LT1034

LT1034 Micropower Dual Reference

Overview

The LT1034 is a high-precision, micropower dual voltage reference that combines a 1.2V/2.5V band-gap reference with a 7V auxiliary zener reference. Designed for applications requiring stable voltage references with minimal power consumption, the LT1034 offers excellent temperature drift performance, low dynamic impedance, and robust operation across a wide current range. Its thin-film construction ensures high accuracy and long-term stability, making it ideal for precision analog circuits, battery-powered devices, and industrial systems.

Features

• Dual Reference Outputs: Combines a 1.2V/2.5V band-gap reference with a 7V zener reference.
• Low Temperature Drift: Guaranteed 20 ppm/°C drift for the 1.2V/2.5V reference (40 ppm/°C in SO-8 package).
• Micropower Operation: Operates on as little as 20µA, making it suitable for battery-powered applications.
• Wide Operating Current Range: Supports 20µA to 20mA for the 1.2V reference.
• Low Dynamic Impedance: 1Ω dynamic impedance ensures stability under varying load conditions.
• High Initial Accuracy: 1% initial tolerance for precise voltage referencing.
• Low Hysteresis: Minimal temperature cycling hysteresis for consistent performance.
• Long-Term Stability: Excellent aging characteristics for reliable operation over time.

Applications

The LT1034 is widely used in precision analog and mixed-signal systems where stable voltage references are critical. Key applications include:

• Battery-Powered Devices: Portable instrumentation, medical devices, and IoT sensors benefit from its low power consumption.
• Data Acquisition Systems: Provides stable references for ADCs, DACs, and signal conditioning circuits.
• Industrial Control Systems: Used in process control, automation, and measurement equipment.
• Voltage Regulators: Acts as a stable reference for linear and switching regulators.
• Test and Measurement Equipment: Ensures accuracy in multimeters, oscilloscopes, and calibration tools.
• Automotive Electronics: Suitable for engine control units, sensors, and infotainment systems.

Electrical Characteristics

The following table summarizes the key electrical specifications of the LT1034 under typical operating conditions (unless otherwise noted):

• 1.2V/2.5V Reference:
  • Output Voltage: 1.2V or 2.5V (selectable)
  • Initial Accuracy: ±1%
  • Temperature Drift: 20 ppm/°C (40 ppm/°C for SO-8)
  • Operating Current Range: 20µA to 20mA
  • Dynamic Impedance: 1Ω
• 7V Auxiliary Reference:
  • Output Voltage: 7V
  • Operating Current: 100µA (typical)
  • Zener Breakdown Characteristics: Subsurface construction for low noise
• General Specifications:
  • Supply Voltage Range: 4V to 30V
  • Power Consumption: <1mW (typical at 20µA operation)
  • Long-Term Stability: <50 ppm/1000 hours

Package Information

The LT1034 is available in multiple package options to suit different application requirements:

• 8-Pin PDIP (Plastic Dual In-Line Package):
  • Wide temperature range: -40°C to +85°C
  • Through-hole mounting for prototyping and industrial use
• 8-Pin SOIC (Small Outline Integrated Circuit):
  • Surface-mount design for compact PCB layouts
  • Temperature drift: 40 ppm/°C (specified)
• Custom Packages: Available upon request for high-volume applications.

Design Considerations

When integrating the LT1034 into a circuit, consider the following guidelines to ensure optimal performance:

• Supply Decoupling: Use a 0.1µF ceramic capacitor close to the supply pin to minimize noise.
• Load Regulation: The low dynamic impedance (1Ω) ensures stability, but avoid excessive capacitive loads (>10µF) without isolation.
• Thermal Management: For precision applications, minimize temperature gradients across the package to reduce drift.
• PCB Layout: Keep traces short and away from high-frequency signals to prevent noise coupling.

Conclusion

The LT1034 is a versatile, high-performance dual voltage reference that combines micropower operation with exceptional accuracy and stability. Its dual-output design, low drift, and robust electrical characteristics make it an excellent choice for a wide range of precision applications. Whether used in portable electronics, industrial systems, or automotive designs, the LT1034 delivers reliable performance under demanding conditions.