The AD8494 is a precision thermocouple amplifier with cold junction compensation, specifically designed for J‑type thermocouples. It produces a high‑level (5 mV/°C) output directly from a thermocouple signal by combining an ice‑point reference with a precalibrated amplifier.

| Parameter | Specification | |-----------|---------------| | Supply Voltage | Single 2.7V–36V / Dual ±2.7V–±18V | | Quiescent Current | 180 μA (typ) | | Input Bias Current | 25 nA | | Output Current | 7 mA | | Noise Density | 32 nV/√Hz @ 1 kHz | | Operating Temp | -40°C ~ +125°C | | Package | 8‑MSOP |

- Internal cold‑junction compensation - High‑impedance differential input - Thermocouple break detection - Laser‑wafer trimming, initial accuracy 1°C - Reference pin for offset adjustment

- J‑type thermocouple temperature measurement - Set‑point controllers - Celsius thermometers - General‑purpose cold‑junction compensators - Appliance (oven, cooktop) temperature sensing - Exhaust gas and catalytic converter temperature sensing ---