Temperature-Stabi ized Precision Reference 199 299 399 GENERAL DESCRIPTION The LM199/LM399 are precision, temperature-stabilized monolithic zeners offering temperature coefficients a factor of ten better than high quality reference zeners. Constructed on a single monolithic chip is a temperature stabilizer circuit and an active reference zener. The active circuitry reduces the dynamic impedance of the zener to about 0.522 and allows the zener to operate over 0.5mMA to 10mA current range with essentially no change in voltage or temperature coefficient. Further, a new subsurface zener structure gives low noise and excellent long term stability compared to ordinary monolithic zeners. The package is supplied with a thermal shield to mini- mize heater power and improve temperature regulation. The LM199 series references are exceptionally easy to use and free of the problems that are often experienced with ordinary zeners. There is virtually no hysteresis in reference voltage with temperature cycling. Also, the LM199 is free of voltage shifts due to stress on the leads. Finally, since the unit is temperature stabilized, warm up time is fast. The M199 can be used in almost any application in place of ordinary zeners with improved performance. Some ideal applications are analog to digital converters, calibration stand- ards, precision voltage or current sources or precision power SCHEMATIC DIAGRAMS supplies. Further in many cases the LM199 can replace ref- erences in existing equipme changes. The LM199 series devices are TO-46 package inside ast for operation from -55 "Sto #4 for operation from . from 0C to +70C aes DESIGN FEATL L ance. FE iteakdown voltage 2% e e e eee e e e e. e with a minimum of wiring ged in a standard hermetic {. The LM199 is rated while the LM299 is rated to +85C and the LM399 is rated Reference FUNCTIONAL BLOCK DIAGRAM TT (TO-46) Metal Can Packa {Top View) * 47199 299 399 Temperature-Stabilized Precision Reference ABSOLUTE MAXIMUM RATINGS Temperature Stabilizer Voltage... ee eee et ee eee 40V Reverse Breakdown Current .......... Lee Le ge eee eee 20mA Forward Current. 20. ee ett eee _ ImA Reference to Substrate Voltage V(Rgs) (Note 1) : +40V -0.1V Operating Temperature Range LM199 eee ne teen e een ee 1. Phage -BBC to 4125C LM299 . 1. ee ee ee eee 4 : -25C to +85C LM399 ee eee ete Bac ae 0C to +70C Storage Temperature Range... 0... ce eee teens a .. : . -55C to +180C Lead Temperature (Soldering, 10 seconds). ......... 20.0000 ee eee eee eee 300C ELECTRICAL CHARACTERISTICS (Note 2) LM399 PARAMETER CONDITIONS UNITS MIN TYP MAX Reverse Breakdown Voltage | 0.5mA <IR <10mA 6.6 6.95 7.3 v Reverse Breakdown Voltage | 0.5mA<1<10mA 6 12 mV Change With Current Reverse Dynamic Impedance | IR = 1mA 0.5 1.6 Q Reverse Breakdown -65C <Tp <85C 0.0001 %/C Temperature Coefficient | 85C <Ta < 125C 0.0015 -25C<Ta <85C 9.0001 oc <TaA<70C 0.00003 | 0.0002 RMS Noise 10Hz<f<10kHz | 20 7 50 uv Long Term Stability Stabilized, 22C < 20 ppm 1000 Hours, IR = Temperature Stabilizer 14 8.5 15 mA Supply Current 28 Temperature Stabilizer 40 9 40 Vv Supply Voltage (Note 3) Warm-Up Time to 0.05% 3 Seconds tnitial Turn-on Current 200 140 200 mA NOTES: 1. The substrate is electrically comnge no t : ive terminal of the temperature stabilizer. The voltage that can be applied to either terminal of the reference is 40V more positite fo more fiegative than the substrate. 