View LT1638CDDPBF_6373349.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

lt1638/lt1639 1 16389fg typical application description 1.2mhz, 0.4v/s over-the-top micropower rail-to-rail input and output op amps the lt ? 1638 is a low p wer dual rail-to-rail input and output operational ampli? er available in the standard 8-pin pdip and so packages as well as the 8-lead msop package. the lt1639 is a low power quad rail-to-rail input and output operational ampli? er offered in the standard 14-pin pdip and surface mount packages. for space limited applications the lt1638 is available in a 3mm x 3mm x 0.8mm dual ? ne pitch leadless package (dfn). the lt1638/lt1639 op amps operate on all single and split supplies with a total voltage of 2.5v to 44v drawing only 170a of quiescent current per ampli? er. these ampli- ? ers are reverse battery protected and draw no current for reverse supply up to 18v. the input range of the lt1638/lt1639 includes both sup- plies, and a unique feature of this device is its capability to operate over the top with either or both of its inputs above v + . the inputs handle 44v, both differential and common mode, independent of supply voltage. the input stage incorporates phase reversal protection to prevent false outputs from occurring when the inputs are below the negative supply. protective resistors are included in the input leads so that current does not become excessive when the inputs are forced below the negative supply. the lt1638/lt1639 can drive loads up to 25ma and still maintain rail-to-rail capability. the op amps are unity-gain stable and drive all capacitive loads up to 1000pf when optional output compensation is used. features applications n operates with inputs above v + n rail-to-rail input and output n low power: 230a per ampli? er max n gain bandwidth product: 1.2mhz n slew rate: 0.4v/s n high output current: 25ma min n speci? ed on 3v, 5v and 15v supplies n reverse battery protection to 18v n no supply sequencing problems n high voltage gain: 1500v/mv n single supply input range: C0.4v to 44v n high cmrr: 98db n no phase reversal n available in 14-lead so, 8-lead msop and dfn packages 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 v cc v cc v1 v2 v0 C + a 1/2 lt1638 C + b 1/2 lt1638 v cc 1m 1m 1m 10k 10k v cc = 5v, v cm = 0v to 44v, t pd = 27s 1638/39 ta01 1m over-the-top ? comparator with 100mv hysteresis centered at 0mv output voltage vs input voltage 5v 0v 1638/39 ta02 20mv/div l , lt, ltc, ltm, over-the-top, linear technology and the linear logo are registered trademarks of linear technology corporation. all other trademarks are the property of their respective owners.
lt1638/lt1639 2 16389fg absolute maximum ratings speci? ed temperature range (note 4) lt1638c/lt1639c ................................C 40c to 85c lt1638i/lt1639i ..................................C 40c to 85c lt1638h/lt1639h .............................C 40c to 125c junction temperature .......................................... 150c dd package ...................................................... 125c storage temperature range ...................C 65c to 150c dd package .......................................C 65c to 125c lead temperature (soldering, 10 sec) .................. 300c 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 (note 3) lt1638c/lt1639c ................................C 40c to 85c lt1638i/lt1639i ..................................C 40c to 85c lt1638h/lt1639h .............................C 40c to 125c (note 1) 1 2 3 4 out a Cin a +in a v C 8 7 6 5 v+ out b Cin b +in b top view ms8 package 8-lead plastic msop a b t jmax = 150c, ja = 273c/w 1 2 3 4 8 7 6 5 top view n8 package 8-lead pdip s8 package 8-lead plastic so v + out b Cin b +in b a b out a Cin a +in a v C t jmax = 150c, ja = 150c/w (n8) t jmax = 150c, ja = 190c/w (s8) top view dd package 8-lead (3mm s 3mm) plastic dfn 5 6 7 8 4 3 2 1 out a Cin a +in a v C v + out b Cin b +in b a b t jmax = 125c, ja = 43c/w underside metal internally connected to v C 1 2 3 4 5 6 7 14 13 12 11 10 9 8 top view n package 14-lead pdip s package 14-lead plastic so out d Cin d +in d v C +in c Cin c out c a d b c out a Cin a +in a v + +in b Cin b out b t jmax = 150c, ja = 130c/w (n) t jmax = 150c, ja = 160c/w (s) pin configuration
