Monolithic Thermocouple Amplifiers With Cold Junction Compensation

  The AD594 AD595 is a complete Instrumentation Amplifier and thermocouple cold junction compensator on a monolithic chip. It combines an ice point reference with a precalibrated amplifier to produce a high level (10 mV/?C) output directly from a thermocouple signal. Pin-strapping options allow it to be used as a linear amplifier-compensator or as a switched output setpoint controller using either fixed or remote setpoint control. It can be used to amplify its compensation voltage directly, thereby converting it to a stand-alone Celsius transducer with a low impedance voltage output. The AD594 AD595 includes a thermocouple failure alarm that indicates if one or both thermocouple leads become open. The alarm output has a flexible format which includes TTL drive capability. The AD594 AD595 can be powered from a single ended supply (including +5 V) and by including a negative supply, temperatures below 0?C can be measured. To minimize self-heating, an unloaded AD594 AD595 will typically operate with a total supply current 160 uA, but is also capable of delivering in excess of ? 5 mA to a load. The AD594 is precalibrated by laser wafer trimming to match the characteristic of type J (iron-constantan) thermocouples and the AD595 is laser trimmed for type K (chromel-alumel) inputs. The temperature transducer voltages and gain control ResistorsAD595CQ's datasheet is the same as AD594
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AD594 pinout from datasheet
Analog Devices, Inc.

Download AD595CQ datasheet