1 for more information www.linear.com/lm399 typical a pplica t ion fea t ures descrip t ion precision reference the lm199/lm399 precision shunt reference features excellent temperature stability over a wide range of volt- age, temperature and operating current conditions. a stabilizing heater is incorporated with the active zener on a monolithic substrate which nearly eliminates changes in voltage with temperature. the subsurface zener operates over a current range of 0.5 ma to 10 ma, and offers minimal noise and excellent long-term stability. ideal applications for the lm199/lm399 include digital volt - meters, precision calibration equipment, current sources and a variety of other precision low cost references. a 10v buffered reference application is shown below. 10v buffered reference reverse voltage change a pplica t ions l, lt , lt c , lt m , linear technology and the linear logo are registered trademarks of linear technology corporation. all other trademarks are the property of their respective owners. n precision voltage reference for multimeters n calibration equipment voltage standards n laboratory measurement equipment n industrial monitor/control instruments n high accuracy data converters n 6.95v shunt reference n guaranteed 0.5ppm/c temperature coeffcient n guaranteed 1 maximum dynamic impedance n guaranteed 20v rms maximum noise n guaranteed initial tolerance of 2% n wide operating current range n available in 4-lead to-46 metal can 9k 0.1% 7.5k 5% 3 + ? 1 4 2 6.95v 15v lm399h 20k 0.1% 2 7 4 6 10v 3 lm199 ta01a ? + lt ? 1001 reverse current (ma) 0 reverse voltage change (mv) 3 4 5 6 10 lm199 ta01b 2 1 0 2 4 8 6 7 8 stabilized (t j 90c) t j = 25c lm199/lm399 lm199a/lm399a 199399fc
2 for more information www.linear.com/lm399 p in c on f igura t ion a bsolu t e maxi m u m r a t ings top view + 1 h package 4-lead to-46 metal can inside thermal shield ? 4 2 ? 3 + h o r d er i n f or m a t ion lead free finish tape and reel part marking package description temperature range lm399h lm399h#trpbf lm399h 4-lead to-46 metal can 0c to 70c lm399ah lm399ah#trpbf lm399ah 4-lead to-46 metal can 0c to 70c obsolete package lm199h lm199h#trpbf 4-lead to-46 metal can C55c to 125c lm199ah lm199ah#trpbf 4-lead to-46 metal can C55c to 125c lm199ah-20 lm199ah-20#trpbf 4-lead to-46 metal can C55c to 125c lm399ah-20 lm399ah-20#trpbf 4-lead to-46 metal can 0c to 70c lm399ah-50 lm399ah-50#trpbf 4-lead to-46 metal can 0c to 70c consult lt c marketing for parts specified with wider operating temperature ranges. consult lt c marketing for information on nonstandard lead based finish parts. for more information on lead free part marking, go to: http://www.linear.com/leadfree/ for more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/ lm199/lm199a lm399/lm399a symbol parameter conditions min typ max min typ max units v z reverse breakdown voltage 0.5ma i r 10ma l 6.8 6.95 7.1 6.75 6.95 7.3 v v z reverse breakdown voltage change with current 0.5ma i r 10ma l 6 9 6 12 mv r z reverse dynamic impedance i r = 1ma (note 6) (10hz f 100hz) l 0.5 1 0.5 1.5 v z temp temperature coefficient lm199/lm399 C55c t a 85c 85c t a 125c 0c t a 70c 0.3 5 1 15 0.3 2 ppm/c ppm/c ppm/c lm199a/lm399a C55c t a 85c 85c t a 125c 0c t a 70c 0.2 5 0.5 10 0.3 1 ppm/c ppm/c ppm/c e n rms noise 10hz f 10khz l 7 20 7 50 v elec t rical c harac t eris t ics temperature stabilizer .............................................. 