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1 LT1637 the lt ? 1637 is a rugged op amp that operates on all single and split supplies with a total voltage of 2.7v to 44v. the LT1637 has a gain-bandwidth product of 1.1mhz while drawing less than 250 m a of quiescent current. the LT1637 can be shut down, making the output high impedance and reducing the quiescent current to only 3 m a. the LT1637 is reverse supply protected: it draws virtually no current for reverse supply up to 25v. the input range of the LT1637 includes both supplies and the output swings to both supplies. unlike most micropower op amps, the LT1637 can drive heavy loads; its rail-to-rail output drives 25ma. the LT1637 is unity-gain stable into all capacitive loads up to 4700pf when optional 0.22 m f and 150 w compensation is used. the LT1637 has a unique input stage that operates and remains high impedance when above the positive supply. the inputs take 44v both differential and common mode, even when operating on a 3v supply. built-in resistors protect the inputs for faults below the negative supply up to 22v. there is no phase reversal of the output for inputs 5v below v ee or 44v above v ee , independent of v cc . the LT1637 op amp is available in the 8-pin msop, pdip and so packages. n battery or solar powered systems: portable instrumentation sensor conditioning n supply current sensing n battery monitoring n mux amplifiers n 4ma to 25ma transmitters , ltc and lt are registered trademarks of linear technology corporation. n operates with inputs above v + n rail-to-rail input and output n micropower: 250 m a supply current max n operating temperature range: C 40 c to 125 c n gain-bandwidth product: 1.1mhz n slew rate: 0.4v/ m s n low input offset voltage: 350 m v max n single supply input range: C 0.4v to 44v n high output current: 25ma min n specified on 3v, 5v and 15v supplies n output shutdown n output drives 4700pf with output compensation n reverse battery protection to 25v n high voltage gain: 800v/mv n high cmrr: 110db over-the-top is a trademark of linear technology corporation. over-the-top tm current source with shutdown shdn i out lt1004-1.2 4.7 f 2k *optional for low output currents, r* = r r 4v to 44v tp0610 1637 ta01 r* + LT1637 i out = e.g., 10ma = 120 w 1.2 r + v shdn 6v 4v 2v 0v 10ma 5ma 0ma i out 100 m s/div switchable precision current source current source timing applicatio s u typical applicatio u 1.1mhz, 0.4v/ m s over-the-top micropower, rail-to-rail input and output op amp features descriptio u 1637 ta01b
2 LT1637 total supply voltage (v + to v C ) .............................. 44v input differential voltage ......................................... 44v input current ...................................................... 25ma shutdown pin voltage above v C ..................................... 32v shutdown pin current ........................................ 10ma output short-circuit duration (note 2) ......... continuous operating temperature range (note 3) LT1637c/LT1637i .............................. C 40 c to 85 c LT1637h .......................................... C 40 c to 125 c consult factory for parts specified with wider operating temperature ranges. (note 1) order part number s8 part marking 1637 1637i 1637h LT1637cn8 LT1637cs8 LT1637in8 LT1637is8 LT1637hs8 1 2 3 4 8 7 6 5 top view null v + out shdn null in + in v s8 package 8-lead plastic so n8 package 8-lead pdip t jmax = 150 c, q ja = 150 c/w (n8) t jmax = 150 c, q ja = 190 c/w (s8) LT1637c/LT1637i symbol parameter conditions min typ max units v os input offset voltage n8, s8 