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1 lt1800 sn1800 1800fs 80mhz, 25v/ m s low power rail-to-rail input and output precision op amp the lt ? 1800 is a low power, high speed rail-to-rail input and output operational amplifier with excellent dc perfor- mance. the lt1800 features reduced supply current, lower input offset voltage, lower input bias current and higher dc gain than other devices with comparable bandwidth. the lt1800 has an input range that includes both supply rails and an output that swings within 20mv of either sup- ply rail to maximize the signal dynamic range in low supply applications. the lt1800 maintains its performance for supplies from 2.3v to 12.6v and is specified at 3v, 5v and 5v supplies. the inputs can be driven beyond the supplies without damage or phase reversal of the output. the lt1800 is available in the 8-pin so package with the standard op amp pinout and in the 5-pin sot-23 package. for dual and quad versions of the lt1800, see the lt1801/ lt1802 data sheet. the lt1800 can be used as a plug-in replacement for many op amps to improve input/output range and performance. n gain bandwidth product: 80mhz n input common mode range includes both rails n output swings rail-to-rail n low quiescent current: 2ma max n input offset voltage: 350 m v max n input bias current: 250na max n low voltage noise: 8.5nv/ ? hz n slew rate: 25v/ m s n common mode rejection: 105db n power supply rejection: 97db n open-loop gain: 85v/mv n available in the 8-pin so and 5-pin low profile (1mm) thinsot tm packages n operating temperature range: C 40 c to 85 c , ltc and lt are registered trademarks of linear technology corporation. n low voltage, high frequency signal processing n driving a/d converters n rail-to-rail buffer amplifiers n active filters n video line driver + lt1800 v in do not float ir laser infineon sfh495 q1 zetex fmmt619 5v r2 330 w r1 1 w 1800 ta01 c1 39pf r3 10 w descriptio u features applicatio s u typical applicatio u single supply 1a laser driver amplifier laser driver amplifier 500ma pulse response 100ma/div 50ns/div 1800 ta02 thinsot is a trademark of linear technology corporation.
2 lt1800 sn1800 1800fs order part number s8 part marking lt1800cs8 lt1800is8 1800 1800i t jmax = 150 c, q ja = 190 c/ w total supply voltage (v s C to v s + ) ......................... 12.6v input current (note 2) ........................................ 10ma output short-circuit duration (note 3) ............ indefinite operating temperature range (note 4) .. C 40 c to 85 c absolute axi u rati gs w ww u package/order i for atio uu w consult ltc marketing for parts specified with wider operating temperature ranges. specified temperature range (note 5) ... C 40 c to 85 c junction temperature .......................................... 150 c storage temperature range ................. C 65 c to 150 c lead temperature (soldering, 10 sec).................. 300 c (note 1) 1 2 3 4 8 7 6 5 top view nc v s + v out nc nc ?n +in v s s8 package 8-lead plastic so + order part number s5 part marking lt1800cs5 lt1800is5 ltrn ltrp v out 1 v s 2 top view s5 package 5-lead plastic sot-23 +in 3 5 v s + 4 ?n + t jmax = 150 c, q ja = 250 c/ w t a = 25 c, v s = 5v, 0v; v s = 3v, 0v; v cm = v out = half supply, unless otherwise noted. electrical characteristics symbol parameter conditions min typ max units v os input offset voltage v cm = 0v 75 350 m v v cm = 0v (sot-23) 300 750 m v v cm = v s 0.5 3 mv v cm = v s (sot-23) 0.7 3.5 mv d v os input offset shift v cm = 0v to v s C 1.5v 20 180 m v i b input bias current v cm = 1v 25 250 na v cm = v s 500 1500 na i os input offset current v cm = 1v 25 200 na v cm = v s 25 200 na input noise voltage 0.1hz to 10hz 1.4 m v p-p e n input noise voltage density f = 10khz 8.5 nv/ ? hz i n input noise current density f = 10khz 1 pa/ ? hz c in input capacitance f = 100khz 2 pf a vol large-signal voltage gain v s = 5v, v o = 0.5v to 4.5v, r l = 1k at v s /2 35 85 v/mv v s = 5v, v o = 1v to 4v, r l = 100 w at v s /2 3.5 8 v/mv v s = 3v, v o = 0.5v to 2.5v, r l = 1k at v s /2 30 85 v/mv cmrr common mode rejection ratio v s = 5v, v cm = 0v to 3.5v 85 105 db v s = 3v, v cm = 0v to 1.5v 78 97 db input common mode range 0 v s v psrr power supply rejection ratio v s = 2.5v to 10v, v cm = 0v 80 97 db minimum supply voltage (note 6) 2.3 2.5 v
