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lt1395/lt1396/lt1397 1 139567fd typical application description single/dual/quad 400mhz current feedback ampli er the lt ? 1395/lt1396/lt1397 are single/dual/quad 400mhz current feedback ampli? ers with an 800v/s slew rate and the ability to drive up to 80ma of output current. the lt1395/lt1396/lt1397 operate on all supplies from a single 4v to 6v. at 5v, they draw 4.6ma of supply cur- rent per ampli? er. the lt1395cs6 also adds a shutdown pin. when disabled, the lt1395cs6 draws virtually zero supply current and its output becomes high impedance. the lt1395cs6 will turn on in only 30ns and turn off in 40ns, making it ideal in spread spectrum and portable equipment applications. for space limited applications, the lt1395 is available in tsot-23 packages, the lt1396 is available in a tiny 3mm 3mm 0.75mm dual ? ne pitch leadless dfn package, and the lt1397 is available in a tiny 4mm 3mm 0.75mm dfn package. the lt1395/lt1396/lt1397 are manufactured on linear technologys proprietary complementary bipolar process. they have standard single/dual/quad pinouts and they are optimized for use on supply voltages of 5v. unity-gain video loop-through ampli? er features applications n 400mhz bandwidth on 5v (a v = 1) n 350mhz bandwidth on 5v (a v = 2, C1) n 0.1db gain flatness: 100mhz (a v = 1, 2 and C1) n high slew rate: 800v/s n wide supply range: 2v(4v) to 6v(12v) n 80ma output current n low supply current: 4.6ma/ampli? er n lt1395: so-8, tsot23-5 and tsot23-6 packages lt1396: so-8, msop and tiny 3mm 3mm 0.75mm dfn-8 packages lt1397: so-14, ssop-16 and tiny 4mm 3mm 0.75mm dfn-14 packages n low pro? le (1mm) thinsot? package n cable drivers n video ampli? ers n mux ampli? ers n high speed portable equipment n if ampli? ers C + v out 1395/6/7 ta01 12.1k 0.67pf r f2 255 1% resistors for a gain of g: v out = g (v in + C v in C ) r f1 = r f2 r g1 = (5g C 1) r f2 r g2 = trim cmrr with r g1 high input resistance does not load cable even when power is off 1/2 lt1396 r f2 (5g C 1) r g2 63.4 r f1 255 r g1 1.02k C + 1/2 lt1396 3.01k 3.01k 12.1k v in C v in + bnc inputs 0.67pf frequency (hz) 100 C60 gain (db) C50 C40 C30 C20 C10 10 1k 10k 100k 1g 1395/6/7 ta02 1m 10m 100m 0 common mode signal normal signal loop-through ampli? er frequency response l , lt, ltc, ltm, linear technology and the linear logo are registered trademarks of linear technology corporation. all other trademarks are the property of their respective owners.
lt1395/lt1396/lt1397 2 139567fd (note 1) absolute maximum ratings total supply voltage (v + to v C ) .............................12.6v input current (note 2) ......................................... 10ma output current .................................................. 100ma differential input voltage (note 2).............................5v output short-circuit duration (note 3) ........ continuous operating temperature range (note 4) lt1395c/lt1396c/lt1397c ................ C40c to 85c lt1397h ........................................... C40c to 125c pin configuration speci? ed temperature range (note 5) lt1395c/lt1396c/lt1397c .................... 0c to 70c lt1397h ........................................... C40c to 125c storage temperature range .................. C65c to 150c storage temperature range (dd package) .................................... C65c to 125c junction temperature (note 6) 150c junction temperature (dd package) (note 6) ..... 125c lead temperature (soldering, 10 sec) ................. 300c top view dd package 8-lead (3mm 3mm) plastic dfn 5 6 7 8 4 3 2 1 out a Cin a +in a v C v + out b Cin b +in b t jmax = 150c, ja = 160c/w (note 3) underside metal connected to v C (pcb connection optional) 1 2 3 4 5 6 7 14 13 12 11 10 9 8 out d Cin d +in d v C +in c Cin c out c out a Cin a +in a v + +in b Cin b out b top view de14 package 14-lead (4mm 3mm) plastic dfn 1 2 3 4 out a Cin a +in a v C 8 7 6 5 v + out b Cin b +in b top view ms8 package 8-lead plastic msop + C + C top view s package 14-lead plastic so 1 2 3 4 5 6 7 14 13 12 11 10 9 8 out a Cin a +in a v + +in b Cin b out b out d Cin d +in d v C +in c Cin c out c + C + C C + C + 1 2 3 4 5 6 7 8 top view gn package 16-lead plastic ssop 16 15 14 13 12 11 10 9 out a Cin a +in a v + +in b Cin b out b nc out d Cin d +in d v C +in c Cin c out c nc + C + C C + C + v C 2 5 v + 4 Cin out 1 top view s5 package 5-lead plastic tsot-23 +in 3 + C t jmax = 150c, ja = 43c/w, jc = 4.3c/w exposed pad (pin 15) is v C must be soldered to pcb t jmax = 150c, ja = 135c/w t jmax = 150c, ja = 250c/w t jmax = 150c, ja = 100c/w t jmax = 150c, ja = 250c/w