packages 100 350 m v 0 c t a 70 c l 550 m v C40 c t a 85 c l 700 m v ms8 package 100 350 m v 0 c t a 70 c l 750 m v C40 c t a 85 c l 900 m v input offset voltage drift (note 9) n8, s8 packages, C 40 c t a 85 c l 13 m v/ c ms8 package, C 40 c t a 85 c l 26 m v/ c i os input offset current l 0.4 6.0 na v cm = 44v (note 5) l 2.5 m a i b input bias current l 20 50 na v cm = 44v (note 5) l 23 60 m a v s = 0v 0.1 na the l denotes the specifications which apply over the full operating temperature range of C40 c t a 85 c, otherwise specifications are at t a = 25 c. v s = 3v, 0v; v s = 5v, 0v; v shdn = v C ,v cm = v out = half supply unless otherwise specified. (note 4) 3v 5v a u d electrical characteristics package/order i for atio uu w absolute axi u rati gs w ww u specified temperature range (note 4) LT1637c/LT1637i .............................. C 40 c to 85 c LT1637h .......................................... 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 1 2 3 4 null in + in v 8 7 6 5 null v + out shdn top view ms8 package 8-lead plastic msop order part number ms8 part marking ltie LT1637cms8 t jmax = 150 c, q ja = 250 c/w
3 LT1637 input noise voltage 0.1hz to 10hz 0.6 m v p-p e n input noise voltage density f = 1khz 27 nv/ ? hz i n input noise current density f = 1khz 0.08 pa/ ? hz r in input resistance differential 1 2.6 m w common mode, v cm = 0v to 44v 0.7 1.4 m w c in input capacitance 4pf input voltage range l 044v cmrr common mode rejection ratio v cm = 0v to (v cc C 1v) l 88 110 db (note 5) v cm = 0v to 44v (note 8) l 80 98 db a vol large-signal voltage gain v s = 3v, v o = 500mv to 2.5v, r l = 10k 150 400 v/mv v s = 3v, 0 c t a 70 c l 100 v/mv v s = 3v, C 40 c t a 85 c l 75 v/mv v s = 5v, v o = 500mv to 4.5v, r l = 10k 300 800 v/mv v s = 5v, 0 c t a 70 c l 200 v/mv v s = 5v, C 40 c t a 85 c l 150 v/mv v ol output voltage swing low no load l 38 mv i sink = 5ma l 325 700 mv v s = 5v, i sink = 10ma l 580 1300 mv v oh output voltage swing high v s = 3v, no load l 2.94 2.975 v v s = 3v, i source = 5ma l 2.25 2.67 v v s = 5v, no load l 4.94 4.975 v v s = 5v, i source = 10ma l 3.80 4.45 v i sc short-circuit current (note 2) v s = 3v, short output to ground 10 14 ma v s = 3v, short output to v cc 15 45 ma v s = 5v, short output to ground 15 22 ma v s = 5v, short output to v cc 15 60 ma psrr power supply rejection ratio v s = 3v to 12.5v, v cm = v o = 1v l 90 98 db minimum supply voltage l 2.7 v reverse supply voltage i s = C 100 m a l 25 40 v i s supply current 190 250 m a (note 6) l 295 m a supply current, shdn v pin5 = 2v, no load (note 6) l 312 m a i shdn shutdown pin current v pin5 = 0.3v, no load (note 6) l 0.2 15 na v pin5 = 2v, no load (note 5) l 1.0 5 m a v pin5 = 3.3v 2.5 m a v pin5 = 5v 4.3 m a output leakage current, shdn v pin5 = 2v, no load (note 6) l 0.02 1 m a maximum shutdown pin current v pin5 = 32v, no load (note 5) l 20 150 m a t on turn-on time v pin5 = 5v to 0v, r l = 10k 45 m s t off turn-off time v pin5 = 0v to 5v, r l = 10k 3 m s t settling settling time 0.1% a v = 1, d v o = 2v 9 m s LT1637c/LT1637i symbol parameter conditions min typ max units the l denotes the specifications which apply over the full operating temperature range of C40 c t a 85 c, otherwise specifications are at t a = 25 c. v s = 3v, 0v; v s = 5v, 0v; v shdn = v C ,v cm = v out = half supply unless otherwise specified. (note 4) 3v 5v a u d electrical characteristics
