LT1021 Precision Reference FEATURES DESCRIPTIO Ultralow Drift: 5ppm/C Max Slope The LT 1021 is a precision reference with ultralow drift Very Low Noise: <1ppm (0.1Hz to 10Hz) and noise, extremely good long term stability and almost P-P 100% Noise Tested total immunity to input voltage variations. The reference Pin Compatible with Most Bandgap Reference output will both source and sink up to 10mA. Three Applications, Including Ref 01, Ref 02, LM368, voltages are available: 5V, 7V and 10V. The 7V and 10V MC1400 and MC1404 with Greatly Improved units can be used as shunt regulators (two-terminal zeners) Stability, Noise and Drift with the same precision characteristics as the three- Trimmed Output Voltage terminal connection. Special care has been taken to mini- Operates in Series or Shunt Mode mize thermal regulation effects and temperature Output Sinks and Sources in Series Mode induced hysteresis. >100dB Ripple Rejection The LT1021 references are based on a buried zener diode Minimum Input/Output Differential of 1V structure that eliminates noise and stability problems Available in 5-Lead Can, N8 and S8 Packages associated with surface breakdown devices. Further, a subsurface zener exhibits better temperature drift and U time stability than even the best bandgap references. APPLICATIO S Unique circuit design makes the LT1021 the first IC A/D and D/A Converters reference to offer ultralow drift without the use of high Precision Regulators power on-chip heaters. Digital Voltmeters Inertial Navigation Systems The LT1021-7 uses no resistive divider to set output Precision Scales voltage, and therefore exhibits the best long term stability Portable Reference Standard and temperature hysteresis. The LT1021-5 and LT1021- 10 are intended for systems requiring a precise 5V or 10V reference with an initial tolerance as low as 0.05%. , LTC and LT are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. TYPICAL APPLICATIO Typical Distribution of Temperature Drift 24 Basic Positive and Negative Connections DISTRIBUTION OF THREE RUNS 21 LT1021 LT1021 18 (7 AND 10 ONLY) 15 V IN OUT V NC IN OUT IN OUT GND GND 12 V OUT 9 V (V ) OUT R1 = 6 R1 I + 1.5mA LOAD 3 15V (V ) 1021 TA01 0 5 4 3 2 1 0 1 2 3 4 5 OUTPUT DRIFT (ppm/C) 1021 TA01 1021fc 1 UNITS (%) U ULT1021 ABSOLUTEXAI U RATI GS (Note 1) Input Voltage .......................................................... 40V Output Short-Circuit Duration Input/Output Voltage Differential ............................ 35V V = 35V ......................................................... 10 sec IN Output-to-Ground Voltage (Shunt Mode Current Limit) V 20V ................................................... Indefinite IN LT1021-5............................................................. 10V Operating Temperature Range LT1021-7............................................................. 10V Commercial ............................................ 0C to 70C LT1021-10........................................................... 16V Industrial ........................................... 40C to 85C Trim Pin-to-Ground Voltage Military ............................................ 55C to 125C Positive ............................................... Equal to V Storage Temperature Range ................ 65C to 150C OUT Negative ........................................................... 20V Lead Temperature (Soldering, 10 sec)................ 300C PACKAGE/ORDER I FOR ATIO TOP VIEW TOP VIEW NC* 8 DNC* 1 8 DNC* 1 NC* NC* 7 V 2 DNC* 7 IN V 2 6 V DNC* 3 6 V IN 0UT OUT GND TRIM** 4 5 3 5 TRIM** NC* 4 N8 PACKAGE S8 PACKAGE GND 8-LEAD PDIP 8-LEAD PLASTIC SO H PACKAGE *CONNECTED INTERNALLY. DO NOT CONNECT EXTERNAL CIRCUITRY TO THESE PINS. 8-LEAD TO-5 METAL CAN **NO TRIM PIN ON LT1021-7. DO NOT CONNECT EXTERNAL CIRCUITRY TO PIN 5 ON LT1021-7 *CONNECTED INTERNALLY. DO NOT CONNECT EXTERNAL CIRCUITRY TO THESE PINS. T = 130C, = 130C/W (N) JMAX JA **NO TRIM PIN ON LT1021-7. DO NOT CONNECT EXTERNAL CIRCUITRY TO PIN 5 ON LT1021-7 T = 130C, = 150C/W (S) JMAX JA T = 150C, = 150C/W, = 45C/W JMAX JA JC ORDER PART NUMBER N8 ORDER PART NUMBER LT1021BCH-5 LT1021DCH-5 LT1021BCN8-5 LT1021BMH-5 LT1021DMH-5 LT1021CCN8-5 LT1021CCH-5 LT1021BCH-7 LT1021CIN8-5 LT1021CMH-5 LT1021BMH-7 LT1021DCN8-5 LT1021BMH-10 LT1021DCH-7 LT1021DIN8-5 LT1021DMH-7 LT1021BCN8-7 LT1021BCH-10 LT1021DCN8-7 LT1021CMH-10 LT1021BCN8-10 LT1021DCH-10 LT1021CCN8-10 LT1021DMH-10 LT1021CIN8-10 LT1021DCN8-10 OBSOLETE LT1021DIN8-10 S8 PART MARKING S8 ORDER PART NUMBER LT1021DCS8-5 2105 LT1021DCS8-7 2107 LT1021DCS8-10 2110 Order Options Tape and Reel: Add TR Lead Free: Add PBF Lead Free Tape and Reel: Add TRPBF Lead Free Part Marking: