LT1021: Precision Reference Data Sheet8/28/2007
Features and Benefits
- Ultralow Drift: 5ppm/°C Max Slope
- Very Low Noise: P-P (0.1Hz to 10Hz)
- 100% Noise Tested
- Pin Compatible with Most Bandgap Reference Applications, Including REF01, REF02, LM368, MC1400 and MC1404 with Greatly Improved Stability, Noise and Drift
- Trimmed Output Voltage
- Operates in Series or Shunt Mode
- Output Sinks and Sources in Series Mode
- >100dB Ripple Rejection
- Minimum Input/Output Differential of 1V
- Available in 5-Lead Can, N8 and S8 Packages
The LT1021 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 three terminal connection. Special care has been taken to minimize thermal regulation 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 LT1021 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 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%.
- A/D and D/A Converters
- Precision Regulators
- Digital Voltmeters
- Inertial Navigation Systems
- Precision Scales
- Portable Reference Standard
Product Lifecycle Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Documentation & Resources
R003 Reliability Data3/26/2018
AN29 - Some Thoughts on DC-DC Converters3/8/2013
AN17 - Considerations for Successive Approximation A ->D Converters8/15/2012
AN13 - High Speed Comparator Techniques8/15/2012
AN43 - Bridge Circuits7/10/2012
AN82 - Understanding and Applying Voltage References2/3/2011
AN42 - Voltage Reference Circuit Collection2/3/2011
AN23 - Micropower Circuits for Signal Conditioning6/7/2010
AN14 - Designs for High Performance Voltage-to-Frequency Converters3/26/2010
AN7 - Some Techniques for Direct Digitization of Transducer Outputs3/26/2010
AN74 - Component and Measurement Advances Ensure 16-Bit DAC Settling Time8/20/2007
AN62 - Data Acquisition Circuit Collection8/20/2007
DN35 - 12-Bit 8-Channel Data Acquisition System Interfaces to IBM PC Serial Port7/22/2014
DN19 - A Two Wire Isolated and Powered 10-Bit Data Acquisition System7/9/2014
DN138 - Micropower ADC and DAC in SO-8 Give PCs a 12-Bit Analog Interface6/27/2014
DN294 - 250ksps, 16-Bit Micropower ADC Offers an Excellent Combination of SIze, Power and Speed8/21/2007
Design Note 29: A Single Supply RS232 Interface for Bipolar A to D Converters11/1/1989
Design Note 10: Electrically Isolating Data Acquisition Systems4/1/1988
Dual Operational Amplifier Combines 16-Bit Precision with High Speed5/1/2000 LT Journal
Tools & Simulations
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Models for the following parts are available in LTspice:
LT1021 Companion Parts
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