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1 lt1783 n operates with inputs above v + n rail-to-rail input and output n micropower: 300 m a supply current max n operating temperature range: C 40 c to 125 c n low profile (1mm) thinsot tm package n gain bandwidth product: 1.25mhz n slew rate: 0.42v/ m s n low input offset voltage: 800 m v max n single supply input range: 0v to 18v n high output current: 18ma min n specified 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 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 amplifier draws less than 300 m a 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 tm 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 5 m a. the lt1783 op amp is available in the 5- and 6-lead sot-23 packages. for applications requiring lower power, refer to the lt1782. n portable instrumentation n battery- or solar-powered systems n sensor conditioning n supply current sensing n battery monitoring n mux amplifiers n 4ma to 20ma transmitters 1.25mhz, over-the-top micropower, rail-to-rail input and output op amp in sot-23 , ltc and lt are registered trademarks of linear technology corporation. thinsot and over-the-top are trademarks of linear technology corporation. + 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 positive supply rail current sense distribution of input offset voltage 900 600 300 0 300 600 900 percentage of amplifiers input offset voltage ( v) 1782 g25 25 20 15 10 5 0 v s = 5v, 0v v cm = 2.5v features descriptio u applicatio s u typical applicatio u
2 lt1783 total supply voltage (v + to v C ) .............................. 18v input differential voltage ........................................ 18v input pin voltage to v C ............................... + 24v/C 10v shutdown pin voltage above v C ............................ 18v shutdown pin current ....................................... 10ma output short-circuit duration (note 2) ........... indefinite operating temperature range (note 3) lt1783c ............................................ C 40 c to 85 c lt1783i ............................................. C 40 c to 85 c lt1783h ......................................... C 40 c to 125 c (note 1) lt1783cs5 LT1783IS5 lt1783hs5 t jmax = 150 c, q ja = 250 c/ w order part number order part number t jmax = 150 c, q ja = 230 c/ w s5 part marking s6 part marking 4 5 3 1 out v +in v + ?n top view s5 package 5-lead plastic sot-23 2 + 1 2 3 6 5 4 top view s6 package 6-lead plastic sot-23 out v +in v + shdn ?n + ltlf ltlg ltxr lt1783cs6 lt1783is6 lt1783hs6 ltiu ltiv ltxs specified temperature range (note 4) lt1783c ............................................ C 40 c to 85 c lt1783i ............................................. C 40 c to 85 c lt1783h ......................................... C 40 c to 125 c junction temperature........................................... 150 c storage temperature range ................ C 65 c to 150 c lead temperature (soldering, 10 sec)................. 300 c absolute axi u rati gs w ww u package/order i for atio uu w consult factory for parts specified with wider operating temperature ranges. lt1783c/lt1783i symbol parameter conditions min typ max units v os input offset voltage t a = 25 c 400 800 m v 0 c t a 70 c l 950 m v C40 c t a 85 c l 1100 m v input offset voltage drift (note 9) l 25 m v/ c i os input offset current l 48 na v cm = 18v (note 5) l 7 m a i b input bias current l 45 80 na v cm = 18v (note 5) l 35 60 m a shdn or v s = 0v, v cm = 0v to 18v 0.1 na input bias current drift l 0.06 na/ c input noise voltage 0.1hz to 10hz 0.6 m 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 the l denotes specifications which apply over the specified temperature range, otherwise specifications are t a = 25 c. 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 specified. (note 4) electrical characteristics