40 v revers e breakdown current ................................... 20 ma forw ard current ....................................................... 1 ma refer ence to substrate voltage , v rs ( note 2) ........ C 0.1 v o perating temperature range lm 199/ lm 199 a ( obsolete ) ............ C55 c to 125 c lm 399/ lm 399a ...................................... 0 c to 70 c storage temperature range lm 199/ lm 199 a ( obsolete ) ............ C65 c to 150 c lm 399/ lm 399a ................................ C65 c to 150 c lead temperature ( soldering , 10 sec ) ................... 300 c (note 1) the l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at t a = 25c. (note 3) lm199/lm399 lm199a/lm399a 199399fc
3 for more information www.linear.com/lm399 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: the substrate is electrically connected to the negative terminal of the temperature stabilizer. the voltage that can be applied to either terminal of the reference is 40v more positive or 0.1v more negative than the substrate. note 3: these specifications apply for 30v applied to the temperature stabilizer and C55c t a 125c for the lm199; and 0c t a 70c for the lm399. note 4: devices with maximum guaranteed long-term stability of 20ppm/kh are available. drift decreases with time. note 5: this initial current can be reduced by adding an appropriate resistor and capacitor to the heater circuit. see the typical performance characteristics graphs to determine values. note 6: guaranteed by reverse breakdown change with current. elec t rical c harac t eris t ics typical p er f or m ance c harac t eris t ics lm199/lm199a lm399/lm399a symbol parameter conditions min typ max min typ max units v z time long-term stability stabilized, 22c t a 28c, 1000 hours, i r = 1ma 0.1% 8 (note 4) 8 (note 4) ppm/ kh i h temperature stabilizer supply current t a = 25c, still air, v h = 30v t a = C55c (note 5) 8.5 22 14 28 8.5 15 ma v h temperature stabilizer supply voltage l 9 40 9 40 v warm-up time to 0.05% v z v h = 30v 3 3 seconds initial turn-on current 9v v h 40v (note 5) 140 200 140 200 ma the l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at t a = 25c. (note 3) reverse characteristics dynamic impedance stabilization time reverse voltage (v) 6.25 0.01 reverse current (ma) 0.1 1 10 100 6.45 6.65 lm199 g01 6.85 7.05 t j = 25c stabilized (t j 90c) frequency (hz) 10 0.1 dynamic impedance ( ) 10 100 100 1k 10k 100k lm199 g02 1 t j = 25c stabilized (t j 90c) heater on time (seconds) 0 output (mv) ?1 0 1 16 lm199 g03 ?2 ?3 ?4 4 8 12 20 t a = 25c v h = 15v t a = ?55c lm199/lm399 lm199a/lm399a 199399fc
4 for more information www.linear.com/lm399 typical p er f or m ance c harac t eris t ics zener noise voltage response time limiting surge current frequency (hz) 10 50 100 150 200 100 1k 10k 100k lm199 g07 noise (nv/hz) t j = 25c stabilized (t j 90c) time (s) 0 voltage swing (v) 2 4 6 8 400 lm199 g08 0 10 1 3 5 7 20 0 100 200 300 t j = 25c output input stabilized (t j 90c) input output 7.5k minimum supply voltage (v) 0 maximum surge limiting resistor ( ) 400 600 40 lm199 g09 200 0 10 20 30 800 25c (46ma) 5c (60ma) ?15c (71ma) ?35c (87ma) ?55c (105ma) 300 500 100 700 heater must be bypassed with a 2f or larger tantalum capacitor if resistors are used long-term reference performance, 44 units tested low frequency noise voltage months 2 0 drift (ppm) 2 4 6 8 10 12 4 6 8 10 lm199 g10 12 3 sigma mean time (seconds) 0 noise(10v/div) 200 lm199 g11 50 100 150 250 initial heater current heater current heater current turn on temperature (c) ?55 0 initial heater current (ma) 50 150 200 250 ?15 25 45 125 lm199 g04 100 ?35 5 65 85 105 v h = 40v temperature (c) ?55 heater current (ma) 40 60 105 lm199 g05 20 0 ?15 25 65 ?35 5 45 85 80 v h = 10v v h = 20v v h = 40v v h = 30v time (seconds) 0 heater current (ma) 160 140 120 100 80 60 40 20 0 16 lm199 g06 4 8 12 14 2 6 10 18 v h = 10v v h = 20v t a = 25c v h = 30v v h = 40v lm199/lm399 lm199a/lm399a 199399fc