4 LT1637 LT1637c/LT1637i symbol parameter conditions min typ max units v os input offset voltage n8, s8 packages 100 450 m v 0 c t a 70 c l 650 m v C40 c t a 85 c l 800 m v ms8 package 100 450 m v 0 c t a 70 c l 800 m v C40 c t a 85 c l 950 m v input offset voltage drift (note 9) n8, s8 packages, C 40 c t a 85 c l 13 m v/ c ms8 package, C 40 c t a 85 c l 26 m v/ c i os input offset current l 16 na i b input bias current l 17 50 na input noise voltage 0.1hz to 10hz 0.6 m v p-p e n input noise voltage density f = 1khz 27 nv/ ? hz i n input noise current density f = 1khz 0.08 pa/ ? hz r in input resistance differential 1 3 m w common mode, v cm = C 15v to 14v 2200 m w c in input capacitance 4pf input voltage range l C15 29 v cmrr common mode rejection ratio v cm = C 15v to 29v l 80 110 db a vol large-signal voltage gain v o = 14v, r l = 10k 100 400 v/mv 0 c t a 70 c l 75 v/mv C40 c t a 85 c l 50 v/mv v ol output voltage swing low no load l C 14.997 C 14.95 v i sink = 5ma l C 14.680 C 14.25 v i sink = 10ma l C 14.420 C 13.65 v the l denotes the specifications which apply over the full operating temperature range of C40 c t a 85 c, otherwise specifications are at t a = 25 c. v s = 15v, v cm = 0v, v out = 0v, v shdn = v C unless otherwise specified. (note 4) 15v electrical characteristics the l denotes the specifications which apply over the full operating temperature range of C40 c t a 85 c, otherwise specifications are at t a = 25 c. v s = 3v, 0v; v s = 5v, 0v; v shdn = v C , v cm = v out = half supply unless otherwise specified. (note 4) 3v 5v a u d electrical characteristics LT1637c/LT1637i symbol parameter conditions min typ max units gbw gain-bandwidth product f = 10khz 650 1000 khz (note 5) 0 c t a 70 c l 550 khz C40 c t a 85 c l 500 khz sr slew rate a v = C 1, r l = 0.210 0.35 v/ m s (note 7) 0 c t a 70 c l 0.185 v/ m s C40 c t a 85 c l 0.170 v/ m s
5 LT1637 v oh output voltage swing high no load l 14.9 14.967 v i source = 5ma l 14.2 14.667 v i source = 10ma l 13.7 14.440 v i sc short-circuit current (note 2) short output to gnd 25 31.7 ma 0 c t a 70 c l 20 ma C40 c t a 85 c l 15 ma psrr power supply rejection ratio v s = 1.5v to 22v l 90 115 db minimum supply voltage l 1.35 v i s supply current 230 300 m a l 370 m a positive supply current, shdn v pin5 = C 20v, v s = 22v, no load l 640 m a i shdn shutdown pin current v pin5 = C 21.7v, v s = 22v, no load l 0.3 15 na v pin5 = C 20v, v s = 22v, no load l 0.9 8 m a maximum shutdown pin current v pin5 = 32v, v s = 22v l 20 150 m a output leakage current, shdn v pin5 = C 20v, v s = 22v, no load l 0.02 2 m a v l shutdown pin input low voltage v s = 22v l C 21.7 C 21.6 v v h shutdown pin input high voltage v s = 22v l C 20.8 C20.0 v t on turn-on time v pin5 = C 10v to C 15v, r l = 10k 35 m s t off turn-off time v pin5 = C 15v to C 10v, r l = 10k 3 m s gbw gain-bandwidth product f = 10khz 750 1100 khz 0 c t a 70 c l 650 khz C40 c t a 85 c l 600 khz sr slew rate a v = C 1, r l = , v o = 10v, measure at v o = 5v 0.225 0.4 v/ m s 0 c t a 70 c l 0.200 v/ m s C40 c t a 85 c l 0.180 v/ m s the l denotes the specifications which apply over the full operating temperature range of C40 c t a 85 c, otherwise specifications are at t a = 25 c. v s = 15v, v cm = 0v, v out = 0v, v shdn = v C unless otherwise specified. (note 4) LT1637c/LT1637i symbol parameter conditions min typ max units 15v electrical characteristics
6 LT1637 LT1637h symbol parameter conditions min typ max units v os input offset voltage 100 450 m v l 3mv input offset voltage drift (note 9) l 310 m v/ c i os input offset current l 15 na v cm = 44v (note 5) l 10 m a i b input bias current l 150 na v cm = 44v (note 5) l 100 m a input voltage range l 0.3 44 v cmrr common mode rejection ratio v cm = 0.3v to (v cc C 1v) l 72 db (note 5) v cm = 0.3v to 44v l 74 db a vol large-signal voltage gain v s = 3v, v o = 500mv to 2.5v, r l = 10k 150 400 v/mv l 20 v/mv v s = 5v, v o = 500mv to 4.5v, r l = 10k 300 800 v/mv l 35 v/mv v ol output voltage swing low no load l 15 mv i sink = 5ma l 900 mv v s = 5v, i sink = 10ma l 1500 mv v oh output voltage swing high v s = 3v, no load l 2.90 v v s = 3v, i source = 5ma l 2.05 v v s = 5v, no load l 4.90 v v s = 5v, i source = 10ma l 3.50 v 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 = C 100 m a l 23 v i s supply current (note 6) 190 250 m a l 400 m a supply current, shdn v pin5 = 2v, no load (note 6) l 15 m a i shdn shutdown pin current v pin5 = 0.3v, no load (note 6) l 200 na v pin5 = 2v, no load (note 5) l 7 m a output leakage current, shdn v pin5 = 2v, no load (note 6) l 5 m a maximum shutdown pin current v pin5 = 32v, no load (note 5) l 200 m a gbw gain-bandwidth product f = 10khz (note 5) 650 1000 khz l 350 khz sr slew rate a v = C 1, r l = (note 7) 0.210 0.35 v/ m s l 0.1 v/ m s the l denotes the 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 unless otherwise specified. (note 4) 3v 5v a u d electrical characteristics
7 LT1637 the l denotes the specifications which apply over the full operating temperature range of C40 c t a 125 c. v s = 15v, v cm = 0v, v out = 0v, v shdn = v C , t a = C40 c to 125 c, unless otherwise specified. (note 4) 15v electrical characteristics LT1637h symbol parameter conditions min typ max units v os input offset voltage 100 550 m v l 3.4 mv input offset voltage drift (note 9) l 311 m v/ c i os input offset current l 25 na i b input bias current l 250 na cmrr common mode rejection ratio v cm = C14.7v to 29v l 72 db a vol large-signal voltage gain v o = 14v, r l = 10k 100 400 v/mv l 4v/mv v o output voltage swing no load l 14.8 v i out = 5ma l 14.0 v i out = 10ma l 13.4 v psrr power supply rejection ratio v s = 1.5v to 22v l 84 db minimum supply voltage l 1.35 v i s supply current 230 300 m a l 500 m a positive supply current, shdn v pin5 = C20v, v s = 22v, no load l 60 m a i shdn shutdown pin current v pin5 = C21.7v, v s = 22v, no load l 200 na v pin5 = C20v, v s = 22v, no load l 10 m a maximum shutdown pin current v pin5 = 32v, v s = 22v l 200 m a output leakage current, shdn v pin5 = C20v, v s = 22v, no load l 100 m a v l shutdown pin input low voltage v s = 22v l C21.7 v v h shutdown pin input high voltage v s = 22v l C20 v gbw gain-bandwidth product f = 10khz 750 1100 khz l 400 khz sr slew rate a v = C 1, r l = , v o = 10v, 0.225 0.4 v/ m s measure at v o = 5v l 0.1 v/ m s 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 LT1637c and LT1637i are guaranteed functional over the operating temperature range of C 40 c to 85 c. the LT1637h is guaranteed functional over the operating temperature range of C40 c to 125 c. note 4: the LT1637c is guaranteed to meet specified performance from 0 c to 70 c. the LT1637c 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 LT1637i is guaranteed to meet specified performance from C 40 c to 85 c. the LT1637h is guaranteed to meet specified performance from C40 c to 125 c. note 5: v s = 5v limits are guaranteed by correlation to v s = 3v and v s = 15v or v s = 22v tests. note 6: v s = 3v limits are guaranteed by correlation to v s = 5v and v s = 15v or v s = 22v tests. note 7: guaranteed by correlation to slew rate at v s = 15v and gbw at v s = 3v and v s = 15v tests. note 8: this specification implies a typical input offset voltage of 650 m v at v cm = 44v and a maximum input offset voltage of 5.4mv at v cm = 44v. note 9: this parameter is not 100% tested.