3 lt1800 sn1800 1800fs t a = 25 c, v s = 5v, 0v; v s = 3v, 0v; v cm = v out = half supply, unless otherwise noted. electrical characteristics symbol parameter conditions min typ max units v ol output voltage swing low (note 7) no load 12 50 mv i sink = 5ma 80 160 mv i sink = 20ma 225 450 mv v oh output voltage swing high (note 7) no load 16 60 mv i source = 5ma 120 250 mv i source = 20ma 450 850 mv i sc short-circuit current v s = 5v 20 45 ma v s = 3v 20 40 ma i s supply current per amplifier 1.6 2 ma gbw gain bandwidth product frequency = 2mhz 40 80 mhz sr slew rate v s = 5v, a v = C 1, r l = 1k, v o = 4v 13 25 v/ m s fpbw full power bandwidth v s = 5v, v out = 4v p-p 2 mhz hd harmonic distortion v s = 5v, a v = 1, r l = 1k, v o = 2v p-p , f c = 500khz C75 dbc t s settling time 0.01%, v s = 5v, v step = 2v, a v = 1, r l = 1k 250 ns d g differential gain (ntsc) v s = 5v, a v = + 2, r l = 150 w 0.35 % dq differential phase (ntsc) v s = 5v, a v = + 2, r l = 150 w 0.4 deg the l denotes the specifications which apply over the temperature range of 0 c t a 70 c. v s = 5v, 0v; v s = 3v, 0v; v cm = v out = half supply, unless otherwise noted. symbol parameter conditions min typ max units v os input offset voltage v cm = 0v l 125 500 m v v cm = 0v (sot-23) l 300 1250 m v v cm = v s l 0.6 3.5 mv v cm = v s (sot-23) l 0.7 3.75 mv d v os input offset shift v cm = 0v to v s C 1.5v l 30 275 m v v os tc input offset voltage drift (note 8) l 1.5 5 m v/ c i b input bias current v cm = 1v l 50 300 na v cm = v s C 0.2v l 550 1750 na i os input offset current v cm = 1v l 25 250 na v cm = v s C 0.2v l 25 250 na a vol large-signal voltage gain v s = 5v, v o = 0.5v to 4.5v, r l = 1k at v s /2 l 30 75 v/mv v s = 5v, v o = 1v to 4v, r l = 100 w at v s /2 l 3 6 v/mv v s = 3v, v o = 0.5v to 2.5v, r l = 1k at v s /2 l 25 75 v/mv cmrr common mode rejection ratio v s = 5v, v cm = 0v to 3.5v l 82 101 db v s = 3v, v cm = 0v to 1.5v l 74 93 db input common mode range l 0v s v psrr power supply rejection ratio v s = 2.5v to 10v, v cm = 0v l 74 91 db minimum supply voltage (note 6) l 2.3 2.5 v v ol output voltage swing low (note 7) no load l 14 60 mv i sink = 5ma l 100 200 mv i sink = 20ma l 300 550 mv v oh output voltage swing high (note 7) no load l 25 80 mv i source = 5ma l 150 300 mv i source = 20ma l 600 1000 mv i sc short-circuit current v s = 5v l 20 40 ma v s = 3v l 20 30 ma i s supply current per amplifier l 2 2.75 ma gbw gain bandwidth product frequency = 2mhz l 35 75 mhz sr slew rate v s = 5v, a v = C 1, r l = 1k, v o = 4v p-p l 11 22 v/ m s
4 lt1800 sn1800 1800fs electrical characteristics the l denotes the specifications which apply over the temperature range of C 40 c t a 85 c. v s = 5v, 0v; v s = 3v, 0v; v cm = v out = half supply, unless otherwise noted. (note 5) symbol parameter conditions min typ max units v os input offset voltage v cm = 0v l 175 700 m v v cm = 0v (sot-23) l 400 2000 m v v cm = v s l 0.75 4 mv v cm = v s (sot-23) l 0.9 4 mv d v os input offset shift v cm = 0v to v s C 1.5v l 30 300 m v v os tc input offset voltage drift (note 8) l 1.5 5 m v/ c i b input bias current v cm = 1v l 50 400 na v cm = v s C 0.2v l 600 2000 na i os input offset current v cm = 1v l 25 300 na v cm = v s C 0.2v l 25 300 na a vol large-signal voltage gain v s = 5v, v o = 0.5v to 4.5v, r l = 1k at v s /2 l 25 65 v/mv v s = 5v, v o = 1.5v to 3.5v, r l = 100 w at v s /2 l 2.5 6 v/mv v s = 3v, v o = 0.5v to 2.5v, r l = 1k at v s /2 l 20 65 v/mv cmrr common mode rejection ratio v s = 5v, v cm = 0v to 3.5v l 81 101 db v s = 3v, v cm = 0v to 1.5v l 73 93 db input common mode range l 0v s v psrr power supply rejection ratio v s = 2.5v to 10v, v cm = 0v l 73 90 db minimum supply voltage (note 6) l 2.3 2.5 v v ol output voltage swing low (note 7) no load l 15 70 mv i sink = 5ma l 105 210 mv i sink = 10ma l 170 400 mv v oh output voltage swing high (note 7) no load l 25 90 mv i source = 5ma l 150 350 mv i source = 10ma l 300 700 mv i sc short-circuit current v s = 5v l 12.5 30 ma v s = 3v l 12.5 30 ma i s supply current per amplifier l 2.1 3 ma gbw gain bandwidth product frequency = 2mhz l 30 70 mhz sr slew rate v s = 5v, a v = C 1, r l = 1k, v o = 4v l 10 18 v/ m s t a = 25 c, v s = 5v, v cm = 0v, v out = 0v, unless otherwise noted. symbol parameter conditions min typ max units v os input offset voltage v cm = v s C 150 500 m v v cm = v s C (sot-23) 400 1000 m v v cm = v s + 0.7 3.5 mv v cm = v s + (sot-23) 1 4.5 mv d v os input offset shift v cm = v s C to v s + C 1.5v 30 475 m v i b input bias current v cm = v s C + 1v 25 350 na v cm = v s + 400 1500 na i os input offset current v cm = v s C + 1v 20 250 na v cm = v s + 20 250 na input noise voltage 0.1hz to 10hz 1.4 m v p-p e n input noise voltage density f = 10khz 8.5 nv/ ? hz i n input noise current density f = 10khz 1 pa/ ? hz c in input capacitance f = 100khz 2 pf