lt1395/lt1396/lt1397 3 139567fd pin configuration order information lead free finish tape and reel part marking* package description specified temperature range lt1396cdd#pbf lt1396cdd#trpbf labd 8-lead (3mm 3mm) plastic dfn 0c to 70c lt1397cde#pbf lt1397cde#trpbf 1397 14-lead (4mm 3mm) plastic dfn 0c to 70c lt1397hde#pbf lt1397hde#trpbf 1397 14-lead (4mm 3mm) plastic dfn ?40c to 125c lt1397cgn#pbf lt1397cgn#trpbf 1397 16-lead plastic ssop 0c to 70c lt1396cms8#pbf lt1396cms8#trpbf ltdy 8-lead plastic msop 0c to 70c lt1397cs#pbf lt1397cs#trpbf 1397cs 14-lead plastic so 0c to 70c lt1395cs5#pbf lt1395cs5#trpbf ltma 5-lead plastic tsot-23 0c to 70c lt1395cs6#pbf lt1395cs6#trpbf ltmf 6-lead plastic tsot-23 0c to 70c lt1395cs8#pbf lt1395cs8#t rpbf 1395 8-lead plastic so 0c to 70c lt1396cs8#pbf lt1396cs8#trpbf 1396 8-lead plastic so 0c to 70c lead based finish tape and reel part marking* package description specified temperature range lt1396cdd lt1396cdd#tr labd 8-lead (3mm 3mm) plastic dfn 0c to 70c lt1397cde lt1397cde#tr 1397 14-lead (4mm 3mm) plastic dfn 0c to 70c lt1397hde lt1397hde#tr 1397 14-lead (4mm 3mm) plastic dfn ?40c to 125c lt1397cgn lt1397cgn#tr 1397 16-lead plastic ssop 0c to 70c lt1396cms8 lt1396cms8#tr ltdy 8-lead plastic msop 0c to 70c lt1397cs lt1397cs#tr 1397cs 14-lead plastic so 0c to 70c lt1395cs5 lt1395cs5#tr ltma 5-lead plastic tsot-23 0c to 70c lt1395cs6 lt1395cs6#tr ltmf 6-lead plastic tsot-23 0c to 70c lt1395cs8 lt1395cs8#tr 1395 8-lead plastic so 0c to 70c lt1396cs8 lt1396cs8#tr 1396 8-lead plastic so 0c to 70c consult ltc marketing for parts speci? ed with wider operating temperature ranges. c onsult ltc marketing for information on nonstandard lead based ? nish parts. *temperature grades are identi? ed 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 speci? cations, go to: http://www.linear.com/tapeandreel/ out 1 v ? 2 +in 3 6 v + 5 en 4 ?in top view s6 package 6-lead plastic tsot-23 + ? 1 2 3 4 8 7 6 5 top view nc v + out nc nc ?in +in v ? s8 package (1395) 8-lead plastic so + ? 1 2 3 4 8 7 6 5 top view v + out b ?in b +in b out a ?in a +in a v ? s8 package (1396) 8-lead plastic so + ? + ? t jmax = 150c, ja = 230c/w t jmax = 150c, ja = 150c/w t jmax = 150c, ja = 150c/w
lt1395/lt1396/lt1397 4 139567fd electrical characteristics symbol parameter conditions min typ max units v os input offset voltage 110 12 mv mv v os / t input offset voltage drift 15 v/c i in + noninverting input current 10 25 30 a a i in C inverting input current 10 50 60 a a e n input noise voltage density f = 1khz, r f = 1k, r g = 10, r s = 0 4.5 nv/ hz +i n noninverting input noise current density f = 1khz 6 pa/ hz Ci n inverting input noise current density f = 1khz 25 pa/ hz r in input resistance v in = 3.5v 0.3 1 m c in input capacitance 2.0 pf v inh input voltage range, high v s = 5v v s = 5v, 0v 3.5 4.0 4.0 v v v inl input voltage range, low v s = 5v v s = 5v, 0v C4.0 1.0 C 3.5 v v v outh output voltage swing, high v s = 5v v s = 5v v s = 5v, 0v 3.9 3.7 4.2 4.2 v v v v outl output voltage swing, low v s = 5v v s = 5v v s = 5v, 0v C4.2 0.8 C3.9 C3.7 v v v v outh output voltage swing, high v s = 5v, r l = 150 v s = 5v, r l = 150 v s = 5v, 0v; r l = 150 3.4 3.2 3.6 3.6 v v v v outl output voltage swing, low v s = 5v, r l = 150 v s = 5v, r l = 150 v s = 5v, 0v; r l = 150 C3.6 0.6 C3.4 C3.2 v v v cmrr common mode rejection ratio v cm = 3.5v 42 52 db Ci cmrr inverting input current common mode rejection v cm = 3.5v v cm = 3.5v 10 16 22 a/v a/v psrr power supply rejection ratio v s = 2v to 5v 56 70 db +i psrr noninverting input current power supply rejection v s = 2v to 5v 12 3 a/v a/v Ci psrr inverting input current power supply rejection v s = 2v to 5v 27 a/v a v large-signal voltage gain v out = 2v, r l = 150 50 65 db r ol transimpedance, v out /i in C v out = 2v, r l = 150 40 100 k i out maximum output current r l = 0 80 ma i s supply current per ampli? er v out = 0v 4.6 6.5 ma disable supply current en pin voltage = 4.5v, r l = 150 (lt1395cs6 only) 0.1 100 a i en enable pin current (lt1395cs6 only) 30 110 200 a a sr slew rate (note 7) a v = C 1, r l = 150 500 800 v/s the denotes speci? cations which apply over the speci? ed operating temperature range, otherwise speci? cations are at t a = 25c. for each ampli? er: v cm = 0v, v s = 5v, en = 0.5v, pulse tested, unless otherwise noted. (note 5)
