LT1021

Features:

*Pin Compatible with Most Bandgap Reference
*Applications, Including Ref 01, Ref 02, LM368
*MC1400 and MC1404 with Greatly Improved
*Stability, Noise and Drift
*Ultralow Drift: 5ppm/°C Max Slope
*Trimmed Output Voltage
*Operates in Series or Shunt Mode
*Output Sinks and Sources in Series Mode
*Very Low Noise: <1ppmP-P (0.1Hz to 10Hz)>100dB Ripple Rejection
*Minimum Input/Output Differential of 1V
*100% Noise Tested


Application

A/D and D/A Converters
Precision Regulators
Digital Voltmeters
Inertial Navigation Systems
Precision Scales
Portable Reference Standard


Pinout




Specifications

Input Voltage ..........................................................  40V
Input/Output Voltage Differential ............................  35V
Output-to-Ground Voltage (Shunt Mode Current Limit)
LT1021-5................................................................... 10V
LT1021-7................................................................... 10V
LT1021-10................................................................. 16V
Trim Pin-to-Ground Voltage
Positive ..................................................... Equal to V_OUT
Negative ............................................................... 20V
Output Short-Circuit Duration
V_IN = 35V............................................................... 10 sec
V_IN  20V ......................................................... Indefinite
Operating Temperature Range
Commercial................................................. 0°C to 70°C
Industrial..............................................  40°C to 85°C
Military ...............................................  55°C to 125°C
Storage Temperature Range..............  65°C to 150°C
Lead  Temperature (Soldering, 10 sec)................. 300°C


Description

The LT^@1021 is a precision reference with ultralow drift and noise, extremely good long term stability and almost total immunity to input voltage variations. The reference output will both source and sink up to 10mA. Three voltages are available: 5V, 7V and 10V. The 7V and 10V units can be used as shunt regulators (two-terminal zeners)with the same precision characteristics as the threeterminal connection. Special care has been taken to minimize thermal thermal effects and temperature induced hysteresis.


The LT1021 references are based on a buried zener diode structure that eliminates noise and stability problems associated with surface breakdown devices. Further, a subsurface zener exhibits better temperature drift and time stability than even the best bandgap references. Unique circuit design makes the device the first IC reference to offer ultralow drift without the use of high power on-chip heaters.


The LT1021-7 uses no resistive divider to set output Portable Reference Standard voltage, and therefore exhibits the best long term stability 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%.