AD8494CRMZ-R7

Overview

The AD8494CRMZ-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 directly from the thermocouple signal. The device operates on a single supply 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 and ambient temperature rejection of 0.025°C/°C within the 0°C to 50°C range. Quiescent current is typically 180 μA, resulting in low power consumption under 1 mW at 5 V. The component is housed in an 8-lead MSOP package.

Feature Summary

• Integrated instrumentation amplifier with laser-wafer trimming for J-type thermocouple linearity
• On-chip temperature sensor performs automatic cold junction compensation
• High impedance differential inputs reject common-mode noise
• Robust input protection withstands overvoltage up to VS ± 25 V

Applications

• J-type thermocouple temperature measurement systems
• Setpoint controllers using fixed or remote reference voltages
• Standalone Celsius thermometer 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 manufacturer documentation to confirm tape-and-reel packaging and RoHS compliance status. Ensure the component matches the required grade specifications for your application environment. Cross-reference the part number with official distributor catalogs to validate availability and authenticity before procurement.

Selection Notes

Select this model when utilizing J-type thermocouples requiring high accuracy within a 0°C to 50°C ambient range. Consider the AD8495 if K-type compatibility is needed instead. Evaluate the wide supply voltage range capability for industrial environments. Verify that the 5 mV/°C output scaling fits the input requirements of downstream analog-to-digital converters.

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 optimized for laboratory-like conditions around 25°C ambient temperature.

Replacement Considerations

The AD8494ARMZ serves as a direct pin-compatible alternative within the same product family. Both devices share identical electrical characteristics and functionality for J-type thermocouple applications. Verify package compatibility and ordering suffixes when substituting.