5 lt1800 sn1800 1800fs t a = 25 c, v s = 5v, v cm = 0v, v out = 0v, unless otherwise noted. electrical characteristics symbol parameter conditions min typ max units a vol large-signal voltage gain v o = C4v to 4v, r l = 1k 25 70 v/mv v o = C2v to 2v, r l = 100 w 2.5 7 v/mv cmrr common mode rejection ratio v cm = v s C to 3.5v 85 109 db input common mode range v s C v s + v psrr power supply rejection ratio v s + = 2.5v to 10v, v s C = 0v 80 97 db v ol output voltage swing low (note 7) no load 15 60 mv i sink = 5ma 85 170 mv i sink = 20ma 225 450 mv v oh output voltage swing high (note 7) no load 17 70 mv i source = 5ma 130 260 mv i source = 20ma 450 900 mv i sc short-circuit current 30 50 ma i s supply current per amplifier 1.8 2.75 ma gbw gain bandwidth product frequency = 2mhz 70 mhz sr slew rate a v = C 1, r l = 1k, v o = 4v, measured at v o = 2v 23 v/ m s fpbw full power bandwidth v o = 8v p-p 0.9 mhz hd harmonic distortion a v = 1, r l = 1k, v o = 2v p-p , f c = 500khz C75 dbc t s settling time 0.01%, v step = 5v, a v = 1v, r l = 1k 300 ns d g differential gain (ntsc) a v = + 2, r l = 150 w 0.35 % dq differential phase (ntsc) a v = + 2, r l = 150 w 0.2 deg the l denotes the specifications which apply over the temperature range of 0 c t a 70 c. v s = 5v, v cm = 0v, v out = 0v, unless otherwise noted. symbol parameter conditions min typ max units v os input offset voltage v cm = v s C l 200 800 m v v cm = v s C (sot-23) l 450 1500 m v v cm = v s + l 0.75 4 mv v cm = v s + (sot-23) l 15 mv d v os input offset shift v cm = v s C to v s + C 1.5v l 45 675 m v v os tc input offset voltage drift (note 8) l 1.5 5 m v/ c i b input bias current v cm = v s C + 1v l 30 400 na v cm = v s + C 0.2v l 450 1750 na i os input offset current v cm = v s C + 1v l 25 300 na v cm = v s + C 0.2v l 25 300 na a vol large-signal voltage gain v o = C4v to 4v, r l = 1k l 20 55 v/mv v o = C2v to 2v, r l = 100 w l 2 5 v/mv cmrr common mode rejection ratio v cm = v s C to 3.5v l 82 105 db input common mode range l v s C v s + v psrr power supply rejection ratio v s + = 2.5v to 10v, v s C = 0v l 74 91 db v ol output voltage swing low (note 7) no load l 17 70 mv i sink = 5ma l 105 210 mv i sink = 20ma l 250 575 mv v oh output voltage swing high (note 7) no load l 25 90 mv i source = 5ma l 150 310 mv i source = 20ma l 600 1100 mv
6 lt1800 sn1800 1800fs electrical characteristics the l denotes the specifications which apply over the temperature range of 0 c t a 70 c. v s = 5v, v cm = 0v, v out = 0v, unless otherwise noted. symbol parameter conditions min typ max units i sc short-circuit current l 25 45 ma i s supply current per amplifier l 2.4 3.5 ma gbw gain bandwidth product frequency = 2mhz l 70 mhz sr slew rate a v = C 1, r l = 1k, v o = 4v, measured at v o = 2v l 20 v/ m s the l denotes the specifications which apply over the temperature range of C 40 c t a 85 c. v s = 5v, v cm = 0v, v out = 0v, unless otherwise noted. symbol parameter conditions min typ max units v os input offset voltage v cm = v s C l 350 900 m v v cm = v s C (sot-23) l 500 2250 m v v cm = v s + l 0.75 4.5 mv v cm = v s + (sot-23) l 1 5.5 mv d v os input offset shift v cm = v s C to v s + C 1.5v l 50 750 m v v os tc input offset voltage drift (note 8) l 1.5 5 m v/ c i b input bias current v cm = v s C + 1v l 50 450 na v cm = v s + C 0.2v l 450 2000 na i os input offset current v cm = v s C + 1v l 25 350 na v cm = v s + C 0.2v l 25 350 na a vol large-signal voltage gain v o = C4v to 4v, r l = 1k l 16 55 v/mv v o = C1v to 1v, r l = 100 w l 2 5 v/mv cmrr common mode rejection ratio v cm = v s C to 3.5v l 81 104 db input common mode range l v s C v s + v psrr power supply rejection ratio v s + = 2.5v to 10v, v s C = 0v l 73 90 db v ol output voltage swing low (note 7) no load l 15 80 mv i sink = 5ma l 105 220 mv i sink = 10ma l 170 400 mv v oh output voltage swing high (note 7) no load l 25 100 mv i source = 5ma l 150 350 mv i source = 10ma l 300 700 mv i sc short-circuit current l 12.5 30 ma i s supply current per amplifier l 2.6 4 ma gbw gain bandwidth product frequency = 2mhz l 65 mhz sr slew rate a v = C 1, r l = 1k, v o = 4v, measured at v o = 2v l 15 v/ m s note 1: absolute maximum ratings are those values beyond which the life of the device may be impaired. note 2: the inputs are protected by back-to-back diodes and by esd diodes to the supply rails. if the differential input voltage exceeds 1.4v or either input goes outside the rails, the input current should be limited to less than 10ma. note 3: a heat sink may be required to keep the junction temperature below the absolute maximum rating when the output is shorted indefinitely. note 4: the lt1800c/lt1800i are guaranteed functional over the temperature range of C 40 c to 85 c. note 5: the lt1800c is guaranteed to meet specified performance from 0 c to 70 c. the lt1800c is designed, characterized and expected to meet specified performance from C40 c to 85 c but is not tested or qa sampled at these temperatures. the lt1800i is guaranteed to meet specified performance from C40 c to 85 c. note 6: minimum supply voltage is guaranteed by power supply rejection ratio test. note 7: output voltage swings are measured between the output and power supply rails. note 8: this parameter is not 100% tested.
