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AD594

Analog Devices
Part Number AD594
Manufacturer Analog Devices
Description Monolithic Thermocouple Amplifiers with Cold Junction Compensation
Published Mar 23, 2005
Detailed Description a FEATURES Pretrimmed for Type J (AD594) or Type K (AD595) Thermocouples Can Be Used with Type T Thermocouple Inputs Low...
Datasheet PDF File AD594 PDF File

AD594
AD594

Overview
a FEATURES Pretrimmed for Type J (AD594) or Type K (AD595) Thermocouples Can Be Used with Type T Thermocouple Inputs Low Impedance Voltage Output: 10 mV/؇ C Built-In Ice Point Compensation Wide Power Supply Range: +5 V to ؎15 V Low Power: <1 mW typical Thermocouple Failure Alarm Laser Wafer Trimmed to 1؇ C Calibration Accuracy Setpoint Mode Operation Self-Contained Celsius Thermometer Operation High Impedance Differential Input Side-Brazed DIP or Low Cost Cerdip Monolithic Thermocouple Amplifiers with Cold Junction Compensation AD594/AD595 FUNCTIONAL BLOCK DIAGRAM –IN 14 –ALM 13 +ALM 12 V+ 11 COMP 10 VO 9 FB 8 OVERLOAD DETECT AD594/AD595 +A G G +TC ICE POINT COMP.
–TC 1 +IN 2 +C 3 +T 4 COM 5 –T 6 –C 7 V– PRODUCT DESCRIPTION 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 µA, 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 t...


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