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1 lt1019 precision reference s f ea t u re d u escriptio the lt1019 is a third generation bandgap voltage refer- ence utilizing thin film technology and a greatly improved curvature correction technique. wafer level trimming of both reference and output voltage combines to produce units with high yields to very low tc and tight initial tolerance of output voltage. the lt1019 can both sink and source up to 10ma and can be used in either the series or shunt mode. this allows the reference to be used for both positive and negative output voltages without external components. minimum input/ output voltage is less than 1v in the series mode, providing improved tolerance of low line conditions. the lt1019 is available in four voltages: 2.5v, 4.5v, 5v, and 10v. it is a direct replacement for most bandgap references presently available including ad580, ad581, ref-01, ref-02, mc1400, mc1404, and lm168. for ultra-low drift applications (< 2ppm/ c), the lt1019 can be operated in a heated mode by driving an internal resistor with an external amplifier. chip temperature can be externally set for minimum power consumption. n available at 2.5v, 4.5v, 5v, and 10v n plug-in replacement for present references n ultra-low drift: 3ppm/ c typical n curvature corrected n series or shunt operation n ultra-high line rejection: ? 0.5ppm/v n low output impedance: ? 0.02 w n tight initial output voltage: < 0.05% n can be heated for drifts below 2ppm/ c n 100% noise tested n temperature output n a/d and d/a converters n precision regulators n constant current sources n v/f converters n bridge excitation u s a o pp l ic at i u a o pp l ic at i ty p i ca l ultralinear strain guage temperature (?c) ?0 output voltage (normalized) (v) 1.001 1.002 1.003 25 75 lt1019 ?ta02 1.000 0.999 ?5 0 50 100 125 0.998 0.997 10ppm/ c full temp range ?ox 5ppm/ c 0 c to 70 c ?ox? lt1019 curve uncompensated ?tandard?bandgap drift curve output voltage drift + a1 ? lt301a + a2 lt1001 r3 2m r2 20k r4 20k gain = 100 r5 2m r6** 2m in lt1019-5 gnd out 15v 5v 357 w * 0.5w active element 350 w bridge 15v ?v 357 w * 0.5w reduces reference and amplifier loading to ? 0. if r6 = r3, bridge is not loaded by r2 and r4. a1 v os and drift are not critical because a2 acts as a differential amplifier. * ** ? lt1019 ?ta01
2 lt1019 a u g w a w u w a r b s o lu t exi t i s input voltage .......................................................... 40v output voltage (note 1) lt1019-5, lt1019-10 ........................................ 16v lt1019-2.5, lt1019-4.5 ...................................... 7v output short-circuit duration (note 1) v in < 20v .................................................... indefinite 20v v in 35v ............................................. 10 sec trim pin voltage ................................................... 30v temp pin voltage ..................................................... 5v heater voltage continuous ......................................................... 18v intermittent (30 sec) ........................................... 32v storage temperature range ................ C 65 c to 150 c lead temperature (soldering, 10 sec)................. 300 c wu u package / o rder i for atio v in = 15v, i out = 0, t j = 25 c, unless otherwise noted. e lectr ic al c c hara terist ics lt1019a lt1019 symbol parameter conditions min typ max min typ max units output voltage tolerance 0.002 0.05 0.02 0.2 % tc output voltage lt1019c (0 c to 70 c) l 3 5 5 20 ppm/ c temperature coefficient lt1019m (C 55 c to 125 c) l 5 10 8 25 ppm/ c (note 2) lt1019i (C 40 c to 85 c) l 5 20 ppm/ c d v out line regulation (note 3) (v out + 1.5v) v in 40v 0.5 3 0.5 3 ppm/v d v in l 1.0 5 1.0 5 ppm/v rr ripple rejection 50hz f 400hz 90 110 90 110 db l 84 84 db s8 part marking order part number