8 LT1637 input noise current vs frequency 0.1hz to 10hz noise voltage noise voltage density vs frequency output saturation voltage vs load current (output high) output saturation voltage vs input overdrive output saturation voltage vs load current (output low) sourcing load current (ma) 0.0001 0.001 0.01 output saturation voltage (v) 0.1 1 0.01 0.1 1 10 100 1637 g04 v s = 5v, 0v v od = 30mv t a = 25 c t a = 125 c t a = 55 c sinking load current (ma) 0.0001 0.001 0.001 0.01 output saturation voltage (v) 0.1 1 10 0.01 0.1 1 10 100 1637 g05 v s = 5v, 0v v od = 30mv t a = 125 c t a = 55 c t a = 25 c input overdrive (mv) 0 output saturation voltage (mv) 60 80 100 80 1637 g06 40 20 50 70 90 30 10 0 20 40 60 10 90 30 50 70 100 output high output low v s = 5v, 0v no load frequency (hz) 1 input noise current density (pa/ ? hz) 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0 10 100 1000 1637 g09 v s = 15v frequency (hz) 1 20 input noise voltage density (nv/ ? hz) 50 60 70 10 100 1000 1637 g08 40 30 v s = 15v time (s) 0 noise voltage (200nv/div) 8 1637 g07 2 4 6 19 3 5 7 10 v s = 2.5v supply current vs supply voltage input bias current vs common mode voltage minimum supply voltage typical perfor a ce characteristics uw total supply voltage (v) 0 10203040 supply current ( m a) 1637 g01 400 350 300 250 200 150 100 50 0 t a = 125 c t a = 25 c t a = 55 c total supply voltage (v) 0 1 2 3 4 5 change in input offset voltage ( v) 1637 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) 4 4.2 4.4 4.6 4.8 5 10 20 30 40 50 input bias current ( a) 40 30 20 10 0.12 0.08 0.04 0 0.04 0.08 1637 g03 v s = 5v, 0v t a = 125 c t a = 55 c t a = 25 c
9 LT1637 open-loop gain and phase shift vs frequency slew rate vs temperature gain-bandwidth product vs temperature typical perfor a ce characteristics uw frequency (hz) 1k 10 gain (db) phase shift (deg) 20 30 40 50 10k 100k 1m 1637 g10 0 ?0 ?0 ?0 60 70 0 20 40 60 80 100 120 v s = 2.5v phase gain temperature ( c) ?0 gain-bandwidth product (khz) 1300 1200 1100 1000 900 800 700 25 75 1637 g11 ?5 0 50 100 125 v s = 15v v s = 1.5v temperature ( c) ?0 slew rate (v/ m s) 25 1637 g12 25 0 50 75 100 125 0.7 0.6 0.5 0.4 0.3 0.2 0.1 falling, v s = 1.5v falling, v s = 15v rising, v s = 15v rising, v s = 1.5v gain-bandwidth product and phase margin vs load resistance undistorted output swing vs frequency output impedance vs frequency gain-bandwidth product and phase margin vs supply voltage cmrr vs frequency psrr vs frequency total supply voltage (v) 0 gain-bandwidth product (khz) phase margin (deg) 10 20 25 45 1637 g13 515 30 35 40 1300 1250 1200 1150 1100 1050 1000 55 50 45 40 35 30 25 phase margin gain bandwidth frequency (hz) 1k common mode rejection ratio (db) 10k 100k 1m 1637 g14 v s = 1.5v 100 90 80 70 60 50 40 30 20 10 0 v s = 15v frequency (hz) 1k power supply rejection ratio (db) 10k 100k 1m 1637 g15 v s = 2.5v 90 80 70 60 50 40 30 20 10 0 ?0 positive supply negative supply load resistance ( w ) 1k gain-bandwidth product (khz) phase margin (deg) 1400 1300 1200 1100 1000 900 800 700 600 10k 100k 1637 g16 50 45 40 35 30 25 20 15 10 phase margin gain bandwidth v s = 2.5v frequency (hz) 100 0.1 output impedance ( w ) 10 10k 1k 100k 1m 10k 1637 g17 1 100 1k v s = 2.5v a v = 100 a v = 10 a v = 1 frequency (hz) 100 20 output swing (v p-p ) 25 30 35 1k 10k 100k 1637 g18 15 10 5 0 v s = 15v v s = 2.5v distortion 1% a v = 1
10 LT1637 change in input offset voltage (50 m v/div) open-loop gain 0v 10v output voltage (5v/div) c 1637 g24 1637 g25 a: r l = 2k b: r l = 10k c: r l = 50k large-signal response 1637 g26 small-signal response a b C10v total harmonic distortion + noise vs load resistance total harmonic distortion + noise vs output voltage load resistance to ground ( w ) 0.001 thd + noise (%) 0.01 0.1 1 1k 10k 100k 1637 g22 0.0001 100 v s = 3v total a v = 1 v in = 1.8v p-p at 1khz v s = 3v, 0v v in = 0.3v to 2.1v v s = 1.5v v in = 0.9v v s = 3v, 0v v in = 0.6v to 2.4v output voltage (v p-p ) 0.01 thd + noise (%) 1 10 023 1637 g23 0.001 1 0.1 r l = 10k v cm = half supply f = 1khz for a v = ?, r g = 100k a v = ?, v s = 3v, 0v a v = 1 v s = 1.5v a v = 1 v s = 3v, 0v a v = 1 v s = 3v, 0v a v = ? v s = 1.5v v s = 15v v s = 15v a v = C 1 v s = 15v a v = 1 a b c 10v C 10v 50mv C 50mv settling time to 0.1% vs output step total harmonic distortion + noise vs frequency capacitive load handling, overshoot vs capacitive load typical perfor a ce characteristics uw settling time ( m s) 0 ?0 output step (v) ? ? ? 