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1 lt1490/lt1491 dual and quad micropower rail-to-rail input and output op amps n rail-to-rail input and output n single supply input range: C 0.4v to 44v n micropower: 50 m m m m m a/amplifier max n msop package n specified on 3v, 5v and 15v supplies n high output current: 20ma n output drives 10,000pf with output compensation n reverse battery protection to 18v n no supply sequencing problems n high voltage gain: 1500v/mv n high cmrr: 98db n no phase reversal n gain bandwidth product: 200khz the dual lt ? 1490 and quad lt1491 op amps operate on all single and split supplies with a total voltage of 2v to 44v drawing only 40 m a of quiescent current per amplifier. these amplifiers are reverse supply protected; they draw no current for reverse supply up to 18v. the input range of the lt1490/ lt1491 includes both supplies and the output swings to both supplies. unlike most micropower op amps, the lt1490/ lt1491 can drive heavy loads; their rail-to-rail outputs drive 20ma. the lt1490/lt1491 are unity-gain stable and drive all capacitive loads up to 10,000pf when optional 0.22 m f and 150 w compensation is used. the lt1490/lt1491 have a unique input stage that oper- ates 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 resis- tors protect the inputs for faults below the negative supply up to 22v. there is no phase reversal of the output for inputs 22v below v C or 44v above v C , independent of v + . the lt1490 dual op amp is available in the 8-pin msop, so and pdip packages. the quad lt1491 is available in the 14-pin so and pdip packages. for new designs it is recommended that the lt1490a/ lt1491a be used instead of the lt1490/lt1491. see the lt1490a/lt1491a data sheet for details. n battery- or solar-powered systems portable instrumentation sensor conditioning n supply current sensing n battery monitoring n micropower active filters n 4ma to 20ma transmitters + + r a 2k q2 2n3904 s1 s1 = open, gain = 1 s1 = closed, gain = 10 r a = r b v s = 5v, 0v 10k 90.9k v out logic 1490/91 ta01 logic high (5v) = charging logic low (0v) = discharging r g 10k q1 2n3904 r s 0.2 w charger voltage a 1/4 lt1491 b 1/4 lt1491 r a ' 2k r b 2k v batt = 12v i batt + r b ' 2k load + + c 1/4 lt1491 d 1/4 lt1491 v out (r s )(r g /r a )(gain) v out gain i batt = = amps battery monitor features descriptio u applicatio s u typical applicatio u , ltc and lt are registered trademarks of linear technology corporation.
2 lt1490/lt1491 junction temperature ........................................... 150 c specified temperature range (note 3) .. C 40 c to 85 c storage temperature range ................. C 65 c to 150 c lead temperature (soldering, 10 sec).................. 300 c total supply voltage (v + to v C ) .............................. 44v input differential voltage ......................................... 44v input current ...................................................... 25ma output short-circuit duration (note 2) .........continuous operating temperature range ................ C 40 c to 85 c package/order i n for m atio n w u u order part number consult factory for military grade parts. lt1491cn lt1491cs lt1491in lt1491is top view s package 14-lead plastic so n package 14-lead pdip 1 2 3 4 5 6 7 14 13 12 11 10 9 8 a b c out a ?n a +in a v + +in b ?n b out b out d ?n d +in d v +in c ?in c out c d t jmax = 150 c, q ja = 110 c/ w (n) t jmax = 150 c, q ja = 150 c/ w (s) t jmax = 150 c, q ja = 250 c/ w (ms8) t jmax = 150 c, q ja = 130 c/ w (n8) t jmax = 150 c, q ja = 190 c/ w (s8) 1 2 3 4 8 7 6 5 top view ms8 package 8-lead msop n8 package 8-lead pdip s8 package 8-lead plastic so v + out b in b +in b a b out a in a +in a v s8 part marking ms8 part marking order part number ltbb 1490 1490i lt1490cms8 lt1490cn8 lt1490cs8 lt1490in8 lt1490is8 absolute axi u rati gs w ww u (note 1) symbol parameter conditions min typ max units v os input offset voltage lt1490 n package 220 800 m v 0 c t a 70 c l 1000 m v C40 c t a 85 c l 1100 m v lt1490 s package 220 950 m v 0 c t a 70 c l 1200 m v C40 c t a 85 c l 1300 m v lt1491 n package 300 1100 m v 0 c t a 70 c l 1350 m v C40 c t a 85 c l 1450 m v lt1490cms8 package, lt1491 s package 350 1450 m v 0 c t a 70 c l 1650 m v C40 c t a 85 c l 1750 m v v os tc input offset voltage drift 0 c t a 70 c (note 7) l 24 m v/ c C40 c t a 85 c (note 7) l 24 m v/ c i os input offset current l 0.2 0.8 na v cm = 44v (note 4) l 0.8 m a i b input bias current l 48 na v cm = 44v (note 4) l 410 m a v s = 0v 0.1 na input noise voltage 0.1hz to 10hz 1 m v p-p electrical characteristics the l denotes specifications which apply over the full operating temperature range, otherwise specifications are at t a = 25 c. v s = 3v, 0v; v s = 5v, 0v; v cm = v out = half supply, unless otherwise noted. (note 3) (for new designs, use the lt1490a or lt1491a)
3 lt1490/lt1491 symbol parameter conditions min typ max units e n input noise voltage density f = 1khz 50 nv/ ? hz i n input noise current density f = 1khz 0.03 pa/ ? hz r in input resistance differential 6 17 m w common mode, v cm = 0v to 44v 4 11 m w c in input capacitance 4.6 pf input voltage range l 044v cmrr common mode rejection ratio v cm = 0v to v cc C 1v l 84 98 db (note 4) v cm = 0v to 44v l 80 98 db a vol large-signal voltage gain v s = 3v, v o = 500mv to 2.5v, r l = 10k 200 1500 v/mv 0 c t a 70 c l 133 v/mv C40 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 0 c t a 70 c l 250 v/mv C40 c t a 85 c l 200 v/mv v ol output voltage swing low v s = 3v, no load l 22 50 mv v s = 3v, i sink = 5ma l 250 450 mv v s = 5v, no load l 22 50 mv v s = 5v, i sink = 5ma l 250 500 mv v s = 5v, i sink = 10ma 330 500 mv v oh output voltage swing high v s = 3v, no load l 2.95 2.978 v v s = 3v, i source = 5ma l 2.55 2.6 v v s = 5v, no load l 4.95 4.978 v v s = 5v, i source = 10ma l 4.30 4.6 v i sc short-circuit current (note 2) v s = 3v, short to gnd 10 15 ma v s = 3v, short to v cc 10 30 ma v s = 5v, short to gnd 15 25 ma v s = 5v, short to v cc 15 30 ma psrr power supply rejection ratio v s = 2.5v to 12.5v, v cm = v o = 1v l 84 98 db minimum operating supply voltage l 2 2.5 v reverse supply voltage i s = C 100 m a per amplifier l 18 27 v i s supply current per amplifier 40 50 m a (note 5) l 55 m a gbw gain bandwidth product f = 1khz 110 180 khz (note 4) 0 c t a 70 c l 100 khz C40 c t a 85 c l 90 khz sr slew rate a v = C 1, r l = 0.035 0.06 v/ m s (note 6) 0 c t a 70 c l 0.031 v/ m s C40 c t a 85 c l 0.030 v/ m s electrical characteristics the l denotes specifications which apply over the full operating temperature range, otherwise specifications are at t a = 25 c. v s = 3v, 0v; v s = 5v, 0v; v cm = v out = half supply, unless otherwise noted. (note 3)
