AD8496ARMZ-R7

Overview

The AD8496ARMZ-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 operates on a single supply ranging from 2.7 V to 36 V or dual supplies of ±2.7 V to ±18 V. The device features an initial accuracy of ±1°C (max ±3°C) and ambient temperature rejection of 0.025°C/°C within the 25°C to 100°C range. Quiescent current is typically 180 μA, and it utilizes an 8-lead MSOP package.

Feature Summary

• Integrated cold junction compensation optimized for ambient temperatures between 25°C and 100°C
• High impedance differential inputs with overvoltage protection up to VS ± 25 V
• Reference pin allows offset adjustment for negative temperature measurement
• Thermocouple break detection capability via internal bias currents

Applications

• J-type thermocouple temperature measurement in industrial environments
• Exhaust gas temperature sensing
• Catalytic converter temperature monitoring
• White goods oven and stovetop temperature control

Procurement Notes

Verify the specific ordering suffix against manufacturer documentation to confirm packaging configuration. Ensure the component matches the required thermal grade and ambient operating range specifications before integration into the design.

Selection Notes

Select this model when the application requires precise J-type thermocouple amplification in high-ambient environments. The fixed gain and integrated compensation simplify circuit design compared to discrete solutions requiring external reference sensors.

Part Context

This component belongs to the AD849x family of precision thermocouple signal conditioners. It shares architectural similarities with the AD8494, AD8495, and AD8497, differing primarily in the laser-trimmed calibration for J-type thermocouples and the optimized ambient temperature range.

Replacement Considerations

AD8496ARMZ

FAQ

How does the AD8496 handle open thermocouple conditions?

The device detects broken thermocouples because its PNP input stage draws bias current out of the inputs. If the thermocouple is disconnected, the input rails high, causing the output to saturate.

What is the purpose of the REF pin?

The REF pin allows for offset adjustment. Driving this pin with a voltage enables the measurement of temperatures below 0°C when using a single positive supply.

Can the AD8496 operate with supplies lower than 5 V?

Yes, the device supports single supplies as low as 2.7 V, allowing direct interface with lower voltage ADCs while maintaining functionality.