AD8495ARMZ-R7

Overview

The AD8495ARMZ-R7 is a precision K-type thermocouple amplifier with integrated cold junction compensation. It provides a linear 5 mV/°C output voltage proportional to the measurement junction temperature. The device features high impedance differential inputs, laser wafer trimming for ±1°C initial accuracy, and ambient temperature rejection of 0.025°C/°C within its optimized range of 0°C to 50°C. It operates on single supplies from 2.7 V to 36 V or dual supplies from ±2.7 V to ±18 V, consuming typically 180 μA. The part includes thermocouple break detection and overvoltage protection up to VS ± 25 V.

Feature Summary

• Integrated cold junction compensation using an internal temperature sensor
• Laser-wafer trimmed for precise K-type thermocouple signal conditioning
• High common-mode rejection ratio to suppress noise on long leads
• Robust input stage with overvoltage protection and ESD withstand capability

Applications

• J or K type thermocouple temperature measurement systems
• Setpoint controllers for industrial heating applications
• White goods temperature sensing such as ovens and stovetops
• Exhaust gas and catalytic converter temperature monitoring

Procurement Notes

Verify the specific ordering suffix against the manufacturer's current documentation to ensure correct packaging configuration. Confirm that the component meets all applicable environmental compliance standards required for the target deployment region before finalizing procurement orders.

Selection Notes

Select this model specifically for K-type thermocouples due to its unique gain calibration. Ensure the application environment falls within the 0°C to 50°C ambient range for optimal accuracy specifications. Verify that the supply voltage supports the required measurement junction temperature range without exceeding output swing limits.

Part Context

This component belongs to the AD849x family of precision thermocouple amplifiers manufactured by Analog Devices. It shares architectural similarities with the AD8494, AD8496, and AD8497 but is distinctively calibrated for K-type sensors. The family utilizes a fixed-gain instrumentation amplifier combined with on-chip thermal sensing for direct Celsius output.

Replacement Considerations

The AD8497 serves as a functional substitute for K-type applications requiring operation in higher ambient temperatures (25°C to 100°C). Direct pin-to-pin replacement requires verifying that the ambient temperature operating range aligns with the system requirements.