LM199/LM299/LM399 Precision Reference General Description The LM199 series 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 0.5Ω and allows the zener to operate over 0.5 mA to 10 mA 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 minimize 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 LM199 can be used in almost any application in place of ordinary zeners with improved performance. Some ideal applications are analog to digital converters, calibration standards, precision voltage or current sources or precision power supplies. Further in many cases the LM199 can replace references in existing equipment with a minimum of wiring changes. The LM199 series devices are packaged in a standard hermetic TO-46 package inside a thermal shield. The LM199 is rated for operation from −55˚C to +125˚C while the LM299 is rated for operation from −25˚C to +85˚C and the LM399 is rated from 0˚C to +70˚C. Features n n n n n n n n n Guaranteed 0.0001%/˚C temperature coefficient Low dynamic impedance — 0.5Ω Initial tolerance on breakdown voltage — 2% Sharp breakdown at 400 µA Wide operating current — 500 µA to 10 mA Wide supply range for temperature stabilizer Guaranteed low noise Low power for stabilization — 300 mW at 25˚C Proven reliability, low-stress packaging in TO-46 integrated-circuit hermetic package, for low hysteresis after thermal cycling. 33 million hours MTBF at TA = +25˚C (TJ = +86˚C) Connection Diagram Metal Can Package (TO-46) 00571714 Top View NS Package Number H04D Ordering Information Order Number Initial Tolerance Ambient Temperature LM199AH ± 2% ± 2% ± 2% ± 5% ± 5% LM199AH/883 LM299H LM399AH LM399H © 2005 National Semiconductor Corporation Package Marking Transport Method -50˚C to +125˚C LM199AH Box of 500 H04A -50˚C to +125˚C LM199AH/Q Tray of 20 H04A -25˚C to +85˚C LM299H Box of 500 H04A 0˚C to +70˚C LM399AH Box of 500 H04A 0˚C to +70˚C LM399H Box of 500 H04A DS005717 NSC Package www.national.com LM199/LM299/LM399 Precision Reference April 2005 LM199/LM299/LM399 Absolute Maximum Ratings (Note 1) Reference to Substrate Voltage V(RS) (Note 2) Specifications for Military/Aerospace products are not contained in this datasheet. Refer to the following Reliability Electrical Test Specifications documents: MNLM199A-X and SMD#5962-88561 . Operating Temperature Range −0.1V Temperature Stabilizer Voltage LM199 −55˚C to +125˚C LM299 −25˚C to +85˚C LM399 LM199/LM299/LM399 40V Reverse Breakdown Current 40V −0˚C to +70˚C Storage Temperature Range 20 mA −55˚C to +150˚C Soldering Information Forward Current TO-46 package (10 sec.) LM199/LM299/LM399 +300˚C 1 mA Electrical Characteristics (Notes 3, 6) Parameter Conditions Reverse Breakdown Voltage 0.5 mA ≤ IR ≤ 10 mA Reverse Breakdown Voltage 0.5 mA ≤ IR ≤ 10 mA LM299H LM399H Units Min Typ Max Min Typ Max 6.8 6.95 7.1 6.6 6.95 7.3 V 6 9 6 12 mV 0.5 1.5 Change with Current Reverse Dynamic Impedance IR = 1 mA Reverse Btreakdown Temperature Coefficient −25˚C≤TA≤85˚C LM299 0˚C≤TA≤+70˚C LM399 RMS Noise Long Term Stability 0.5 1 0.00003 0.0001 10 Hz ≤ f ≤ 10 kHz 7 20 Stabilized, 22˚C≤TA≤28˚C, 20 Ω %/˚C 0.00003 0.0002 7 50 20 %/˚C µV ppm 1000 Hours, IR=1 mA ± 0.1% Temperature Stabilizer TA=25˚C, Still Air, VS=30V 8.5 14 Supply Current TA =− 55˚C 22 28 Temperature Stabilizer 9 40 8.5 9 15 mA 40 V Supply Voltage Warm-Up Time to 0.05% VS = 30V, TA = 25˚C Initial Turn-on Current 9≤VS≤40, TA=+25˚C, (Note 4) 3 3 140 200 sec. 140 200 mA Electrical Characteristics (Notes 3, 