LM199/LM399 LM199A/LM399A Precision Reference U FEATURES DESCRIPTIO ■ The LM199/LM399 precision shunt reference features excellent temperature stability over a wide range of voltage, 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 0.5mA to 10mA, and offers minimal noise and excellent long-term stability. ■ ■ ■ ■ ■ ■ 6.95V Shunt Reference Guaranteed 0.5ppm/°C Temperature Coefficient Guaranteed 1Ω Maximum Dynamic Impedance Guaranteed 20µVRMS Maximum Noise Guaranteed Initial Tolerance of 2% Wide Operating Current Range Available in 4-Lead TO-46 Metal Can U APPLICATIO S ■ ■ ■ ■ Ideal applications for the LM199/LM399 include digital voltmeters, precision calibration equipment, current sources and a variety of other precision low cost references. A 10V buffered reference application is shown below. Precision Voltage Reference for Multimeters Calibration Equipment Voltage Standards Laboratory Measurement Equipment Industrial Monitor/Control Instruments High Accuracy Data Converters , LTC and LT are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. U ■ TYPICAL APPLICATIO 10V Buffered Reference Reverse Voltage Change 15V + 1 3 8 9k 0.1% 2 LM399H – 7 LT®1001 6.95V 3 6 + 4 20k 0.1% – 4 2 LM199 TA01a 10V REVERSE VOLTAGE CHANGE (mV) 7.5k 5% 7 6 5 STABILIZED (TJ ≈ 90°C) 4 TJ = 25°C 3 2 1 0 0 2 4 8 6 REVERSE CURRENT (mA) 10 LM199 TA01b LM199399fb 1 LM199/LM399 LM199A/LM399A U W W W ABSOLUTE AXI U RATI GS U W U PACKAGE/ORDER I FOR ATIO (Note 1) Temperature Stabilizer ..............................................40V Reverse Breakdown Current...................................20mA Forward Current .......................................................1mA Reference to Substrate Voltage, VRS (Note 2) ........–0.1V Operating Temperature Range LM199/LM199A (OBSOLETE) ............ –55°C to 125°C LM399/LM399A ....................................... 0°C to 70°C Storage Temperature Range LM199/LM199A (OBSOLETE) ............ –65°C to 150°C LM399/LM399A ................................. –65°C to 150°C Lead Temperature (Soldering, 10 sec) .................. 300°C TOP VIEW + 1 4 – 3 + H – 2 H PACKAGE 4-LEAD TO-46 METAL CAN INSIDE THERMAL SHIELD ORDER PART NUMBER LM399H LM399AH LM199H LM199AH LM199AH-20 LM399AH-20 LM399AH-50 OBSOLETE Order Options Tape and Reel: Add #TR Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF Lead Free Part Marking: http://www.linear.com/leadfree/ Consult LTC Marketing for parts specified with wider operating temperature ranges. ELECTRICAL CHARACTERISTICS The ● denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. (Note 3) SYMBOL PARAMETER CONDITIONS VZ Reverse Breakdown Voltage 0.5mA ≤ IR ≤ 10mA ● ΔVZ Reverse Breakdown Voltage Change with