LT1236 Precision Reference DESCRIPTIO FEATURES n The LT 1236 is a precision reference that combines ultra- Ultra-Low Drift: 5ppm/C Max n low drift and noise with excellent long-term stability and Trimmed to High Accuracy: 0.05% Max n high output accuracy. The reference output will both Industrial Temperature Range SO Package n source and sink up to 10mA and is almost totally immune Operates in Series or Shunt Mode n to input voltage variations. Two voltages are available: 5V Pin Compatible with AD586, AD587 n and 10V. The 10V version can be used as a shunt regulator Output Sinks and Sources in Series Mode n (two-terminal zener) with the same precision characteris- Very Low Noise < 1ppm (0.1Hz to 10Hz) P-P n tics as the three-terminal connection. Special care has 100% Noise Tested n been taken to minimize thermal regulation effects and > 100dB Ripple Rejection n temperature induced hysteresis. Minimum Input/Output Differential of 1V The LT1236 combines both superior accuracy and tem- perature coefficient specifications without the use of high PPLICATI S A power, on-chip heaters. The LT1236 references are based n A/D and D/A Converters on a buried zener diode structure which eliminates noise n Precision Regulators and stability problems with surface breakdown devices. n Precision Scales Further, a subsurface zener exhibits better temperature n Inertial Navigation Systems drift and time stability than even the best band-gap n Digital Voltmeters references. , LTC and LT are registered trademarks of Linear Technology Corporation. TYPICAL APPLICATI Basic Positive and Negative Connections Typical Distribution of Temperature Drift 24 DISTRIBUTION 22 OF THREE RUNS LT1236 LT1236-10 20 V IN V IN OUT NC OUT IN OUT 18 GND GND 16 14 V OUT 12 V (V ) OUT 10 R1 = R1 I + 1.5mA LOAD 8 15V 6 (V ) 4 LT1236 TA01 2 0 3 2 1 0 1 23 OUTPUT DRIFT (ppm/C) LT1236 TA02 1 UNITS (%) UO UO ULT1236 ABSOLUTEXAI U RATI GS 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 LT1236-5............................................................. 10V Operating Temperature Range LT1236-10 ........................................................... 16V LT1236AC, BC, CC.................................. 0C to 70C Trim Pin-to-Ground Voltage LT1236AI, BI, CI ................................ 40C to 85C Positive................................................ Equal to V Storage Temperature Range ................ 65C to 150C OUT Negative ........................................................... 20V Lead Temperature (Soldering, 10 sec)................ 300C PACKAGE/ORDER I FOR ATIO ORDER PART ORDER PART NUMBER NUMBER TOP VIEW TOP VIEW LT1236ACN8-5 LT1236ACS8-5 LT1236AIS8-5 NC* 1 8 NC* LT1236BCN8-5 NC* 1 8 NC* LT1236BCS8-5 LT1236BIS8-5 V 2 7 NC* LT1236CCN8-5 V 2 NC* LT1236CCS8-5 LT1236CIS8-5 IN 7 IN NC* 3 V LT1236ACN8-10 LT1236ACS8-10 LT1236AIS8-10 6 NC* 3 6 V 0UT 0UT LT1236BCN8-10 LT1236BCS8-10 LT1236BIS8-10 GND 4 5 TRIM** GND TRIM** 4 5 LT1236CCN8-10 LT1236CCS8-10 LT1236CIS8-10 N8 PACKAGE S8 PACKAGE LT1236AIN8-5 8-LEAD PDIP 8-LEAD PLASTIC SO * CONNECTED INTERNALLY. LT1236BIN8-5 S8 PART MARKING * CONNECTED INTERNALLY. D0 NOT CONNECT EXTERNAL D0 NOT CONNECT EXTERNAL LT1236CIN8-5 CIRCUITRY TO THESE PINS CIRCUITRY TO THESE PINS 236AC5 236AI5 LT1236AIN8-10 ** SEE APPLICATIONS ** SEE APPLICATIONS 236BC5 236BI5 INFORMATION SECTION INFORMATION SECTION LT1236BIN8-10 236CC5 236CI5 T = 125C, = 130C/W T = 125C, = 190C/W JMAX JA JMAX JA LT1236CIN8-10 236AC1 236AI1 236BC1 236BI1 236CC1 236CI1 Consult factory for Military grade parts. ELECTRICAL CHARACTERISTICS V = 10V, I = 0, T = 25C, unless otherwise noted. IN OUT A LT1236-5 PARAMETER CONDITIONS MIN TYP MAX UNITS Output Voltage (Note 1) LT1236A-5 4.9975 5.000 5.0025 V LT1236B-5/LT1236C-5 4.9950 5.000 5.0050 V Output Voltage Temperature Coefficient (Note 2) T T T MIN J MAX LT1236A-5 2 5 ppm/C LT1236B-5 5 10 ppm/C LT1236C-5 10 15 ppm/C Line Regulation (Note 3) 7.2V V 10V 4 12 ppm/V IN l 20 ppm/V 10V V 40V 2 6 ppm/V IN l 10 ppm/V Load Regulation (Sourcing Current) 0 I 10mA 10 20 ppm/mA OUT (Note 3) l 35 ppm/mA 2 U WU U W W W