AD8496ARMZ

Overview

The AD8496ARMZ 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. Initial accuracy is specified at ±3°C (Grade C) or ±1°C (Grade A). The ambient temperature range is 25°C to 100°C, while the operational range extends from -40°C to +125°C. Quiescent current is typically 180 μA.

Feature Summary

• Integrated cold junction compensation and fixed-gain instrumentation amplifier
• Laser-wafer trimmed for J-type thermocouple linearity
• High impedance differential inputs with overvoltage protection
• Reference pin allows offset adjustment for negative temperature measurement

Applications

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

Procurement Notes

Verify the specific grade (A or C) required for initial accuracy specifications during procurement. Confirm that the MSOP-8 package variant matches the PCB footprint requirements. Ensure the ordering suffix corresponds to the desired tube or reel packaging format as defined by Analog Devices. Cross-reference the datasheet revision to confirm parameter consistency.

Selection Notes

Select the AD8496ARMZ when J-type thermocouples are used in ambient temperatures between 25°C and 100°C. Choose this part over the AD8494 if the application environment exceeds standard laboratory temperatures. Verify that the 5 mV/°C transfer function aligns with the downstream ADC input voltage range. Consider the 180 μA quiescent current for low-power system designs.

Part Context

The AD8496 is part of the AD8494/AD8495/AD8496/AD8497 family of precision thermocouple amplifiers. Unlike the AD8494, which is optimized for 0°C to 50°C ambient ranges, the AD8496 is calibrated for higher ambient temperatures up to 100°C. All devices share the same 8-lead MSOP package and functional architecture but differ in laser trimming for specific thermocouple types and ambient optimization.

Replacement Considerations

The AD8494 is a direct functional substitute for J-type applications operating within 0°C to 50°C ambient ranges. For K-type thermocouples, the AD8495 or AD8497 should be considered instead. Verify that any replacement maintains the 5 mV/°C output scaling and compatible supply voltage ranges.