Current 0.5mA ≤ IR ≤ 10mA ● rZ Reverse Dynamic Impedance ΔVZ ΔTemp Temperature Coefficient LM199/LM399 LM199A/LM399A LM399/LM399A MIN TYP MAX 6.8 6.75 6.95 7.1 6 IR = 1mA (Note 6) (10Hz ≤ f ≤ 100Hz) ● UNITS 6.95 7.3 V 9 6 12 mV 0.5 1 0.5 1.5 Ω –55°C ≤ TA ≤ 85°C 85°C ≤ TA ≤ 125°C 0°C ≤ TA ≤ 70°C 0.3 5 1 15 –55°C ≤ TA ≤ 85°C 85°C ≤ TA ≤ 125°C 0°C ≤ TA ≤ 70°C 0.2 5 en RMS Noise 10Hz ≤ f ≤ 10kHz ΔVZ ΔTime IH Long-Term Stability Stabilized, 22°C ≤ TA ≤ 28°C, 1000 Hours, IR = 1mA ±0.1% VH LM199/LM199A MIN TYP MAX 0.3 Temperature Stabilizer Supply Current TA = 25°C, Still Air, VH = 30V TA = –55°C (Note 5) ● Temperature Stabilizer Supply Voltage Warm-Up Time to ±0.05% VZ VH = 30V Initial Turn-On Current 9V ≤ VH ≤ 40V (Note 5) 7 20 7 8 (Note 4) 8 8.5 22 14 28 8.5 9 40 3 140 1 ppm/°C ppm/°C ppm/°C 50 µV 0.5 10 0.3 ● 2 ppm/°C ppm/°C ppm/°C 9 (Note 4) ppm/√kH 15 40 3 200 140 mA V Seconds 200 mA LM199399fb 2 LM199/LM399 LM199A/LM399A ELECTRICAL CHARACTERISTICS 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.” Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. 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; and 0°C ≤ TA ≤ 70°C for the LM399. U W TYPICAL PERFOR A CE CHARACTERISTICS Reverse Characteristics Dynamic Impedance 10 1 TJ = 25°C 0.1 STABILIZED (TJ ≈ 90°C) 0.01 6.25 1 10 STABILIZED (TJ ≈ 90°C) 1 7.05 10 –2 100 1k 10k FREQUENCY (Hz) –4 100k 4 12 16 8 HEATER ON TIME (SECONDS) 0 LM199 G02 Initial Heater Current Heater Current 160 80 VH = 40V 20 LM199 G03 Heater Current TA = 25°C 140 200 150 100 50 60 HEATER CURRENT (mA) HEATER CURRENT (mA) INITIAL HEATER CURRENT (mA) TA = –55°C –1 –3 LM199 G01 250 TA = 25°C TJ = 25°C 0.1 6.85 6.45 6.65 REVERSE VOLTAGE (V) VH = 15V 0 OUTPUT (mV) DYNAMIC IMPEDANCE (Ω) REVERSE CURRENT (mA) Stabilization Time 100 100 VH = 10V 40 VH = 20V VH = 30V 20 LM199 G04 0 25 45 65 –55 –35 –15 5 TEMPERATURE (°C) 100 80 VH = 10V 60 VH = 20V VH = 30V 40 20 VH = 40V 0 –55 –35 –15 5 25 45 65 85 105 125 TURN ON TEMPERATURE (°C) 120 VH = 40V 0 85 105 LM199 G05 0 2 4 6 8 10 12 14 16 18 TIME (SECONDS) LM199 G06 LM199399fb 3 LM199/LM399 LM199A/LM399A U W TYPICAL PERFOR A CE CHARACTERISTICS Response Time 8 OUTPUT 7 150 STABILIZED (TJ ≈ 90°C) 100 5 VOLTAGE SWING (V) NOISE (nV/√Hz) 6 4 Limiting Surge Current STABILIZED (TJ ≈ 90°C) MAXIMUM SURGE LIMITING RESISTOR (Ω) Zener Noise Voltage 200 TJ = 25°C 3 7.5k 2 1 INPUT 0 OUTPUT 20 TJ = 25°C INPUT 10 0 50 10 100 1k 10k FREQUENCY (Hz) 100k 0 100 200 TIME (µs) 300 LM199 G07 400 LM199 G08 800 700 600 500 25°C (46mA) 5°C (60mA) –15°C (71mA) –35°C (87mA) –55°C (105mA) 400 300 200 100 0 0 20 10 30 MINIMUM SUPPLY VOLTAGE (V) 40 HEATER MUST BE BYPASSED WITH A 2µF OR LARGER TANTALUM CAPACITOR IF RESISTORS ARE