7 lt1800 sn1800 1800fs typical perfor a ce characteristics uw supply current vs supply voltage total supply voltage (v) 1 0 supply current (ma) 3 12 1800 g03 0 357910 2468 11 4 2 1 t a = 125 c t a = 25 c t a = 55 c offset voltage vs input common mode voltage input common mode voltage (v) 0 offset voltage ( v) 100 300 500 4 1800 g04 ?00 300 0 200 400 200 400 500 1 2 3 5 v s = 5v, 0v typical part t a = 55 c t a = 125 c t a = 25 c input common mode voltage (v) ? input bias current ( a) 0.2 0.6 1.0 4 1800 g05 0.2 0.6 0 0.4 0.8 0.4 0.8 ?.0 0 1 23 5 6 v s = 5v, 0v t a = 25 c t a = 125 c t a = 55 c temperature ( c) ?0 0.1 input bias ( a) 0 0.2 0.3 0.4 40 60 80 0.8 1800 g06 0.1 40 20 0 20 0.5 0.6 0.7 npn active v s = 5v, 0v v cm = 5v pnp active v s = 5v, 0v v cm = 1v input bias current vs common mode voltage input bias current vs temperature output saturation voltage vs load current (output low) load current (ma) 0.01 0.1 0.001 output saturation voltage (v) 0.1 10 1 10 100 1800 g07 0.01 1 v s = 5v, 0v t a = 125 c t a = 55 c t a = 25 c input offset voltage ( v) 250 0 percent of units (%) 5 15 20 25 50 150 45 1800 g01 10 ?50 50 250 30 35 40 v s = 5v, 0v v cm = 0v v os distribution, v cm = 0v (so-8, pnp stage) input offset voltage ( v) 2000 0 percent of units (%) 5 15 20 25 400 1200 45 1800 g02 10 ?200 400 2000 30 35 40 v s = 5v, 0v v cm = 5v v os distribution, v cm = 5v (so-8, npn stage) input offset voltage ( v) ?250 percent of units (%) 40 35 30 25 20 15 10 5 0 750 1800 g38 750 250 250 1250 v s = 5v, 0v v cm = 0v v os distribution, v cm = 0v (sot-23, pnp stage) v os distribution, v cm = 5v (sot-23, npn stage) input offset voltage ( v) ?500 0 percent of units (%) 5 15 20 25 35 1800 g39 10 30 ?00 2500 ?500 500 1500 v s = 5v, 0v v cm = 5v
8 lt1800 sn1800 1800fs typical perfor a ce characteristics uw open-loop gain open-loop gain offset voltage vs output current warm-up drift vs time (lt1800s8) open-loop gain output short-circuit current vs power supply voltage power supply voltage ( v) 1.5 ?0 output short-circuit current (ma) ?0 ?0 ?0 70 30 2 3 3.5 5 50 10 ?0 ?0 ?0 60 20 40 0 2.5 4 4.5 t a = 125 c t a = 125 c t a = 55 c sinking v s = 5v, 0v sourcing t a = 55 c t a = 25 c t a = 25 c 1800 g10 output voltage (v) 0 2000 change in offset voltage ( v) ?200 400 400 0.5 1 1.5 2 1800 g11 2.5 1200 2000 ?600 800 0 800 1600 3 v s = 3v, 0v r l to gnd r l = 1k r l = 100 output voltage (v) 0 change in offset voltage ( v) 400 1200 2000 4 1800 g12 400 ?200 0 800 1600 800 ?600 2000 1 0.5 2 1.5 3 3.5 4.5 2.5 5 v s = 5v, 0v r l to gnd r l = 1k r l = 100 output voltage (v) ? change in offset voltage ( v) 400 1200 2000 3 1800 g13 400 ?200 0 800 1600 800 ?600 2000 ? ? ? ? 12 4 0 5 v s = 5v r l to gnd r l = 1k r l = 100 output current (ma) ?0 change in offset voltage (mv) 0 1.0 60 1800 g14 ?.0 2.0 ?0 0 30 ?5 ?5 15 45 2.0 0.5 0.5 ?.5 1.5 v s = 5v t a = 125 c t a = 55 c t a = 25 c time after power-up (seconds) 0 offset voltage ( v) 110 60 1800 g15 80 60 20 40 80 50 40 120 100 90 70 100 120 140 v s = 5v v s = 2.5v v s = 1.5v typical part input noise voltage vs frequency frequency (khz) 20 noise voltage (nv/ hz) 40 60 10 30 50 0.01 1 10 100 1800 g16 0 0.1 v s = 5v, 0v npn active v cm = 4.25v pnp active v cm = 2.5v output saturation voltage vs load current (output high) load current (ma) 0.01 0.1 0.001 output saturation voltage (v) 0.1 10 1 10 100 1800 g08 0.01 1 v s = 5v, 0v t a = 125 c t a = 55 c t a = 25 c minimum supply voltage total supply voltage (v) 0 0.6 change in offset voltage (mv) 0.4 0 0.2 0.4 2 3 3.5 5.5 1800 g09 0.2 1.5 2.5 4 4.5 5 0.6 t a = 125 c t a = 55 c t a = 25 c
9 lt1800 sn1800 1800fs typical perfor a ce characteristics uw gain bandwidth and phase margin vs supply voltage total supply voltage (v) 0 gain bandwidth (mhz) phase margin (deg) 100 90 80 70 60 60 50 40 30 20 8 1800 g19 246 10 7 135 9 gain bandwidth product phase margin t a = 25 c temperature ( c) ?5 gain bandwidth (mhz) phase margin (deg) 50 100 70 ?5 25 45 125 1800 g20 80 90 60 10 20 40 50 60 30 ?5 5 65 85 105 gbw product v s = 2.5v phase margin v s = 2.5v phase margin v s = 5v gbw product v s = 5v temperature ( c) ?5 10 slew rate (v/ s) 15 25 30 35 ?5 25 45 125 1800 g21 20 ?5 5 65 85 105 a v = ? r f = r g = 1k r l = 1k v s = 2.5v v s = 5v gain bandwidth and phase margin vs temperature slew rate vs temperature gain and phase vs frequency frequency (mhz) 0.01 10 open-loop gain (db) phase (deg) 20 30 40 50 0.1 1 10 100 300 1800 g22 040 ?0 ?0 ?0 60 70 ?0 0 20 40 60 ?0 ?0 ?00 80 100 v s = 2.5v v s = 5v phase gain gain vs frequency (a v = 1) frequency (mhz) ? gain (db) 0 3 9 12 0.1 10 100 300 1800 g23 ?2 1 6 ? ? r l = 1k c l = 10pf a v = 1 v s = 5v v s = 2.5v frequency (mhz) 0 gain (db) 6 9 15 18 0.1 10 100 300 1800 g24 ? 1 12 3 ? r l = 1k c l = 10pf a v = 2 v s = 5v v s = 2.5v gain vs frequency (a v = 2) output impedance vs frequency frequency (mhz) 0.1 0.001 output impedance ( ) 0.1 600 100 1 10 100 500 1800 g25 0.01 1 10 v s = 2.5v a v = 10 a v = 1 a v = 2 0.1hz to 10hz output voltage noise time (seconds) 0 output noise voltage (nv) 2000 1000 0 ?000 ?000 8 1800 g18 246 10 7 135 9 v s = 5v, 0v input current noise vs frequency frequency (khz) 1.0 noise current (pa/ hz) 2.0 3.0 0.5 1.5 2.5 0.01 1 10 100 1800 g17 0 0.1 v s = 5v, 0v npn active v cm = 4.25v pnp active v cm = 2.5v