4 lt1490/lt1491 symbol parameter conditions min typ max units v os input offset voltage lt1490 n, s package 250 1200 m v 0 c t a 70 c l 1400 m v C40 c t a 85 c l 1500 m v lt1491 n package 350 1250 m v 0 c t a 70 c l 1500 m v C40 c t a 85 c l 1600 m v lt1490cms8 package, lt1491 s package 400 1600 m v 0 c t a 70 c l 1850 m v C40 c t a 85 c l 1950 m v v os tc input offset voltage drift 0 c t a 70 c (note 7) l 36 m v/ c C40 c t a 85 c (note 7) l 36 m v/ c i os input offset current l 0.2 0.8 na i b input bias current l 48 na input noise voltage 0.1hz to 10hz 1 m v p-p e n input noise voltage density f = 1khz 50 nv/ ? hz i n input noise current density f = 1khz 0.03 pa/ ? hz r in input resistance differential 6 17 m w common mode, v cm = C 15v to 14v 15000 m w c in input capacitance 4.6 pf input voltage range l C15 29 v cmrr common mode rejection ratio v cm = C 15v to 29v l 80 98 db a vol large-signal voltage gain v o = 14v, r l = 10k 100 250 v/mv 0 c t a 70 c l 75 v/mv C40 c t a 85 c l 50 v/mv v o output voltage swing no load l 14.9 14.978 v i out = 5ma l 14.5 14.750 v i out = 10ma 14.5 14.670 v i sc short-circuit current (note 2) short to gnd 20 25 ma 0 c t a 70 c l 15 ma C40 c t a 85 c l 10 ma psrr power supply rejection ratio v s = 1.25v to 22v l 88 98 db i s supply current per amplifier 50 70 m a l 85 m a gbw gain bandwidth product f = 1khz 125 200 khz 0 c t a 70 c l 110 khz C40 c t a 85 c l 100 khz sr slew rate a v = C 1, r l = , v o = 10v, 0.0375 0.07 v/ m s measure at v o = 5v 0 c t a 70 c l 0.0330 v/ m s C40 c t a 85 c l 0.0300 v/ m s note 1: absolute maximum ratings are those values beyond which the life of the device may be impaired. note 2: a heat sink may be required to keep the junction temperature below absolute maximum. this depends on the power supply voltage and how many amplifiers are shorted. note 3: the lt1490c/lt1491c are guaranteed to meet specified performance from 0 c to 70 c. the lt1490c/lt1491c are designed, characterized and expected to meet specified performance from C 40 c to 85 c but are not tested or qa sampled at these temperatures. the lt1490i/lt1491i are guaranteed to meet specified performance from C40 c to 85 c. note 4: v s = 5v limits are guaranteed by correlation to v s = 3v and v s = 15v tests. note 5: v s = 3v limits are guaranteed by correlation to v s = 5v and v s = 15v tests. note 6: guaranteed by correlation to slew rate at v s = 15v and gbw at v s = 3v and v s = 15v tests. note 7: this parameter is not 100% tested. electrical characteristics the l denotes specifications which apply over the full operating temperature range, otherwise specifications are at t a = 25 c. v s = 15v, v cm = 0v, v out = 0v, unless otherwise noted. (note 3)
5 lt1490/lt1491 total supply voltage (v) 0 0 supply current per amplifier ( m a) 10 30 40 50 70 10 20 25 45 1490/91 g01 20 80 60 515 30 35 40 t a = 125 c t a = 25 c t a = ?5 c supply current vs supply voltage common mode voltage (v) 4.0 input bias current (na) 2000 6000 5.6 1490/91 g03 30 10 4000 20 0 ?0 4.4 4.8 5.2 44 t a = 125 c t a = ?5 c t a = 25 c v s = 5v, 0v total supply voltage (v) 0 change in input offset voltage ( m v) 200 400 4 1490/91 g02 0 200 100 300 100 300 400 1 2 3 5 t a = 25 c t a = 125 c t a = ?5 c minimum supply voltage input bias current vs common mode voltage output saturation voltage vs input overdrive sourcing load current (ma) 0.001 0.01 0.1 1 10 0.01 output saturation voltage (v) 0.1 1 1490/90 g04 v s = 2.5v v od = 30mv t a = 55 c t a = 125 c t a = 25 c output saturation voltage vs load current (output high) output saturation voltage vs load current (output low) sinking load current (ma) 