lt1638/lt1639 3 16389fg order information lead free finish tape and reel part marking* package description specified temperature range lt1638cms8#pbf lt1638cms8#trpbf ltcy 8-lead plastic msop C40c to 85c lt1638ims8#pbf lt1638ims8#trpbf ltcy 8-lead plastic msop C40c to 85c lt1638cdd#pbf lt1638cdd#trpbf laal 8-lead (3mm 3mm) plastic dfn C40c to 85c lt1638idd#pbf lt1638idd#trpbf laal 8-lead (3mm 3mm) plastic dfn C40c to 85c lt1638cn8#pbf lt1638cn8#trpbf lt1638cn8 8-lead pdip C40c to 85c lt1638in8#pbf lt1638in8#trpbf lt1638in8 8-lead pdip C40c to 85c lt1638cs8#pbf lt1638cs8#trpbf 1638 8-lead plastic so C40c to 85c lt1638is8#pbf lt1638is8#trpbf 1638i 8-lead plastic so C40c to 85c lt1638hs8#pbf lt1638hs8#trpbf 1638h 8-lead plastic so C40c to 125c lt1639cn#pbf lt1639cn#trpbf lt1639cn 14-lead pdip C40c to 85c lt1639in#pbf lt1639in#trpbf lt1639in 14-lead pdip C40c to 85c lt1639cs#pbf lt1639cs#trpbf lt1639cs 14-lead plastic so C40c to 85c lt1639is#pbf lt1639is#trpbf lt1639is 14-lead plastic so C40c to 85c lt1639hs#pbf lt1639hs#trpbf lt1639hs 14-lead plastic so C40c to 125c consult ltc marketing for parts speci? ed with wider operating temperature ranges. *the temperature grade is identi? ed by a label on the shipping container. consult ltc marketing for information on non-standard 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/
lt1638/lt1639 4 16389fg electrical characteristics lt1638c/lt1639c, lt1638i/lt1639i symbol parameter conditions min typ max units v os input offset voltage lt1638 n, s packages 0c t a 70c C 40c t a 85c l l 200 600 850 950 v v v lt1639 n, s packages 0c t a 70c C 40c t a 85c l l 300 700 950 1050 v v v lt1638 ms8 package 0c t a 70c C 40c t a 85c l l 350 900 1150 1450 v v v lt1638 dd package 0c t a 70c C 40c t a 85c l l 400 1100 1350 1450 v v v input offset voltage drift (note 9) lt1638/lt1639 n, s packages lt1638ms8, lt1638dd l l 2 2.5 6 7 v/c v/c i os input offset current v cm = 44v (note 5) l l 16 2.5 na a i b input bias current v cm = 44v (note 5) v s = 0v l l 20 8 0.1 50 30 na a na 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 0.3 pa/ hz r in input resistance differential common mode, v cm = 0v to 44v 1 1.4 2.5 5.5 m m c in input capacitance 5pf input voltage range l 04 4v cmrr common mode rejection ratio v cm = 0v to v cc C 1v v cm = 0v to 44v (note 8) l l 88 80 98 88 db db a vol large-signal voltage gain v s = 3v, v o = 500mv to 2.5v, r l = 10k 0c t a 70c C 40c t a 85c l l 200 133 100 1500 v/mv v/mv v/mv v s = 5v, v o = 500mv to 4.5v, r l = 10k 0c t a 70c C 40c t a 85c l l 400 250 200 1500 v/mv v/mv v/mv v ol output voltage swing low v s = 3v, no load v s = 3v, i sink = 5ma l l 3 250 8 450 mv mv v s = 5v, no load v s = 5v, i sink = 10ma l l 3 500 8 700 mv mv v oh output voltage swing high v s = 3v, no load v s = 3v, i source = 5ma l l 2.94 2.25 2.98 2.40 v v v s = 5v, no load v s = 5v, i source = 10ma l l 4.94 3.8 4.98 4.0 v v i sc short-circuit current (note 2) v s = 3v, short to gnd v s = 3v, short to v cc 10 15 15 25 ma ma v s = 5v, short to gnd v s = 5v, short to v cc 15 15 20 25 ma ma 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, unless otherwise noted. (note 4)
