Overview
The AD594CDZ, produced by Analog Devices Inc., is a comprehensive instrumentation amplifier and thermocouple cold junction compensator integrated on a monolithic chip. This device is specifically designed for use with type J (iron-constantan) thermocouples. It combines an ice point reference with a precalibrated amplifier to generate a high-level output (10 mV/°C) directly from the thermocouple signal. The AD594CDZ offers flexibility through pin-strapping options, allowing it to function as either a linear amplifier-compensator or a switched output setpoint controller with fixed or remote setpoint control.
The device includes a thermocouple failure alarm that indicates if one or both thermocouple leads become open, and it can be powered from a single-ended supply, including +5 V. With the addition of a negative supply, it can measure temperatures below 0°C. The AD594CDZ is known for its low power consumption, typically operating with a total supply current of 160 µA, and it is capable of delivering up to ±5 mA to a load.
Key Specifications
| Specification | Value |
|---|---|
| Thermocouple Type | Type J (iron-constantan) |
| Output Sensitivity | 10 mV/°C |
| Supply Voltage | Single-ended (including +5 V), with optional negative supply for temperatures below 0°C |
| Supply Current | Typically 160 µA (unloaded) |
| Output Current Capability | Up to ±5 mA |
| Operating Temperature Range | 0°C to +50°C |
| Calibration Accuracy | ±1°C (C version) |
| Package Type | 14-pin, hermetically sealed, side-brazed ceramic DIP |
Key Features
- Precalibrated amplifier for type J thermocouples through laser wafer trimming.
- Thermocouple failure alarm with TTL drive capability.
- Pin-strapping options for use as a linear amplifier-compensator or switched output setpoint controller.
- Low impedance voltage output, allowing it to function as a stand-alone Celsius transducer.
- Recalibration capability for other thermocouple types using external resistors.
- Low power consumption to minimize self-heating.
Applications
- Temperature measurement and control systems.
- Industrial process control.
- Aerospace and automotive applications requiring precise temperature monitoring.
- Medical devices and equipment that need accurate temperature sensing.
- Any application requiring high-accuracy thermocouple signal conditioning.
Q & A
- What type of thermocouple does the AD594CDZ support?
The AD594CDZ is precalibrated for type J (iron-constantan) thermocouples.
- What is the output sensitivity of the AD594CDZ?
The output sensitivity is 10 mV/°C.
- What is the typical supply current of the AD594CDZ?
The typical supply current is 160 µA when unloaded.
- Can the AD594CDZ measure temperatures below 0°C?
- What is the operating temperature range of the AD594CDZ?
The operating temperature range is from 0°C to +50°C.
- What is the calibration accuracy of the AD594CDZ?
The calibration accuracy is ±1°C for the C version.
- What package types are available for the AD594CDZ?
It is available in 14-pin, hermetically sealed, side-brazed ceramic DIP packages.
- Does the AD594CDZ have a thermocouple failure alarm?
- Can the AD594CDZ be used as a stand-alone Celsius transducer?
- Is the AD594CDZ recalibratable for other thermocouple types?