USED LM199 G09 Long-Term Reference Performance, 44 Units Tested Low Frequency Noise Voltage 12 8 NOISE(10µV/DIV) DRIFT (ppm) 10 3 SIGMA 6 4 MEAN 2 0 2 4 6 8 MONTHS 10 12 LM199 G10 0 50 150 100 TIME (SECONDS) 200 250 LM199 G11 LM199399fb 4 LM199/LM399 LM199A/LM399A W U U FU CTIO AL BLOCK DIAGRA 3 1 + + H – – 4 2 LT199 FD U TYPICAL APPLICATIO S Single Supply Operation Split Supply Operation 9V TO 40V Negative Heater Supply with Positive Reference 15V 15V RS 7.5k + 7.5k + + LM399 LM399 LM399 6.95V 6.95V 6.95V – – – LM199 TA02 –9V TO –33V –15V LM199 TA04 LM199 TA03 Standard Cell Replacement 15V TO 20V 1% REGULATED 1µF 7.5k + – 1 3 4 OUTPUT ADJUST LM199A 12k 0.1% 6.95V 20k 22k 2 – 2k 3 + 100k 2M 2 2k 0.1% 7 LT1001AC 6 OUTPUT 4 1µF LM199 TA05 LM199399fb 5 LM199/LM399 LM199A/LM399A U TYPICAL APPLICATIO S Portable Calibrator 8.8k 1% 2 200k + 12V TO 18V – 7 LT1001AC 3 + 6 OUTPUT 10V 4 5k + 19k 1% LM399 6.95V 3k TRIM – LM199 TA06 W W SCHE ATIC DIAGRA S Temperature Stabilizer Reference 3 1 Q9 Q5 Q2 + 1k Q3 6.3V 50Ω Q10 + Q15 Q8 Q6 Q1 Q14 2k Q12 15pF Q7 10pF 30pF 2k Q16 Q13 10k 11.2k 2k D1 6.3V Q3 Q4 4.2Ω D2 6.3V 2k Q11 2.6k 30k 1k 4 LM199 SD01 – 2 – LM199 SD02 LM199399fb 6 LM199/LM399 LM199A/LM399A U PACKAGE DESCRIPTIO H Package 4-Lead TO-46 Metal Can Thermal Shield* for TO-46, H Package (Reference LTC DWG # 05-08-1341) .209 – .219 (5.309 – 5.563) .178 – .195 (4.521 – 4.953) REFERENCE PLANE .085 – .105 (2.159 – 2.667) .500 (12.700) MIN .025 (0.635) MAX SEATING* PLANE .016 – .019** (0.406 – 0.483) DIA .050 (1.270) TYP .100 (2.540) TYP .399 – .409 (10.135 – 10.389) DIA .244 – .234 (5.690 – 5.943) SEATING PLANE .400 (10.160) .016 – .019 (0.406 – 0.483) TYP DIA .100 (2.540) .050 (1.270) .050 (1.270) TYP * THERMAL SHIELD MATERIAL IS VALOXTM. VALOX IS A TRADEMARK OF GENERAL ELECTRIC PIN 1 45° .036 – .046 (0.914 – 1.168) .028 – .048 (0.711 – 1.219) H4(TO-46) 0801 *LEAD DIAMETER IS UNCONTROLLED BETWEEN THE REFERENCE PLANE AND .050" BELOW THE REFERENCE PLANE .016 – .024 **FOR SOLDER DIP LEAD FINISH, LEAD DIAMETER IS (0.406 – 0.610) LM199399fb 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 representation that the interconnection of its circuits as described herein will not infringe on existing patent rights. 7 LM199/LM399 LM199A/LM399A RELATED PARTS PART NUMBER DESCRIPTION COMMENTS LT1021 Precision References for Series or Shunt Operation Industry Standard Pinout, –40°C to 125°C 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, 10µA Current LTZ1000 7V Ultra Precision, Stable Shunt Reference 0.05ppm/°C, 1.2mVP-P Noise LM199399fb 8 Linear Technology Corporation LT 1005 REV B • PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com © LINEAR TECHNOLOGY CORPORATION 1987