AD8494ARMZ-R7

Overview

The AD8494ARMZ-R7 is a precision thermocouple amplifier with integrated cold junction compensation, optimized for J-type thermocouples. It provides a linear output of 5 mV/°C and features laser wafer trimming for 1°C initial accuracy at 25°C. The device operates on a single supply from 2.7 V to 36 V or dual supplies of ±2.7 V to ±18 V, consuming typically 180 μA. It includes high impedance differential inputs, overvoltage protection up to VS ± 25 V, and a reference pin for offset adjustment. The -3 dB bandwidth is 30 kHz, and it is housed in an 8-lead MSOP package.

Feature Summary

• Integrated cold junction compensation using an internal temperature sensor
• Laser-wafer trimmed for precise J-type thermocouple signal conditioning
• High common-mode rejection ratio to suppress noise on long leads
• Robust input protection against electrostatic discharge and overvoltage

Applications

• J-type thermocouple temperature measurement systems
• Setpoint controllers for industrial heating applications
• Standalone Celsius thermometer configurations
• White goods such as ovens and stovetops
• Exhaust gas and catalytic converter temperature sensing

Procurement Notes

Verify the specific ordering suffix R7 corresponds to the reel packaging format required for your assembly line. Confirm that the component meets RoHS compliance standards for your region. Ensure the ambient operating range aligns with the 0°C to 50°C specification for optimal performance. Check for any recent product change notices regarding manufacturing updates.

Selection Notes

Select this part when using J-type thermocouples requiring high accuracy within a 0°C to 50°C ambient range. Consider alternative models like the AD8495 if K-type thermocouples are necessary. Evaluate power supply constraints, as the device supports wide voltage ranges. Assess thermal management needs if driving heavy loads near the maximum current limits.

Part Context

This component belongs to the AD849x family of precision thermocouple amplifiers manufactured by Analog Devices. The family includes variants optimized for different thermocouple types and ambient temperature ranges. The AD8494 specifically targets J-type sensors with calibration centered around room temperature environments.

Replacement Considerations

The AD8494ARMZ is the direct non-reel equivalent. For K-type applications, consider the AD8495ARMZ. For higher ambient temperature environments, evaluate the AD8496ARMZ.