10 lt1800 sn1800 1800fs typical perfor a ce characteristics uw series output resistor vs capacitive load capacitive load (pf) 10 20 overshoot (%) 30 40 100 1000 10000 1800 g28 10 0 60 50 15 25 35 5 55 45 v s = 5v, 0v a v = 1 r os = 10 r os = 20 r os = r l = 50 series output resistor vs capacitive load capacitive load (pf) 10 20 overshoot (%) 30 40 100 1000 10000 1800 g29 10 0 60 50 15 25 35 5 55 45 v s = 5v, 0v a v = 2 r os = 10 r os = r l = 50 r os = 20 frequency (mhz) 0.01 ?0 distortion (dbc) ?0 ?0 ?0 0.1 1 10 1800 g30 ?0 ?0 ?00 ?10 v s = 5v, 0v a v = 1 v out = 2v p-p r l = 150 , 2nd r l = 150 , 3rd r l = 1k, 2nd r l = 1k, 3rd distortion vs frequency distortion vs frequency frequency (mhz) 0.01 ?0 distortion (dbc) ?0 ?0 ?0 0.1 1 10 1800 g31 ?0 ?0 ?00 ?10 v s = 5v, 0v a v = 2 v out = 2v p-p r l = 150 , 2nd r l = 150 , 3rd r l = 1k, 2nd r l = 1k, 3rd 5v large-signal response 1v/div v s = 5v, 0v 100ns/div 1800 g33 a v = 1 r l = 1k 0v 5v small-signal response 50mv/div v s = 5v, 0v 50ns/div 1800 g34 a v = 1 r l = 1k 0v common mode rejection ratio vs frequency frequency (mhz) 40 common mode rejection ratio (db) 80 120 20 60 100 0.01 1 10 100 1800 g26 0 0.1 v s = 5v, 0v power supply rejection ratio vs frequency frequency (mhz) 0.001 30 power supply rejection ratio (db) 40 50 60 70 0.01 0.1 1 10 100 1800 g27 20 10 0 ?0 80 90 v s = 5v, 0v t a = 25 c positive supply negative supply maximum undistorted output signal vs frequency frequency (hz) 4.1 output voltage swing (v p-p ) 4.3 4.5 4.6 1k 100k 1m 10m 1800 g32 3.9 10k 4.4 4.2 4.0 v s = 5v, 0v r l = 1k a v = ? a v = 2
11 lt1800 sn1800 1800fs typical perfor a ce characteristics uw applicatio s i for atio wu uu 5v small-signal response 50mv/div v s = 5v 50ns/div 1800 g36 a v = 1 r l = 1k 0v output overdriven recovery v in 1v/div v s = 5v, 0v 100ns/div 1800 g37 a v = 2 r l = 1k 0v 0v v out 2v/div circuit description the lt1800 has an input and output signal range that covers from the negative power supply to the positive power supply. figure 1 depicts a simplified schematic of the amplifier. the input stage is comprised of two differ- ential amplifiers, a pnp stage q1/q2 and an npn stage q3/ q4 that are active over the different ranges of common mode input voltage. the pnp differential pair is active between the negative supply to approximately 1.2v below q4 q18 q17 q16 q6 q3 q7 q10 q1 q13 q15 out q2 q11 q12 q9 q5 v bias i 1 d2 d1 d5 d4 d3 d6 d7 d8 esdd2 esdd1 +in ?n v esdd3 esdd4 v + v + v q8 r2 r1 r3 r4 r5 q14 1800 f01 + i 2 + i 3 c2 c c v + c1 buffer and output bias v + v q19 figure 1. lt1800 simplified schematic diagram the positive supply. as the input voltage moves closer toward the positive supply, the transistor q5 will steer the tail current i 1 to the current mirror q6/q7, activating the npn differential pair and the pnp pair becomes inactive for the rest of the input common mode range up to the positive supply. also at the input stage, devices q17 to q19 act to cancel the bias current of the pnp input pair. when q1-q2 are active, the current in q16 is controlled to be the same as the current in q1-q2, thus the base current 5v large-signal response 2v/div v s = 5v 200ns/div 1800 g35 a v = 1 r l = 1k 0v
12 lt1800 sn1800 1800fs applicatio s i for atio wu uu of q16 is nominally equal to the base current of the input devices. the base current of q16 is then mirrored by devices q17-q19 to cancel the base current of the input devices q1-q2. a pair of complementary common emitter stages q14/q15 that enable the output to swing from rail to rail constructs the output stage. the capacitors c2 and c3 form the local feedback loops that lower the output impedance at high frequency. these devices are fabricated on linear technologys proprietary high-speed complementary bi- polar process. power dissipation the lt1800 amplifier is offered in a small package, sot-23, which has a thermal resistance of 250 c/w, q ja . so there is a need to ensure that the dies junction temperature should not exceed 150 c. junction temperature t j is calculated from the ambient temperature t a , power dissi- pation p d and thermal resistance q ja : t j = t a + (p d ? q ja ) the power dissipation in the ic is the function of the supply voltage, output voltage and the load resistance. for a given supply voltage, the worst-case power dissipation p dmax occurs at the maximum supply current and the output voltage is at half of either supply voltage (or the maximum swing is less than 1/2 supply voltage). p dmax is given by: p dmax = (v s ? i smax ) + (v s /2) 2 /r l example: an lt1800 in a sot-23 package operating on 5v supplies and driving a 50 w load, the worst-case power dissipation is given by: p dmax = (10 ? 4ma) + (2.5) 2 /50 = 0.04 + 0.125 = 0.165w the maximum ambient temperature that the part is al- lowed to operate is: t a = t j C (p dmax ? 250 c/w) = 150 c C (0.165w ? 250 c/w) = 108 c input offset voltage the offset voltage will change depending upon which input stage is active. the pnp input stage is active from the negative supply rail to 1.2v of the positive supply rail, then the npn input stage is activated for the remaining input range up to the positive supply rail during which the pnp stage remains inactive. the offset voltage is typically less than 75 m v in the range that the pnp input stage is active. input bias current the lt1800 employs a patent-pending technique to trim the input bias current to less than 250na for the input common mode voltage of 0.2v above negative supply rail to 1.2v of the positive rail. the low input offset voltage and low input bias current of the lt1800 provide the precision performance especially for high source imped- ance applications. output the lt1800 can deliver a large output current, so the short-circuit current limit is set around 50ma to prevent damage to the device. attention must be paid to keep the junction temperature of the ic below the absolute maxi- mum rating of 150 c (refer to the power dissipation section) when the output is continuously short circuited. the output of the amplifier has reverse-biased diodes connected to each supply. if the output is forced beyond either