AD8495CRMZ-R7

Overview

The AD8495CRMZ-R7 is a precision thermocouple amplifier designed for K-type sensors, manufactured by Analog Devices Inc. It integrates cold junction compensation and a fixed-gain instrumentation amplifier to provide a linear output of 5 mV/°C. The device operates on a single supply voltage ranging from 2.7 V to 36 V or dual supplies of ±2.7 V to ±18 V. It features an initial accuracy of ±1°C at 25°C and an ambient temperature rejection of 0.025°C/°C. The quiescent current is typically 180 μA, resulting in low power consumption of less than 1 mW at 5 V. The component is housed in an 8-lead MSOP package.

Feature Summary

• Integrated cold junction compensation with laser-wafer trimming for high accuracy
• High impedance differential inputs with overvoltage protection up to VS ± 25 V
• Thermocouple break detection capability via internal bias currents
• Reference pin allows offset adjustment for negative temperature measurement

Applications

• J or K type thermocouple temperature measurement systems
• Setpoint controllers requiring precise thermal regulation
• Exhaust gas and catalytic converter temperature sensing
• White goods such as ovens and stovetops

Procurement Notes

Verify the specific ordering suffix against the manufacturer's official documentation to confirm packaging details. Ensure that the procurement channel provides valid traceability for the Analog Devices brand. Cross-reference the part number with the latest datasheet revision to confirm compliance with RoHS standards and environmental specifications before finalizing orders.

Selection Notes

Select this component when interfacing directly with K-type thermocouples requiring a linear 5 mV/°C response. It is suitable for applications needing integrated cold junction compensation without external reference diodes. Consider the wide supply voltage range for industrial environments and the small MSOP footprint for space-constrained designs.

Part Context

This part belongs to the AD849x family of precision thermocouple amplifiers, which includes models optimized for J-type (AD8494, AD8496) and K-type (AD8495, AD8497) sensors. The AD8495 variant specifically targets full K-type ranges with an optimized ambient temperature range of 0°C to 50°C. It shares architectural similarities with the AD8494, AD8496, and AD8497 but differs in gain calibration and ambient optimization.

Replacement Considerations

The AD8495ARMZ is a direct functional equivalent within the same family, differing primarily in the reel packaging suffix rather than electrical performance. Both variants share identical specifications for K-type thermocouple amplification.