lt1019acn8-10 lt1019cn8-10 lt1019cs8-10 lt1019in8-10 lt1019acn8-5 lt1019cn8-5 lt1019cs8-5 lt1019in8-5 1 2 3 4 8 7 6 5 top view nc* input temp gnd nc* heater output trim n8 package 8-lead plastic dip *internally connected. do not connect externally. s8 package 8-lead plastic soic t jmax = 100 c, q ja = 130 c/ w (n) t jmax = 100 c, q ja = 130 c/ w (s) lt1019acn8-4.5 lt1019cn8-4.5 lt1019cs8-4.5 lt1019in8-4.5 lt1019acn8-2.5 lt1019cn8-2.5 lt1019cs8-2.5 lt1019in8-2.5 t jmax = 150 c, q ja = 150 c/ w, q jc = 45 c/w lt1019amh-10 lt1019mh-10 lt1019ach-10 lt1019ch-10 lt1019amh-5 lt1019mh-5 lt1019amh-2.5 lt1019mh-2.5 lt1019ach-2.5 lt1019ch-2.5 lt1019ach-5 lt1019ch-5 lt1019amh-4.5 lt1019mh-4.5 lt1019ach-4.5 lt1019ch-4.5 top view heater nc* nc* input output trim temp gnd (case) 8 7 6 5 3 2 1 4 h package 8-lead to-5 metal can *internally connected. do not connect externally order part number 1910 1905 1945 1925
3 lt1019 v in = 15v, i out = 0, t j = 25 c, unless otherwise noted. e lectr ic al c c hara terist ics ltc1019a ltc1019 symbol parameter conditions min typ max min typ max units d v out load regulation series 0 i out 10ma* 0.02 0.05 0.02 0.05 mv/ma ( w ) d i out mode (notes 3, 4) l 0.08 0.08 mv/ma ( w ) load regulation, 1ma i shunt 10ma (notes 4, 5) shunt mode 2.5v, 4.5v, 5v l 0.1 0.4 0.1 0.4 mv/ma ( w ) 10v l 0.8 0.8 mv/ma ( w ) thermal regulation (note 6) d p = 200mw, t = 50ms 0.1 0.5 0.1 0.5 ppm/mw i q quiescent current 0.65 1.0 0.65 1.2 ma series mode l 1.3 1.5 ma minimum shunt current (note 7) l 0.5 0.8 0.5 0.8 ma minimum input/output i out 1ma l 0.9 1.1 0.9 1.1 v voltage differential i out = 10ma l 1.3 1.3 v trim range lt1019-2.5 3.5 6 3.5 6% lt1019-5 3.5 5, C 13 3.5 5, C 13 % lt1019-10 3.5 5, C 27 3.5 5, C 27 % heater resistance 300 400 500 300 400 500 w i sc short-circuit current 2v v in 35v 15 25 50 15 25 50 ma output connected to gnd l 10 10 ma e n output voltage noise 10hz f 1khz 2.5 4 2.5 4 ppm (rms) (note 9) 0.1hz f 10hz 2.5 2.5 ppm (p-p) the l denotes specifications which apply over the full operating temperature range. note 1: these are high power conditions and are therefore guaranteed only at temperatures equal to or below 70 c. input is either floating, tied to output, or held higher than output. note 2: output voltage drift is measured using the box method. output voltage is recorded at t min , 25 c, and t max . the lowest of these three readings is subtracted from the highest and the resultant difference is divided by (t max C t min ). note 3: line regulation and load regulation are measured on a pulse basis with low duty cycle. effects due to die heating must be taken into account separately. see thermal regulation and application section. note 4: load regulation is measured at a point 1/8" below the base of the package with kelvin contacts. note 5: shunt regulation is measured with the input floating. this parameter is also guaranteed with the input connected (v in C v out ) > 1v, 0ma i sink 10ma. shunt and sink current flow into the output. note 6: thermal regulation is caused by die temperature gradients created by load current or input voltage changes. this effect must be added to normal line or load regulation. note 7: minimum shunt current is measured with shunt voltage held 20mv below the value measured at 1ma shunt current. note 8: minimum input/output voltage is measured by holding input voltage 0.5v above the nominal output voltage, while measuringv in C v out . note 9: rms noise is measured with a single highpass filter at 10hz and a 2-pole lowpass filter at 1khz. the resulting output is full-wave rectified and then integrated for a fixed period, making the final reading an average as opposed to rms. a correction factor of 1.1 is used to convert from average to rms, and a second correction of 0.88 is used to correct the non-ideal bandpass of the filters.
