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lt1783 1 1783fd typical application features applications description 1.25mhz, over-the-top micropower, rail-to-rail input and output op amp in sot-23 the lt ? 1783 is a 1.25mhz op amp available in the small sot-23 package that operates on all single and split supplies with a total voltage of 2.5v to 18v. the ampli? er draws less than 300a of quiescent current and has reverse-battery protection, drawing negligible current for reverse supply voltages up to 18v. the input range of the lt1783 includes ground, and a unique feature of this device is its over-the-top ? opera- tion capabilitity with either or both of its inputs above the positive rail. the inputs handle 18v both differential and common mode, independent of supply voltage. the input stage incorporates phase reversal protection to prevent false outputs from occurring even when the inputs are 9v below the negative supply. the lt1783 can drive loads up to 18ma and still maintain rail-to-rail capability. a shutdown feature on the 6-lead version can disable the part, making the output high impedance and reducing quiescent current to 5a. the lt1783 op amp is available in the 5- and 6-lead sot-23 packages. for applications requiring lower power, refer to the lt1782. positive supply rail current sense n operates with inputs above v + n rail-to-rail input and output n micropower: 300a supply current max n operating temperature range: C40c to 125c n gain bandwidth product: 1.25mhz n slew rate: 0.42v/s n low input offset voltage: 800v max n single supply input range: 0v to 18v n high output current: 18ma min n speci? ed on 3v, 5v and 5v supplies n output shutdown on 6-lead version n reverse-battery protection to 18v n high voltage gain: 1500v/mv n low pro? le (1mm) thinsot? package n portable instrumentation n battery- or solar-powered systems n sensor conditioning n supply current sensing n battery monitoring n mux ampli? ers n 4ma to 20ma transmitters distribution of input offset voltage C900 C600 C300 0 300 600 900 percentage of amplifiers input offset voltage (v) 1783 ta01b 2520 15 10 50 v s = 5v, 0v v cm = 2.5v C + lt1783 i load v out = 2(i load ) 0v to 4.3v 2n3904 2k 200 1783 ta01 5v v + 5v to 18v 200 0.2 load l , lt, ltc, ltm, linear technology, the linear logo and over-the-top are registered trademarks of linear technology corporation. thinsot is a trademark of linear technology corporation. all other trademarks are the property of their respective owners. downloaded from: http:///
lt1783 2 1783fd absolute maximum ratings total supply voltage (v + to v C ) ................................ 18v input differential voltage.......................................... 18v input pin voltage to v C ............................... +24v/C10v shutdown pin voltage above v C ............................. 18v shutdown pin current ........................................ 10ma output short-circuit duration (note 2) ........... inde? nite operating temperature range (note 3) lt1783c ............................................. C40c to 85c lt1783i .............................................. C40c to 85c lt1783h ........................................... C40c to 125c (note 1) 4 5 3 1 out v C +in v + Cin top view s5 package 5-lead plastic tsot-23 2 + C t jmax = 150c, ja = 250c/w 1 2 3 65 4 top view s6 package 6-lead plastic tsot-23 out v C +in v + shdnCin + C t jmax = 150c, ja = 230c/w pin configuration order information tape and reel (mini) tape and reel part