supply, unlimited current will flow through these diodes. if the current is transient and limited to several hundred ma, and the total supply voltage is less than 12.6v, the absolute maximum rating, no damage will occur to the device. overdrive protection when the input voltage exceeds the power supplies, two pairs of crossing diodes d1 to d4 will prevent the output from reversing polarity. if the input voltage exceeds either power supply by 700mv, diode d1/d2 or d3/d4 will turn on to keep the output at the proper polarity. for the phase reversal protection to perform properly, the input current must be limited to less than 10ma. if the amplifier is severely overdriven, an external resistor should be used to limit the overdrive current. the lt1800s input stages are also protected against a large differential input voltage of 1.4v or higher by a pair of back-back diodes d5/d8 to prevent the emitter-base breakdown of the input transistors. the current in these
13 lt1800 sn1800 1800fs applicatio s i for atio wu uu diodes should be limited to less than 10ma when they are active. the worst-case differential input voltage usually occurs when the input is driven while the output is shorted to ground in a unity gain configuration. in addition, the amplifier is protected against esd strikes up to 3kv on all pins by a pair of protection diodes on each pin that are connected to the power supplies as shown in figure1. capacitive load the lt1800 is optimized for high bandwidth, low power and precision applications. it can drive a capacitive load of about 75pf in a unity gain configuration, and more for higher gain. when driving a larger capacitive load, a resistor of 10 w to 50 w should be connected between the output and the capacitive load to avoid ringing or oscilla- tion. the feedback should still be taken from the output so that the resistor will isolate the capacitive load to ensure stability. graphs on capacitive loads indicate the transient response of the amplifier when driving capacitive load with a specified series resistor. feedback components when feedback resistors are used to set up gain, care must be taken to ensure that the pole formed by the feedback resistors and the total capacitance at the inverting input does not degrade stability. for instance, the lt1800 in a noninverting gain of 2, set up with two 5k resistors and a capacitance of 5pf (part plus pc board) will probably ring in transient response. the pole is formed at 12.7mhz that will reduce phase margin by 32 degrees when the cross- over frequency of the amplifier is around 20mhz. a capaci- tor of 5pf or higher connected across the feedback resis- tor will eliminate any ringing or oscillation. applicatio s i for atio wu uu single supply 1a laser driver amplifier the circuit in the front page of this data sheet shows the lt1800 used in a 1a laser driver application. one of the reasons the lt1800 is well suited to this control task is that its 2.3v operation ensures that it will be awake during power-up and operated before the circuit can otherwise cause significant current to flow in the 2.1v threshold laser diode. driving the noninverting input of the lt1800 to a voltage v in will control the turning on of the high current npn transistor, fmmt619 and the laser diode. a current equal to v in /r1 flows through the laser diode. the lt1800 low offset voltage and low input bias current allows it to control the current that flows through the laser diode precisely. the overall circuit is a 1a per volt v-to-i con- verter. frequency compensation components r2 and c1 are selected for fast but zero-overshoot time domain response to avoid overcurrent conditions in the laser. the time domain response of this circuit, measured at r1 and given a 500mv 230ns input pulse, is also shown in the graphic on the front page. while the circuit is capable of 1a operation, the laser diode and the transistor are thermally limited due to power dissipation, so they must be operated at low duty cycles. fast 1a current sense amplifier a simple, fast current sense amplifier in figure 2 is suitable for quickly responding to out-of-range currents. the cir- cuit amplifies the voltage across the 0.1 w sense resistor by a gain of 20, resulting in a conversion gain of 2v/a. the C3db bandwidth of the circuit is 4mhz, and the uncertainty due to v os and i b is less than 4ma. the minimum output voltage is 60mv, corresponding to 30ma. the large-signal response of the circuit is shown in figure 3. + lt1800 0.1 w i l 0a to 1a v out 0v to 2v v out = 2 ?i l f ?db = 4mhz uncertainty due to v os, i b < 4ma 3v 1k 1800 f02 52.3 w 52.3 w figure 2. fast 1a current sense
14 lt1800 sn1800 1800fs typical applicatio s u + lt1800 909 w v in v s /2 v out 1800 f04 220pf 909 w 2.67k + lt1800 1.1k 22pf 3v 470pf 2.21k 1.1k 47pf figure 4. 3v, 1mhz, 4th order butterworth filter figure 5. frequency response of filter frequency (hz) ?0 gain (db) ?0 0 ?00 ?0 ?0 1k 100k 1m 10m 100m 1800 f05 ?20 10k figure 3. current sense amplifier large-signal response 500mv/div 0v v s = 3v 50ns/div 1800 f03 single 3v supply, 1mhz, 4th order butterworth filter the circuit shown in figure 4 makes use of the low voltage operation and the wide bandwidth of the lt1800 to create a dc accurate 1mhz 4th order lowpass filter powered from a 3v supply. the amplifiers are configured in the inverting mode for the lowest distortion and the output can swing rail-to-rail for maximum dynamic range. figure 5 displays the frequency response of the filter. stopband attenuation is greater than 100db at 50mhz. with a 2.25v p-p , 250khz input signal, the filter has harmonic distortion products of less than C85dbc. worst case output offset voltage is less than 6mv.