lt1638/lt1639 5 16389fg lt1638c/lt1639c, lt1638i/lt1639i symbol parameter conditions min typ max units psrr power supply rejection ratio v s = 3v to 12.5v, v cm = v o = 1v l 90 100 db reverse supply voltage i s = C 100a per ampli? er l 18 27 v minimum operating supply voltage l 2.4 2.7 v i s supply current per ampli? er (note 6) l 170 230 275 a a gbw gain bandwidth product (note 5) f = 5khz 0c t a 70c C 40c t a 85c l l 650 550 500 1075 khz khz khz sr slew rate (note 7) a v = C 1, r l = 0c t a 70c C 40c t a 85c l l 0.210 0.185 0.170 0.38 v/s v/s v/s 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, unless otherwise noted. (note 4) the l denotes the speci? cations which apply over the speci? ed temperature range, otherwise speci? cations are at t a = 25c. v s = 15v, v cm = 0v, v out = 0v, unless otherwise noted. (note 4) lt1638c/lt1639c, lt1638i/lt1639i symbol parameter conditions min typ max units v os input offset voltage lt1638 n, s packages 0c t a 70c C 40c t a 85c l l 250 800 1000 1100 v v v lt1639 n, s packages 0c t a 70c C 40c t a 85c l l 350 900 1100 1200 v v v lt1638 ms8 package 0c t a 70c C 40c t a 85c l l 400 1050 1250 1550 v v v lt1638 ddpackage 0c t a 70c C 40c t a 85c l l 450 1250 1450 1550 v v v input offset voltage drift (note 9) lt1638/lt1639 n, s packages lt1638ms8, lt1638dd l l 2 2.5 6 7 v/c v/c i os input offset current l 16 na i b input bias current l 20 50 na 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 0.3 pa/ hz r in input resistance differential common mode, v cm = C 15v to 14v 1 2.5 500 m m c in input capacitance 4.5 pf input voltage range l C15 29 v cmrr common mode rejection ratio v cm = C15v to 29v l 80 88 db a vol large-signal voltage gain v o = 14v, r l = 10k 0c t a 70c C 40c t a 85c l l 200 125 100 500 v/mv v/mv v/mv v o output voltage swing no load i out = 10ma l l 14.9 13.7 14.95 14.0 v v
lt1638/lt1639 6 16389fg lt1638c/lt1639c, lt1638i/lt1639i symbol parameter conditions min typ max units i sc short-circuit current (note 2) short to gnd 0c t a 70c C 40c t a 85c l l 25 20 15 40 ma ma ma psrr power supply rejection ratio v s = 1.5v to 22v l 90 100 db i s supply current per ampli? er l 205 280 350 a a gbw gain bandwidth product f = 5khz 0c t a 70c C 40c t a 85c l l 750 650 600 1200 khz khz khz sr slew rate a v = C 1, r l = , v o = 10v 0c t a 70c C 40c t a 85c l l 0.225 0.2 0.18 0.4 v/s v/s v/s 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 = 15v, v cm = ov, v out = ov, unless otherwise noted. (note 4) 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 unless otherwise speci? ed. (note 4) lt1638h/lt1639h symbol parameter conditions min typ max units v os input offset voltage lt1638s8 l 200 650 3 v mv lt1639s l 300 750 3.2 v mv input offset voltage drift (note 9) l 15 v/c i os input offset current v cm = 44v (note 5) l l 15 10 na a i b input bias current v cm = 44v (note 5) l l 150 100 na a input voltage range l 0.3 44 v cmrr common mode rejection ratio v cm = 0.3v to v cc C 1v v cm = 0.3v to 44v l l 76 72 db db a vol large-signal voltage gain v s = 3v, v o = 500mv to 2.5v, r l = 10k l 200 20 1500 v/mv v/mv v s = 5v, v o = 500mv to 4.5v, r l = 10k l 400 35 1500 v/mv v/mv v ol output voltage swing low no load i sink = 5ma v s = 5v, i sink = 10ma l l l 15 900 1500 mv mv m v v oh output voltage swing high v s = 3v, no load v s = 3v, i source = 5ma l l 2.9 2 v v v s = 5v, no load v s = 5v, i source = 10ma l l 4.9 3.5 v 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 100a l 18 v i s supply current (note 6) l 170 230 450 a a gbw gain bandwidth product (note 5) f = 5khz l 650 350 1075 khz khz sr slew rate (note 7) a v = C 1, r l = l 0.21 0.1 0.38 v/s v/s
lt1638/lt1639 7 16389fg electrical characteristics lt1638h/lt1639h symbol parameter conditions min typ max units v os input offset voltage lt1638s8 l 250 850 3.4 v mv lt1639s l 350 950 3.6 v mv input offset voltage drift (note 9) l 15 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 = C 14.7v to 29v l 72 db a vol large-signal voltage gain v o = 14v, r l = 10k l 200 15 500 v/mv v/mv v o output voltage swing no load i out = 5ma i out = 10ma l l l 14.8 14 13.4 v v 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 l 205 280 550 a a gbw gain bandwidth product f = 5khz l 750 400 1200 khz khz sr slew rate a v = C1, r l = , v o = 10v, measured at v o = 5v l 0.225 0.1 0.4 v/s v/s tested or qa sampled at these temperatures. the lt1638i/lt1639i are guaranteed to meet speci? ed performance from C40c to 85c. the lt1638h/lt1639h are 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 = 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 speci? cation implies a typical input offset voltage of 2mv at v cm = 44v and a maximum input offset voltage of 5mv at v cm = 44v. note 9: this parameter is not 100% tested. 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. this depends on the power supply voltage and how many ampli? ers are shorted. note 3: the lt1638c/lt1639c and lt1638i/lt1639i are guaranteed functional over the operating temperature range of C40c to 85c the lt1638h/lt1639h are guaranteed functional over the operating temperature range of C40c to 125c. note 4: the lt1638c/lt1639c are guaranteed to meet speci? ed performance from 0c to 70c and are designed, characterized and expected to meet speci? ed performance from C40c to 85c but not the l denotes the speci? cations which apply over the full operating temperature range of C 40c ta 125c, otherwise speci? cations are at t a = 25c. v s = 15v, v cm = 0v, v out = 0v, v shdn = v C unless otherwise speci? ed. (note 4)
lt1638/lt1639 8 16389fg typical performance characteristics minimum supply voltage input bias current vs common mode voltage output saturation voltage vs load current (output high) 0.1hz to 10hz noise voltage noise voltage density vs frequency supply voltage (v) 0 supply current per amplifier (a) 10 20 25 45 1638/39 g01 300 280 260 240 220 200 180 160 140 120 100 515 30 35 40 t a = 125c t a = 25c t a = C55c supply current vs supply voltage total supply voltage (v) 0 change in input offset voltage (v) 200 400 4 1638/39 g02 0 C200 100 300 C100 C300 C400 1 2 3 5 t a = 125c t a = C55c t a = 25c common mode voltage (v) 4.0 input bias current (na) 10000 8000 6000 60 40 20 0 C20 C40 5.6 1638/39 g03 4.4 4.8 5.2 44 t a = 125c t a = C55c t a = 25c v s = 5v, 0v frequency (hz) 1 4.5 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0 10 100 1k 1638/39 g08 input noise current density (pa/ hz) time (sec) 013579 noise voltage (400nv/div) 2468 1638/39 g07 10 v s = p2.5 frequency (hz) 1 input noise voltage density (nv/hz) 10 100 1k 1638/39 g09 70 60 50 40 30 20 10 0 sourcing load current (ma) 0.001 0.01 output saturation voltage (v) 0.1 1 0.01 0.1 1 10 1638/39 g04 v s = 2.5v v od = 30mv t a = 125c t a = C55c t a = 25c sinking load current (ma) 0.001 0.001 output saturation voltage (v) 0.1 0.01 1 0.01 0.1 1 10 1638/39 g05 v s = 2.5v v od = 30mv t a = 125c t a = C55c t a = 25c input overdrive (mv) 10 output saturation voltage (mv) 30 100 1638/39 g06 1 10 20 100 90 807060 50 40 0 v s = 2.5v no load output high output low output saturation voltage vs input overdrive output saturation voltage vs load current (output low) input noise current density vs frequency
lt1638/lt1639 9 16389fg frequency (khz) output impedance () 10k 1k 100 10 1 0.1 0.1 10 100 1000 1638/39 g20 1 a v = 1 a v = 100 a v = 10 v s = 2.5v typical performance characteristics psrr vs frequency output impedance vs frequency load resistance (k) 1 gain bandwidth product (khz) phase margin (deg) 1500 1400 1300 1200 1100 1000 900 800 10 100 1638/39 g17 60 50 40 30 20 10 0 C10 v s = 2.5v a v = C1 r f = r g = 100k f = 1khz phase margin gain bandwidth product gain and phase shift vs frequency frequency (khz) 1 10 gain (db) phase shift (deg) 20 30 40 50 10 100 1000 1638/39 g12 0 C10 C20 80 60 70 40 50 60 70 80 30 20 10 0 90 100 v s = 2.5v phase gain frequency (khz) power supply rejection ratio (db) 90 80 70 60 50 40 30 20 10 0 C10 1 10 100 1000 1638/39 g16 v s = 2.5v positive supply negative supply temperature (c) C50 slew rate (v/s) 0 50 75 1638/39 g14 C25 25 100 125 rising, v s = 15v rising, v s = 2.5v falling, v s = 2.5v 0.60 0.55 0.50 0.45 0.40 0.35 0.30 0.25 falling, v s = 15v slew rate vs temperature gain bandwidth