marking package description specified temperature range lt1783cs5#trmpbf lt1783cs5#trpbf ltlf 5-lead plastic sot-23 0c to 70c lt1783is5#trmpbf lt1783is5#trpbf ltlg 5-lead plastic sot-23 C40c to 85c lt1783hs5#trmpbf lt1783hs5#trpbf ltxr 5-lead plastic sot-23 C40c to 125c lt1783cs6#trmpbf lt1783cs6#trpbf ltiu 6-lead plastic sot-23 0c to 70c lt1783is6#trmpbf lt1783is6#trpbf ltiv 6-lead plastic sot-23 C40c to 85c lt1783hs6#trmpbf lt1783hs6#trpbf ltxs 6-lead plastic sot-23 C40c to 125c trm = 500 pieces. *temperature grades are identi? ed by a label on the shipping container. consult ltc marketing for parts speci? ed with wider operating temperature ranges. consult ltc marketing for information on lead based ? nish parts. 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/ speci? ed temperature range (note 4) lt1783c ............................................. C40c to 85c lt1783i .............................................. C40c to 85c lt1783h ........................................... C40c to 125c junction temperature ......................................... 150c storage temperature range .................. C65c to 150c lead temperature (soldering, 10 sec) ................. 300c downloaded from: http:///
lt1783 3 1783fd electrical characteristics the l denotes the speci? cations which apply over the speci? ed temperature range, otherwise speci? cations are at t a = 25c. v s = 3v, 0v; v s = 5v, 0v; v cm = v out = half supply, for the 6-lead part v pin5 = 0v, pulse power tested unless otherwise speci? ed. (note 4) conditions lt1783c/lt1783i symbol parameter min typ max units v os input offset voltage t a = 25c 0c t a 70c C40c t a 85c ll 400 800 950 1100 vv v input offset voltage drift (note 9) l 25 v / c i os input offset current v cm = 18v (note 5) ll 48 7 naa i b input bias current v cm = 18v (note 5) shdn or v s = 0v, v cm = 0v to 18v ll 4535 0.1 8060 naa na input bias current drift l 0.06 na/c input noise voltage 0.1hz to 10hz 0.6 v p-p e n input noise voltage density f = 1khz 20 nv/ hz i n input noise current density f = 1khz 0.14 pa/ hz r in input resistance differential common mode, v cm = 0v to (v cc C 1v) common mode, v cm = 0v to 18v ll 0.65 0.3 1.3 1 0.5 m g m c in input capacitance 5p f input voltage range l 01 8 v cmrr common mode rejection ratio (note 5) v cm = 0v to v cc C 1v v cm = 0v to 18v (note 8) ll 9068 100 80 dbdb psrr power supply rejection ratio v s = 3v to 12.5v, v cm = v o = 1v l 90 100 db a vol large-signal voltage gain v s = 3v, v o = 500mv to 2.5v, r l = 10k v s = 3v, 0c t a 70c v s = 3v, C40c t a 85c ll 200133 100 1500 v/mv v/mv v/mv v s = 5v, v o = 500mv to 4.5v, r l = 10k v s = 5v, 0c t a 70c v s = 5v, C40c t a 85c ll 400250 200 1500 v/mv v/mv v/mv v ol output voltage swing low no load i sink = 5ma v s = 5v, i sink = 10ma ll l 3 200330 8 400600 mvmv mv v oh output voltage swing high v s = 3v, no load v s = 3v, i source = 5ma ll 2.91 2.6 2.94 2.8 vv v s = 5v, no load v s = 5v, i source = 10ma ll 4.91 4.5 4.944.74 vv i sc short-circuit current (note 2) v s = 3v, short to gnd v s = 3v, short to v cc 5 15 1030 mama v s = 5v, short to gnd v s = 5v, short to v cc 1520 3040 mama minimum supply voltage l 2.5 2.7 v reverse supply voltage i s = C100a l 18 v i s supply current (note 6) 0c t a 70c C40c t a 85c ll 210 300 350375 aa a supply current, shdn v pin5 = 2v, no load (note 10) l 51 8 a i shdn shutdown pin current v pin5 = 0.3v, no load (note 10) v pin5 = 2v, no load (note 10) v pin5 = 5v, no load (note 10) ll 0.5 25 8 naa a shutdown output leakage current v pin5 = 2v, no load (note 10) l 0.05 1 a maximum shutdown pin current v pin5 = 18v, no load (note 10) l 10 30 a downloaded from: http:///
