The AD8494/AD8495/AD8496/AD8497are 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 AD8494/AD8495/AD8496/AD8497 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 AD8494 and AD8496 are precalibrated by laser wafer trimming to match the characteristics of J type (iron-constantan) thermocouples; the AD8495 and AD8497 are laser trimmed to match the characteristics of K type (chromel-alumel) thermo-couples. See Table 1 on the data sheet for the optimized ambient temperature range of each part. The AD8494/AD8495/AD8496/AD8497 allow a wide variety of supply voltages. With a 5 V single supply, the 5 mV/°C output allows the devices to cover nearly 1000 degrees of a thermo-couple’s temperature range. The AD8494/AD8495/AD8496/AD8497 work with 3 V supplies, allowing them to interface directly to lower supply ADCs. They can also work with supplies as large as 36 V in industrial systems that require a wide common-mode input range. Product Highlights * Complete, precision laser wafer trimmed thermocouple signal conditioning system in a single IC package. * Flexible pinout provides for operation as a setpoint controller or as a standalone Celsius thermometer. * Rugged inputs withstand 4 kV ESD and provide over-voltage protection (OVP) up to VS ± 25 V. * Differential inputs reject common-mode noise on the thermocouple leads. * Reference pin voltage can be offset to measure 0°C on single supplies. * Available in a small, 8-lead MSOP that is fully RoHS compliant. Applications * J 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 * Low cost and easy to use * Pretrimmed for J type thermocouples * Internal cold junction compensation * High impedance differential input https://elecena.pl/product/1158348/full-j-type-range-25-to-100-thermocouple-amplifier-w-cold-junction-compensation 2010-09-01 https://elecena.pl/product/1158348/full-j-type-range-25-to-100-thermocouple-amplifier-w-cold-junction-compensation 2018-03-28 https://elecena.pl/product/1158348/full-j-type-range-25-to-100-thermocouple-amplifier-w-cold-junction-compensation 2025-01-19