LTZ1000/LTZ1000A Ultra Precision Reference Fea T Descrip T n 1.2V Noise The LTZ1000 and LTZ1000A are ultra-stable temperature P-P n 2V/kHr Long-Term Stability controllable references. They are designed to provide 7V n Very Low Hysteresis outputs with temperature drifts of 0.05ppm/C, about n 0.05ppm/C Drift 1.2V of noise and long-term stability of 2V/kHr. P-P n Temperature Stabilized Included on the chip is a subsurface zener reference, a n 400C/W Thermal Resistance for LTZ1000A Reduces heater resistor for temperature stabilization, and a tem- Insulation Requirements perature sensing transistor. External circuitry is used to n Specified for 55C to 125C Temperature Range set operating currents and to temperature stabilize the n Offered in TO-99 package reference. This allows maximum flexibility and best long- term stability and noise. a T The LTZ1000 and LTZ1000A references can provide su- n Voltmeters perior performance to older devices such as the LM199, n Calibrators provided that the user implements the heater control and n Standard Cells properly manages the thermal layout. To simplify thermal n Scales insulation, the LTZ1000A uses a proprietary die attach n Low Noise RF Oscillators method to provide significantly higher thermal resistance than the LTZ1000. L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Typical a T Low Noise Reference Long-Term Stability 2 LTZ1000 V 10V IN OUTPUT 30k 1N4148 7 3 + 6 0 LT 1006 2 4 120 0.02F 2 1000 TA01 0 10 20 30 DAYS LONG-TERM STABILITY OF A TYPICAL DEVICE FROM TIME = 0 WITH NO PRECONDITIONING OR AGING 1000 TA01b 1000afe For more information www.linear.com/LTZ1000 1 (ppm) ion pplica ions pplica ion uresLTZ1000/LTZ1000A a T e Maxi Mu M r a T p c F T (Note 1) Heater to Substrate ...................................................35V BOTTOM VIEW 8 Collector Emitter Breakdown Q1 ...............................15V 7 1 Collector Emitter Breakdown Q2 ...............................35V Q2 Emitter Base Reverse Bias ..........................................2V 6 2 Operating Temperature Range .........55C T 125C A Q1 Storage Temperature Range ............65C T 150C A 7V 3 5 Substrate Forward Bias ............................................ 0.1V 4 H8 PACKAGE TO-5 METAL CAN T = 150C, JMAX LTZ1000CH: = 80C/W JA LTZ1000ACH: = 400C/W JA o r D i n F Ma T LEAD FREE FINISH PART MARKING PACKAGE DESCRIPTION SPECIFIED TEMPERATURE RANGE LTZ1000ACH PBF LTZ1000ACH 8-Lead TO-5 Metal Can (.200 Inch PCD) 55C to 125C LTZ1000CH PBF LTZ1000CH 8-Lead TO-5 Metal Can (.200 Inch PCD) 55C to 125C LEAD BASED FINISH PART MARKING PACKAGE DESCRIPTION SPECIFIED TEMPERATURE RANGE LTZ1000ACH LTZ1000ACH 8-Lead TO-5 Metal Can (.200 Inch PCD) 55C to 125C LTZ1000CH LTZ1000CH 8-Lead TO-5 Metal Can (.200 Inch PCD) 55C to 125C Consult LTC Marketing for parts specified with wider operating temperature ranges. For more information on lead free part marking, go to: