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1 lt1361/lt1362 n 50mhz gain bandwidth n 800v/ m s slew rate n 5ma maximum supply current per amplifier n unity-gain stable n c-load tm op amp drives all capacitive loads n 9nv/ ? hz input noise voltage n 1mv maximum input offset voltage n 1 m a maximum input bias current n 250na maximum input offset current n 13v minimum output swing into 500 w n 3.2v minimum output swing into 150 w n 4.5v/mv minimum dc gain, r l =1k n 60ns settling time to 0.1%, 10v step n 0.2% differential gain, a v =2, r l =150 w n 0.3 differential phase, a v =2, r l =150 w n specified at 2.5v, 5v, and 15v dual and quad 50mhz, 800v/ m s op amps the lt1361/lt1362 are dual and quad low power high speed operational amplifiers with outstanding ac and dc performance. the amplifiers feature much lower supply current and higher slew rate than devices with comparable bandwidth. the circuit topology is a voltage feedback amplifier with matched high impedance inputs and the slewing performance of a current feedback amplifier. the high slew rate and single stage design provide excellent settling characteristics which make the circuit an ideal choice for data acquisition systems. each output drives a 500 w load to 13v with 15v supplies and a 150 w load to 3.2v on 5v supplies. the amplifiers are stable with any capacitive load making them useful in buffer or cable driving applications. the lt1361/lt1362 are members of a family of fast, high performance amplifiers using this unique topology and employing linear technology corporations advanced bipolar complementary processing. for a single amplifier version of the lt1361/lt1362 see the lt1360 data sheet. for higher bandwidth devices with higher supply currents see the lt1363 through lt1365 data sheets. for lower supply current amplifiers see the lt1354 to lt1359 data sheets. singles, duals, and quads of each amplifier are available. n wideband amplifiers n buffers n active filters n video and rf amplification n cable drivers n data acquisition systems cable driver frequency response 1361/1362 ta02 a v = C1 large-signal response c-load is a trademark of linear technology corporation frequency (mhz) 1 ? ? ? ? 0 gain (db) 2 100 1361/1362 ta01 10 v s = 10v v s = 5v v s = 2.5v v s = 15v + 1/2 lt1361 510 w 75 w out 75 w in 510 w applicatio s u features typical applicatio u descriptio u , ltc and lt are registered trademarks of linear technology corporation.
2 lt1361/lt1362 symbol parameter conditions v supply min typ max units v os input offset voltage (note 4) 15v 0.3 1.0 mv 5v 0.3 1.0 mv 2.5v 0.4 1.2 mv i os input offset current 2.5v to 15v 80 250 na i b input bias current 2.5v to 15v 0.3 1.0 m a e n input noise voltage f = 10khz 2.5v to 15v 9 nv/ ? hz i n input noise current f = 10khz 2.5v to 15v 0.9 pa/ ? hz r in input resistance v cm = 12v 15v 20 50 m w input resistance differential 15v 5 m w c in input capacitance 15v 3 pf total supply voltage (v + to v C ) ............................... 36v differential input voltage (transient only) (note 2)................................... 10v input voltage ............................................................ v s output short-circuit duration (note 3) ............ indefinite absolute m axi m u m ratings w ww u operating temperature range (note 8) ...C40 c to 85 c specified temperature range (note 9) ....C40 c to 85 c maximum junction temperature (see below) plastic package ................................................ 150 c storage temperature range ..................C65 c to 150 c lead temperature (soldering, 10 sec).................. 300 c package/order i n for m atio n w u u order part number order part number t jmax = 150 c, q ja = 190 c/ w t jmax = 150 c, q ja = 130 c/ w lt1361cs8 s8 part marking 1361 lt1361cn8 order part number order part number lt1362cs lt1362cn v + d 14 13 12 11 10 9 8 7 6 5 4 3 2 1 out a ?n a +in a +in b ?n b out b out c v ?n d out d top view a +in d +in c ?n c c b n package 14-lead pdip v + d 16 15 14 13 12 11 10 7 6 5 4 3 2 1 out a ?n a +in a +in b ?n b out b out c 9 8 nc nc v ?n d out d top view a +in d +in c ?n c c b s package 16-lead plastic so 8 7 6 5 4 3 2 1 in a +in a v + top view s8 package 8-lead plastic so out a out b v in b +in b a b 8 7 6 5 4 3 2 1 in a +in a v + top view n8 package 8-lead pdip out a out b v in b +in b a b t jmax = 150 c, q ja = 150 c/ w t jmax = 150 c, q ja = 110 c/ w t a = 25 c, v cm = 0v unless otherwise noted. electrical characteristics consult factory for industrial and military grade parts. (note 1)
3 lt1361/lt1362 input voltage range + 15v 12.0 13.4 v 5v 2.5 3.4 v 2.5v 0.5 1.1 v input voltage range C 15v C13.2 C12.0 v 5v C3.2 C2.5 v 2.5v C0.9 C0.5 v cmrr common mode rejection ratio v cm = 12v 15v 86 92 db v cm = 2.5v 5v 79 84 db v cm = 0.5v 2.5v 68 74 db psrr power supply rejection ratio v s = 2.5v to 15v 93 105 db a vol large-signal voltage gain v out = 12v, r l = 1k 15v 4.5 9.0 v/mv v out = 10v, r l = 500 w 15v 3.0 6.5 v/mv v out = 2.5v, r l = 500 w 5v 3.0 6.4 v/mv v out = 2.5v, r l = 150 w 5v 1.5 4.2 v/mv v out = 1v, r l = 500 w 2.5v 2.5 5.2 v/mv v out output swing r l = 1k, v in = 40mv 15v 13.5 13.9 v r l = 500 w , v in = 40mv 15v 13.0 13.6 v r l = 500 w , v in = 40mv 5v 3.5 4.0 v r l = 150 w , v in = 40mv 5v 3.2 3.8 v r l = 500 w , v in = 40mv 2.5v 1.3 1.7 v i out output current v out = 13v 15v 26 34 ma v out = 3.2v 5v 21 29 ma i sc short-circuit current v out = 0v, v in = 3v 15v 40 54 ma sr slew rate a v = C 2, (note 5) 15v 600 800 v/ m s 5v 250 350 v/ m s full power bandwidth 10v peak, (note 6) 15v 12.7 mhz 3v peak, (note 6) 5v 18.6 mhz gbw gain bandwidth f = 200khz 15v 35 50 mhz 5v 25 37 mhz 2.5v 32 mhz t r , t f rise time, fall time a v = 1, 10%-90%, 0.1v 15v 3.1 ns 5v 4.3 ns overshoot a v = 1, 0.1v 15v 35 % 5v 27 % propagation delay 50% v in to 50% v out , 0.1v 15v 5.2 ns 5v 6.4 ns t s settling time 10v step, 0.1%, a v = C1 15v 60 ns 10v step, 0.01%, a v = C1 15v 90 ns 5v step, 0.1%, a v = C1 5v 65 ns differential gain f = 3.58mhz, a v = 2, r l = 150 w 15v 0.20 % 5v 0.20 % f = 3.58mhz, a v = 2, r l = 1k 15v 0.04 % 5v 0.02 % differential phase f = 3.58mhz, a v = 2, r l = 150 w 15v 0.40 deg 5v 0.30 deg f = 3.58mhz, a v = 2, r l = 1k 15v 0.07 deg 5v 0.26 deg r o output resistance a v = 1, f = 1mhz 15v 1.4 w channel separation v out = 10v, r l = 500 w 15v 100 113 db i s supply current each amplifier 15v 4.0 5.0 ma each amplifier 5v 3.8 4.8 ma symbol parameter conditions v supply min typ max units t a = 25 c, v cm = 0v unless otherwise noted. electrical characteristics
4 lt1361/lt1362 symbol parameter conditions v supply min typ max units v os input offset voltage (note 4) 15v l 1.5 mv 5v l 1.5 mv 2.5v l 1.7 mv input v os drift (note 7) 2.5v to 15v l 912 m v/ c i os input offset current 2.5v to 15v l 350 na i b input bias current 2.5v to 15v l 1.5 m a cmrr common mode rejection ratio v cm = 12v 15v l 84 db v cm = 2.5v 5v l 77 db v cm = 0.5v 2.5v l 66 db psrr power supply rejection ratio v s = 2.5v to 15v l 91 db a vol large-signal voltage gain v out = 12v, r l = 1k 15v l 3.6 v/mv v out = 10v, r l = 500 w 15v l 2.4 v/mv v out = 2.5v, r l = 500 w 5v l 2.4 v/mv v out = 2.5v, r l = 150 w 5v l 1.0 v/mv v out = 1v, r l = 500 w 2.5v l 2.0 v/mv v out output swing r l = 1k, v in = 40mv 15v l 13.4 v r l = 500 w , v in = 40mv 15v l 12.8 v r l = 500 w , v in = 40mv 5v l 3.4 v r l = 150 w , v in = 40mv 5v l 3.1 v r l = 500 w , v in = 40mv 2.5v l 1.2 v i out output current v out = 12.8v 15v l 25 ma v out = 3.1v 5v l 20 ma i sc short-circuit current v out = 0v, v in = 3v 15v l 32 ma sr slew rate a v = C 2, (note 5) 15v l 475 v/ m s 5v l 185 v/ m s gbw gain bandwidth f = 200khz 15v l 31 mhz 5v l 22 mhz channel separation v out = 10v, r l = 500 w 15v l 98 db i s supply current each amplifier 15v l 5.8 ma each amplifier 5v l 5.6 ma electrical characteristics symbol parameter conditions v supply min typ max units v os input offset voltage (note 4) 15v l 2.0 mv 5v l 2.0 mv 2.5v l 2.2 mv input v os drift (note 7) 2.5v to 15v l 912 m v/ c i os input offset current 2.5v to 15v l 400 na i b input bias current 2.5v to 15v l 1.8 m a cmrr common mode rejection ratio v cm = 12v 15v l 84 db v cm = 2.5v 5v l 77 db v cm = 0.5v 2.5v l 66 db psrr power supply rejection ratio v s = 2.5v to 15v l 90 db a vol large-signal voltage gain v out = 12v, r l = 1k 15v l 2.5 v/mv v out = 10v, r l = 500 w 15v l 1.5 v/mv v out = 2.5v, r l = 500 w 5v l 1.5 v/mv v out = 2.5v, r l = 150 w 5v l 0.6 v/mv v out = 1v, r l = 500 w 2.5v l 1.3 v/mv the l denotes the specifications which apply over the temperature range C 40 c t a 85 c, v cm = 0v unless otherwise noted. (note 9) the l denotes the specifications which apply over the temperature range 0 c t a 70 c, v cm = 0v unless otherwise noted.
5 lt1361/lt1362 symbol parameter conditions v supply min typ max units v out output swing r l = 1k, v in = 40mv 15v l 13.4 v r l = 500 w , v in = 40mv 15v l 12.0 v r l = 500 w , v in = 40mv 5v l 3.4 v r l = 150 w , v in = 40mv 5v l 3.0 v r l = 500 w , v in = 40mv 2.5v l 1.2 v i out output current v out = 12.0v 15v l 24 ma v out = 3.0v 5v l 20 ma i sc short-circuit current v out = 0v, v in = 3v 15v l 30 ma sr slew rate a v = C 2, (note 5) 15v l 450 v/ m s 5v l 175 v/ m s gbw gain bandwidth f = 200khz 15v l 30 mhz 5v l 20 mhz channel separation v out = 10v, r l = 500 w 15v l 98 db i s supply current each amplifier 15v l 6.0 ma each amplifier 5v l 5.8 ma typical perfor m a n ce characteristics u w input common mode range vs supply voltage supply voltage ( v) 1 supply current (ma) 3 2 6 5 4 10 5 01520 1361/1362 g01 ?5 c 25 c 125 c supply current vs supply voltage and temperature input bias current vs input common mode voltage input common mode voltage (v) 0 input bias current ( m a) 0.2 0.1 0.6 0.5 0.4 0.3 ?5 ?0 0 10 15 5 ? 1361/1362 g03 v s = 15v t a = 25 c i b = ? ? i b + + i b 2 note 1: absolute maximum ratings are those values beyond which the life of a device may be impaired. note 2: differential inputs of 10v are appropriate for transient operation only, such as during slewing. large, sustained differential inputs will cause excessive power dissipation and may damage the part. see input considerations in the applications information section of this data sheet for more details. note 3: a heat sink may be required to keep the junction temperature below absolute maximum when the output is shorted indefinitely. note 4: input offset voltage is pulse tested and is exclusive of warm-up drift. note 5: slew rate is measured between 10v on the output with 6v input for 15v supplies and 1v on the output with 1.75v input for 5v supplies. note 6: full power bandwidth is calculated from the slew rate measurement: fpbw = sr/2 p v p . note 7: this parameter is not 100% tested. note 8: the lt1361c/lt1362c are guaranteed functional over the operating temperature range of C40 c to 85 c. note 9: the lt1361c/lt1362c are guaranteed to meet specified performance from 0 c to 70 c. the lt1361c/lt1362c 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. for guaranteed i-grade parts, consult the factory. supply voltage ( v) v common mode range (v) 2.0 0.5 1.0 1.5 v + 1.0 0.5 2.0 1.5 10 5 01520 1361/1362 g02 t a = 25 c d v os < 1mv electrical characteristics the l denotes the specifications which apply over the temperature range C40 c t a 85 c, v cm = 0v unless otherwise noted. (note 9)