lt1783 4 1783fd electrical characteristics the l denotes the speci? cations which apply over the speci? ed temperature range, otherwise speci? cations are at t a = 25c. v s = 3v, 0v; v s = 5v, 0v; v cm = v out = half supply, for the 6-lead part v pin5 = 0v, pulse power tested unless otherwise speci? ed. (note 4) conditions lt1783c/lt1783i symbol parameter min typ max units v l shutdown pin input low voltage (note 10) l 0.3 v v h shutdown pin input high voltage (note 10) l 2v t on turn-on time v pin5 = 5v to 0v, r l = 10k (note 10) 25 s t off turn-off time v pin5 = 0v to 5v, r l = 10k (note 10) 3 s gbw gain bandwidth product (note 5) f = 5khz0c t a 70c C40c t a 85c ll 750600 550 1250 khz khzkhz sr slew rate (note 7) a v = C1, r l = 0c t a 70c C40c t a 85c ll 0.240.21 0.19 0.42 v/s v/s v/s fpbw full-power bandwidth (note 11) v out = 2v p-p 66 khz t s settling time v s = 5v, ? v out = 2v to 0.1%, a v = C1 12 s thd distortion v s = 3v, v o = 2v p-p , a v = 1, r l = 10k, f = 1khz 0.001 % the l denotes the speci? cations which apply over the speci? ed temperature range, otherwise speci? cations are at t a = 25c. v s = 5v, v cm = 0v, v out = 0v, for the 6-lead part v pin5 = v C , pulse power tested unless otherwise speci? ed. (note 4) symbol parameter conditions lt1783c/lt1783i units min typ max v os input offset voltage t a = 25c 0c t a 70c C40c t a 85c ll 500 900 10501200 vv v input offset voltage drift (note 9) l 25 v / c i os input offset current l 48 n a i b input bias current l 40 80 na input bias current drift l 0.06 na/c input noise voltage 0.1hz to 10hz 1 v p-p e n input noise voltage density f = 1khz 20 nv/ hz i n input noise current density f = 1khz 0.14 pa/ hz r in input resistance differential common mode, v cm = C5v to 13v ll 0.65 0.3 1.30.5 mm c in input capacitance 5p f input voltage range l C5 13 v cmrr common mode rejection ratio v cm = C5v to 13v l 68 80 db a vol large-signal voltage gain v o = 4v, r l = 10k 0c t a 70c C40c t a 85c ll 7050 40 160 v/mv v/mv v/mv v ol output voltage swing low no load i sink = 5ma i sink = 10ma ll l C4.997 C4.8 C4.67 C4.992 C4.6C4.4 vv v v oh output voltage swing high no load i source = 5ma i source = 10ma ll l 4.91 4.64.5 4.94 4.8 4.74 vv v i sc short-circuit current (note 2) short to gnd 0c t a 70c l 1815 30 ma ma psrr power supply rejection ratio v s = 1.5v to 9v l 90 100 db downloaded from: http:///
lt1783 5 1783fd electrical characteristics the l denotes the speci? cations which apply over the speci? ed temperature range, otherwise speci? cations are at t a = 25c. v s = 5v, v cm = 0v, v out = 0v, for the 6-lead part v pin5 = v C , pulse power tested unless otherwise speci? ed. (note 4) symbol parameter conditions lt1783c/lt1783i units min typ max i s supply current 0c t a 70c C40c t a 85c ll 230 325 375400 aa a supply current, shdn v pin5 = C3v, v s = 5v, no load (note 10) l 62 0 a i shdn shutdown pin current v pin5 = C4.7v, v s = 5v, no load (note 10) v pin5 = C3v, v s = 5v, no load (note 10) l 0.5 28 naa maximum shutdown pin current v pin5 = 9v, v s = 9v (note 10) l 10 30 a shutdown output leakage current v pin5 = C7v, v s = 9v, no load (note 10) l 0.05 1 a v l shutdown pin input low voltage v s = 5v (note 10) l C4.7 v v h shutdown pin input high voltage v s = 5v (note 10) l C2.8 v t on turn-on time v pin5 = 0v to C5v, r l = 10k (note 