15 lt1800 sn1800 1800fs 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. u package descriptio s8 package 8-lead plastic small outline (narrow .150 inch) (reference ltc dwg # 05-08-1610) 0.016 ?0.050 (0.406 ?1.270) 0.010 ?0.020 (0.254 ?0.508) 45 0 ?8 typ 0.008 ?0.010 (0.203 ?0.254) so8 1298 0.053 ?0.069 (1.346 ?1.752) 0.014 ?0.019 (0.355 ?0.483) typ 0.004 ?0.010 (0.101 ?0.254) 0.050 (1.270) bsc 1 2 3 4 0.150 ?0.157** (3.810 ?3.988) 8 7 6 5 0.189 ?0.197* (4.801 ?5.004) 0.228 ?0.244 (5.791 ?6.197) 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 * ** 1.50 ?1.75 (note 4) 2.80 bsc 0.30 ?0.45 typ 5 plcs (note 3) datum ? 0.09 ?0.20 (note 3) s5 tsot-23 0302 pin one 2.90 bsc (note 4) 0.95 bsc 1.90 bsc 0.80 ?0.90 1.00 max 0.01 ?0.10 0.20 bsc 0.30 ?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 s5 package 5-lead plastic tsot-23 (reference ltc dwg # 05-08-1635)
16 lt1800 sn1800 1800fs part number description comments lt1399 triple 300mhz current feedback amplifier 0.1db gain flatness to 150mhz, shutdown lt1498/lt1499 dual/quad 10mhz, 6v m s rail-to-rail input and output c-load tm high dc accuracy, 475 m v v os(max) , 4 m v/ c max drift, op amps max supply current 2.2ma per amp lt1630/lt1631 dual/quad 30mhz, 10v/ m s rail-to-rail input and output op amps high dc accuracy, 525 m v v os(max) , 70ma output current, max supply current 4.4ma per amplifier lt1801/lt1802 80mhz, 25v/ m s low power rail-to-rail input/output precision op amps dual/quad version of the lt1800 lt1806/lt1807 single/dual 325mhz, 140v/ m s rail-to-rail input and output op amps high dc accuracy, 550 m v v os(max) , low noise 3.5nv/ ? hz, low distortion C80db at 5mhz, power-down (lt1806) lt1809/lt1810 single/dual 180mhz rail-to-rail input/output op amps 350v/ m s slew rate, low distortion C90dbc at 5mhz, power-down (lt1809) c-load is a trademark of linear technology corporation. lt/tp 0402 2k ? printed in usa ? linear technology corporation 2001 related parts linear technology corporation 1630 mccarthy blvd., milpitas, ca 95035-7417 (408) 432-1900 l fax: (408) 434-0507 l www.linear.com + lt1800 5v 10k 10k q3 q1 4.99k 1k 1k ?30v 1800 f06 4.99k q5 q7 q2 q4 q6 q8 r1 2k r2 2k r5 2k r4 2k r7 2k r6 2k r3 200k 0.1 m f c1 39pf c2 8pf 150v v out v in material under electric field 100pf 130v 5v 5v a v = v out /v in = ?00 130v supply i q = 130 a output swing = 128.8v output offset @ 20mv output short-circuit current @ 3ma 10% to 90% rise time @ 8 m s, 200v output step small-signal bandwidth @ 150khz q1, q2, q7, q8: on semi mpsa42 q3, q4, q5, q6: on semi mpsa92 figure 6. low power, high voltage amplifier v in 2v/div v out 50v/div 10 m s/div 1800 f07 low power high voltage amplifier certain materials used in optical applications have charac- teristics that change due to the presence and strength of a dc electric field. the voltage applied across these materials should be precisely controlled to maintain de- sired properties, sometimes as high as 100s of volts. the materials are not conductive and represent a capacitive load. the circuit of figure 6 shows the lt1800 used in an amplifier capable of a 250v output swing and providing u typical applicatio precise dc output voltage. when no signal is present, the op amp output sits at about mid-supply. transistors q1 and q3 create bias voltages for q2 and q4, which are forced into a low quiescent current by degeneration resis- tors r4 and r5. when a transient signal arrives at v in , the op amp output moves and causes the current in q2 or q4 to change depending on the signal polarity. the current, limited by the clipping of the lt1800 output and the 3k w of total emitter degeneration, is mirrored to the output devices to drive the capacitive load. the lt1800 output then returns to near mid-supply, providing the precise dc output voltage to the load. the attention to limit the current of the output devices minimizes power dissipation thus allowing for dense layout, and inherits better reliability. figure 7 shows the time domain response of the amplifier providing a 200v output swing into a 100pf load. figure 7. large-signal time domain response of the amplifier
