AD8495ARMZ Instrumentation Amplifier, Thermocouple Type K, 25 kHz, MSOP-8

AD 8495 A The AD8495 are precision instrumentation amplifiers with thermocouple cold junction compensators on an integrated circuit. They produce a high level (5 mV/°C) output directly from a thermocouple signal by combining an ice point reference with a precalibrated amplifier. They can be used as standalone thermometers or as switched output setpoint controllers using either a fixed or remote setpoint control. The AD8495 can be powered from a single-ended supply (less than 3 V) and can measure temperatures below 0°C by offsetting the reference input. To minimize self-heating, an unloaded AD849x typically operates with a total supply current of 180 µA, but it is also capable of delivering in excess of ±5 mA to a load. The AD8495 are precalibrated by laser wafer trimming to match the characteristics of J type (iron-constantan) thermocouples. See Table 1 for the optimized ambient temperature range.

- Low cost and easy to use - Pretrimmed for J or K type thermocouples - Internal cold junction compensation - High impedance differential input - Standalone 5 mV/°C thermometer - Reference pin allows offset adjustment - Thermocouple break detection - Laser wafer trimmed to 1°C initial accuracy and 0.025°C/°C ambient temperature rejection - Low power: - Wide power supply range - Single supply: 2.7 V to 36 V - Dual supply: ±2.7 V to ±18 V - Small, 8-lead MSOP

APPLICATIONS - K type thermocouple temperature measurement - Setpoint controller - Celsius thermometer - Universal cold junction compensator - White goods (oven, stove top) temperature measurements - Exhaust gas temperature sensing - Catalytic converter temperature sensing