0 10 4 10 20 1637 g19 ? 6 8 2 30 40 a v = 1 a v = 1 a v = 1 v s = 15v a v = 1 capacitive load (pf) 10 40 overshoot (%) 50 60 70 80 100 1000 10000 1637 g20 30 20 10 0 90 100 v s = 2.5v no output compensation a v = 1 a v = 5 a v = 2 a v = 10 frequency (hz) 10 0.0001 thd + noise (%) 0.01 10 100 10k 100k 1k 1637 g21 0.001 0.1 1 v s = 3v, 0v v out = 1.8v p-p v cm = 1.2v r l =10k a v = 1 a v = 1
11 LT1637 supply voltage the positive supply pin of the LT1637 should be bypassed with a small capacitor (about 0.01 m f) within an inch of the pin. when driving heavy loads an additional 4.7 m f electro- lytic capacitor should be used. when using split supplies, the same is true for the negative supply pin. the LT1637 is protected against reverse battery voltages up to 25v. in the event a reverse battery condition occurs, the supply current is typically less than 1na. when operating the LT1637 on total supplies of 30v or more, the supply must not be brought up faster than 1 m s. this is especially true if low esr bypass capacitors are used. a series rlc circuit is formed from the supply lead inductance and the bypass capacitor. 5 w of resistance in the supply or the bypass capacitor will dampen the tuned circuit enough to limit the rise time. inputs the LT1637 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 0.9v or more below v + , the pnp input stage is active and the input bias current is typically C 20na. when the input voltage is about 0.5v or less from v + , the npn input stage is operating and the input bias current is typically 80na. increases in temperature will cause the voltage at which operation switches from the pnp stage to the npn stage to move towards v + . the input offset voltage of the npn stage is untrimmed and is typically 600 m v. a schottky diode in the collector of each npn transistor of the npn input stage allows the LT1637 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 23 m a at room temperature. the input offset voltage is typically 600 m v when operating above v + . the LT1637 will operate with its input 44v above v C regardless of v + . applicatio s i for atio wu u u the inputs are protected against excursions as much as 22v below v C by an internal 1.3k resistor in series with each input and a diode from the input to the negative supply. there is no output phase reversal for inputs up to 5v below v C . there are no clamping diodes between the inputs and the maximum differential input voltage is 44v. output the output voltage swing of the LT1637 is affected by input overdrive as shown in the typical performance curves. when monitoring input voltages within 100mv of v + , gain should be taken to keep the output from clipping. the output of the LT1637 can be pulled up to 25v beyond v + with less than 1na of leakage current, provided that v + is less than 0.5v. the normally reverse biased substrate diode from the output to v C will cause unlimited currents to flow when the output is forced below v C . if the current is transient and limited to 100ma, no damage will occur. the LT1637 is internally compensated to drive at least 200pf 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 4700pf, at all output currents. distortion there are two main contributors of distortion in op amps: output crossover distortion as the output transitions from sourcing to sinking current and distortion caused by nonlinear common mode rejection. of course, if the op amp is operating inverting there is no common mode induced distortion. when the LT1637 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 LT1637 should be operated single supply, with the output always sourcing current and with the input voltage swing between ground and (v + C 0.9v). see the typical performance character- istics curves.