product and phase margin vs supply voltage total supply voltage (v) 0 1000 gain bandwidth product (khz) 1200 1500 10 20 25 45 1638/39 g15 1100 1400 1300 phase margin (deg) 10 30 60 20 50 40 515 30 35 40 phase margin gain bandwidth gain bandwidth product and phase margin vs load resistance frequency (khz) common mode rejection ratio (db) 120 110 100 90 80 70 60 50 40 30 20 1 10 100 1000 1638/39 g18 v s = 15v cmrr vs frequency frequency (khz) 0.1 channel separation (db) 130 120 110 100 90 80 70 60 1 10 100 1638/39 g19 v s = 15v channel separation vs frequency temperature (c) C50 gain bandwidth product (khz) 1500 1400 1300 1200 1100 1000 900 800 0 50 75 1638/39 g13 C25 25 100 125 v s = 15v v s = 2.5v f = 1khz gain bandwidth product vs temperature
lt1638/lt1639 10 16389fg output voltage (5v/div) change in input offset voltage (50v/div) 1638/39 g27 C10v C20v 0v 10v 20v r l = 2k v s = 15v r l = 10k r l = 50k settling time to 0.1% vs output step capacitive load handling, overshoot vs capacitive load settling time (s) 0 C10 output step (v) C8 C4 C2 0 10 4 10 20 25 1638/39 g21 C6 6 8 2 515 30 35 a v = C1 a v = C1 a v = 1 a v = 1 v s = 15v undistorted output swing vs frequency total harmonic distortion + noise vs frequency total harmonic distortion + noise vs load resistance total harmonic distortion + noise vs output voltage open-loop gain large-signal response small-signal response 1638/39 g28 1638/39 g29 v s = 15v a v = 1 v s = 15v a v = 1 c l = 15pf capacitive load (pf) overshoot (%) 100 90 80 70 60 50 40 30 20 10 0 10 100 1000 10000 1638/39 g22 a v = 1 a v = 5 a v = 10 v s = 5v, 0v v cm = 2.5v i source = 150a frequency (khz) 0.1 output swing (v p-p ) 1 10 100 1638/39 g23 35 30 25 20 15 10 5 0 distortion 1% r l = 20k v s = 2.5v v s = 15v frequency (khz) thd + noise (%) 0.01 1 10 100 1638/39 g24 0.1 10 1 0.1 0.01 0.001 v s = 3v, 0v v out = 2v p-p v cm = 1.2v r l = 20k a v = C1 a v = 1 load resistance to ground (k) 0.01 thd + noise (%) 0.1 1 10 0.1 10 100 1638/39 g25 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 ) thd + noise (%) 10 1 0.1 0.01 0.001 023 1638/39 g26 1 r l = 10k, f = 1khz v cm = half supply a v = C1, v s = 1.5v a v = C1, v s = 3v, 0v a v = 1, v s = 1.5v a v = 1, v s = 3v, 0v typical performance characteristics
lt1638/lt1639 11 16389fg applications information supply voltage the positive supply pin of the lt1638/lt1639 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 lt1638/lt1639 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 lt1638/lt1639 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 lt1638/lt1639 on total supplies of 10v or more, the supply must not be brought up faster than 1v/s. increasing the bypass capacitor and/or add- ing a small resistor in series with the supply will limit the rise time. inputs the lt1638/lt1639 have 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 C20na. 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 40na. 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 600v. a schottky diode in the collector of each npn transistor allow the lt1638/lt1639 to operate over the top, 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 8a at room temperature. the input offset voltage is typically 2mv when operating above v + . the lt1638/lt1639 will operate with its inputs 44v above v C regardless of v + . the inputs are protected against excursions of 2v below v C by an internal 1k resistor in series with each input and a diode from the input to the negative supply. if the inputs can go more than 2v below v C , an additional external resistor is required. a 10k resistor will protect the input against excursions as much as 10v below v C . the input stage of the lt1638/lt1639 incorporates phase reversal protection to prevent the output from phase reversing for inputs below v C . there are no clamping diodes between the inputs and the maximum differential input voltage is 44v. output the output of the lt1638/lt1639 can swing within 20mv of the positive rail with no load, and within 3mv of the negative rail with no load. when monitoring voltages within 20mv of the positive rail or within 3mv of the negative rail, gain should be taken to keep the output from clipping. the lt1638/lt1639 are capable of sinking and sourcing over 40ma on 15v supplies; sourcing current capability is reduced to 20ma at 5v total supplies as noted in the electrical characteristics. the lt1638/lt1639 are internally compensated to drive at least 200pf of capacitance under any output loading conditions. 