2. These specifications apply for 3 spol to the temperature stabilizer and 65C < Ta < +125C for the LM199; -25C < Ta < +85C for the LM299 and 0C < Ta, os c 6 ee 1399. 3. CAUTION. If the devicg. i Opened for re than 6O seconds with heater supply voltage between 2V and 9V the heater temperature control circuitry is not proper|; 1 jased i device can rise to approximately +150C Bie 43Temperature-Stabilized Precision Reference TYPICAL PERFORMANCE CHARACTERISTICS 199 299 399 Reverse Voitage Change 1 Reverse Charactaristics 19 S 8 & z w 7 5102 2 6 a 3 = 90 = Ss (Tj ~ 90C} > E10" <3 @ s 3 1) = 25C Z104 wo = STABILIZED S , 5 (Tj 90C) > 107 a (O 625 645 6.65 685 7.05 2 4 6& 8 REVERSE VOLTAGE (V) REVERSE CURRENT (mA) Zener Noise Voltage Stabilization Time 200 1 Ta = 25C = > TRE > A g 150 z z Ke ws STABILIZED = 2 (T; ~ 90C) -2 S 100 . 8 no Ti= 25C 3 50 4 10 100 = tk = 10k_~-100k FREQUENCY (Hz) Initial Heater Current = 250 ct Vue 5 200 b a S 150 = 3 = a 2 E100 a <= a = = 50 < E z a ~55-35-15 6 25 46 65 TURN ON TEMPERA Q TIME (SEC) Low Frequency Noise Voltage NOISE (5uV/DIV) 2 4 6 8 10 TIME (MINUTES} 294 6 8 10 121416 18 IMPEDANCE ({2) 10k (Hz) 100k 55-35-16 5 25 45 65 85 105 TEMPERATURE (C) Response Time CHV OHA ow VOLTAGE SWING {V} INPUT Oo 100 200 300 TIME (js) 400 0.01 Hz<t<1 Hz STABILIZED (Tj > 90C) 49199 299 399 Temperature-Stabilized Precision Reference TYPICAL APPLICATIONS Single Supply Operation sv TO 40V Rs TEMPERATURE st. Negative Heater Supply with Positive Reference +15V. TEMPERATURE STABILIZER g 75k 4 cas -9V TO Vv +15V TEMPERATURE STABILIZER Split Supply Operation +15V > 2 75k ? TEMPERATURE d STABILIZER soov av! Buffered Reference with Single Supply 75k 2 3 gk ~-- = 7 LM108A 10V 2N2219 OUTPUT 10 mA -32 T + Positive Current Source 10V TO 40V. 2350 > $0.1% TEMPERATURE STABILIZER re 6.95V Ae LMi99 > $4.3k > = Standard Cell Replacement 15V TO 20V: $7.5k TEMPERATURE a STABILIZER g 12k $0.1% ik sav pe 22k I Zo1% 4-10Temperature-Stabilized Precision Reference 199 299 399 TYPICAL APPLICATIONS (Cont.) Negative Current Source 28V 14V Reference = 275k TEMPERATURE 5 CURRENT ouTPUT STABILIZER ADJUST |, 10-20mA 3 re Ne y 20k 8 2N2905 save Lwa12 2N4193 2 LM199 4 e 20k 3 > 3 300 -25V Portable Calibrator* Square Wave Voltage Reference 1. 88k +15V a 15k 50k Oa | WwW Ww | f--outeur 200k 3 2S], | 2N4193 vy toe tun 180k lav 3}, Ly NA 4 cosv 1 1 5k 1N457 AAA L199 ( | TEMPERATURE S 19k STABILIZER y 1% t | = 0 TO ~10V 6.95V INPUT S TEER SQUARE WAVE { w199 RS | TRIM OUTPUT 10V Warm-up time 10 seconds; intermittant operation does not degrade long term stability. i Precision Clamp* ia cLAMP ak OUTPUT : ours INPUT TEMPERATURE R oT STABILIZER sosv 1N914 L199 uy 18k 2 TEMPERATURE : , = STABILIZER TEMPERATURE 4 LL STABILIZER] sosv feel LM199 cove LM199 1Ng14 = *Ciamp will sink SmA when input goes more positive than reference. OUTPUT 4-11199 299 399 TYPICAL APPLICATIONS (Cont.) Temperature-Stabilized Precision Reference OV to 20V Power Reference 25V TO 40V e 6k : TEMPERATURE STABILIZER MIg5K ~ \ 5k 2k aa " * 20K3 WA 6.95V 4 | IF 38k ov TO 20V Lwiges MYLAR . Ww OATOIA 2 20k 10NpF ik > TL > -5V Bipolar Output Reference 50k +15V WA . 375k +15V TEMPERATURE Aok d2 STABILIZER oe aay ; b OUTPUT +6.9V 50k Yj > 10 TURN vk OUTPUT iM19g ADJUST _15y 300F ~15V J + 4-12