lt1395/lt1396/lt1397 5 139567fd electrical characteristics 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: this parameter is guaranteed to meet speci? ed performance through design and characterization. it has not been tested. note 3: a heat sink may be required depending on the power supply voltage and how many ampli? ers have their outputs short circuited. the ja speci? ed for the dd package is with minimal pcb heat spreading metal. using expanded metal area on all layers of a board reduces this value. note 4: the lt1395c/lt1396c/lt1397c are guaranteed functional over the operating temperature range of C40c to 85c. the lt1397h is guaranteed functional over the operating temperature range of C40c to 125c. note 5: the lt1395c/lt1396c/lt1397c are guaranteed to meet speci? ed performance from 0c to 70c. the lt1395c/lt1396c/lt1397c are designed, characterized and expected to meet speci? ed performance from C40c and 85c but are not tested or qa sampled at these temperatures. the lt1397h is guaranteed to meet speci? ed performance from C40c to 125c. for guaranteed i-grade parts, consult the factory. symbol parameter conditions min typ max units t on turn-on delay time (note 9) r f = r g = 255, r l = 100, (lt1395cs6 only) 30 75 ns t off turn-off delay time (note 9) r f = r g = 255, r l = 100, (lt1395cs6 only) 40 100 ns C3db bw C3db bandwidth a v = 1, r f = 374, r l = 100 a v = 2, r f = r g = 255, r l = 100 400 350 mhz mhz 0.1db bw 0.1db bandwidth a v = 1, r f = 374, r l = 100 a v = 2, r f = r g = 255, r l = 100 100 100 mhz mhz t r , t f small-signal rise and fall time r f = r g = 255, r l = 100, v out = 1v p-p 1.3 ns t pd propagation delay r f = r g = 255, r l = 100, v out = 1v p-p 2.5 ns os small-signal overshoot r f = r g = 255, r l = 100, v out = 1v p-p 10 % t s settling time 0.1%, a v = C1, r f = r g = 280, r l = 150 25 ns dg differential gain (note 8) r f = r g = 255, r l = 150 0.02 % dp differential phase (note 8) r f = r g = 255, r l = 150 0.04 deg note 6: t j is calculated from the ambient temperature t a and the power dissipation p d according to the following formula: lt1395cs5: t j = t a + (p d ? 250c/w) lt1396cs6: t j = t a + (p d ? 230c/w) lt1395cs8: t j = t a + (p d ? 150c/w) lt1396cs8: t j = t a + (p d ? 150c/w) lt1396cms8: t j = t a + (p d ? 250c/w) lt1396cdd: t j = t a + (p d ? 160c/w) lt1397cs14: t j = t a + (p d ? 100c/w) lt1397cgn16: t j = t a + (p d ? 135c/w) lt1397cde: t j = t a + (p d ? 43c/w) lt1397hde: t j = t a + (p d ? 43c/w) note 7: slew rate is measured at 2v on a 3v output signal. note 8: differential gain and phase are measured using a tektronix tsg120yc/ntsc signal generator and a tektronix 1780r video measurement set. the resolution of this equipment is 0.1% and 0.1. ten identical ampli? er stages were cascaded giving an effective resolution of 0.01% and 0.01. note 9: for lt1395cs6, turn-on delay time (t on ) is measured from control input to appearance of 1v(50%) at the output, for v in = 1v and a v = 2. likewise, turn-off delay time (t off ) is measured from control input to appearance of 1v(50%) on the output for v in = 1v and a v = 2. this speci? cation is guaranteed by design and characterization. the denotes speci? cations which apply over the speci? ed operating temperature range, otherwise speci? cations are at t a = 25c. for each ampli? er: v cm = 0v, v s = 5v, pulse tested, unless otherwise noted. (note 5)
lt1395/lt1396/lt1397 6 139567fd typical ac performance 0 C2 C4 gain (db) C6 1m 10m 100m 1g v s = 5v v in = C10dbm r f = 374 r l = 100 frequency (hz) 1395/6/7 g01 output (1v/div) v s = 5v v in = 2.5v r f = 374 r l = 100 time (10ns/div) 1395/6/7 g04 closed-loop gain vs frequency (a v = 1) large-signal transient response (a v = 1) 6 4 2 gain (db) 0 1m 10m 100m 1g v s = 5v v in = C10dbm r f = r g = 255 r l = 100 frequency (hz) 1395/6/7 g02 output (1v/div) v s = 5v v in = 1.25v r f = r g = 255 r l = 100 1395/6/7 g05 time (10ns/div) closed-loop gain vs frequency (a v = 2) large-signal transient response (a v = 2) 0 C2 C4 gain (db) C6 1m 10m 100m 1g v s = 5v v in = C10dbm r f = r g = 280 r l = 100 frequency (hz) 1395/6/7 g03 output (1v/div) v s = 5v v in = 2.5v r f = r g = 280 r l = 100 1395/6/7 g06 time (10ns/div) closed-loop gain vs frequency (a v = C 1) large-signal transient response (a v = C 1) v s (v) a v r l () r f () r g () small signal C 3db bw (mhz) small signal 0.1db bw (mhz) small signal peaking (db) 5 1 100 374 C 400 100 0.1 5 2 100 255 255 350 100 0.1 5 C1 100 280 280 350 100 0.1 5 3 500 221 110 300 100 0.1 5 5 500 100 24.9 210 50 0.0 5 10 500 90.9 10 65 10 0.0 5 10 500 90.9 10||100pf 100 50 0.1 typical performance characteristics
lt1395/lt1396/lt1397 7 139567fd typical performance characteristics frequency (hz) 90 distortion (db) 80 60 40 30 1k 100k 1m 100m 1395/6/7 g07 100 10k 10m 50 70 110 hd2 hd3 t a = 25c r f = r g = 255w r l = 100 v s = 5v v out = 2vpp frequency (hz) 1m 2 output voltage (v p-p ) 3 4 5 6 8 10m 100m 1395/6/7 g08 7 a v = +1 a v = +2 t a = 25c r f = 374 (a v = 1) r f = r g = 255 (a v = 2) r l = 100 v s = 5v frequency (hz) 20 psrr (db) 40 50 70 80 10k 1m 10m 100m 1395/6/7 g09 0 100k 60 30 10 +psrr Cpsrr t a = 25c r f = r g = 255 r l = 100 a v = +2 frequency (hz) 10 input noise (nv/hz or pa/hz) 10 100 1000 30 100 300 1k 3k 10k 30k 100k 1395/6/7 g10 1 Ci n +i n e n frequency (hz) 10k 0.01 output impedance () 1 100 1m 10m 100k 100m 1395/6/7 g11 0.1 10 r f = r g = 255 r l = 50 a v = +2 v s = 5v frequency (hz) 100k 100 output impedance (disabled) () 1k 10k 100k 1m 10m 100m 1395/6/7 g12 r f = 374 a v = +1 v s = 5v feedback resistance () 300 1 capacitive load (pf) 10 100 1000 900 1500 2100 2700 3300 1395/6/7 g13 r f = r g a v = +2 v s = 5v peaking 5db capacitive load (pf) 10 0 output series resistance () 10 20 40 100 1000 1395/6/7 g14 30 r f = r g = 255 v s = 5v overshoot < 2% supply voltage (v) 0 0 supply current (ma) 1 3 4 5 2 4 59 1395/6/7 g15 2 13 6 7 8 6 en = v C en = 0v, all non-disable devices input voltage noise and current noise vs frequency output impedance vs frequency lt1395cs6 output impedance (disabled) vs frequency maximum capacitive load vs feedback resistor capacitive load vs output series resistor supply current vs supply voltage 2nd and 3rd harmonic distortion vs frequency maximum undistorted output voltage vs frequency psrr vs frequency
lt1395/lt1396/lt1397 8 139567fd typical performance characteristics ambient temperature (c) C50 C5 output voltage swing (v) C4 C2 C1 0 5 2 0 50 75 1395/6/7 g16 C3 3 4 1 C25 25 100 125 r l = 150 r l = 100k r l = 150 r l = 100k v s = 5v ambient temperature (c) C50 C40 C30 C10 25 75 1395/6/7 g17 C50 C60 C25 0 50 100 125 C70 C80 C20 enable pin current (a) v s = 5v en = 0v en = C5v ambient temperature ( c ) C50 positive supply current per amplifier (ma) 4.75 25 4.00 3.50 C25 0 50 3.25 3.00 5.00 4.50 4.25 3.75 75 100 125 en = C5v en = 0v, all non-disable devices v s = 5v ambient temperature (c) C50 input offset voltage (mv) 2.5 25 1395/6/7 g19 1.0 0 C25 0 50 C0.5 C1.0 3.0 2.0 1.5 0.5 75 100 125 v s = 5v ambient temperature (c) C50 6 9 i b + i b C 15 25 75 1395/6/7 g20 3 0 C25 0 50 100 125 12 input bias current (a) v s = 5v input offset voltage vs temperature input bias currents vs temperature output (200mv/div) r l = 100 r f = r g = 255 f = 10mhz time (10ns/div) 1395/6/7 g21 square wave response input (100mv/div) output (200mv/div) a v = +2 r l = 100 r f = r g = 255 time (500ps/div) t pd = 2.5ns 1395/6/7 g22 propagation delay vout (200mv/div) a v = +2 r l = 100 r f = r g = 255 time (500ps/div) os = 10% t r = 1.3ns 1395/6/7 g23 rise time and overshoot output voltage swing vs temperature lt1395cs6 enable pin current vs temperature positive supply current per ampli? er vs temperature
lt1395/lt1396/lt1397 9 139567fd pin functions lt1395cs5 out (pin 1): output. v C (pin 2): negative supply voltage, usually C5v. +in (pin 3): noninverting input. C in (pin 4): inverting input. v + (pin 5): positive supply voltage, usually 5v. lt1395cs6 out (pin 1): output. v C (pin 2): negative supply voltage, usually C5v. + in (pin 3): noninverting input. C in (pin 4): inverting input. en (pin 5): enable pin. logic low to enable. v + (pin 6): positive supply voltage, usually 5v. lt1395cs8 nc (pin 1): no connection. C in (pin 2): inverting input. + in (pin 3): noninverting input. v C (pin 4): negative supply voltage, usually C5v. nc (pin 5): no connection. out (pin 6): output. v+ (pin 7): positive supply voltage, usually 5v. nc (pin 8): no connection. lt1396cms8, lt1396cs8, lt1396cdd out a (pin 1): a channel output. C in a (pin 2): inverting input of a channel ampli? er. + in a (pin 3): noninverting input of a channel ampli? er. v C (pin 4): negative supply voltage, usually C5v. + in b (pin 5): noninverting input of b channel ampli? er. C in b (pin 6): inverting input of b channel ampli? er. out b (pin 7): b channel output. v + (pin 8): positive supply voltage, usually 5v. lt1397cs, lt1397cde, lt1397hde out a (pin 1): a channel output. C in a (pin 2): inverting input of a channel ampli? er. + in a (pin 3): noninverting input of a channel ampli? er. v + (pin 4): positive supply voltage, usually 5v. + in b (pin 5): noninverting input of b channel ampli? er. C in b (pin 6): inverting input of b channel ampli? er. out b (pin 7): b channel output. out c (pin 8): c channel output. C in c (pin 9): inverting input of c channel ampli? er. +in c (pin 10): noninverting input of c channel ampli? er. v C (pin 11): negative supply voltage, usually C5v. +in d (pin 12): noninverting input of d channel ampli? er. C in d (pin 13): inverting input of d channel ampli? er. out d (pin 14): d channel output. lt1397cgn out a (pin 1): a channel output. C in a (pin 2): inverting input of a channel ampli? er. + in a (pin 3): noninverting input of a channel ampli? er. v + (pin 4): positive supply voltage, usually 5v. + in b (pin 5): noninverting input of b channel ampli? er. C in b (pin 6): inverting input of b channel ampli? er. out b (pin 7): b channel output. nc (pin 8): no connection. nc (pin 9): no connection. out c (pin 10): c channel output. C in c (pin 11): inverting input of c channel ampli? er. +in c (pin 12): noninverting input of c channel ampli? er. v C (pin 13): negative supply voltage, usually C5v. +in d (pin 14): noninverting input of d channel ampli? er. C in d (pin 15): inverting input of d channel ampli? er. out d (pin 16): d channel output.