5 for more information www.linear.com/lm399 func t ional b lock diagra m typical a pplica t ions 2 4 1 3 h + ? + ? lt199 fd single supply operation r s + ? 6.95v lm199 ta02 9v to 40v lm399 split supply operation 7.5k + ? 6.95v lm199 ta03 15v ?15v lm399 negative heater supply with positive reference 7.5k + ? 6.95v lm199 ta04 15v ?9v to ?33v lm399 standard cell replacement 7.5k 2m output 1f 1f 2k 2 3 7 4 6 20k 22k 12k 0.1% output adjust 2k 0.1% 3 + ? 1 4 2 6.95v 15v to 20v 1% regulated lm199a lm199 ta05 ? + lt1001ac 100k lm199/lm399 lm199a/lm399a 199399fc
6 for more information www.linear.com/lm399 typical a pplica t ions s che m a t ic diagra m s portable calibrator 200k output 10v 8.8k 1% 2 3 4 7 6 5k 3k trim 19k 1% + ? 6.95v 12v to 18v lm199 ta06 lm399 + ? + lt1001ac temperature stabilizer q5 11.2k 2k d1 6.3v d2 6.3v 1k 4.2 q6 q2 q1 q9 q8 + ? q7 q4 lm199 sd01 2k 10pf q3 3 4 reference q3 6.3v 50 30k 2k 2.6k q10 q11 q13 q14 q15 15pf 2k 10k q12 q16 1k + ? lm199 sd02 1 2 30pf lm199/lm399 lm199a/lm399a 199399fc
7 for more information www.linear.com/lm399 r evision h is t ory rev date description page number c 12/14 package/order information updated thermal shield dimensions corrected 2 7 (revision history begins at rev c) 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. p ackage descrip t ion please refer to http://www .linear.com/designtools/packaging/ for the most recent package drawings. .400 ? .420 (10.160 ? 10.668) dia .016 ? .019 (0.406 ? 0.483) typ dia .100 (2.540) .225 ? .240 (5.715 ? 6.096) .450 (11.430) .050 (1.270) seating plane ref .016 ? .019** (0.406 ? 0.483) dia .025 (0.635) max reference plane .085 ? .105 (2.159 ? 2.667) .500 (12.700) min .178 ? .195 (4.521 ? 4.953) .209 ? .219 (5.309 ? 5.563) .100 (2.540) typ 45 h4(to-46) 0801 .050 (1.270) typ .050 (1.270) typ .028 ? .048 (0.711 ? 1.219) .036 ? .046 (0.914 ? 1.168) seating* plane lead diameter is uncontrolled between the reference plane and .050" below the reference plane for solder dip lead finish, lead diameter is .016 ? .024 (0.406 ? 0.610) * ** pin 1 h package 4-lead to-46 metal can (reference lt c dwg # 05-08-1341) thermal shield* for to-46, h package *thermal shield material is valox lm199/lm399 lm199a/lm399a 199399fc
8 for more information www.linear.com/lm399 ? linear technology corporation 1987 lt 1214 rev c ? printed in usa linear technology corporation 1630 mccarthy blvd., milpitas, ca 95035-7417 (408) 432-1900 fax : (408) 434-0507 www.linear.com/lm399 r ela t e d p ar t s part number description comments lt ? 1021 precision references for series or shunt operation industry standard pinout, C40c to 125c lt1389 1.25v, 2.5v, 4v and 5v nanopower shunt reference 800na, 0.05% accuracy, 10ppm/c drift lt1634 1.25 and 2.5v micropower shunt reference 0.05%, 10ppm/c, 10a current lt z 1000 7v ultra precision, stable shunt reference 0.05ppm/c, 1.2mv p-p noise lm199/lm399 lm199a/lm399a 199399fc
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