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 1000pf, at all output currents. optional output compensation for capacitive loads greater than 200pf C + lt1638 v in 1000pf 0.22f 150 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
lt1638/lt1639 12 16389fg applications information 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, typically 98db. when the lt1638 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 lt1638/lt1639 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. 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. typical applications with 1.2mhz bandwidth, over-the-top capability, reverse- battery protection and rail-to-rail input and output features, the lt1638/lt1639 are ideal candidates for general purpose applications. the lowpass slope limiting ? lter in figure 1 limits the maximum dv/dt (not frequency) that it passes. when the input signal differs from the output by one forward diode drop, d1 or d2 will turn on. with a diode on, the voltage across r2 will be constant and a ? xed current, v diode /r2, will ? ow through capacitor c1, charging it linearly instead of exponentially. the maximum slope that the circuit will pass is equal to v diode divided by (r2)(c1). no matter how fast the input changes the output will never change any faster than the dv/dt set by the diodes and (r2)(c). figure 1. lowpass slope limiting filter C + 1/2 lt1638 c1 v out 1638/39 f01 r2 d2 d1 r1 v in for r1 = 10k, r2 = 100k, c1 = 1000pf v out(max) = d dt v d (r2)(c1) v out(max) = 0.006v/s d dt a modi? cation of this application is shown in figure 2 using references instead of diodes to set the maximum slope. by using references, the slope is independent of temperature. a scope photo shows a 1v p-p , 2khz input signal with a 2v pulse added to the sine wave; the circuit passes the 2khz signal but limits the slope of the pulse. v out v in response of slope limiting filter figure 2. lowpass slope limiting filter with 0 tc 1638/39 ta02 C + C + 1/4 lt1639 C + 1/4 lt1639 1/4 lt1639 d1 d2 v cc c1 v out v ee v in r5 100k r6 100k 1638/39 f02 lt1634-1.2v r3 100k r4 100k r2 r1 1k d3 d4 lt1634-1.2v for r2 = 50k, c1 = 500pf, maximum slope = 0.048v/s v out = d dt 1.2v (r2)(c1) d1 to d4 = in4148
lt1638/lt1639 13 16389fg simplified schematic typical applications C + 1/2 lt1638 5v v + 200 200 0.2 2k 0v to 4.3v 1638/39 f03 v out = (2)(i load ) q1 2n3904 load i load figure 4. current source figure 3. positive supply rail current sense C + 1/2 lt1638 r1 1.2v r1 i out = lt1634-1.2 i out 1638/39 f04 v cc v cc the application in figure 3 utilizes the over-the-top capabilities of the lt1638. the 0.2 resistor senses the load current while the op amp and npn transistor form a closed loop making the collector current of q1 propor tional to the load current. as a convenient monitor, the 2k load resistor converts the current into a voltage. the positive supply rail, v + , is not limited to the 5v supply of the op amp and could be as high as 44v. the figure 4 application uses the lt1638 in conjunction with the lt1634 micropower shunt reference. the supply current of the op amp also biases the reference. the drop across resistor r1 is ? xed at 1.2v generating an output current equal to 1.2v/r1. q10 d5 q9 q1 q7 r2 1k r3 1k r4 8k q8 q5 Cin +in q11 q12 d4 one amplifier d2 q2 d1 q6 q13 q14 r1 6k r5 8k q4 10a + q15 q19 d3 q3 q16 q18 q22 v + q17 q20 q21 out v C 1638/39 ss