lt1395/lt1396/lt1397 10 139567fd feedback resistor selection the small-signal bandwidth of the lt1395/lt1396/lt1397 is set by the external feedback resistors and the inter- nal junction capacitors. as a result, the bandwidth is a function of the supply voltage, the value of the feedback resistor, the closed-loop gain and the load resistor. the lt1395/lt1396/lt1397 have been optimized for 5v supply operation and have a C3db bandwidth of 400mhz at a gain of 1 and 350mhz at a gain of 2. please refer to the resistor selection guide in the typical ac perfor- mance table. capacitance on the inverting input current feedback ampli? ers require resistive feedback from the output to the inverting input for stable operation. take care to minimize the stray capacitance between the output and the inverting input. capacitance on the inverting input to ground will cause peaking in the frequency response (and overshoot in the transient response). capacitive loads the lt1395/lt1396/lt1397 can drive many capacitive loads directly when the proper value of feedback resistor is used. the required value for the feedback resistor will increase as load capacitance increases and as closed- loop gain decreases. alternatively, a small resistor (5 to 35) can be put in series with the output to isolate the capacitive load from the ampli? er output. this has the advantage that the ampli? er bandwidth is only reduced when the capacitive load is present. the disadvantage is that the gain is a function of the load resistance. see the typical performance characteristics curves. power supplies the lt1395/lt1396/lt1397 will operate from single or split supplies from 2v (4v total) to 6v (12v total). it is not necessary to use equal value split supplies, however the offset voltage and inverting input bias current will change. the offset voltage changes about 2.5mv per volt of supply mismatch. the inverting bias current will typically change about 10a per volt of supply mismatch. applications information figure 1. + i s vs (v + C v en ) v + C v en (v) 0 0 +i s (ma) 0.5 1.5 2.0 2.5 5.0 3.5 2 4 5 1395/6/7 f01 1.0 4.0 4.5 3.0 1 3 6 7 t a = 25c v + = 5v v C = C5v v C = 0v slew rate unlike a traditional voltage feedback op amp, the slew rate of a current feedback ampli? er is not independent of the ampli? er gain con? guration. in a current feedback ampli- ? er, both the input stage and the output stage have slew rate limitations. in the inverting mode, and for gains of 2 or more in the noninverting mode, the signal amplitude between the input pins is small and the overall slew rate is that of the output stage. for gains less than 2 in the noninverting mode, the overall slew rate is limited by the input stage. the input slew rate of the lt1395/lt1396/lt1397 is ap- proximately 600v/s and is set by internal currents and capacitances. the output slew rate is set by the value of the feedback resistor and internal capacitance. at a gain of 2 with 255 feedback and gain resistors and 5v supplies, the output slew rate is typically 800v/s. larger feedback resistors will reduce the slew rate as will lower supply voltages. enable/disable the lt1395cs6 has a unique high impedance, zero sup- ply current mode which is controlled by the en pin. the lt1395cs6 is designed to operate with cmos logic; it draws virtually zero current when the en pin is high. to activate the ampli? er, its en pin is normally pulled to a logic low. however, supply current will vary as the volt- age between the v + supply and en is varied. as seen in figure 1, +i s does vary with (v + C v en ), particularly when the voltage difference is less than 3v. for normal
lt1395/lt1396/lt1397 11 139567fd operation, it is important to keep the en pin at least 3v below the v + supply. if a v + of less than 3v is desired, and the ampli? er will remain enabled at all times, then the en pin should be tied to the v C supply. the enable pin current is approximately 30a when activated. if using cmos open-drain logic, an external 1k pull-up resistor is recommended to ensure that the lt1395cs6 remains disabled in spite of any cmos drain leakage currents. the enable/disable times are very fast when driven from standard 5v cmos logic. the lt1395cs6 enables in about 30ns (50% point to 50% point) while operating on 5v supplies (figure 2). likewise, the disable time is approxi- mately 40ns (50% point to 50% point) (figure 3). applications information figure 4. buffered rgb to color-difference matrix C + a2 1/4 lt1397 C + a3 1/4 lt1397 C + a1 1/4 lt1397 r7 255 r6 127 r5 255 r10 2320 r9 432 r11 82.5 r g b r12 90.9 r13 76.8 all resistors 1% v s = 5v r8 845 75 sources r1 255 r2 255 r4 255 r3 255 b-y y r-y 1395/6/7 f04 C + a4 1/4 lt1397 differential input signal swing to avoid any breakdown condition on the input