LM199_05

LM199/LM299/LM399 Precision Reference April 2005 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 LM199AH LM199AH/883 LM299H LM399AH LM399H Initial Tolerance Ambient Temperature -50˚C to +125˚C -50˚C to +125˚C -25˚C to +85˚C 0˚C to +70˚C 0˚C to +70˚C Package Marking LM199AH LM199AH/Q LM299H LM399AH LM399H Transport Method Box of 500 Tray of 20 Box of 500 Box of 500 Box of 500 NSC Package H04A H04A H04A H04A H04A ± 2% ± 2% ± 2% ± 5% ± 5% © 2005 National Semiconductor Corporation DS005717 www.national.com LM199/LM299/LM399 Absolute Maximum Ratings (Note 1) 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 . Temperature Stabilizer Voltage LM199/LM299/LM399 Reverse Breakdown Current Forward Current LM199/LM299/LM399 1 mA 40V 20 mA Reference to Substrate Voltage V(RS) (Note 2) Operating Temperature Range LM199 LM299 LM399 Storage Temperature Range Soldering Information TO-46 package (10 sec.) 40V −0.1V −55˚C to +125˚C −25˚C to +85˚C −0˚C to +70˚C −55˚C to +150˚C +300˚C Electrical Characteristics (Notes 3, 6) Parameter Reverse Breakdown Voltage Reverse Breakdown Voltage Change with Current Reverse Dynamic Impedance Reverse Btreakdown Temperature Coefficient RMS Noise Long Term Stability Temperature Stabilizer Supply Current Temperature Stabilizer Supply Voltage Warm-Up Time to 0.05% Initial Turn-on Current VS = 30V, TA = 25˚C 9≤VS≤40, TA=+25˚C, (Note 4) 3 140 200 3 140 200 sec. mA IR = 1 mA −25˚C≤TA≤85˚C 0˚C≤TA≤+70˚C 10 Hz ≤ f ≤ 10 kHz Stabilized, 22˚C≤TA≤28˚C, 1000 Hours, IR=1 mA ± 0.1% TA=25˚C, Still Air, VS=30V TA =− 55˚C 9 8.5 22 14 28 40 9 40 V 8.5 15 mA LM299 LM399 7 20 20 0.5 0.00003 1 0.0001 0.00003 7 20 0.0002 50 0.5 1.5 Ω %/˚C %/˚C µV ppm Conditions Min 0.5 mA ≤ IR ≤ 10 mA 0.5 mA ≤ IR ≤ 10 mA 6.8 LM299H Typ 6.95 6 Max 7.1 9 Min 6.6 LM399H Typ 6.95 6 Max 7.3 12 V mV Units Electrical Characteristics (Notes 3, 6) Parameter Reverse Breakdown Voltage Reverse Breakdown Voltage Change with Current Reverse Dynamic Impedance Reverse Breakdown Temperature Coefficient RMS Noise Long Term Stability Temperature Stabilizer Supply Current Temperature Stabilizer Supply Voltage Warm-Up Time to 0.05% Initial Turn-on Current VS = 30V, TA = 25˚C 9≤VS≤40, TA=+25˚C, (Note 4) 3 140 200 3 140 200 sec. mA IR = 1 mA −55˚C≤TA≤+85˚C +85˚C≤TA≤+125˚C 0˚C≤TA≤+70˚C 10 Hz ≤ f ≤ 10 kHz Stabilized, 22˚C≤TA≤28˚C, 1000 Hours, IR=1 mA ± 0.1% TA=25˚C, Still Air, VS=30V TA =− 55˚C 9 8.5 22 14 28 40 9 40 V 8.5 15 mA LM199A LM399A 7 20 20 0.5 0.00002 0.0005 1 0.00005 0.0010 0.00003 7 20 0.0001 50 0.5 1.5 Ω %/˚C %/˚C %/˚C µV ppm Conditions Min 0.5 mA ≤ IR ≤ 10 mA 0.5 mA ≤ IR ≤ 10 mA 6.8 LM199AH Typ 6.95 6 Max 7.1 9 Min 6.6 LM399AH Typ 6.95 6 Max 7.3 12 V mV Units www.national.com 2 LM199/LM299/LM399 Electrical Characteristics (Notes 3, 6) (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 Typical Performance Characteristics Reverse Characteristics Reverse Voltage Change 00571720 00571719 Dynamic Impedance Zener Noise Voltage 00571721 00571722 Stabilization Time Heater Current 00571723 00571724 www.national.com 4 LM199/LM299/LM399 Typical Performance Characteristics Initial Heater Current (Continued) 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 Applications Single Supply Operation Negative Heater Supply with Positive Reference 00571730 00571728 Split Supply Operation Buffered Reference With Single Sypply 00571729 00571731 Positive Current Source 00571732 www.national.com 6 LM199/LM299/LM399 Typical Applications (Continued) Standard Cell Replacement 00571733 Negative Current Source 00571734 Square Wave Voltage Reference Portable Calibrator* 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) Precision Clamp* 14V Reference 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 unless otherwise noted inches (millimeters) 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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