6 lt1361/lt1362 typical perfor m a n ce characteristics u w settling time vs output step (noninverting) frequency (hz) 10 1 input voltage noise (nv/ ? hz) 10 i n 100 0.1 input current noise (pa/ ? hz) 1 10 e n 1k 100 100k 10k 1361/1362 g05 v s = 15v t a = 25 c a v = 101 r s = 100k open-loop gain vs resistive load temperature ( c) 0 input bias current ( m a) 0.2 0.1 0.7 0.6 0.5 0.3 0.4 50 ?5 25 100 125 50 75 0 1361/1362 g04 v s = 15v i b = ? ? i b + + i b 2 input bias current vs temperature input noise spectral density open-loop gain vs temperature temperature ( c) 72 open-loop gain (db) 74 73 81 80 79 78 76 75 77 50 ?5 25 100 125 50 75 0 1361/1362 g07 v s = ?5v v o = ?2v r l = 1k output voltage swing vs supply voltage output voltage swing vs load current temperature ( c) 35 output short-circuit current (ma) 40 70 65 60 50 45 55 50 ?5 25 100 125 50 75 0 1361/1362 g10 v s = 5v source sink output short-circuit current vs temperature load resistance ( w ) 10 60 open-loop gain (db) 65 85 100 10k 1361/1362 g06 75 70 1k 80 v s = 5v v s = 15v t a = 25 c supply voltage ( v) v output voltage swing (v) 1 2 3 v + ? ? ? 10 5 01520 1361/1362 g08 r l = 1k t a = 25? r l = 500 w r l = 500 w r l = 1k output current (ma) output voltage swing (v) 1.0 1.5 0.5 v + v 0.5 1.0 1.5 2.0 2.0 50 40 ?0 30 40 50 01020 ?0 ?0 1361/1362 g09 v s = 5v v in = 100mv 85 c 85 c 25 c 25 c ?0 c ?0 c settling time (ns) ?0 output step (v) ? ? ? 10 8 6 4 ? 2 0 0 40 80 100 60 20 1361/1362 g11 v s = 15v a v = 1 r l = 1k 10mv 10mv 1mv 1mv settling time (ns) ?0 output step (v) ? ? ? 10 8 6 4 ? 2 0 0 40 80 100 60 20 1361/1362 g12 v s = 15v a v = ? r f = 1k c f = 3pf 10mv 10mv 1mv 1mv settling time vs output step (inverting)
7 lt1361/lt1362 typical perfor m a n ce characteristics u w output impedance vs frequency gain bandwidth and phase margin vs temperature temperature ( c) 30 gain bandwidth (mhz) 40 80 70 50 60 0 phase margin (deg) 5 10 50 45 35 40 20 25 15 30 50 ?5 25 100 125 50 75 0 1361/1362 g16 phase margin v s = 5v gain bandwidth v s = 5v phase margin v s = 15v gain bandwidth v s = 15v frequency (hz) 10k 0.01 output impedance ( w ) 0.1 100 100k 100m 1361/1362 g13 1m 1 10m 10 a v = 100 a v = 10 a v = 1 v s = 15v t a = 25 c common mode rejection ratio vs frequency frequency (hz) 0 common-mode rejection ratio (db) 40 20 120 100 80 60 1k 100m 10m 1m 100k 10k 1361/1362 g20 v s = 15v t a = 25 c gain bandwidth and phase margin vs supply voltage supply voltage ( v) 30 gain bandwidth (mhz) 50 40 80 70 60 30 phase margin (deg) 38 34 50 48 44 40 36 32 46 42 10 5 01520 1361/1362 g15 t a = 25 c phase margin gain bandwidth frequency (hz) 0 power supply rejection ratio (db) 40 20 100 80 60 100k 1m 1k 10k 100 10m 100m 1361/1362 g19 v s = 15v t a = 25 c +psrr psrr frequency response vs capacitive load frequency (hz) 1m ? voltage magnitude (db) ? ? 12 100m 1361/1362 g18 4 0 10m 8 ? 6 2 10 v s = 15v t a = 25 c a v = ? c = 1000pf c = 500pf c = 100pf c = 50pf c = 0 frequency (hz) 100k ?20 crosstalk (db) ?00 ?10 ?0 1m 100m 1361/1362 g21 ?0 ?0 10m ?0 ?0 ?0 ?0 ?0 t a = 25 c a v = 1 v in = 0dbm v s = ?5v r l = 1k v s = 5v r l = 500 w crosstalk vs frequency frequency (hz) 10k ?0 gain (db) 0 70 100k 100m 1361/1362 g14 1m 30 40 10 20 10m 50 60 phase (deg) 120 40 60 0 20 80 100 v s = 15v v s = 5v v s = 5v gain v s = 15v phase t a = 25? a v = ? r f = r g = 1k gain and phase vs frequency power supply rejection ratio vs frequency frequency (hz) 100k ? gain (db) ? ? 5 1m 100m 1361/1362 g17 1 ? 10m 3 ? 2 0 4 5v 15v 2.5v t a = 25 c a v = 1 r l = 1k frequency response vs supply voltage (a v = 1)