3 lt1783 the l denotes specifications which apply over the specified temperature range, otherwise specifications are t a = 25 c. 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 specified. (note 4) lt1783c/lt1783i symbol parameter conditions min typ max units r in input resistance differential l 0.65 1.3 m w common mode, v cm = 0v to (v cc C 1v) 1 g w common mode, v cm = 0v to 18v l 0.3 0.5 m w c in input capacitance 5pf input voltage range l 018v cmrr common mode rejection ratio v cm = 0v to v cc C 1v l 90 100 db (note 5) v cm = 0v to 18v (note 8) l 68 80 db 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 200 1500 v/mv v s = 3v, 0 c t a 70 c l 133 v/mv v s = 3v, C 40 c t a 85 c l 100 v/mv v s = 5v, v o = 500mv to 4.5v, r l = 10k 400 1500 v/mv v s = 5v, 0 c t a 70 c l 250 v/mv v s = 5v, C 40 c t a 85 c l 200 v/mv v ol output voltage swing low no load l 38 mv i sink = 5ma l 200 400 mv v s = 5v, i sink = 10ma l 330 600 mv v oh output voltage swing high v s = 3v, no load l 2.91 2.94 v v s = 3v, i source = 5ma l 2.6 2.8 v v s = 5v, no load l 4.91 4.94 v v s = 5v, i source = 10ma l 4.5 4.74 v i sc short-circuit current (note 2) v s = 3v, short to gnd 5 10 ma v s = 3v, short to v cc 15 30 ma v s = 5v, short to gnd 15 30 ma v s = 5v, short to v cc 20 40 ma minimum supply voltage l 2.5 2.7 v reverse supply voltage i s = C100 m a l 18 v i s supply current 210 300 m a (note 6) 0 c t a 70 c l 350 m a C40 c t a 85 c l 375 m a supply current, shdn v pin5 = 2v, no load (note 10) l 518 m a i shdn shutdown pin current v pin5 = 0.3v, no load (note 10) l 0.5 na v pin5 = 2v, no load (note 10) l 28 m a v pin5 = 5v, no load (note 10) 5 m a shutdown output leakage current v pin5 = 2v, no load (note 10) l 0.05 1 m a maximum shutdown pin current v pin5 = 18v, no load (note 10) l 10 30 m a 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 m s t off turn-off time v pin5 = 0v to 5v, r l = 10k (note 10) 3 m s gbw gain bandwidth product f = 5khz 750 1250 khz (note 5) 0 c t a 70 c l 600 khz C40 c t a 85 c l 550 khz electrical characteristics
4 lt1783 lt1783c/lt1783i symbol parameter conditions min typ max units v os input offset voltage t a = 25 c 500 900 m v 0 c t a 70 c l 1050 m v C40 c t a 85 c l 1200 m v input offset voltage drift (note 9) l 25 m v/ c i os input offset current l 48 na 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 m 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 l 0.65 1.3 m w common mode, v cm = C5v to 13v l 0.3 0.5 m w c in input capacitance 5pf 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 70 160 v/mv 0 c t a 70 c l 50 v/mv C40 c t a 85 c l 40 v/mv v ol output voltage swing low no load l C4.997 C4.992 v i sink = 5ma l C4.8 C4.6 v i sink = 10ma l C4.67 C4.4 v v oh output voltage swing high no load l 4.91 4.94 v i source = 5ma l 4.6 4.8 v i source = 10ma l 4.5 4.74 v i sc short-circuit current (note 2) short to gnd 18 30 ma 0 c t a 70 c l 15 ma psrr power supply rejection ratio v s = 1.5v to 9v l 90 100 db i s supply current 230 325 m a 0 c t a 70 c l 375 m a C40 c t a 85 c l 400 m a supply current, shdn v pin5 = C3v, v s = 5v, no load (note 10) l 620 m a i shdn shutdown pin current v pin5 = C4.7v, v s = 5v, no load (note 10) l 0.5 na v pin5 = C3v, v s = 5v, no load (note 10) l 28 m a the l denotes specifications which apply over the specified temperature range, otherwise specifications are t a = 25 c. 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 specified. (note 4) electrical characteristics lt1783c/lt1783i symbol parameter conditions min typ max units sr slew rate a v = C1, r l = 0.24 0.42 v/ m s (note 7) 0 c t a 70 c l 0.21 v/ m s C40 c t a 85 c l 0.019 v/ m s fpbw full-power bandwidth (note 11) v out = 2v p-p 66 khz t s settling time v s = 5v, d v out = 2v to 0.1%, a v = C1 12 m s thd distortion v s = 3v, v o = 2v p-p , a v = 1, r l = 10k, f = 1khz 0.001 % the l denotes specifications which apply over the specified temperature range, otherwise specifications are t a = 25 c. v s = 5v, v cm = 0v, v out = 0v, for the 6-lead part v pin5 = v C , pulse power tested unless otherwise specified. (note 4)