6) Parameter Conditions Reverse Breakdown Voltage 0.5 mA ≤ IR ≤ 10 mA Reverse Breakdown Voltage 0.5 mA ≤ IR ≤ 10 mA LM199AH LM399AH Units Min Typ Max Min Typ Max 6.8 6.95 7.1 6.6 6.95 7.3 V 6 9 6 12 mV 0.5 1.5 Change with Current Reverse Dynamic Impedance IR = 1 mA Reverse Breakdown Temperature Coefficient −55˚C≤TA≤+85˚C +85˚C≤TA≤+125˚C 0˚C≤TA≤+70˚C LM199A 0.5 1 0.00002 0.00005 0.0005 0.0010 %/˚C LM399A RMS Noise 10 Hz ≤ f ≤ 10 kHz 7 Long Term Stability Stabilized, 22˚C≤TA≤28˚C, 20 Ω %/˚C 20 0.00003 0.0001 %/˚C 7 50 µV 20 ppm 1000 Hours, IR=1 mA ± 0.1% Temperature Stabilizer TA=25˚C, Still Air, VS=30V Supply Current TA =− 55˚C 8.5 22 Temperature Stabilizer 9 14 8.5 15 mA 40 V 28 40 9 Supply Voltage Warm-Up Time to 0.05% VS = 30V, TA = 25˚C Initial Turn-on Current 9≤VS≤40, TA=+25˚C, (Note 4) www.national.com 3 140 2 3 200 140 sec. 200 mA (Continued) Note 1: “Absolute Maximum Ratings” indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is functional, but do not guarantee specific performance limits. 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 −55˚C≤TA≤+125˚C for the LM199; −25˚C≤TA≤+85˚C for the LM299 and 0˚C≤TA≤+70˚C for the LM399. Note 4: This initial current can be reduced by adding an appropriate resistor and capacitor to the heater circuit. See the performance characteristic graphs to determine values. Note 5: Do not wash the LM199 with its polysulfone thermal shield in TCE. Note 6: A military data sheet is available for the LM199AH/833 and LM199AH-SMD (SMD#5962-88561) upon request. Functional Block Diagram LM199/LM299/LM399 00571715 3 www.national.com LM199/LM299/LM399 Electrical Characteristics (Notes 3, 6) LM199/LM299/LM399 Typical Performance Characteristics Reverse Characteristics Reverse Voltage Change 00571720 00571719 Dynamic Impedance Zener Noise Voltage 00571721 00571722 Stabilization Time Heater Current 00571724 00571723 www.national.com 4 (Continued) Initial Heater Current Heater Current (To Limit This Surge, See Next Graph) 00571725 00571726 Heater Surge Limit Resistor vs Minimum Supply Voltage at Various Minimum Temperatures Low Frequency Noise Voltage 00571703 00571727 *Heater must be bypassed with a 2 µF or larger tantalum capacitor if resistors are used. Response Time 00571707 5 www.national.com LM199/LM299/LM399 Typical Performance Characteristics LM199/LM299/LM399 Typical Applications Negative Heater Supply with Positive Reference Single Supply Operation 00571730 00571728 Buffered Reference With Single Sypply Split Supply Operation 00571731 00571729 Positive Current Source 00571732 www.national.com 6 LM199/LM299/LM399 Typical Applications (Continued) Standard Cell Replacement 00571733 Negative Current Source 00571734 Portable Calibrator* Square Wave Voltage Reference 00571735 00571736 *Warm-up time 10 seconds; intermittent operation does not degrade long term stability. 7 www.national.com LM199/LM299/LM399 Typical Applications (Continued) 14V Reference Precision Clamp* 00571737 00571738 *Clamp will sink 5 mA when input goes more positive than reference 0V to 20V Power Reference 00571739 Bipolar Output Reference 00571740 www.national.com 8 LM199/LM299/LM399 Schematic Diagrams Temperature Stabilizer 00571701 Reference 00571713 9 www.national.com LM199/LM299/LM399 Precision Reference Physical Dimensions inches (millimeters) unless otherwise noted NS Package H04D National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications. 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