4 lt1019 cc hara terist ics uw a t y p i ca lper f o r c e quiescent current (lt1019-10) quiescent current (lt1019-2.5) input voltage (v) 0 current (ma) 0.8 1.0 1.2 40 lt1019 ?tpc01 0.6 0.4 0 10 20 30 0.2 1.6 1.4 35 5 15 25 45 125? 25? 55? input voltage (v) 0 current (ma) 0.8 1.0 1.2 40 lt1019 ?tpc03 0.6 0.4 0 10 20 30 0.2 1.6 1.4 35 5 15 25 45 125? 25? 55? minimum input/output voltage differential load regulation ripple rejection output curent (ma) ?0 output change (mv) 1.0 2.0 6 lt1019 ?tpc05 0 1.0 2.0 ? ? 2 10 0.5 1.5 0.5 1.5 4 ? ? 0 8 sinking sourcing t j = 25? lt1019-10 lt1019-4.5/lt1019-5 lt1019-2.5 frequency (hz) 60 input voltage/output voltage (db) 70 90 110 120 10 1k 10k 1m lt1019 ?tpc06 50 100 100k 100 80 40 lt1019-10 lt1019-4.5 lt1019-5 lt1019-2.5 t j = 25? shunt mode characteristics (lt1019-10) shunt mode characteristics (lt1019-5) shunt mode characteristics (lt1019-2.5) output-to-ground voltage (v) 0 0 current (ma) 0.1 0.3 0.4 0.5 1.0 0.7 1.0 2.0 2.5 lt1019 ?tpc07 0.2 0.8 0.9 0.6 0.5 1.5 3.0 3.5 4.0 input open t j = 125? t j = 25? t j = 55? output-to-ground voltage (v) 0 0 current (ma) 0.1 0.3 0.4 0.5 1.0 0.7 2 4 5 lt1019 ?tpc08 0.2 0.8 0.9 0.6 13 6 7 8 input open t j = 55? t j = 125? t j = 25? input voltage (v) 0 current (ma) 0.8 1.0 1.2 40 lt1019 ?tpc02 0.6 0.4 0 10 20 30 0.2 1.6 1.4 35 5 15 25 45 125? 25? 55? quiescent current (lt1019-4.5/lt1019-5) output-to-ground voltage (v) 0 0 current (ma) 0.1 0.3 0.4 0.5 1.0 0.7 4 8 10 lt1019 ?tpc09 0.2 0.8 0.9 0.6 26 12 14 16 input open t j = 55? t j = 125? t j = 25? input/output voltage (v) 0 0 output current (ma) 2.5 7.5 10 0.4 0.8 1.0 1.8 lt1019 ?tpc04 5.0 0.2 0.6 1.2 1.4 1.6 t j = 25? t j = 55? t j = 125?
5 lt1019 cc hara terist ics uw a t y p i ca lper f o r c e junction temperature (?) ?0 0.40 voltage (v) 0.45 0.55 0.60 0.65 0.90 0.75 0 50 75 lt1019 ?tpc10 0.50 0.80 0.85 0.70 ?5 25 100 125 temp pin voltage input voltage (v) 0 ?0 output voltage change ( m v) ?0 0 20 40 140 80 10 20 25 lt1019 ?tpc11 ?0 100 120 60 515 30 35 40 lt1019-2.5 lt1019-5 i out t j = 25? lt1019-10 line regulation lt1019-2.5* stability with output capacitance * lt1019-4.5/lt1019-5/lt1019-10 are stable with all load capacitance. + v in 1.188v v out gnd r2 lt1019-4.5, lt1019-5, lt1019-10 = 5k lt1019-2.5 = 10k r3 80k trim heater 400 w lt1019-2.5 = 11k lt1019-4.5 = 13.9k lt1019-5 = 16k lt1019-10 = 37.1k r1 lt1019 ?bd block diagra w applicatio s i for atio uu w u line and load regulation line regulation on the lt1019 is nearly perfect. a 10v change in input voltage causes a typical output shift of less than 5ppm. load regulation (sourcing current) is nearly as good. a 5ma change in load current shifts output voltage by only 100 m v. these are electrical effects, measured with low duty cycle pulses to eliminate heating effects. in real world applications, the thermal effects of load and line changes must be considered. two separate thermal effects are evident in monolithic circuits. one is a gradient effect, where power dissipation on the die creates temperature gradients. these gradients can cause output voltage shifts even if the overall tempera- ture coefficient of the reference is zero . the lt1019, unlike previous references, specifies thermal regulation caused by die temperature gradients.the specification is 0.5ppm/ mw. to calculate the effect on output voltage, simply multiply the change in device power dissipation by the output current (ma) 0.01 output capacitor ( m f) 0.1 20 0 10 lt1019 ?tpc12 0.001 10 20 0.0001 1 10 15 5 5 15 sink current source current region of possible instability
