LT1019ACH-4.5

Voltage Reference Overview

The LT1019ACH-4.5 is a third-generation bandgap voltage reference utilizing thin film technology and curvature correction. It provides a nominal output of 4.5V with an initial accuracy of 0.05% and a typical temperature coefficient of 3ppm/°C. The device operates in series or shunt modes, sourcing or sinking up to 10mA. It features ultrahigh line rejection of approximately 0.5ppm/V and low output impedance of roughly 0.02Ω. Designed for industrial applications, it functions within a temperature range of 0°C to 70°C.

Voltage Reference Feature Summary

• Third-generation bandgap architecture with thin film technology and improved curvature correction
• Capable of both sourcing and sinking current up to 10mA for flexible circuit integration
• Operates in either series or shunt configurations without requiring external components
• Includes a dedicated temperature output pin providing a proportional-to-absolute-temperature signal

Voltage Reference Applications

• A/D and D/A converters
• Precision regulators
• Constant current sources
• V/F converters
• Bridge excitation

Voltage Reference Procurement Notes

Verify the specific suffix 'ACH' corresponds to the required industrial temperature range (0°C to 70°C) and 0.05% accuracy. Confirm package type matches design requirements, as this part number typically denotes the TO-5 metal can variant. Ensure compatibility with existing system thermal management strategies due to specified thermal regulation characteristics.

Voltage Reference Selection Notes

Select this component when high precision and stability are required over the industrial temperature range. The 4.5V output suits specific DAC/ADC reference needs. Consider the available packages; if surface mount is preferred, verify equivalent S8 or N8 variants like LT1019ACS8-4.5 or LT1019ACN8-4.5 which share similar electrical specifications but differ in physical form factor.

Voltage Reference Part Context

The LT1019 series represents a family of precision references from Analog Devices (formerly Linear Technology). It serves as a direct replacement for older bandgap references such as the AD580, REF-01, and LM168. The ACH variant specifically targets industrial environments with tighter initial tolerance compared to standard C-grade parts.

Voltage Reference Replacement Considerations

LT1019CN8-4.5

Voltage Reference FAQ

How does the LT1019 handle thermal effects during operation?

The datasheet specifies thermal regulation at 0.5ppm/mW. Designers must account for die temperature gradients caused by power dissipation changes, which can shift the output voltage independently of the ambient temperature coefficient.

What is the function of the TEMP pin?

The TEMP pin provides a voltage directly proportional to absolute temperature (PTAT) with a slope of approximately 2.1mV/°C. It is intended for measuring relative temperature changes rather than absolute temperature measurement.