8 lt1361/lt1362 typical perfor m a n ce characteristics u w supply voltage ( v) 0 slew rate (v/ m s) 600 400 200 2000 1800 1600 1400 1200 1000 800 015 10 5 1361/1362 g22 t a = 25 c a v = ? r f = r g = 1k sr = sr + + sr 2 slew rate vs input level slew rate vs temperature temperature ( c) 200 slew rate (v/ m s) 400 300 1000 900 800 500 600 700 50 ?5 25 100 125 50 75 0 1361/1362 g23 sr + + sr sr = ? 2 v s = 5v v s = 15v a v = ? total harmonic distortion vs frequency frequency (hz) 10 0.0001 total harmonic distortion (%) 0.01 100 100k 1361/1362 g25 1k 0.001 10k a v = ? a v = 1 t a = 25 c v o = 3v rms r l = 500 w frequency (hz) 100k 1m 0 output voltage (v p-p ) 30 10m 1361/1362 g26 15 5 10 25 20 a v = ? a v = 1 v s = 15v r l = 1k a v = 1, 1% max distortion a v = ?, 2% max distortion undistorted output swing vs frequency ( 15v) undistorted output swing vs frequency ( 5v) frequency (hz) 100k 1m 0 output voltage (v p-p ) 10 10m 1361/1362 g27 6 2 4 8 a v = ? a v = 1 v s = 5v r l = 1k 2% max distortion slew rate vs supply voltage 2nd and 3rd harmonic distortion vs frequency frequency (hz) 100k 200k 400k ?0 ?0 ?0 ?0 ?0 ?0 harmonic distortion (db) ?0 10m 1361/1362 g28 1m 2m 4m v s = 15v v o = 2v p-p r l = 500 w a v = 2 3rd harmonic 2nd harmonic capacitive load (f) 10p 0 overshoot (%) 100 1 m 1361/1362 g30 1000p 0.01 m 50 100p 0.1 m a v = 1 a v = ? t a = 25 c v s = 15v capacitive load handling input level (v p-p ) 0 slew rate (v/ m s) 400 600 200 2000 1800 1600 1400 800 1200 1000 0 8 16 20 12 4 21018 14 6 1361/1362 g24 t a = 25 c v s = 15v a v = ? r f = r g = 1k sr = sr + + sr 2 differential gain and phase vs supply voltage supply voltage (v) 0.28 differential phase (deg) 0.36 0.32 0.40 differential gain (%) 0.50 0.25 0 10 5 15 1361/1362 g29 differential gain differential phase a v = 2 r l = 150 w t a = 25 c
9 lt1361/lt1362 small-signal transient (a v = 1) typical perfor m a n ce characteristics u w small-signal transient (a v = C1) small-signal transient (a v = C1, c l = 500pf) 1361/1362 ta31 1361/1362 ta32 1361/1362 ta33 large-signal transient (a v = 1, c l = 10,000pf) large-signal transient (a v = C1) large-signal transient (a v = 1) 1361/1362 ta36 1361/1362 ta34 1361/1362 ta35 applicatio n s i n for m atio n wu u u layout and passive components the lt1361/lt1362 amplifiers are easy to use and toler- ant of less than ideal layouts. for maximum performance (for example, fast 0.01% settling) use a ground plane, short lead lengths, and rf-quality bypass capacitors (0.01 m f to 0.1 m f). for high drive current applications use low esr bypass capacitors (1 m f to 10 m f tantalum). the parallel combination of the feedback resistor and gain setting resistor on the inverting input combine with the input capacitance to form a pole which can cause peaking or oscillations. if feedback resistors greater than 5k w are used, a parallel capacitor of value c f > r g x c in /r f should be used to cancel the input pole and optimize dynamic performance. for unity-gain applications where a large feedback resistor is used, c f should be greater than or equal to c in . input considerations each of the lt1361/lt1362 inputs is the base of an npn and a pnp transistor whose base currents are of opposite polarity and provide first-order bias current cancellation. because of variation in the matching of npn and pnp beta, the polarity of the input bias current can be positive or negative. the offset current does not depend on npn/pnp beta matching