Temperature-Stabilized Precision Reference 199A 299A 399A GENERAL DESCRIPTION The LM199A/LM299A/LM399A are precision, temperature- stabilized monolithic zeners offering temperature coefficients a factor of ten better than high quality reference zeners. Con- structed on a single monolithic chip is a temperature stabilizer circuit and an active reference zener. The active circuitry re- duces the dynamic impedance of the zener to about 0.522 and allows the zener to operate over 0.5mA to 10mA current range with essentially no change in voltage or temperature coefficient. Further, a new subsurface zener structure gives low noise and excelent 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 LM199A 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 LM199A is free of voltage shifts due to stress on the leads. Finally, since the unit is temperature stabilized, warm up time is fast. The LM199A can be used in almost any application in place of ordinary zeners with improved performance. Some ideal appli- cations are analog to digital converters, calibration standards, precision voltage or current sources or precision power supplies. SCHEMATIC DIAGRAMS Further in many cases the LM199A can replace references in existing equipment with a minimum of wiring changes. The LM199A series devices a TO-46 package inside a therma operation from -55C to +125 for operation from -25 gto ee from 0C to +70C. ~ kaged in a standard hermetic jeld. The LM199 is rated for While the LM299A is rated the LM399A is rated Reference FUNCTIONAL BLOCK DIAGRAM TT (TOQ-46) Metal Can P: (Top View) 4-13 199A 299A 399A Temperature-Stabilized Precision Reference ABSOLUTE MAXIMUM RATINGS Temperature Stabilizer Voltage . 2... ee ee ee eee 40v Reverse Breakdown Current .. 0.02. 2 eee ene Forward Current... 2.000 eee ce eee eens Reference to Substrate Voltage V(Rs) (Note 1) Operating Temperature Range LMIQ9A. ee tenet eens . 88C to +125C LM299A. 2 eee ee eee eee eee vee 28C to $85C LM399A. 0 eee teen ents . .... OC to +70C Storage Temperature Range... 0... cee eee eee eee : . .-55C to +150C Lead Temperature (Soldering, 10 seconds)... 0... 0.00000 e eee ee eee 300C ELECTRICAL CHARACTERISTICS LM399A PARAMETER CONDITIONS UNITS Tye MAX Reverse Breakdown Voltage | 0.56mA <IR <10mA 6,95 7.3 Vv Reverse Breakdown Voltage | 0.5mA <1 < 10mMA 6 12 mV Change With Current Reverse Dynamic Impedance | tg = 7mMA 0.5 1.6 Q Reverse Breakdown -58C <Ta <85C 0.00005 %/C Temperature Coefficient 85C <TaA <125C 0.0010 =25C < Tp < 85C 0.00005 oc <Ta <70C 0.00003 | 0.0001 RMS Noise 10 Hz << 10 kHz 7 20 7 50 uv Long Term Stability Stabilized, 22C 20 20 ppm Temperature Stabilizer Ta = 25C, Still Air, Vg = 30V. 8.5. 14 8.5 16 Supply Current Ta = -55@ oe 22 28 mA Temperature Stabilizer 9 40 9 40 Vv Supply Voltage (Note 3) Warm-Up Time to 0.05% 3 3 Seconds Initial Turn-on Current 140 200 140 200 mA NOTES: 1. The substrate is electrically tek 5 t! hppative terminal of the temperature stabilizer. The voltage that can be applied to either terminal of the reference is 40V more posit 01 V more negative than the substrate. 2. These specifications apply,sar 30Viapetied to the temperature stabilizer and -55C < Ta < +125C for the LM199A; -28C <Ta < +85C for the LM299A and 0C < 70C for tyeL M3994. 3. CAUTION. If the d. i ted for more than 60 seconds with heater supply voltage between 2V and QV the heater temperature control circuitry is not oro Ad the device can rise to approximately +150C. TYPICAL APPLICA For typical applications, see 199 data sheet beginning on page 4-7. ana Temperature-Stabilized Precision Reference 199A 299A 399A TYPICAL PERFORMANCE CHARACTERISTICS Reverse Characteristics Reverse Voltage Change Impedance 10 S 8 = = g ? = 5107 2 6 w z < STABIL 2 & S 5 (Tj = 90C) gs 2 193 3 a 4 a = 1 25 2 3 z 10 w 2 = STABILIZED sy 5 (7 ~ 90C) > 1o" ce 6 6.25 6.45 6.65 6.85 7.05 2 4 & 8 ne) Tk 10k 100k REVERSE VOLTAGE (V) REVERSE CURRENT ImAt QUENCY tH) Zener Noise Voltage Stabilization Time Heater Current 200 1 Ta= 2 z > 150 $ -l = w STABILIZEG 3 2 (Tj ~ 90C) 2 3 S 100 Pa . wy T+ 25C 2 q a = 50 -4 0 10 100 1k Wk = 100k 55-35 -15 5 25 45 69 85 105 FREQUENCY 'He} TEMPERATURE (C) Initial Heater Current Response Time - 250 Vine Ta 28C z 200 7 = 5 2 5S 150 Z 100 Vy > 10V g oS = 59 Vy > 20 = o 3 3 FE 100 S Vi = 30 $ 2 < Vy = 40V = = 3 z 30 > - INPUT Zz 0 66-36-15 5 25 45 Bi 2 4 6 8B 101214 16 18 0 100 200 300 400 TURN ON TEMPERATU TIME (SEC) TIME (11s) Low Frequency Noise Voltage = 8 > O.01Hz<fS1 Hz s STABILIZED w (Tj ~ 90C) 2 3 =z TIME (MINUTES) 4-15