12 LT1637 sche atic w w si plified 7 v + 4 v 6 out 8 1 null null 1637 ss 3 5 +in ?n q25 q24 q26 q18 q17 r6 7k r8 400 w r5 7k r3 1.3k r4 1.3k shdn r7 400 w q16 q15 q10 q11 q9 q8 q14 q2 d5 q13 q1 10 m a q20 q23 d3 q7 d1 d2 d4 q6 q4 q5 2 r2 6k r1 1m q3 q19 q21 q22 q12 applicatio s i for atio wu u u gain the open-loop gain is less sensitive to load resistance when the output is sourcing current. this optimizes per- formance in single supply applications where the load is returned to ground. the typical performance photo of open-loop gain for various loads shows the details. shutdown the LT1637 can be shut down two ways: using the shutdown pin or bringing v + to within 0.5v of v C . when v + is brought to within 0.5v of v C both the supply current and output leakage current drop to less than 10na. when the shutdown pin is brought 1.2v above v C , the supply current drops to about 3 m a and the output leakage current is less than 1 m a, independent of v + . in either case the input bias current is less than 0.1na (even if the inputs are 44v above the negative supply). figure 1. input offset nulling LT1637 10k 1637 f01 v 1 8 the shutdown pin can be taken up to 32v above v C . the shutdown pin can be driven below v C , however the pin current through the substrate diode should be limited with an external resistor to less than 10ma. input offset nulling the input offset voltage can be nulled by placing a 10k potentiometer between pins 1 and 8 with its wiper to v C (see figure 1). the null range will be at least 3mv.
13 LT1637 typical applicatio s u + LT1637 1637 ta03 v in 0.22 m f c l 4700pf 150 w positive supply rail current sense optional output compensation for capacitive loads greater than 200pf + LT1637 in1 (0v to 44v) in2 (0v to 44v) 2n5087 2n5210 1637 ta04 1m v out 1m v cc 100 1m 10k hysteresis = 10k 1m 3v to 44v + LT1637 3v to 44v 3v r1 200 w r s 0.2 w r2 2k v out (0v to 2.7v) q1 2n3904 1637 ta06 load i load v out (r s )(r2/r1) i load = over-the-top comparator with hysteresis lamp outage detector over-the-top current sense + LT1637 5k 1m 5v to 44v 3v 100k 0.5 w lamp on/off out 1637 ta05 out = 0v for good bulb 3v for open bulb + LT1637 5v 200 w 200 w 0.2 w 2k 0v to 4.3v 1637 ta02 v out = (2 w )(i load ) q1 2n3904 load i load
14 LT1637 n8 package 8-lead pdip (narrow 0.300) (ltc dwg # 05-08-1510) ms8 package 8-lead plastic msop (ltc dwg # 05-08-1660) n8 1098 0.100 (2.54) bsc 0.065 (1.651) typ 0.045 ?0.065 (1.143 ?1.651) 0.130 0.005 (3.302 0.127) 0.020 (0.508) min 0.018 0.003 (0.457 0.076) 0.125 (3.175) min 0.009 ?0.015 (0.229 ?0.381) 0.300 ?0.325 (7.620 ?8.255) 0.325 +0.035 0.015 +0.889 0.381 8.255 () 12 3 4 87 6 5 0.255 0.015* (6.477 0.381) 0.400* (10.160) max *these dimensions do not include mold flash or protrusions. mold flash or protrusions shall not exceed 0.010 inch (0.254mm) dimensions in inches (millimeters) unless otherwise noted. package descriptio u msop (ms8) 1100 * dimension