LT1025ACN80

Sensor And Detector Interfaces Overview

The LT1025ACN8 is a micropower thermocouple cold junction compensator designed for use with Type E, J, K, R, S, and T thermocouples. It provides direct thermocouple voltage outputs scaled to the Seebeck coefficient at room temperature (25°C) alongside a dedicated 10mV/°C output. The device operates on a single supply voltage ranging from 4V to 36V with a typical supply current of 80mA. The 'A' version guarantees an initial accuracy of ±0.5°C at 25°C. It utilizes wafer-level and post-package trimming along with special curvature correction circuitry to maintain compensation accuracy over a wider temperature range.

Sensor And Detector Interfaces Feature Summary

• Provides direct thermocouple voltage outputs for Types E, J, K, R, S, and T matched to room temperature slopes.
• Includes a low-impedance 10mV/°C output suitable for driving external circuits.
• Features built-in nonlinearity correction to compensate for the parabolic error inherent in thermocouple characteristics.
• Operates with extremely low supply current to minimize self-heating effects.

Sensor And Detector Interfaces Applications

• Thermocouple cold junction compensation in industrial measurement systems
• Centigrade thermometer signal conditioning
• Temperature compensation networks requiring precise reference voltages

Sensor And Detector Interfaces Procurement Notes

Verify that the specific part number suffix matches the required package type, as the N8 designation indicates an 8-lead PDIP package. Confirm the 'A' grade suffix is present to ensure the tighter 0.5°C initial accuracy specification is met rather than the standard grade. Check datasheet revisions for any updates regarding operating temperature ranges or pin configurations before finalizing procurement orders.

Sensor And Detector Interfaces Selection Notes

Select the LT1025ACN8 when high initial accuracy is critical for thermocouple applications. Ensure the application environment allows placement near the cold junction to maintain isothermal conditions. Verify that the supply voltage remains within the 4V to 36V range. Consider the thermal resistance of the PCB layout if operating at higher supply voltages to prevent internal temperature rise from degrading accuracy.

Sensor And Detector Interfaces Part Context

The LT1025 series serves as a specialized analog front-end component for thermocouple interfaces. It replaces discrete resistor networks and temperature sensors previously used for cold junction compensation. The ACN8 variant specifically denotes the commercial temperature grade (0°C to 70°C) housed in a plastic dual in-line package, distinguishing it from military grade or surface mount alternatives.

Sensor And Detector Interfaces Replacement Considerations

Consult manufacturer documentation for direct substitutes. The LT1025CN8 offers similar functionality but with lower initial accuracy specifications. Surface mount equivalents include the LT1025CS8. Verify compatibility with existing thermocouple types and amplifier stages when considering alternative packages or grades.