5 lt1783 electrical characteristics the l denotes specifications which apply over the specified temperature range, otherwise specifications are t a = 25 c. v s = 5v, v cm = 0v, v out = 0v, for the 6-lead part v pin5 = v C , pulse power tested unless otherwise specified. (note 4) lt1783c/lt1783i symbol parameter conditions min typ max units maximum shutdown pin current v pin5 = 9v, v s = 9v (note 10) l 10 30 m a shutdown output leakage current v pin5 = C7v, v s = 9v, no load (note 10) l 0.05 1 m 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 m s t off turn-off time v pin5 = C5v to 0v, r l = 10k (note 10) l 3 m s gbw gain bandwidth product f = 5khz 800 1300 khz 0 c t a 70 c l 700 khz C40 c t a 85 c l 625 khz sr slew rate a v = C1, r l = , v o = 4v, measured at v o = 2v 0.26 0.45 v/ m s 0 c t a 70 c l 0.23 v/ m s C40 c t a 85 c l 0.21 v/ m s fpbw full-power bandwidth (note 11) v out = 8v p-p 18 khz t s settling time d v out = 4v to 0.1%, a v = 1 10 m s the l denotes specifications which apply over the full operating temperature range of C40 c t a 125 c. 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 specified. (note 4) lt1783h symbol parameter conditions min typ max units v os input offset voltage 400 850 m v l 3mv input offset voltage drift (note 9) l 15 m v/ c i os input offset current l 15 na v cm = 18v (note 5) l 10 m a i b input bias current l 150 na v cm = 18v (note 5) l 150 m a input voltage range l 0.3 18 v cmrr common mode rejection ratio v cm = 0.3v to v cc C 1v l 76 db v cm = 0.3v to 18v l 60 db a vol large-signal voltage gain v s = 3v, v o = 500mv to 2.5v, r l = 10k 200 1500 v/mv l 50 v/mv v s = 5v, v o = 500mv to 4.5v, r l = 10k 400 1500 v/mv l 100 v/mv v ol output voltage swing low no load l 15 mv i sink = 5ma l 800 mv v s = 5v, i sink = 10ma l 1200 mv v oh output voltage swing high v s = 3v, no load l 2.85 v v s = 3v, i source = 5ma l 2.30 v v s = 5v, no load l 4.85 v v s = 5v, i source = 10ma l 4v psrr power supply rejection ratio v s = 3v to 12.5v, v cm = v o = 1v l 80 db minimum supply voltage l 2.7 v reverse supply voltage i s = C100 m a l 18 v
6 lt1783 electrical characteristics the l denotes specifications which apply over the full operating temperature range of C40 c t a 125 c. 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 specified. (note 4) lt1783h symbol parameter conditions min typ max units i s supply current 210 300 m a l 600 m a supply current, shdn v pin5 = 2v, no load (note 10) l 25 m a i shdn shutdown pin current v pin5 = 0.3v, no load (note 10) l 0.5 na v pin5 = 2v, no load (note 10) l 12 m a output leakage current v pin5 = 2v, no load (note 10) l 2.5 m a maximum shutdown pin current v pin5 = 18v, no load (note 10) l 40 m a gbw gain bandwidth product f = 5khz (note 5) 750 1250 khz l 400 khz sr slew rate a v = C1, r l = (note 7) 0.24 0.42 v/ m s l 0.12 v/ m s the l denotes specifications which apply over the full operating temperature range of C40 c t a 125 c. v s = 5v, v cm = 0v, v out = 0v, v shdn = v C , t a = C 40 c to 125 c, for the 6-lead part v pin5 = v C , pulse power tested unless otherwise specified. (note 4) lt1783h symbol parameter conditions min typ max units v os input offset voltage 500 950 m v l 3.1 mv input offset voltage drift (note 9) l 15 m 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 70 160 v/mv l 10 v/mv v o output voltage swing no load l 4.85 v i out = 5ma l 4.20 v i out = 10ma l 3.80 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 230 325 m a l 650 m a supply current, shdn v pin5 = C 3v, v s = 5v, no load (note 10) l 25 m a i shdn shutdown pin current v pin5 = C 4.7v, v s = 5v, no load (note 10) l 0.5 na v pin5 = C 3v, v s = 5v, no load (note 10) l 12 m a maximum shutdown pin current v pin5 = 9v, v s = 9v (note 10) l 45 m a output leakage current v pin5 = C 7v, v s = 9v, no load l 3 m 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 C 2.8 v gbw gain bandwidth product f = 5khz 800 1300 khz l 425 khz sr slew rate a v = C1, r l = , v o = 4v 0.26 0.45 v/ m s measured at v o = 2v l 0.14 v/ m s