10) l 25 s t off turn-off time v pin5 = C5v to 0v, r l = 10k (note 10) l 3 s gbw gain bandwidth product f = 5khz 0c t a 70c C40c t a 85c ll 800700 625 1300 khz khzkhz sr slew rate a v = C1, r l = , v o = 4v, measured at v o = 2v 0c t a 70c C40c t a 85c ll 0.260.23 0.21 0.45 v/s v/s v/s fpbw full-power bandwidth (note 11) v out = 8v p-p 18 khz t s settling time ? v out = 4v to 0.1%, a v = 1 10 s the l denotes the speci? cations which apply over the full operating temperature range of C40c t a 125c. v s = 3v, 0v; v s = 5v, 0v; v cm = v out = half supply, for the 6-lead part v pin5 = 0v, pulse power tested unless otherwise speci? ed. (note 4) symbol parameter conditions lt1783h units min typ max v os input offset voltage l 400 850 3 v mv input offset voltage drift (note 9) l 15 v/c i os input offset current v cm = 18v (note 5) ll 1510 naa i b input bias current v cm = 18v (note 5) ll 150150 naa input voltage range l 0.3 18 v cmrr common mode rejection ratio v cm = 0.3v to v cc C 1v v cm = 0.3v to 18v ll 7660 dbdb a vol large-signal voltage gain v s = 3v, v o = 500mv to 2.5v, r l = 10k l 200 50 1500 v/mv v/mv v s = 5v, v o = 500mv to 4.5v, r l = 10k l 400100 1500 v/mv v/mv v ol output voltage swing low no load i sink = 5ma v s = 5v, i sink = 10ma ll l 15 800 1200 mvmv mv v oh output voltage swing high v s = 3v, no load v s = 3v, i source = 5ma ll 2.852.30 vv v s = 5v, no load v s = 5v, i source = 10ma ll 4.85 4 vv psrr power supply rejection ratio v s = 3v to 12.5v, v cm = v o = 1v l 80 db downloaded from: http:///
lt1783 6 1783fd electrical characteristics the l denotes the speci? cations which apply over the full operating temperature range of C40c t a 125c. v s = 3v, 0v; v s = 5v, 0v; v cm = v out = half supply, for the 6-lead part v pin5 = 0v, pulse power tested unless otherwise speci? ed. (note 4) symbol parameter conditions lt1783h units min typ max minimum supply voltage l 2.7 v reverse supply voltage i s = C100a l 18 v i s supply current l 210 300 600 aa supply current, shdn v pin5 = 2v, no load (note 10) l 25 a i shdn shutdown pin current v pin5 = 0.3v, no load (note 10) v pin5 = 2v, no load (note 10) ll 0.5 12 naa output leakage current v pin5 = 2v, no load (note 10) l 2.5 a maximum shutdown pin current v pin5 = 18v, no load (note 10) l 40 a gbw gain bandwidth product f = 5khz (note 5) l 750400 1250 khz khz sr slew rate a v = C1, r l = (note 7) l 0.240.12 0.42 v/s v/s the l denotes the speci? cations which apply over the full operating temperature range of C40c t a 125c. v s = 5v, v cm = 0v, v out = 0v, v shdn = v C , t a = C40c to 125c, for the 6-lead part v pin5 = v C , pulse power tested unless otherwise speci? ed. (note 4) symbol parameter conditions lt1783h units min typ max v os input offset voltage l 500 950 3.1 v mv input offset voltage drift (note 9) l 15 v/c i os input offset current l 15 na i b input bias current l 150 na cmrr common mode rejection ratio v cm = C4.7v to 13v l 60 db a vol large-signal voltage gain v o = 4v, r l = 10k l 7010 160 v/mv v/mv v o output voltage swing no load i out = 5ma i out = 10ma ll l 4.854.20 3.80 vv v psrr power supply rejection ratio v s = 1.5v to 9v l 80 db minimum supply voltage l 1.35 v i s supply current l 230 325 650 aa supply current, shdn v pin5 = C3v, v s = 5v, no load (note 10) l 25 a i shdn shutdown pin current v pin5 = C4.7v, v s = 5v, no load (note 10) v pin5 = C3v, v s = 5v, no load (note 10) ll 0.5 12 naa maximum shutdown pin current v pin5 = 9v, v s = 9v (note 10) l 45 a output leakage current v pin5 = C7v, v s = 9v, no load l 3 a v l shutdown pin input low voltage v s = 5v l C4.7 v v h shutdown pin input high voltage v s = 5v l C2.8 v gbw gain bandwidth product f = 5khz l 800425 1300 khz khz sr slew rate a v = C1, r l = , v o = 4v measured at v o = 2v l 0.260.14 0.45 v/s v/s downloaded from: http:///
lt1783 7 1783fd 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: a heat sink may be required to keep the junction temperature below absolute maximum.note 3: the lt1783c and lt1873i are guaranteed functional over the operating temperature range of C40c to 85c. the lt1783h is guaranteed functional over the operating temperature range of C40c to 125c. note 4: the lt1783c is guaranteed to meet speci? ed performance from 0c to 70c. the lt1783c is designed, characterized and expected to meet speci? ed performance from C40c to 85c but is not tested or qa sampled at these temperatures. the lt1783i is guaranteed to meet speci? ed performance from C40c to 85c. the lt1783h is guaranteed to meet speci? ed performance from C40c to 125c. note 5: v s = 5v limits are guaranteed by correlation to v s = 3v and v s = 5v or v s = 9v tests. note 6: v s = 3v limits are guaranteed by correlation to v s = 5v and v s = 5v or v s = 9v tests. note 7: guaranteed by correlation to slew rate at v s = 5v, and gbw at v s = 3v and v s = 5v tests. note 8: this speci? cation implies a typical input offset voltage of 1.8mv at v cm = 18v and a maximum input offset voltage of 7.2mv at v cm = 18v. note 9: this parameter is not 100% tested. note 10: speci? cations apply to 6-lead sot-23 with shutdown. note 11: full-power bandwidth is calculated from the slew rate: fpbw = sr/2v p . typical performance characteristics supply current vs supply voltage minimum supply voltage output voltage vs large input voltage input bias current vs common mode voltage output saturation voltage vs load current (output high) output saturation voltage vs load current (output low) supply voltage (v) 2 6 10 14 4 8 12 16 18 supply current (a) 1783 g01 300280 260 240 220 200 180 160 140 120 t a = 125c t a = 25c t a = C55c total supply voltage (v) 0 1 2 3 4 5 input offset voltage change (v) 1783 g02 400300 200 100 0 C100C200 C300 C400 t a = 125c t a = C55c t a = 25c v in (v) C10 C8 6 8 10 12 14 16 18 v out (v) 1783 g03 54 3 2 1 0 v s = 5v, 0v C6 C4 0 2 C2 4 v in 5v C + common mode voltage (v) 3.8 4 4.2 4.4 4.6 4.8 5 5.2 5.4 5.6 14 16 18 input bias current (na) 1783 g04 5000040000 30000 20000 10000 250200 150 100 50 0 C50 t a = 25c t a = C55c t a = 125c sourcing load current (a) 1 0.01 output saturation voltage (v) 0.1 1 100 10 1m 10m 1783 g05 t a = 125c v s = 2.5v v od = 30mv t a = C55c t a = 25c sinking load current (a) 0.01 output saturation voltage (v) 0.1 1 100 1m 10m 1783 g06 0.001 10 1 t a = C55c t a = 125c t a = 25c v s = 2.5v v od = 30mv downloaded from: http:///
lt1783 8 1783fd typical performance characteristics output saturation voltage vs input overdrive output short-circuit current vs temperature 0.1hz to 10hz noise voltage noise voltage density vs frequency input noise current vs frequency gain and phase shift vs frequency gain bandwidth product vs temperature slew rate vs temperature input overdrive (mv) 0 output saturation voltage (mv) 100 10 1 1783 g07 10 20 30 40 50 60 output high v s = 2.5v no load output low temperature (c) C50 C25 0 25 50 75 100 125 output current (ma) 1783 g08 5550 45 40 35 30 v s = 5v sinking current sourcing current time (sec) noise voltage (400nv/div) 