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Series Information for AD594CQ - Analog Devices


  • feature
    Pretrimmed for Type J (AD594) or Type K (AD595) Thermocouples Can Be Used with Type T Thermocouple Inputs Low Impedance Voltage Output: 10 mV/u2d17C Built-In Ice Point Compensation Wide Power Supply Range: +5 V to u2d1e15 V Low Power: <1 mW typical Thermocouple Failure Alarm Laser Wafer Trimmed to 1u2d17C Calibration Accuracy Setpoint Mode Operation Self-Contained Celsius Thermometer Operation High Impedance Differential Input Side-Brazed DIP or Low Cost Cerdip
AD594CQ image
Not RoHS Compliant



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 ther- mocouple 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, tempera- tures below 0°C can be measured. To minimize self-heating, an unloaded AD594/AD595 will typically operate with a total sup- ply 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 trimmed for type K (chromel-alumel) inputs. The temperature transducer voltages and gain control resistors are available at the package pins so that the circuit can be recalibrated for the thermocouple types by the addition of two or three resistors. These terminals also allow more precise cali- bration for both thermocouple and thermometer applications. The AD594/AD595 is available in two performance grades. The C and the A versions have calibration accuracies of ±1°C and ±3°C, respectively. Both are designed to be used from 0°C to +50°C, and are available in 14-pin, hermetically sealed, side- brazed ceramic DIPs as well as low cost cerdip packages.


IC Output Type:
Sensing Accuracy Range:
± 1°C
Sensing Temperature Min:
Sensing Temperature Max:
Sensor Case Style:
No. of Pins:
Supply Voltage Min:
Supply Voltage Max:
Product Range:
Automotive Qualification Standard:
RoHS Phthalates Compliant:
No SVHC (07-Jul-2017)

Alternate Descriptions

Newark Electronics
TEMPERATURE SENSOR, 1DEG C, DIP-14; IC Output Type:Analogue; Sensing Accuracy Range:± 1°C; Sensing Temperature Min:-55°C; Sensing Temperature Max:125°C; Sensor Case Style:DIP; No. of Pins:14Pins; Supply Voltage Min:4.5V; Supply RoHS Compliant: No
RS Components SG
Type J Thermocouple Amplifier 1C CDIP14