7 lt1783 supply current vs supply voltage minimum supply 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 300 280 260 240 220 200 180 160 140 120 t a = 125 c t a = 25 c t a = 55 c total supply voltage (v) 0 1 2 3 4 5 input offset voltage change ( v) 1783 g02 400 300 200 100 0 100 200 300 400 t a = 125 c t a = 55 c t a = 25 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 g03 50000 40000 30000 20000 10000 250 200 150 100 50 0 ?0 t a = 25 c t a = 55 c t a = 125 c sourcing load current (a) 1 0.01 output saturation voltage (v) 0.1 1 100 10 1m 10m 1783 g04 t a = 125 c v s = 2.5v v od = 30mv t a = 55 c t a = 25 c sinking load current (a) 0.01 output saturation voltage (v) 0.1 1 100 1m 10m 1783 g05 0.001 10 1 t a = 55 c t a = 125 c t a = 25 c v s = 2.5v v od = 30mv v in (v) ?0 ? 6 8 10 12 14 16 18 v out (v) 1783 g02a 5 4 3 2 1 0 v s = 5v, 0v ? ? 0 2 ? 4 v in 5v + output voltage vs large input voltage note 1: absolute maximum ratings are those values beyond which the life of a device may be impaired. 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 C 40 c to 85 c. the lt1783h is guaranteed functional over the operating temperature range of C40 c to 125 c. note 4: the lt1783c is guaranteed to meet specified performance from 0 c to 70 c. the lt1783c is designed, characterized and expected to meet specified performance from C 40 c to 85 c but is not tested or qa sampled at these temperatures. the lt1783i is guaranteed to meet specified performance from C 40 c to 85 c. the lt1783h is guaranteed to meet specified performance from C 40 c to 125 c. 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 specification 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: specifications apply to 6-lead sot-23 with shutdown. note 11: full-power bandwidth is calculated from the slew rate. fpbw = sr/2 p v p . electrical characteristics typical perfor a ce characteristics uw
8 lt1783 gain and phase shift vs frequency gain bandwidth product vs temperature slew rate vs temperature frequency (hz) 1k gain (db) 70 60 50 40 30 20 10 0 ?0 ?0 ?0 phase shift (deg) 120 100 80 60 40 20 0 ?0 ?0 ?0 ?0 10k 100k 1m 10m 1783 g10 v s = 2.5v phase gain temperature ( c) 50 25 0 25 50 75 100 125 gain bandwidth (khz) 1783 g11 1400 1350 1300 1250 1200 1150 1100 f = 5khz v s = 2.5v temperature ( c) ?0 ?5 0 25 50 75 100 125 slew rate (v/ s) 1783 g12 0.8 0.7 0.6 0.5 0.4 0.3 0.2 v s = 5v rising falling noise voltage density vs frequency input noise current vs frequency frequency (hz) input noise voltage density (nv/ hz) 70 60 50 40 30 20 10 1 100 1k 10k 1783 g08 10 v s = 2.5v frequency (hz) input noise current density (pa/ hz) 3.0 2.5 2.0 1.5 1.0 0.5 0 1 100 1k 10k 1783 g09 10 v s = 2.5v output saturation voltage vs input overdrive 0.1hz to 10hz noise voltage input overdrive (mv) 0 output saturation voltage (mv) 100 10 1 1783 g06 10 20 30 40 50 60 output high v s = 2.5v no load output low time (sec) noise voltage (400nv/div) 1783 g07 v s = 2.5v 012345678910 temperature ( c) 50 25 0 25 50 75 100 125 output current (ma) 1783 g06a 55 50 45 40 35 30 v s = 5v sinking current sourcing current output short-circuit current vs temperature typical perfor a ce characteristics uw