1783 g09 v s = 2.5v 012345678910 frequency (hz) input noise voltage density (nv/ hz ) 7060 50 40 30 20 10 1 100 1k 10k 1783 g10 10 v s = 2.5v frequency (hz) input noise current density (pa/ hz ) 3.02.5 2.0 1.5 1.0 0.5 0 1 100 1k 10k 1783 g11 10 v s = 2.5v frequency (hz) 1k gain (db) 7060 50 40 30 20 10 0 C10C20 C30 phase shift (deg) 120100 80 60 40 20 0 C20 C40 C60 C80 10k 100k 1m 10m 1783 g12 v s = 2.5v phase gain temperature (c) C50 C25 0 25 50 75 100 125 gain bandwidth (khz) 1783 g13 14001350 1300 1250 1200 1150 1100 f = 5khzv s = 2.5v temperature (c) C50 C25 0 25 50 75 100 125 slew rate (v/s) 1783 g14 0.80.7 0.6 0.5 0.4 0.3 0.2 v s = 5v rising falling downloaded from: http:///
lt1783 9 1783fd typical performance characteristics gain bandwidth product and phase margin vs supply voltage gain bandwidth and phase margin vs load resistance psrr vs frequency cmrr vs frequency output impedance vs frequency disabled output impedance vs frequency (note 8) settling time to 0.1% vs output step capacitive load handling overshoot vs capacitive load total supply voltage (v) 0 2 4 6 8 10 12 14 16 18 gain baindwidth product (khz) phase margin (deg) 1783 g15 13001250 1200 6560 55 a v = C1 r f = r g = 10k f = 5khz phase margin gain bandwidth product load resistance () 1k 14001200 1000 800 6560 55 10k 100k 1783 g16 v s = 2.5v a v = C1 r f = r g = 10k f = 5khz phase margin gain bandwidth product gain baindwidth product (khz) phase margin (deg) frequency (hz) 1k power supply rejection ratio (db) 9080 70 60 50 40 30 20 10 0 C10 10k 100k 1m 1783 g17 v s = 2.5v positive supply negative supply frequency (hz) 10k common mode rejection ratio (db) 110100 9080 70 60 50 40 30 100k 1m 1783 g18 v s = 2.5v frequency (hz) 100 0.01 output impedance () 100 10k 1k 100k 1m 1783 g19 10 1 0.1 a v = 100 v s = 2.5v a v = 10 a v = 1 frequency (hz) 100 100 output impedance () 10k 1m 1k 10k 100k 1m 1783 g20 1k 100k v s = 2.5v v pin5 (shutdown) = 2.5v settling time (s) 0 2 4 6 8 10 12 14 16 18 20 output step (v) 1783 g21 43 2 1 0 C1C2 C3 C4 a v = 1 v s = 5v a v = C1 a v = 1 a v = C1 capacitive load (pf) 10 overshoot (%) 4035 30 25 20 15 10 50 100 1000 10000 1783 g22 v s = 5v, 0v v cm = 2.5v a v = 1 a v = 5 a v = 10 downloaded from: http:///
lt1783 10 1783fd typical performance characteristics undistorted output swing vs frequency total harmonic distortion + noise vs frequency total harmonic distortion + noise vs output voltage amplitude open-loop gain supply current vs shdn pin voltage large-signal response small-signal response frequency (hz) 100 1k 10k 100k output swing (v p-p ) 1210 86 4 2 0 1783 g23 v s = 2.5v distortion 1%a v = 1 v s = 5v frequency (hz) 0.010 thd + noise (%) 0.1 10 10k 1k 100k 1783 g24 0.001 0.0001 100 1 a v = C1 v s = 3v, 0v v out = 2v p-p v cm = 1.2v r l = 10k a v = 1 total harmonic distortion + noise vs load resistance load resistance to ground () 0.01 thd + noise (%) 0.1 100 100k 1783 g25 0.001 0.0001 1k 10k 1 v s = 3v total a v = 1 v in = 2v p-p at 1khz v s = 1.5v v in = 1v v s = 3v, 0v v in = 0.5v to 2.5v v s = 3v, 0v v in = 0.2v to 2.2v output voltage amplitude (v p-p ) 0.1 thd + noise (%) 1 0123 1783 g26 0.01 0.001 10 a v = C1 r f = r g = 100k v s = 1.5v v cm = 0v a v = 1 v s = 1.5v v cm = 0v a v = C1 r f = r g = 100k v s = 3v, 0v v cm = 1.5v a v = 1 v s = 3v, 0v v cm = 1.5v output voltage (v) C 6C 4C 20246 C5 C3 C1 1 3 5 input offset voltage change (50v/div) 1783 g27 r l = 2k v s = 5v r l = 10k r l = 50k shutdown pin voltage (v) 0 0.5 1 1.5 2 2.5 supply current per amplifier (a) 1783 g28 275250 225 200 175 150 125 100 7550 25 0 t a = 25c t a = C55c t a = 125c v s = 5v, 0v v s = 5v a v = 1 c l = 15pf 1783 g29 v s = 5v a v = 1 c l = 15pf 1783 g30 downloaded from: http:///
lt1783 11 1783fd applications information supply voltage the positive supply pin of the lt1783 should be bypassed with a small capacitor (typically 0.1f) within an inch of the pin. when driving heavy loads, an additional 4.7f electrolytic capacitor should be used. when using split supplies, the same is true for the negative supply pin. the lt1783 is protected against reverse-battery voltages up to 18v. in the event a reverse-battery condition occurs, the supply current is less than 1na. inputs the lt1783 has two input stages, npn and pnp (see the simpli? ed schematic), resulting in three distinct operating regions as shown in the input bias current vs common mode typical performance curve. for input voltages about 0.8v or more below v + , the pnp input stage is active and the input bias current is typically C40na. when the input common mode voltage is within 0.5v of the positive rail, the npn stage is operating and the input bias current is typically 80na. increases in tem- perature will cause the voltage at which operation switches from the pnp input stage to the npn input stage to move towards v + . the input offset voltage of the npn stage is untrimmed and is typically 1.8mv. a schottky diode in the collector of the input transistors, along with special geometries for these npn transistors, allow the lt1783 to operate with either or both of its inputs above v + . at about 0.3v above v + , the npn input transistor is fully saturated and the input bias current is typically 30a at room temperature. the input offset voltage is typically 1.8mv when operating above v + . the lt1783 will operate with its inputs 18v above v C regardless of v + . the inputs are protected against excursions as much as 10v below v C by an internal 1k resistor in series with each input and a diode from the input to the negative supply. the input stage of the lt1783 incorporates phase reversal protection to prevent the output from phase reversing for inputs up to 9v below v C . there are no clamping diodes between the inputs and the maximum differential input voltage is 18v. output the output of the lt1783 can swing to within 60mv of the positive rail with no load and within 3mv of the negative rail with no load. when monitoring input voltages within 60mv of the positive rail or within 3mv of the negative rail, gain should be taken to keep the output from clipping. the lt1783 can sink and source over 30ma at 5v supplies, sourcing current is reduced to 10ma at 3v total supplies as noted in the electrical characteristics. the lt1783 is internally compensated to drive at least 400pf of capacitance under any output loading condi- tions. a 0.22f capacitor in series with a 150 resistor between the output and ground will compensate these ampli? ers for larger capacitive loads, up to 10,000pf, at all output currents. distortion there are two main contributors to distortion in op amps: output crossover distortion as the output transitions from sourcing to sinking current, and distortion caused by non- linear common mode rejection. if the op amp is operating inverting, there is no common mode induced distortion. if the op amp is operating in the pnp input stage (input is not within 0.8v of v + ), the cmrr is very good, typically 100db. when the lt1783 switches between input stages, there is signi? cant nonlinearity in the cmrr. lower load resistance increases the output crossover distortion but has no effect on the input stage transition distortion. for lowest distortion, the lt1783 should be operated single supply, with the output always sourcing current and with the input voltage swing between ground and (v + C 0.8v). see the typical performance characteristics curves, total harmonic distortion + noise vs output voltage amplitude. downloaded from: http:///
lt1783 12 1783fd simplified schematic gainthe open-loop gain is almost independent of load when the output is sourcing current. this optimizes performance in single supply applications where the load is returned to ground. the typical performance curve of open-loop gain for various loads shows the details. shutdownthe 6-lead part includes a shutdown feature that disables the part, reducing quiescent current and making the output high impedance. the part can be shut down by bringing the shdn pin 1.2v or more above v C . when shut down, the supply current is about 5a and the output leakage current is less than 1a (v C v out v + ). in normal opera- tion, the shdn pin can be tied to v C or left ? oating. see the typical performance characteristics curves, supply current vs shutdown voltage. q10 d5 q9 q1 q7 r2 1k r3 1k r48k q8 q5 Cin+in q11 q12 d4 q2 d1 q6 q13 q14 r16k r58k q4 q15 q19 d3 q3 q16 q18 q22 v + q17 q20 q21 out v C 1783 ss shdn 10a + q23 q24 q25 q26 j1 applications information downloaded from: http:///
lt1783 13 1783fd typical application protected fault conditions 1783 ta02 C18v 24v v + v + 5v ok! ok! + 18v 5v 10v 5v ok! ok! + + reverse battery input overvoltage input differential voltage inputs below ground lt1783 lt1783 lt1783 lt1783 downloaded from: http:///
lt1783 14 1783fd package description s5 package 5-lead plastic tsot-23 (reference ltc dwg # 05-08-1635) 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 downloaded from: http:///
lt1783 15 1783fd information furnished by linear technology corporation is believed to be accurate and reliable. however, no responsibility is assumed for its use. linear technology corporation makes no representa- tion that the interconnection of its circuits as described herein will not infringe on existing patent rights. package description s6 package 6-lead plastic tsot-23 (reference ltc dwg # 05-08-1636) 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 downloaded from: http:///
lt1783 16 1783fd 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 0609 rev d printed in usa related parts typical application current source C + lt1783 r1 lt1634-1.25 1783 ta03 v cc i out = 2n3906 1.25v r1 part number description comments lt1782 micropower, over-the-top sot-23 rail-to-rail input and output op amp sot-23 package, micropower 40a per ampli? er, rail-to-rail input and output, 200khz gbw lt1490/lt1491 dual/quad over-the-top micropower rail-to-rail input and output op amps single supply input range: C0.4v to 44v, micropower 50a per ampli? er, rail-to-rail input and output , 200khz gbw lt1636 single over-the-top micropower rail-to-rail input and output op amp 55a supply current, v cm extends 44v above v ee , independent of v cc , msop package, shutdown function lt1638/lt1639 dual/quad, 1.2mhz, 0.4v/s, over-the-top micropower rail-to-rail input and output op amps 170a supply current, single supply input range: C0.4v to 44v, rail-to-rail input and output downloaded from: http:///

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