transis- tors, the differential input swing must be limited to 5v. in normal operation, the differential voltage between the input pins is small, so the 5v limit is not an issue. buffered rgb to color-difference matrix an lt1397 can be used to create buffered color-difference signals from rgb inputs (figure 4). in this application, the r input arrives via 75 coax. it is routed to the non- inverting input of lt1397 ampli? er a1 and to a 845 resistor r8. there is also an 82.5 termination resistor r11, which yields a 75 input impedance at the r input when considered in parallel with r8. r8 connects to the inverting input of a second lt1397 ampli? er (a2), which also sums the weighted g and b inputs to create a C0.5 ? y output. lt1397 ampli? er a3 then takes the C0.5 ? y output and ampli? es it by a gain of C2, resulting in the y output. ampli? er a1 is con? gured in a noninvert- ing gain of 2 with the bottom of the gain resistor r2 tied to the y output. the output of ampli? er a1 thus results in the color-difference output r-y. the b input is similar to the r input. it arrives via 75 coax, and is routed to the noninverting input of lt1397 ampli? er a4, and to a 2320 resistor r10. there is also a 76.8 termination resistor r13, which yields a 75 v s = 5v v in = 1v r f = 255 r g = 255 r l = 100 1395/6/7 f02 output en v s = 5v v in = 1v r f = 255 r g = 255 r l = 100 1395/6/7 f03 output en figure 2. ampli? er enable time, a v = 2 figure 3. ampli? er disable time, a v = 2
lt1395/lt1396/lt1397 12 139567fd input impedance when considered in parallel with r10. r10 also connects to the inverting input of ampli? er a2, adding the b contribution to the y signal as discussed above. ampli? er a4 is con? gured in a noninverting gain of 2 con? guration with the bottom of the gain resistor r4 tied to the y output. the output of ampli? er a4 thus results in the color-difference output b-y. the g input also arrives via 75 coax and adds its con- tribution to the y signal via a 432 resistor r9, which is tied to the inverting input of ampli? er a2. there is also a 90.9 termination resistor r12, which yields a 75 termination when considered in parallel with r9. using superposition, it is straightforward to determine the output of ampli? er a2. although inverted, it sums the r, g and b signals in the standard proportions of 0.3r, 0.59g and 0.11b that are used to create the y signal. ampli? er a3 then inverts and ampli? es the signal by 2, resulting in the y output. buffered color-difference to rgb matrix an lt1395 combined with an lt1396 can be used to cre- ate buffered rgb outputs from color-difference signals (figure 5). the r output is a back-terminated 75 signal created using resistor r5 and ampli? er a1 con? gured for a gain of +4 via resistors r3 and r4. the noninverting input of ampli? er a1 is connected via 1k resistors r1 and r2 to the y and r-y inputs respectively, resulting in cancellation of the y signal at the ampli? er input. the remaining r signal is then ampli? ed by a1. the b output is also a back-terminated 75 signal cre- ated using resistor r16 and ampli? er a3 con? gured for a gain of +4 via resistors r14 and r15. the noninverting input of ampli? er a3 is connected via 1k resistors r12 and r13 to the y and b-y inputs respectively, resulting in cancellation of the y signal at the ampli? er input. the remaining b signal is then ampli? ed by a3. the g output is the most complicated of the three. it is a weighted sum of the y, r-y and b-y inputs. the y input is attenuated via resistors r6 and r7 such that ampli? er a2s noninverting input sees 0.83y. using superposition, we can calculate the positive gain of a2 by assuming that applications information figure 5. buffered color-difference to rgb matrix C + a2 lt1395 r7 1k b-y r-y y r10 267 r11 75 r6 205 r2 1k r1 1k r8 261 r9 698 C + a3 1/2 lt1396 r14 267 b g r16 75 r12 1k r13 1k r15 88.7 all resistors 1% v s = 5v C + a1 1/2 lt1396 r3 267 r r5 75 r4 88.7 1395/6/7 f05 r8 and r9 are grounded. this results in a gain of 2.41 and a contribution at the output of a2 of 2y. the r-y input is ampli? ed by a2 with the gain set by resistors r8 and r10, giving an ampli? cation of C1.02. this results in a contribution at the output of a2 of 1.02y C 1.02r. the b-y input is ampli? ed by a2 with the gain set by resistors r9 and r10, giving an ampli? cation of C 0.37. this results in a contribution at the output of a2 of 0.37y C 0.37b. if we now sum the three contributions at the output of a2, we get: a2 out = 3.40y C 1.02r C 0.37b it is important to remember though that y is a weighted sum of r, g and b such that: y = 0.3r + 0.59g + 0.11b if we substitute for y at the output of a2 we then get: a2 out = (1.02r C 1.02r) + 2g + (0.37b C 0.37b) = 2g the back-termination resistor r11 then halves the output of a2 resulting in the g output.