0.001 0.01 0.1 1 10 0.01 output saturation voltage (v) 0.1 1 1490/90 g05 v s = 2.5v v od = 30mv t a = 55 c t a = 125 c t a = 25 c input overdrive (mv) 0 output saturation voltage (mv) 60 80 100 80 1490/91 g06 40 20 50 70 90 30 10 0 20 40 60 10 90 30 50 70 100 v s = 2.5v no load output high output low 0.1hz to 10hz noise voltage frequency (hz) 1 40 input noise voltage density (nv/ hz) 50 60 70 10 100 1k 1490/91 g08 30 80 frequency (hz) 1 input noise current density (pa/ hz) 10 100 1k 1490/91 g09 0.20 0.25 0.30 0.35 0.15 0.10 0.05 0 time (sec) noise voltage (400nv/div) 2468 1490 g07 10 1 03579 v s = 2.5v noise voltage density vs frequency input noise current vs frequency typical perfor a ce characteristics uw
6 lt1490/lt1491 frequency (khz) 1 10 gain (db) phase shift (deg) 20 30 40 50 10 100 1000 1490/91 g10 0 ?0 ?0 ?0 60 70 ?0 0 20 40 60 ?0 ?0 ?0 ?00 80 100 v s = 2.5v phase gain gain and phase shift vs frequency slew rate vs temperature gain bandwidth product vs temperature gain bandwidth product and phase margin vs supply voltage psrr vs frequency gain bandwidth product and phase margin vs load resistance cmrr vs frequency channel separation vs frequency output impedance vs frequency temperature ( c) ?0 slew rate (v/ m s) 0 50 75 1490/91 g12 0.04 0.06 0.10 0.12 0.08 ?5 25 100 125 rising, v s = 15v rising, v s = 1.5v falling, v s = 1.5v falling, v s = 15v total supply voltage (v) 0 150 gain bandwidth product (khz) phase margin (deg) 160 180 190 200 250 220 10 20 25 45 1490/91 g13 170 230 240 210 10 30 60 20 50 40 515 30 35 40 r l = 10k f = 1khz phase margin gain bandwidth frequency (khz) 1 common mode rejection ratio (db) 10 120 100 80 60 40 20 100 1490 g14 v s = 15v v s = 1.5v frequency (khz) 1 ?0 power supply rejection ratio (db) 0 20 40 60 10 100 1490/91 g15 ?0 10 30 50 70 80 v s = 2.5v positive supply negative supply load resistance (k w ) 1 50 gain bandwidth product (khz) phase margin (deg) 100 150 200 250 350 10 100 1490/91 g16 300 20 30 40 50 60 80 70 v s = 2.5v a v = ? r f = r g = 100k f = 1khz phase margin gain bandwidth frequency (khz) 0.1 90 channel separation (db) 100 110 120 130 1 10 100 1490/91 g17 80 70 50 40 60 v s = 15v frequency (khz) 0.1 output impedance ( w ) 100 1k 10k 1 10 100 1490/91 g18 10 1 0.1 v s = 2.5v a v = 100 a v = 10 a v = 1 temperature ( c) ?0 gain bandwidth product (khz) 120 140 160 260 200 0 50 75 1490/91 g11 100 220 240 180 ?5 25 100 125 v s = 15v v s = 3v f = 1khz typical perfor a ce characteristics uw
7 lt1490/lt1491 open-loop gain large-signal response small-signal response output voltage (5v/div) C10v 0v 10v 1490/91 g25 change in input offset voltage (100 m v/div) v s = 15v 1490/91 g26 1490/91 g27 r l = 2k r l = 50k undistorted output swing vs frequency settling time to 0.1% vs output step capacitive load handling, overshoot vs capacitive load total harmonic distortion + noise vs frequency total harmonic distortion + noise vs load resistance frequency (khz) 0.1 20 output swing (v p-p ) 25 30 35 1 10 100 1490/91 g19 15 10 5 0 distortion 1% v s = 15v v s = 2.5v settling time ( m s) 0 ?0 output step (v) ? ? ? 0 10 4 40 80 100 1490/91 f20 ? 6 8 2 20 60 120 140 160 v s = 15v a v = ? a v = ? a v = 1 a v = 1 frequency (khz) 0.01 thd + noise (%) 0.1 1 10 0.01 1 10 1490/91 g22 0.001 0.1 v s = 3v, 0v v out = 2v p-p v cm = 1.2v r l = 50k a v = 1 a v = 1 load resistance to ground (k w ) 0.01 thd + noise (%) 0.1 1 10 0.1 10 100 1490/91 g23 0.001 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 (v p-p ) 0.01 thd + noise (%) 1 10 023 1490/91 g24 0.001 1 0.1 r l = 10k v cm = half supply f = 1khz a v = 1 v s = 3v, 0v a v = ? v s = 3v, 0v a v = ? v s = 1.5v a v = 1 v s = 1.5v total harmonic distortion + noise vs output voltage r l = 10k v s = 15v a v = C1 v s = 15v a v = 1 capacitive load (pf) 20 overshoot (%) 40 60 50 80 100 10 30 70 90 10 100 1000 10000 1490/91 g21 0 v s = 5v, 0v i source = 170 m a a v = 1 a v = 2 a v = 5 a v = 10 typical perfor a ce characteristics uw
