (0.406 ?1.270) .015 .004 (0.38 0.10) 45 0 ?8 typ .007 ?.0098 (0.178 ?0.249) .053 ?.068 (1.351 ?1.727) .008 ?.012 (0.203 ?0.305) .004 ?.0098 (0.102 ?0.249) .0250 (0.635) bsc .009 (0.229) ref .254 min recommended solder pad layout .150 ?.165 .0250 typ .0165 .0015 .045 .005 *dimension does not include mold flash. mold flash shall not exceed 0.006" (0.152mm) per side **dimension does not include interlead flash. interlead flash shall not exceed 0.010" (0.254mm) per side inches (millimeters) note: 1. controlling dimension: inches 2. dimensions are in 3. drawing not to scale gain r r r r r r rr r = ? ? ? ? ? ? + ? ? ? ? ? ? + ? ? ? ? ? ? + + () ? ? ? ? ? ? ? ? = 4 3 1 1 2 2 1 3 4 23 5 102

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