lt1395/lt1396/lt1397 13 139567fd simplified schematic package description +in en (lt1395cs6 only) Cin out v + v C 1395/6/7 ss for all non-disable devices (each ampli? er) dd package 8-lead plastic dfn (3mm 3mm) (reference ltc dwg # 05-08-1698 rev c) 3.00 p 0.10 (4 sides) note: 1. drawing to be made a jedec package outline m0-229 variation of (weed-1) 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 top and bottom of package 0.40 p 0.10 bottom viewexposed pad 1.65 p 0.10 (2 sides) 0.75 p 0.05 r = 0.125 typ 2.38 p 0.10 1 4 8 5 pin 1 top mark (note 6) 0.200 ref 0.00 C 0.05 (dd8) dfn 0509 rev c 0.25 p 0.05 2.38 p 0.05 recommended solder pad pitch and dimensions apply solder mask to areas that are not soldered 1.65 p 0.05 (2 sides) 2.10 p 0.05 0.50 bsc 0.70 p 0.05 3.5 p 0.05 package outline 0.25 p 0.05 0.50 bsc
lt1395/lt1396/lt1397 14 139567fd package description de package 14-lead plastic dfn (4mm 3mm) (reference ltc dwg # 05-08-1708 rev b) gn16 (ssop) 0204 12 3 4 5 6 7 8 .229 C .244 (5.817 C 6.198) .150 C .157** (3.810 C 3.988) 16 15 14 13 .189 C .196* (4.801 C 4.978) 12 11 10 9 .016 C .050 (0.406 C 1.270) .015 .004 (0.38 0.10) 45 0 C 8 typ .007 C .0098 (0.178 C 0.249) .0532 C .0688 (1.35 C 1.75) .008 C .012 (0.203 C 0.305) typ .004 C .0098 (0.102 C 0.249) .0250 (0.635) bsc .009 (0.229) ref .254 min recommended solder pad layout .150 C .165 .0250 bsc .0165 .0015 .045 .005 inches (millimeters) note: 1. controlling dimension: inches 2. dimensions are in 3. drawing not to scale * 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 gn package 16-lead plastic ssop (narrow .150 inch) (reference ltc dwg # 05-08-1641) 3.00 p 0.10 (2 sides) 4.00 p 0.10 (2 sides) note: 1. drawing proposed to be made variation of version (wged-3) in jedec package outline 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 0.40 p 0.10 bottom viewexposed pad 1.70 p 0.10 0.75 p 0.05 r = 0.115 typ r = 0.05 typ 3.00 ref 1 7 14 8 pin 1 top mark (see note 6) 0.200 ref 0.00 C 0.05 (de14) dfn 0806 rev b pin 1 notch r = 0.20 or 0.35 s 45 o chamfer 0.25 p 0.05 0.50 bsc 3.30 p 0.10 1.70 p 0.05 3.00 ref recommended solder pad pitch and dimensions apply solder mask to areas that are not soldered 2.20 p 0.05 0.70 p 0.05 3.60 p 0.05 package outline 0.25 p 0.05 3.30 p 0.05 0.50 bsc
lt1395/lt1396/lt1397 15 139567fd package description ms8 package 8-lead plastic msop (reference ltc dwg # 05-08-1660 rev f) msop (ms8) 0307 rev f 0.53 p 0.152 (.021 p .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 (.007) 0.254 (.010) 1.10 (.043) max 0.22 C 0.38 (.009 C .015) typ 0.1016 p 0.0508 (.004 p .002) 0.86 (.034) ref 0.65 (.0256) bsc 0 o C 6 o typ detail a detail a gauge plane 12 3 4 4.90 p 0.152 (.193 p .006) 8 7 6 5 3.00 p 0.102 (.118 p .004) (note 3) 3.00 p 0.102 (.118 p .004) (note 4) 0.52 (.0205) ref 5.23 (.206) min 3.20 C 3.45 (.126 C .136) 0.889 p 0.127 (.035 p .005) recommended solder pad layout 0.42 p 0.038 (.0165 p .0015) typ 0.65 (.0256) bsc
lt1395/lt1396/lt1397 16 139567fd package description s5 package 5-lead plastic tsot-23 (reference ltc dwg # 05-08-1633) 1.50 C 1.75 (note 4) 2.80 bsc 0.30 C 0.45 typ 5 plcs (note 3) datum a 0.09 C 0.20 (note 3) s5 tsot-23 0302 rev b pin one 2.90 bsc (note 4) 0.95 bsc 1.90 bsc 0.80 C 0.90 1.00 max 0.01 C 0.10 0.20 bsc 0.30 C 0.50 ref note: 1. dimensions are in millimeters 2. drawing not to scale 3. dimensions are inclusive of plating 4. dimensions are exclusive of mold flash and metal burr 5. mold flash shall not exceed 0.254mm 6. jedec package reference is mo-193 3.85 max 0.62 max 0.95 ref recommended solder pad layout per ipc calculator 1.4 min 2.62 ref 1.22 ref
lt1395/lt1396/lt1397 17 139567fd package description s6 package 6-lead plastic tsot-23 (reference ltc dwg # 05-08-1634) 1.50 C 1.75 (note 4) 2.80 bsc 0.30 C 0.45 6 plcs (note 3) datum a 0.09 C 0.20 (note 3) s6 tsot-23 0302 rev b 2.90 bsc (note 4) 0.95 bsc 1.90 bsc 0.80 C 0.90 1.00 max 0.01 C 0.10 0.20 bsc 0.30 C 0.50 ref pin one id note: 1. dimensions are in millimeters 2. drawing not to scale 3. dimensions are inclusive of plating 4. dimensions are exclusive of mold flash and metal burr 5. mold flash shall not exceed 0.254mm 6. jedec package reference is mo-193 3.85 max 0.62 max 0.95 ref recommended solder pad layout per ipc calculator 1.4 min 2.62 ref 1.22 ref