8 lt1490/lt1491 supply voltage the positive supply pin of the lt1490/lt1491 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 electrolytic capacitor should be used. when using split supplies, the same is true for the negative supply pin. the lt1490/lt1491 are protected against reverse battery voltages up to 18v. in the event a reverse battery condition occurs, the supply current is less than 1na. the lt1490/lt1491 can be shut down by removing v + . in this condition the input bias current is less than 0.1na, even if the inputs are 44v above the negative supply. when operating the lt1490/lt1491 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 capaci- tors 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 lt1490/lt1491 have two input stages, npn and pnp (see the simplified 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 C 4na. 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 18na. 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 lt1490/lt1491 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 4 m a at room temperature. the input offset voltage is typically 700 m v when operating above v + . the lt1490/lt1491 will operate with its inputs 44v above v C regardless of v + . the inputs are protected against excursions as much as 22v below v C by an internal 1k 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 22v 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 lt1490/lt1491 is af- fected by input overdrive as shown in the typical perfor- mance curves. when monitoring voltages within 100mv of either rail, gain should be taken to keep the output from clipping. the output of the lt1490/lt1491 can be pulled up to 18v 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 lt1490/lt1491 is internally compensated to drive at least 200pf of capacitance under any output loading conditions. 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 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 lt1490 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 lt1490/lt1491 should be operated single supply, with the output always sourc- ing current and with the input voltage swing between ground and (v + C 0.8v). see the typical performance characteristics curves. applicatio s i for atio wu uu
9 lt1490/lt1491 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 photo of open-loop gain for various loads shows the details. + v out 1490/91 ta02 100k 100k c 0.1 m f v out = 5v p-p with 5v supply i s = 200 m a 59k 1/2 lt1490 5v r 50k f = 1 2rc at v s = 5v, r = 50k, c = 1nf output is 5khz slew limited triangle wave + v in 1490/91 ta04 0.22 m f c l 10,000pf 150 w 1/2 lt1490 square wave oscillator optional output compensation for capacitive loads greater than 200pf q10 d5 q9 q1 q7 r2 1k r3 1k r4 40k q8 q5 ?n +in q11 q12 d4 one amplifier d2 q2 d1 q6 q13 q14 r1 30k r5 40k q4 2 m a + q15 q19 d3 q3 q16 q18 q22 v + q17 q20 q21 out v 1490/91 ss applicatio s i for atio wu uu typical applicatio s u si plified sche atic ww