9 lt1783 psrr vs frequency cmrr vs frequency output impedance vs frequency settling time to 0.1% vs output step capacitive load handling overshoot vs capacitive load frequency (hz) 1k power supply rejection ratio (db) 90 80 70 60 50 40 30 20 10 0 ?0 10k 100k 1m 1783 g15 v s = 2.5v positive supply negative supply frequency (hz) 10k common mode rejection ratio (db) 110 100 90 80 70 60 50 40 30 100k 1m 1783 g16 v s = 2.5v frequency (hz) 100 0.01 output impedance ( ) 100 10k 1k 100k 1m 1783 g17 10 1 0.1 a v = 100 v s = 2.5v a v = 10 a v = 1 settling time ( s) 0 2 4 6 8 10 12 14 16 18 20 output step (v) 1783 g18 4 3 2 1 0 ? ? ? ? a v = 1 v s = 5v a v = 1 a v = 1 a v = 1 capacitive load (pf) 10 overshoot (%) 40 35 30 25 20 15 10 5 0 100 1000 10000 1783 g19 v s = 5v, 0v v cm = 2.5v a v = 1 a v = 5 a v = 10 frequency (hz) 100 100 output impedance ( ) 10k 1m 1k 10k 100k 1m 1783 g17a 1k 100k v s = 2.5v v pin5 (shutdown) = 2.5v disabled output impedance vs frequency (note 8) gain bandwidth product and phase margin vs supply voltage gain bandwidth and phase margin vs load resistance total supply voltage (v) 0 2 4 6 8 10 12 14 16 18 gain baindwidth product (khz) phase margin (deg) 1783 g13 1300 1250 1200 65 60 55 a v = 1 r f = r g = 10k f = 5khz phase margin gain bandwidth product load resistance ( ) 1k 1400 1200 1000 800 65 60 55 10k 100k 1783 g14 v s = 2.5v a v = 1 r f = r g = 10k f = 5khz phase margin gain bandwidth product gain baindwidth product (khz) phase margin (deg) typical perfor a ce characteristics uw
10 lt1783 supply current vs shdn pin voltage large-signal response small-signal response shutdown pin voltage (v) 0 0.5 1 1.5 2 2.5 supply current per amplifier ( a) 1783 g25 275 250 225 200 175 150 125 100 75 50 25 0 t a = 25 c t a = 55 c t a = 125 c v s = 5v, 0v v s = 5v 1783 g26 a v = 1 c l = 15pf v s = 5v 1783 g27 a v = 1 c l = 15pf total harmonic distortion + noise vs output voltage amplitude open-loop gain output voltage (v) 6420246 ? ? ? 1 3 5 input offset voltage change (50 v/div) 1783 g24 r l = 2k v s = 5v r l = 10k r l = 50k output voltage amplitude (v p-p ) 0.1 thd + noise (%) 1 0123 1783 g23 0.01 0.001 10 a v = 1 r f = r g = 100k v s = 1.5v v cm = 0v a v = 1 v s = 1.5v v cm = 0v a v = 1 r f = r g = 100k v s = 3v, 0v v cm = 1.5v a v = 1 v s = 3v, 0v v cm = 1.5v undistorted output swing vs frequency total harmonic distortion + noise vs frequency frequency (hz) 100 1k 10k 100k output swing (v p-p ) 12 10 8 6 4 2 0 1783 g20 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 g21 0.001 0.0001 100 1 a v = 1 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 g22 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 typical perfor a ce characteristics uw
11 lt1783 supply voltage the positive supply pin of the lt1783 should be bypassed with a small capacitor (typically 0.1 m f) within an inch of the pin. when driving heavy loads, an additional 4.7 m f 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 simplified schematic), resulting in three distinct operat- ing 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 tempera- ture 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 transis- tor is fully saturated and the input bias current is typically 30 m a 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 0.22 m f capacitor in series with a 150 w resistor between the output and ground will compensate these amplifiers 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 nonlinear 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, applicatio s i for atio wu uu
12 lt1783 sche atic w w si plified q10 d5 q9 q1 q7 r2 1k r3 1k r4 8k q8 q5 ?n +in q11 q12 d4 q2 d1 q6 q13 q14 r1 6k r5 8k q4 q15 q19 d3 q3 q16 q18 q22 v + q17 q20 q21 out v 1783 ss shdn 10 m a + q23 q24 q25 q26 j1 applicatio s i for atio wu uu typically 100db. when the lt1783 switches between input stages, there is significant 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 character- istics curves, total harmonic distortion + noise vs out- put voltage amplitude. gain the open-loop gain is almost independent of load when the output is sourcing current. this optimizes perfor- mance 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. shutdown the 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 5 m a and the output leakage current is less than 1 m a (v C v out v + ). in normal operation, the shdn pin can be tied to v C or left floating. see the typical performance characteristics curves, supply current vs shutdown voltage.