lt1395/lt1396/lt1397 18 139567fd package description s8 package 8-lead plastic small outline (narrow .150 inch) (reference ltc dwg # 05-08-1610) .016 C .050 (0.406 C 1.270) .010 C .020 (0.254 C 0.508) 45 0C 8 typ .008 C .010 (0.203 C 0.254) so8 0303 .053 C .069 (1.346 C 1.752) .014 C .019 (0.355 C 0.483) typ .004 C .010 (0.101 C 0.254) .050 (1.270) bsc 1 2 3 4 .150 C .157 (3.810 C 3.988) note 3 8 7 6 5 .189 C .197 (4.801 C 5.004) note 3 .228 C .244 (5.791 C 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)
lt1395/lt1396/lt1397 19 139567fd package description s package 14-lead plastic small outline (narrow .150 inch) (reference ltc dwg # 05-08-1610) 1 n 2 3 4 .150 C .157 (3.810 C 3.988) note 3 14 13 .337 C .344 (8.560 C 8.738) note 3 .228 C .244 (5.791 C 6.197) 12 11 10 9 5 6 7 n/2 8 .016 C .050 (0.406 C 1.270) .010 C .020 (0.254 C 0.508) s 45 0 C 8 typ .008 C .010 (0.203 C 0.254) s14 0502 .053 C .069 (1.346 C 1.752) .014 C .019 (0.355 C 0.483) typ .004 C .010 (0.101 C 0.254) .050 (1.270) bsc .245 min n 1 2 3 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)
lt1395/lt1396/lt1397 20 139567fd linear technology corporation 1630 mccarthy blvd., milpitas, ca 95035-7417 (408) 432-1900 fax: (408) 434-0507 www.linear.com ? linear technology corporation 1999 lt 0709 rev d ? printed in usa related parts typical application part number description comments lt1227/lt1229/lt1230 140mhz single/dual/quad current feedback ampli? er 1100v/s slew rate, single adds shutdown pin lt1252/lt1253/lt1254 low cost video ampli? ers single, dual and quad 100mhz current feedback ampli? ers lt1363/lt1364/lt1365 70mhz single/dual/quad op amps 1000v/s slew rate, voltage feedback lt1398/lt1399 dual/triple current feedback ampli? ers 300mhz bandwidth, 0.1db flatness > 150mhz with shutdown lt1675 triple 2:1 buffered video multiplexer 2.5ns switching time, 250mhz bandwidth lt6559 low cost triple current feedback ampli? ers 300mhz bandwidth, speci? ed at +5v and 5v, 3mm 3mm qfn package single supply rgb video ampli? er the lt1395 can be used with a single supply voltage of 6v or more to drive ground-referenced rgb video. in figure 6, two 1n4148 diodes d1 and d2 have been placed in series with the output of the lt1395 ampli? er a1 but within the feedback loop formed by resistor r8. these diodes effectively level-shift a1s output downward by 2 diodes, allowing the circuit output to swing to ground. ampli? er a1 is used in a positive gain con? guration. the feedback resistor r8 is 255. the gain resistor is created from the parallel combination of r6 and r7, giving a thevenin equivalent 63.5 connected to 3.75v. this gives an ac gain of + 5 from the noninverting input of ampli? er a1 to the cathode of d2. however, the video input is also attenuated before arriving at a1s positive input. assuming a 75 source impedance for the signal driving v in , the thevenin equivalent signal arriving at a1s positive input is 3v + 0.4v in , with a source impedance of 714. the combination of these two inputs gives an output at the cathode of d2 of 2 ? v in with no additional dc offset. the 75 back termination resistor r9 halves the signal again such that v out equals a buffered ver- sion of v in . it is important to note that the 4.7f capacitor c1 has been added to provide enough current to maintain the voltage drop across diodes d1 and d2 when the circuit output drops low enough that the diodes might other- wise turn off. this means that this circuit works ? ne for continuous video input, but will require that c1 charge up after a period of inactivity at the input. C + a1 lt1395 d1 1n4148 c1 4.7f d2 1n4148 r9 75 r8 255 v s 6v to 12v r7 255 r5 2.32 r4 75 v in r2 1300 r1 1000 5v r6 84.5 r3 160 v out 1395/6/7 ta03 figure 6. single supply rgb video ampli? er (1 of 4 channels)

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