lt1638/lt1639 14 16389fg please refer to http://www.linear.com/designtools/packaging/ for the most recent package drawings. package description dd package 8-lead plastic dfn (3mm 3mm) (reference ltc dwg # 05-08-1698 rev c) 3.00 p0.10 (4 sides) note: 1. drawing to be made a jedec package outline m0-229 variation of (weed-1) 2. drawing not to scale 3. all dimensions are in millimeters 4. dimensions of exposed pad on bottom of package do not include mold flash. mold flash, if present, shall not exceed 0.15mm on any side 5. exposed pad shall be solder plated 6. shaded area is only a reference for pin 1 location on top and bottom of package 0.40 p 0.10 bottom viewexposed pad 1.65 p 0.10 (2 sides) 0.75 p0.05 r = 0.125 typ 2.38 p0.10 1 4 8 5 pin 1 top mark (note 6) 0.200 ref 0.00 C 0.05 (dd8) dfn 0509 rev c 0.25 p 0.05 2.38 p0.05 recommended solder pad pitch and dimensions apply solder mask to areas that are not soldered 1.65 p0.05 (2 sides) 2.10 p0.05 0.50 bsc 0.70 p0.05 3.5 p0.05 package outline 0.25 p 0.05 0.50 bsc ms8 package 8-lead plastic msop (reference ltc dwg # 05-08-1660 rev f) msop (ms8) 0307 rev f 0.53 p 0.152 (.021 p .006) seating plane note: 1. dimensions in millimeter/(inch) 2. drawing not to scale 3. dimension does not include mold flash, protrusions or gate burrs. mold flash, protrusions or gate burrs shall not exceed 0.152mm (.006") per side 4. dimension does not include interlead flash or protrusions. interlead flash or protrusions shall not exceed 0.152mm (.006") per side 5. lead coplanarity (bottom of leads after forming) shall be 0.102mm (.004") max 0.18 (.007) 0.254 (.010) 1.10 (.043) max 0.22 C 0.38 (.009 C .015) typ 0.1016 p 0.0508 (.004 p .002) 0.86 (.034) ref 0.65 (.0256) bsc 0o C 6o typ detail a detail a gauge plane 12 3 4 4.90 p 0.152 (.193 p .006) 8 7 6 5 3.00 p 0.102 (.118 p .004) (note 3) 3.00 p 0.102 (.118 p .004) (note 4) 0.52 (.0205) ref 5.23 (.206) min 3.20 C 3.45 (.126 C .136) 0.889 p 0.127 (.035 p .005) recommended solder pad layout 0.42 p 0.038 (.0165 p .0015) typ 0.65 (.0256) bsc
lt1638/lt1639 15 16389fg please refer to http://www.linear.com/designtools/packaging/ for the most recent package drawings. package description s8 package 8-lead plastic small outline (narrow .150 inch) (reference ltc dwg # 05-08-1610) n8 package 8-lead pdip (narrow .300 inch) (reference ltc dwg # 05-08-1510) n8 1002 .065 (1.651) typ .045 C .065 (1.143 C 1.651) .130 .005 (3.302 0.127) .020 (0.508) min .018 .003 (0.457 0.076) .120 (3.048) min 12 3 4 87 6 5 .255 .015* (6.477 0.381) .400* (10.160) max .008 C .015 (0.203 C 0.381) .300 C .325 (7.620 C 8.255) .325 +.035 C.015 +0.889 C0.381 8.255 () note: 1. dimensions are inches millimeters *these dimensions do not include mold flash or protrusions. mold flash or protrusions shall not exceed .010 inch (0.254mm) .100 (2.54) bsc .016 C .050 (0.406 C 1.270) .010 C .020 (0.254 C 0.508) s 45 o 0 o C 8 o typ .008 C .010 (0.203 C 0.254) so8 0303 .053 C .069 (1.346 C 1.752) .014 C .019 (0.355 C 0.483) typ .004 C .010 (0.101 C 0.254) .050 (1.270) bsc 1 2 3 4 .150 C .157 (3.810 C 3.988) note 3 8 7 6 5 .189 C .197 (4.801 C 5.004) note 3 .228 C .244 (5.791 C 6.197) .245 min .160 p.005 recommended solder pad layout .045 p.005 .050 bsc .030 p.005 typ inches (millimeters) note: 1. dimensions in 2. drawing not to scale 3. these dimensions do not include mold flash or protrusions. mold flash or protrusions shall not exceed .006" (0.15mm)