and is well controlled. the use of balanced source resistance at each input is recommended for applications where dc accuracy must be maximized. the inputs can withstand transient differential input volt- ages up to 10v without damage and need no clamping or source resistance for protection. differential inputs, how- ever, generate large supply currents (tens of ma) as required for high slew rates. if the device is used with sustained differential inputs, the average supply current will increase, excessive power dissipation will result and the part may be damaged. the part should not be used as a comparator, peak detector or other open-loop applica-
10 lt1361/lt1362 tion with large, sustained differential inputs . under normal, closed-loop operation, an increase of power dis- sipation is only noticeable in applications with large slewing outputs and is proportional to the magnitude of the differential input voltage and the percent of the time that the inputs are apart. measure the average supply current for the application in order to calculate the power dissipa- tion. capacitive loading the lt1361/lt1362 are stable with any capacitive load. this is accomplished by sensing the load induced output pole and adding compensation at the amplifier gain node. as the capacitive load increases, both the bandwidth and phase margin decrease so there will be peaking in the frequency domain and in the transient response as shown in the typical performance curves. the photo of the small signal response with 500pf load shows 60% peaking. the large signal response shows the output slew rate being limited to 5v/ m s by the short-circuit current. coaxial cable can be driven directly, but for best pulse fidelity a resistor of value equal to the characteristic impedance of the cable (i.e., 75 w ) should be placed in series with the output. the other end of the cable should be terminated with the same value resistor to ground. circuit operation the lt1361/lt1362 circuit topology is a true voltage feedback amplifier that has the slewing behavior of a current feedback amplifier. the operation of the circuit can be understood by referring to the simplified schematic. the inputs are buffered by complementary npn and pnp emitter followers which drive a 500 w resistor. the input voltage appears across the resistor generating currents which are mirrored into the high impedance node. comple- mentary followers form an output stage which buffers the gain node from the load. the bandwidth is set by the input resistor and the capacitance on the high impedance node. the slew rate is determined by the current available to charge the gain node capacitance. this current is the differential input voltage divided by r1, so the slew rate is proportional to the input. highest slew rates are therefore seen in the lowest gain configurations. for example, a 10v output step in a gain of 10 has only a 1v input step, applicatio n s i n for m atio n wu u u whereas the same output step in unity gain has a 10 times greater input step. the curve of slew rate vs input level illustrates this relationship. the lt1361/lt1362 are tested for slew rate in a gain of C2 so higher slew rates can be expected in gains of 1 and C1, and lower slew rates in higher gain configurations. the rc network across the output stage is bootstrapped when the amplifier is driving a light or moderate load and has no effect under normal operation. when driving a capacitive load (or a low value resistive load) the network is incompletely bootstrapped and adds to the compensa- tion at the high impedance node. the added capacitance slows down the amplifier which improves the phase margin by moving the