6 lt1019 thermal regulation specification. example: a 10v device with a nominal input voltage of 15v and load current of 5ma. find the effect of an input voltage change of 1v and a load current change of 2ma. d p (line change) = ( d v in )(i load ) = (1v)(5ma) = 5ma d v out = (0.5ppm/mw)(5mw) = 2.5ppm d p (load change) = ( d i load )(v in C v out ) = (2ma)(5v) = 10mw d v out = (0.5ppm/mw)(10mw) = 5ppm even though these effects are small, they should be taken into account in critical applications, especially where input voltage or load current is high. the second thermal effect is overall die temperature change. the magnitude of this change is the product of change in power dissipation times the thermal resistance ( q ja ) of the ic package @ (100 c/w C 150 c/w). the effect on reference output is calculated by multiplying die temperature change by the temperature drift specification of the reference. example: same conditions as above with q ja = 150 c/w and an lt1019 with 20ppm/ c drift specification. d p (line change) = 5mw d v out = (5mw)(150 c/w)(20ppm/ c) = 15ppm d p (load change) = 10mw d v out = (10mw)(150 c/w)(20ppm/ c) = 30ppm these calculations show that thermally induced output voltage variations can easily exceed the electrical effects. in critical applications where shifts in power dissipation are expected, a small clip-on heat sink can significantly improve these effects by reducing overall die temperature change. alternately, an lt1019a can be used with four times lower tc. if warm-up drift is of concern, these measures will also help. with warm-up drift, total device power dissipation must be considered. in the example given, warm-up drift (worst case) is equal to: warm-up drift = [(v in )(i q ) + (v in C v out )(i load )] [( q ja )(tc)] with iq (quiescent current) = 0.6ma, warm-up drift = [(15v)(0.6ma) + (5v)(5ma)] [(150 c/w)(25ppm/ c)] = 127.5ppm note that 74% of the warm-up drift is due to load current times input/output differential. this emphasizes the im- portance of keeping both these numbers low in critical applications. with heavy loads, warm-up drift can also be improved using the technique described under driving loads above 10ma or by heat sinking. note that line regulation is now affected by reference output impedance. r1 should have a wattage rating high enough to withstand full input voltage if output shorts must be tolerated. even with load currents below 10ma, r1 can be used to reduce power dissipation in the lt1019 for lower warm-up drift, etc. output trimming output voltage trimming on the lt1019 is nominally accomplished with a potentiometer connected from out- put to ground with the wiper tied to the trim pin. the lt1019 was made compatible with existing references, so the trim range is large: + 6%, C 6% for the lt1019-2.5, + 5%, C 13% for the lt1019-5, and + 5%, C 27% for the lt1019-10. this large trim range makes precision trim- ming rather difficult. one solution is to insert resistors in series with both ends of the potentiometer. this has the disadvantage of potentially poor tracking between the fixed resistors and the potentiometer. a second method of reducing trim range is to insert a resistor in series with the wiper of the potentiometer. this works well only for very small trim range because of the mismatch in tcs between the series resistor and the internal thin film resistors. these film resistors can have a tc as high as 500ppm/ c. that same tc is then transferred to the change in output voltage: a 1% shift in output voltage causes a (500ppm)(1%) = 5ppm/ c change in output voltage drift. applicatio s i for atio uu w u
7 lt1019 the worst case error in initial output voltage for the lt1019 is 0.2%, so a series resistor is satisfactory if the output is simply trimmed to nominal value. the maximum tc shift expected would be 1ppm/ c. using the temp pin the lt1019 has a temp pin like several other bandgap references. the voltage on this pin is directly propor- tional to absolute temperature (ptat) with a slope of ? 2.1mv/ c. room temperature voltage is therefore ? (295 k)(2.1mv/ c) = 620mv. previous bandgap ref- erences have been very sensitive to any loading on the temp pin because it is an integral part of the reference core itself. the lt1019 taps the core at a special point which has much less effect on the reference. the relationship between temp pin loading and a change in reference output voltage is less than 0.05%/ m a, about ten times improvement over previous references. output bypassing the lt1019 is designed to be stable with a wide range of load currents and output capacitors. the 4.5v, 5v, and 10v devices do not oscillate under any combination of capacitance and load. the 2.5v device can oscillate when sinking currents between 1ma and 6ma for load capaci- tance between 400pf and 2 m f (see figure 1). if output bypassing is desired to reduce high frequency output impedance, keep in mind that loop phase margin is significantly reduced for output capacitors between 500pf and 1 m f if the capacitor has low esr (effective series resistance). this can make the output ring with tran- sient loads. the best transient load response is obtained by deliberately adding a resistor to increase esr as shown in figure 1. v in 2 w to 5 w lt1019 lt1019 ?f01 + 2 m f tantalum v in lt1019 + 2 m f to 10 m f tantalum 2 w to 5 w (a) (b) figure 1. output bypassing use configuration (a) if dc voltage error cannot be com- promised as load current changes. use (b) if absolute minimum peak perturbation at the load is needed. for best transient response, the output can be loaded with 3 1ma dc current. applicatio s i for atio uu w u typical applicatio s u wide range trim 3 5% narrow trim range ( 0.2%) v out r1 100k out in lt1019 trim gnd v in lt1019 ?ta05 r2* 1.5m *increase to 4.7m for lt1019a (0.05%) v out r1 25k out in lt1019 trim gnd v in lt1019 ?ta03
8 lt1019 typical applicatio s u trimming lt1019-5 output to 5.120v trimming lt1019-10 output to 10.240v v out 5k* ?% trim out in lt1019-5 trim gnd v in lt1019 ?ta04 4.02k 1% 41.2k 1% *low tc cermit v out 5k* 1% trim out in lt1019-10 trim gnd v in lt1019 ?ta06 4.02k 1% 90.9k 1% *low tc cermet output current boost with current limit v out 11v compliance in out lt1019-2.5 trim gnd + 15v 11.5k 1% 5k* 8.25k 1% 2.49m 1% i out = 1ma z out 3 1011 w lt1012 *low tc cermet, trim range = 1.5% lt1019 ?ta07 lt1019 out gnd in d1* r1* v + r2* ? ref at 50ma lt1019 ?ta10 *r1 = v + ?5v 2ma , r2 = v ?v ref 1ma , d1 = v ref + 5v q1 2n2905 negative series reference precision 1 m a current source r1 220 w in lt1019 out gnd lt1019 ?ta08 2 m f solid tantalum i load 100ma 8.2 w glows in current limit (do not omit) led v + 3 (v out + 2.8v) 2n2905
9 lt1019 typical applicatio s u sche atic diagra ww 5k* out lt1019-10 trim gnd lt1019 ?ta09 5.76k 1% 59k 1% 1.2k 15v cmos dac ref i out fb 30pf + v out lt1007 *low tc cermet, trim range = ?.5% negative 10v reference for cmos dac trim r29 80k r14 72k r4 q1 short for 2.5 q4 r5 r7 1.6k r8 2.5k r9 3k r36 82k r25 1k r37 2k 5k r39 r11b 1k r38 3.75k r11a 1.9k r26 3k r28 9k 1k r13 24.5k r27 9k r15 3k r34 4k r35 27k r16 3k r17 500 w r24 850 w q32 q29 q33 r20 750 w r33 1k r32 500 w r23 100 w r21 20 w v in v out r31 22k r19 15 w q24 c3 q22 q11 q12 gnd heater r40 400 w q3 q5 q6a q6b q18 c4 q19 q35 q14 q16 q15 q21 q23 q34 q25 q30 q31 q27 q20 r6 780 w q2 q36 q38 q37 q10 r42 4k r12 7.2k r18 2k q7 q13 q26 q28 q8 q9 r1 r2 r3 q17