10 lt1490/lt1491 dimensions in inches (millimeters) unless otherwise noted. ms package 8-lead plastic msop (ltc dwg # 05-08-1660) s8 package 8-lead plastic small outline (narrow 0.150) (ltc dwg # 05-08-1610) n8 package 8-lead pdip (narrow 0.300) (ltc dwg # 05-08-1510) msop (ms8) 1098 * 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) 0.040 0.006 (1.02 0.15) 0.012 (0.30) ref 0.006 0.004 (0.15 0.102) 0.034 0.004 (0.86 0.102) 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) n8 1098 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 () 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 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) 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 * ** u package descriptio
11 lt1490/lt1491 dimensions in inches (millimeters) unless otherwise noted. n package 14-lead pdip (narrow 0.300) (ltc dwg # 05-08-1510) s package 14-lead plastic small outline (narrow 0.150) (ltc dwg # 05-08-1610) 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. n14 1098 0.020 (0.508) min 0.125 (3.175) min 0.130 0.005 (3.302 0.127) 0.045 ?0.065 (1.143 ?1.651) 0.065 (1.651) typ 0.018 0.003 (0.457 0.076) 0.100 (2.54) bsc 0.005 (0.125) min 0.255 0.015* (6.477 0.381) 0.770* (19.558) max 3 1 2 4 5 6 7 8 9 10 11 12 13 14 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 () *these dimensions do not include mold flash or protrusions. mold flash or protrusions shall not exceed 0.010 inch (0.254mm) 1 2 3 4 0.150 ?0.157** (3.810 ?3.988) 14 13 0.337 ?0.344* (8.560 ?8.738) 0.228 ?0.244 (5.791 ?6.197) 12 11 10 9 5 6 7 8 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) s14 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 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 * ** u package descriptio
12 lt1490/lt1491 14901fb lt/lcg 0600 2k rev b ? printed in usa ? linear technology corporation 1996 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) and 2.5 m v/ c drift (max), 200khz gbw, 0.07v/ m s slew rate ltc1152 rail-to-rail input, rail-to-rail output, zero-drift amplifier high dc accuracy, 10 m v v os(max) , 100nv/ c, 1mhz gbw, 1v/ m s slew rate, supply current 2.2ma (max), single supply, can be configured for c-load tm operation 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) 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 lt1490a/lt1491a dual/quad micropower rail-to-rail precision op amps 500 m v v os(max) , improved version of the lt1490/lt1491 c-load is a trademark of linear technology corporation. ring-tone generator related parts + + + + 1490/1491 ta03 r6 10k r2 47k r7 16k r8 620k r4 1.6m r1 33k r3 10k r5 100k r10 620k c4 0.068 m f 9 10 6 7 8 1 5 c3 0.047 m f c5 0.01 m f r13 130k r12 10k r15 47k r14 10k r24 420 c7 47 m f load up to ten phones r23 4.7k r26 2k q5 2n3904 q4 2n3906 q2 irf9620 ?80v power amplifier smoothing filter 20hz oscillator cadence oscillator *led of opto1 illuminates when the phone is off the hook see design note dn134 for an explanation of the circuit r18 100 w r17 620 w r16 100k z1 15v 100k r25 4.7k c6 0.033 m f r21 150 w r19 620 w z2 15v r9 300k r11 10k d1 1n4148 c2 0.47 m f c1 1 m f 2 3 1/4 lt1491 1/4 lt1491 12 4 11 13 q1 irf628 q3 2n3904 60v 14 1/4 lt1491 1/4 lt1491 opto1* r20 100k linear technology corporation 1630 mccarthy blvd., milpitas, ca 95035-7417 l (408) 432-1900 fax: (408) 434-0507 l telex: 499-3977 l www.linear-tech.com typical applicatio u

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