does not include mold flash, protrusions or gate burrs. mold flash, protrusions or gate burrs shall not exceed 0.006" (0.152mm) per side ** dimension does not include interlead flash or protrusions. interlead flash or protrusions shall not exceed 0.006" (0.152mm) per side 0.021 0.006 (0.53 0.015) 0 ?6 typ seating plane 0.007 (0.18) 0.043 (1.10) max 0.009 ?0.015 (0.22 ?0.38) 0.005 0.002 (0.13 0.05) 0.034 (0.86) ref 0.0256 (0.65) bsc 12 3 4 0.193 0.006 (4.90 0.15) 8 7 6 5 0.118 0.004* (3.00 0.102) 0.118 0.004** (3.00 0.102)
15 LT1637 dimensions in inches (millimeters) unless otherwise noted. s8 package 8-lead plastic small outline (narrow 0.150) (ltc dwg # 05-08-1610) package descriptio u 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. 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 * **
16 LT1637 linear technology corporation 1630 mccarthy blvd., milpitas, ca 95035-7417 (408) 432-1900 l fax: (408) 434-0507 l www.linear-tech.com ? linear technology corporation 1999 1637f lt/lcg 1200 2k rev a ? printed in usa related parts part number description comments lt1078/lt1079 dual/quad 55 m a max, single supply, precision op amps input/output common mode includes ground, 70 m v v os(max) lt2078/lt2079 and 2.5 m v/ c drift (max), 200khz gbw, 0.07v/ m s slew rate lt1178/lt1179 dual/quad 17 m a max, single supply, precison op amps input/output common mode includes ground, 70 m v v os(max) lt2178/lt2179 and 4 m v/ c drift (max), 85khz gbw, 0.04v/ m s slew rate lt1366/lt1367 dual/quad precision, rail-to-rail input and output op amps 475 m v v os(max) , 500v/mv a vol(min) , 400khz gbw lt1490/lt1491 dual/quad over-the-top micropower, rail-to-rail input and single supply input range: C 0.4v to 44v, micropower 50 m a output op amps per amplifier, rail-to-rail input and output, 200khz gbw lt1636 single over-the-top micropower rail-to-rail input and output 55 m a supply current, v cm extends 44v above v ee , op amp independent of v cc ; msop package, shutdown function lt1638/lt1639 dual/quad 1.2mhz over-the-top micropower, rail-to-rail 0.4v/ m s slew rate, 230 m a supply current per amplifier input and output op amps lt1782 micropower, over-the-top, sot-23, rail-to-rail sot-23, 800 m v v os(max) , i s = 55 m a (max), input and output op amp gain-bandwidth = 200khz, shutdown pin lt1783 1.2mhz, over-the-top, micropower, rail-to-rail sot-23, 800 m v v os(max) , i s = 300 m a (max), input and output op amp gain-bandwidth = 1.2mhz, shutdown pin typical applicatio s u shdn v in v out 3v 150 0.22 f droop (lt1636 buffer): 200mv/s droop into high impedance : less than 0.625mv/s 1637 ta07 + LT1637 3v + lt1636 3v 0v v sample v out 2v/div input select 5v/div 0.2ms/div 1637 ta08 mux amplifier waveforms sample-and-hold shdn v in1 5khz at 4v p-p input select 1khz at 5v p? shdn v in2 10khz at 2v p? v out 5v 74hc04 1637 ta09 + LT1637 5v + LT1637 mux amplifier

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