operational amplifiers (op amps) home > products > signal conditioning > operational amplifiers (op amps) > high speed amplifiers > lt1800 high speed amplifiers precision amplifiers zero drift amplifiers low noise amplifiers low power amplifiers low bias current amplifiers high output current amplifiers current feedback amplifiers current sense amplifiers programmable gain amplifiers differential amplifiers instrumentation amplifiers video functions if amplifiers / adc drivers site help site map site index send us feedback ? 2007 linear technology | terms of use | privacy policy search lt1800 - 80mhz, 25v/s low power rail-to-rail input and output precision op amp features gain bandwidth product: 80mhz input common mode range includes both rails output swings rail-to-rail low quiescent current: 2ma max input offset voltage: 350v max input bias current: 250na max low voltage noise: 8.5nv/rthz slew rate: 25v/s common mode rejection: 105db power supply rejection: 97db open-loop gain: 85v/mv available in the 8-pin so and 5-pin low profile (1mm) thinsot? packages operating temperature range: ?40c to 85c typical application order now request samples documentation datasheet lt1800 - 80mhz, 2 5 power rail - to - rail i output precision o p design note dn286 fast and a c 80mhz amplifier d r 2ma lt magazine dec 2001 accurate 80mhz amplifier d r 2ma lt chronicle jun 2003 medical d oct 2003 test and measurement reliability data r378 reliability da t software and simulatio n lt1800 spice mo d pa g e 1 of 4 linear technolo gy - lt1800 - 80mhz, 25v / s low power rail-to-rail in p ut and out p ut... htt p ://www.linear.com/ p c/ p roductdetail. j s p ?navid=h0,c1,c1154,c1009,c1022,p2163
description the lt?1800 is a low power, high speed rail-to-rail input and output operational amplifier with excellent dc performance. the lt1800 features reduced supply current, lower input offset voltage, lower input bias current and higher dc gain than other devices with comparable bandwidth. the lt1800 has an input range that includes both supply rails and an output that swings within 20mv of ei ther supply rail to maximize the signal dynamic range in low supply applications. the lt1800 maintains its performance for supplies from 2.3v to 12.6v and is specified at 3v, 5v and 5v supplies. the inputs can be driven beyond the supplies without damage or phas e reversal of the output. the lt1800 is available in the 8-pin so package with the standard op amp pinout and in the 5-pin sot-23 package. for dual and quad versions of the lt1800, see the lt1801/ lt1802 data sheet. the lt1800 can be used as a plug-in replacement for many op am ps to improve input/output range and performance. packaging so-8,sot23-5 order info part numbers ending in pbf are lead free . please contact ltc marketing for information on lead based finish parts. part numbers containing tr or trm are shipped in tape and reel or 500 unit mini tape and reel , respectively please refer to our general ordering information or the product datasheet for more details package variations and pricing back to top back to top back to top part number package pins temp price (1-99) price (1k) * rohs data lt1800cs5 sot 5 c $1.67 $1.30 view pa g e 2 of 4 linear technolo gy - lt1800 - 80mhz, 25v / s low power rail-to-rail in p ut and out p ut... htt p ://www.linear.com/ p c/ p roductdetail. j s p ?navid=h0,c1,c1154,c1009,c1022,p2163
* the usa list pricing shown is for budgetary use only, shown in united states dollars (fob usa per unit for the stated volume), and is subject to change. international prices may differ due to local duties, taxes, fees and exchange rates. for volume-specific price or delivery quotes, please contact your local linear technology sales office or authorized distributor . applications low voltage, high frequency signal processing driving a/d converters rail-to-rail buffer amplifiers active filters video line driver simulate linear technology offers several options for simulating our high performance operational amplifiers. download the spice model for the lt1800 (or right click and select "save target as" to save the file to disk) download spice models for the complete collection of ltc op amps ltspice / switchercad iii is a powerful free circuit simulator and schematic capture program. included in this download are ltspice, macro models for 80% of linear technology's switching regulators, over 200 op amp models, as well as resistors, transistors and mosfet models. download it now! lt1800cs5#pbf sot 5 c $1.67 $1.35 view lt1800cs5#tr sot 5 c $1.67 $1.30 view lt1800cs5#trm sot 5 c $1.67 $1.32 view lt1800cs5#trmpbf sot 5 c $1.67 $1.32 view lt1800cs5#trpbf sot 5 c $1.67 $1.30 view lt1800cs8 so 8 c $1.60 $1.30 view lt1800cs8#pbf so 8 c $1.60 $1.30 view lt1800cs8#tr so 8 c $1.36 view lt1800cs8#trpbf so 8 c $1.36 view lt1800is5 sot 5 i $1.92 $1.55 view lt1800is5#pbf sot 5 i $1.92 view lt1800is5#tr sot 5 i $1.92 $1.61 view lt1800is5#trm sot 5 i $1.92 $1.63 view lt1800is5#trmpbf sot 5 i $1.92 $1.63 view lt1800is5#trpbf sot 5 i $1.92 $1.61 view lt1800is8 so 8 i $1.85 $1.55 view lt1800is8#pbf so 8 i $1.85 $1.55 view lt1800is8#tr so 8 i $1.61 view lt1800is8#trpbf so 8 i $1.61 view buy now request samples back to top back to top pa g e 3 of 4 linear technolo gy - lt1800 - 80mhz, 25v / s low power rail-to-rail in p ut and out p ut... htt p ://www.linear.com/ p c/ p roductdetail. j s p ?navid=h0,c1,c1154,c1009,c1022,p2163

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