10 lt1019 package descriptio u dimensions in inches (millimeters) unless otherwise noted. h package 8-lead to-5 metal can note: lead diameter is uncontrolled between the reference plane and seating plane. 0.050 (1.270) max 0.016 ?0.021 (0.406 ?0.533) 0.010 ?0.045 (0.254 ?1.143) seating plane 0.040 (1.016) max 0.165 ?0.185 (4.191 ?4.699) gauge plane reference plane 0.500 ?0.750 (12.700 ?19.050) 0.305 ?0.335 (7.747 ?8.509) 0.335 ?0.370 (8.509 ?9.398) dia 0.200 ?0.230 (5.080 ?5.842) bsc 0.027 ?0.045 (0.686 ?1.143) 0.027 ?0.034 (0.686 ?0.864) 0.110 ?0.160 (2.794 ?4.064) insulating standoff 45?yp h8(5) 0592 h8 package 8-lead plastic dip n8 0392 0.045 ?0.015 (1.143 ?0.381) 0.100 ?0.010 (2.540 ?0.254) 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 0.250 ?0.010 (6.350 ?0.254) 0.400 (10.160) max 0.009 ?0.015 (0.229 ?0.381) 0.300 ?0.320 (7.620 ?8.128) 0.325 +0.025 0.015 +0.635 0.381 8.255 ()
11 lt1019 package descriptio u dimensions in inches (millimeters) unless otherwise noted. s8 package 8-lead plastic soic 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) 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 0392 0.053 ?0.069 (1.346 ?1.752) 0.014 ?0.019 (0.355 ?0.483) 0.004 ?0.010 (0.101 ?0.254) 0.050 (1.270) bsc i nformation 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.
12 lt1019 linear technology corporation 1630 mccarthy blvd., milpitas, ca 95035-7487 (408) 432-1900 l fax : (408) 434-0507 l telex : 499-3977 ? linear technology corporation 1993 world headquarters linear technology corporation 1630 mccarthy blvd. milpitas, ca 95035-7487 phone: (408) 432-1900 fax: (408) 434-0507 u.s. area sales offices northeast region linear technology corporation one oxford valley 2300 e. lincoln hwy.,suite 306 langhorne, pa 19047 phone: (215) 757-8578 fax: (215) 757-5631 linear technology corporation 266 lowell st., suite b-8 wilmington, ma 01887 phone: (508) 658-3881 fax: (508) 658-2701 southwest region linear technology corporation 22141 ventura blvd. suite 206 woodland hills, ca 91364 phone: (818) 703-0835 fax: (818) 703-0517 northwest region linear technology corporation 782 sycamore dr. milpitas, ca 95035 phone: (408) 428-2050 fax: (408) 432-6331 southeast region linear technology corporation 17060 dallas parkway suite 208 dallas, tx 75248 phone: (214) 733-3071 fax: (214) 380-5138 central region linear technology corporation chesapeake square 229 mitchell court, suite a-25 addison, il 60101 phone: (708) 620-6910 fax: (708) 620-6977 international sales offices france linear technology s.a.r.l. immeuble "le quartz" 58 chemin de la justice 92290 chatenay malabry france phone: 33-1-41079555 fax: 33-1-46314613 germany linear technology gmbh untere hauptstr. 9 d-85386 eching germany phone: 49-89-3197410 fax: 49-89-3194821 japan linear technology kk 5f yz bldg. iidabashi, chiyoda-ku tokyo, 102 japan phone: 81-3-3237-7891 fax: 81-3-3237-8010 korea linear technology korea branch namsong building, #505 itaewon-dong 260-199 yongsan-ku, seoul korea phone: 82-2-792-1617 fax: 82-2-792-1619 singapore linear technology pte. ltd. 101 boon keng road #02-15 kallang ind. estates singapore 1233 phone: 65-293-5322 fax: 65-292-0398 taiwan linear technology corporation rm. 801, no. 46, sec. 2 chung shan n. rd. taipei, taiwan, r.o.c. phone: 886-2-521-7575 fax: 886-2-562-2285 united kingdom linear technology (uk) ltd. the coliseum, riverside way camberley, surrey gu15 3yl united kingdom phone: 44-276-677676 fax: 44-276-64851 lt/gp 0893 10k rev b ? printed in the usa 06/24/93

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