unity-gain frequency away from the pole formed by the output impedance and the capacitive load. the zero created by the rc combination adds phase to ensure that even for very large load capacitances, the total phase lag can never exceed 180 degrees (zero phase margin) and the amplifier remains stable. power dissipation the lt1361/lt1362 combine high speed and large output drive in small packages. because of the wide supply voltage range, it is possible to exceed the maximum junction temperature under certain conditions. maximum junction temperature (t j ) is calculated from the ambient temperature (t a ) and power dissipation (p d ) as follows: lt1361cn8: t j = t a + (p d x 130 c/w) lt1361cs8: t j = t a + (p d x 190 c/w) lt1362cn: t j = t a + (p d x 110 c/w) lt1362cs: t j = t a + (p d x 150 c/w) worst case power dissipation occurs at the maximum supply current and when the output voltage is at 1/2 of either supply voltage (or the maximum swing if less than 1/2 supply voltage). for each amplifier p dmax is: p dmax = (v + C v C )(i smax ) + (v + /2) 2 /r l example: lt1362 in s16 at 70 c, v s = 5v, r l = 100 w p dmax = (10v)(5.6ma) + (2.5v) 2 /100 w = 119mw t jmax = 70 c + (4 x 119mw)(150 c/w) = 141 c
11 lt1361/lt1362 1361/1362 ss01 out +in ?n v + v r1 500 w c c r c c sche atic w w si plified dimension in inches (millimeters) unless otherwise noted. package descriptio n 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. 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) 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 0.009 ?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 () 0.255 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 *these dimensions do not include mold flash or protrusions. mold flash or protrusions shall not exceed 0.010 inch (0.254mm) n8 package 8-lead pdip (narrow 0.300) (ltc dwg # 05-08-1510) n package 14-lead pdip (narrow 0.300) (ltc dwg # 05-08-1510)
12 lt1361/lt1362 13612fa lt/tp 0400 2k rev a ? printed in usa ? linear technology corporation 1994 dimension in inches (millimeters) unless otherwise noted. package descriptio n u typical applicatio n s u two op amp instrumentation amplifier 1mhz, 4th order butterworth filter 1361/1362 ta03 v in trim r5 for gain trim r1 for common-mode rejection bw = 500khz r1 10k r2 1k r5 220 w r4 10k r3 1k v out + + + 1/2 lt1361 1/2 lt1361 gain r r r r r r rr r = ? ? + ? ? ? ? + ? ? ? ? + + () ? ? = 4 3 1 1 2 2 1 3 4 23 5 102 1361/1362 ta04 v in 1.1k 2.21k 22pf 909 w 47pf 470pf v out + + 1.1k 2.67k 909 w 220pf 1/2 lt1361 1/2 lt1361 s8 package 8-lead plastic small outline (narrow 0.150) (ltc dwg # 05-08-1610) s package 16-lead plastic small outline (narrow 0.150) (ltc dwg # 05-08-1610) part number description comments lt1360 50mhz, 800v/ m s op amp single version of lt1361/lt1362 lt1364/lt1365 dual and quad 70mhz, 1000v/ m s op amps faster version of lt1361/lt1362, v os = 1.5mv, i s = 6.3ma/amplifier lt1358/lt1359 dual and quad 25mhz, 600v m s op amps lower power version of lt1361/lt1362, v os = 0.6mv, i s = 2ma/amplifier lt1813 dual 100mhz, 700v/ m s op amps low voltage, low power lt1361, i s = 3ma/amplifier related parts 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) s16 1098 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 5 6 7 8 0.150 ?0.157** (3.810 ?3.988) 16 15 14 13 0.386 ?0.394* (9.804 ?10.008) 12 11 10 9 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 * ** 0.228 ?0.244 (5.791 ?6.197) 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 * ** linear technology corporation 1630 mccarthy blvd., milpitas, ca 95035-7417 (408) 432-1900 l fax: (408) 434-0507 l www.linear-tech.com

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