13 lt1783 typical applicatio u 1783 ta03 18v 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 protected fault conditions
14 lt1783 u package descriptio s5 package 5-lead plastic sot-23 (reference ltc dwg # 05-08-1633) (reference ltc dwg # 05-08-1635) 1.50 ?1.75 (.059 ?.069) (note 3) 2.60 ?3.00 (.102 ?.118) .25 ?.50 (.010 ?.020) (5plcs, note 2) l datum ? .09 ?.20 (.004 ?.008) (note 2) a1 s5 sot-23 0401 pin one 2.80 ?3.10 (.110 ?.118) (note 3) .95 (.037) ref a a2 1.90 (.074) ref .20 (.008) .90 ?1.45 (.035 ?.057) sot-23 (original) .00 ?.15 (.00 ?.006) .90 ?1.30 (.035 ?.051) .35 ?.55 (.014 ?.021) 1.00 max (.039 max) sot-23 (thinsot) a a1 a2 l .01 ?.10 (.0004 ?.004) .80 ?.90 (.031 ?.035) .30 ?.50 ref (.012 ?.019 ref) millimeters (inches) note: 1. controlling dimension: millimeters 2. dimensions are in 3. drawing not to scale 4. dimensions are inclusive of plating 5. dimensions are exclusive of mold flash and metal burr 6. mold flash shall not exceed .254mm 7. package eiaj reference is: sc-74a (eiaj) for original jedel mo-193 for thin
15 lt1783 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 s6 package 6-lead plastic sot-23 (reference ltc dwg # 05-08-1634) (reference ltc dwg # 05-08-1636) 1.50 ?1.75 (.059 ?.069) (note 3) 2.60 ?3.00 (.102 ?.118) .25 ?.50 (.010 ?.020) (6plcs, note 2) l datum ? .09 ?.20 (.004 ?.008) (note 2) a1 s6 sot-23 0401 2.80 ?3.10 (.110 ?.118) (note 3) .95 (.037) ref a a2 1.90 (.074) ref .20 (.008) .90 ?1.45 (.035 ?.057) .00 ?0.15 (.00 ?.006) .90 ?1.30 (.035 ?.051) .35 ?.55 (.014 ?.021) 1.00 max (.039 max) a a1 a2 l .01 ?.10 (.0004 ?.004) .80 ?.90 (.031 ?.035) .30 ?.50 ref (.012 ?.019 ref) pin one id millimeters (inches) note: 1. controlling dimension: millimeters 2. dimensions are in 3. drawing not to scale 4. dimensions are inclusive of plating 5. dimensions are exclusive of mold flash and metal burr 6. mold flash shall not exceed .254mm 7. package eiaj reference is: sc-74a (eiaj) for original jedel mo-193 for thin sot-23 (original) sot-23 (thinsot)
16 lt1783 1783fa lt/tp 0501 2k rev a ? printed in usa ? linear technology corporation 1999 linear technology corporation 1630 mccarthy blvd., milpitas, ca 95035-7417 (408) 432-1900 l fax: (408) 434-0507 l www.linear-tech.com related parts part number description comments lt1782 micropower, over-the-top sot-23 rail-to-rail input sot-23 package, micropower 40 m a per amplifier, rail-to-rail input and output op amp and output , 200khz gbw lt1490/lt1491 dual/quad over-the-top micropower rail-to-rail input single supply input range: C0.4v to 44v, micropower 50 m a per and output op amps amplifier, rail-to-rail input and output , 200khz gbw lt1636 single over-the-top micropower rail-to-rail input 55 m a supply current, v cm extends 44v above v ee , independent of and output op amp v cc , msop package, shutdown function lt1638/lt1639 dual/quad, 1.2mhz, 0.4v/ m s, over-the-top micropower 170 m a supply current, single supply input range: C0.4v to 44v, rail-to-rail input and output op amps rail-to-rail input and output current source + lt1783 r1 lt1634-1.25 1783 ta02 v cc i out = 2n3906 1.25v r1 u typical applicatio

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