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ad8494/ad8495/ad8496/ad8497带冷端补偿的精密热电偶放大器
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The AD8494/AD8495/AD8496/AD8497 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 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 selfheating， 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） thermocouples. See Table 1 for the optimized ambient temperature range of each part.
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