lt1638/lt1639 16 16389fg please refer to http://www.linear.com/designtools/packaging/ for the most recent package drawings. package description 1 n 2 3 4 .150 C .157 (3.810 C 3.988) note 3 14 13 .337 C .344 (8.560 C 8.738) note 3 .228 C .244 (5.791 C 6.197) 12 11 10 9 5 6 7 n/2 8 .016 C .050 (0.406 C 1.270) .010 C .020 (0.254 C 0.508) s 45 0 C 8 typ .008 C .010 (0.203 C 0.254) s14 0502 .053 C .069 (1.346 C 1.752) .014 C .019 (0.355 C 0.483) typ .004 C .010 (0.101 C 0.254) .050 (1.270) bsc .245 min n 1 2 3 n/2 .160 .005 recommended solder pad layout .045 .005 .050 bsc .030 .005 typ inches (millimeters) note: 1. dimensions in 2. drawing not to scale 3. these dimensions do not include mold flash or protrusions. mold flash or protrusions shall not exceed .006" (0.15mm) s package 14-lead plastic small outline (narrow .150 inch) (reference ltc dwg # 05-08-1610) n package 14-lead pdip (narrow .300 inch) (reference ltc dwg # 05-08-1510) n14 1103 .020 (0.508) min .120 (3.048) min .130 .005 (3.302 0.127) .045 C .065 (1.143 C 1.651) .065 (1.651) typ .018 .003 (0.457 0.076) .005 (0.127) min .255 .015* (6.477 0.381) .770* (19.558) max 3 1 2 4 5 6 7 8910 11 1213 14 .008 C .015 (0.203 C 0.381) .300 C .325 (7.620 C 8.255) .325 +.035 C.015 +0.889 C0.381 8.255 () note: 1. dimensions are inches millimeters *these dimensions do not include mold flash or protrusions. mold flash or protrusions shall not exceed .010 inch (0.254mm) .100 (2.54) bsc
lt1638/lt1639 17 16389fg 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. revision history rev date description page number e 06/10 updates to supply voltage section 11 f 09/10 units on x-axis of g24 changed from hz to khz 10 g 10/11 updated ja values for ms8 and dd packages in pin con? guration corrected part numbers and revised column title to speci? ed temperature range in order information deleted note 10 from electrical characteristics 2 3 7 (revision history begins at rev e)
lt1638/lt1639 18 16389fg linear technology corporation 1630 mccarthy blvd., milpitas, ca 95035-7417 (408) 432-1900 fax: (408) 434-0507 www.linear.com linear technology corporation 1998 lt 1011 rev g ? printed in usa related parts typical application part number description comments lt1078/lt1079 lt2078/lt2079 dual/quad 55a max, single supply, precision op amps input/output common mode includes ground, 70v v os(max) and 2.5v/c drift (max), 200khz gbw, 0.07v/s slew rate lt1178/lt1179 lt2178/lt2179 dual/quad 17a max, single supply, precison op amps input/output common mode includes ground, 70v v os(max) and 4v/c drift (max), 85khz gbw, 0.04v/s slew rate lt1366/lt1367 dual/quad precision, rail-to-rail input and output op amps 475v v os(max) , 500v/mv a vol(min) , 400khz gbw lt1490/lt1491 dual/quad over-the-top micropower, rail-to-rail input and output op amps single supply input range: C 0.4v 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 the battery monitor in figure 5 also demonstrates the lt1638s ability to operate with its inputs above the positive rail. in this application, a conventional ampli? er would be limited to a battery voltage between 5v and ground, but the lt1638 can handle battery voltages as high as 44v. when the battery is charging, amp b senses the voltage drop across r s . the output of amp b causes q2 to drain suf? cient current through r b to balance the input of amp b. likewise, amp a and q1 form a closed loop when the battery is discharging. the current through q1 or q2 is proportional to the current in r s and this cur- rent ? ows into r g and is converted into a voltage. amp d buffers and ampli? es the voltage across r g . amp c compares the output of amp a and amp b to determine the polarity of current through r s . the scale factor for v out with s1 open is 1v/a. with s1 closed the scale factor is 1v/100ma and currents as low as 500a can be measured. 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 1638/39 f05 logic high (5v) = charging logic low (0v) = discharging r g 10k q1 2n3904 r s , 0.2 charger voltage r a ', 2k r b ' , 2k r b , 2k v batt = 12v i batt + load v out (r s )(r g /r a )(gain) v out gain i batt = = amps C + a 1/4 lt1639 C + b 1/4 lt1639 C + c 1/4 lt1639 C + d 1/4 lt1639 figure 5. battery monitor

▲Up To Search▲

Price & Availability of LT1638CDDPBF

	To Download LT1638CDDPBF Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .