Overview
The AD594CQ, produced by Analog Devices Inc., is a complete instrumentation amplifier and thermocouple cold junction compensator integrated into a single monolithic chip. This device is specifically precalibrated for type J (iron-constantan) thermocouples. It combines an ice point reference with a precalibrated amplifier to produce a high-level output directly from a thermocouple signal, making it suitable for precise temperature measurements.
The AD594CQ is part of the AD594/AD595 family, which includes versions calibrated for different thermocouple types. The device offers flexibility in its configuration, allowing it to be used as a linear amplifier-compensator or as a switched output setpoint controller. It also features a thermocouple failure alarm and can operate with a single-ended supply, including +5 V, with the option to include a negative supply for measuring temperatures below 0°C.
Key Specifications
| Parameter | Min | Typ | Max | Units |
|---|---|---|---|---|
| Supply Voltage Range | +5 V to +30 V | - | - | V |
| Operating Temperature Range | 0°C | - | +50°C | °C |
| Calibration Accuracy | - | - | ±1°C (C version) | °C |
| Output Voltage | - | 10 mV/°C | - | mV/°C |
| Power Consumption | - | < 1 mW | - | mW |
| Package Type | - | 14-pin, hermetically sealed, side-brazed ceramic DIP or low cost cerdip | - | - |
| Thermocouple Type | - | Type J (iron-constantan) | - | - |
Key Features
- Pretrimmed for Type J (iron-constantan) thermocouples, with the ability to be recalibrated for other thermocouple types using external resistors.
- Provides cold junction compensation, amplification, and an output buffer in a single IC package.
- Low impedance voltage output of 10 mV/°C.
- Built-in ice point compensation and thermocouple failure alarm.
- Wide power supply range from +5 V to +30 V.
- Low power consumption, typically less than 1 mW.
- Setpoint mode operation and self-contained Celsius thermometer operation.
- High impedance differential input and side-brazed DIP or low cost cerdip packaging options.
Applications
The AD594CQ is suitable for a variety of temperature measurement applications, including industrial process control, medical devices, and automotive systems. It is particularly useful in environments where precise temperature monitoring is critical, such as in HVAC systems, temperature sensors, and data loggers.
The device's ability to operate with different supply voltages and its low power consumption make it versatile for use in both standalone and integrated systems.
Q & A
- What is the primary function of the AD594CQ?
The AD594CQ is a complete instrumentation amplifier and thermocouple cold junction compensator designed to provide precise temperature measurements from thermocouple signals.
- What type of thermocouple is the AD594CQ precalibrated for?
The AD594CQ is precalibrated for type J (iron-constantan) thermocouples.
- What is the output voltage of the AD594CQ per degree Celsius?
The output voltage is 10 mV/°C.
- What is the operating temperature range of the AD594CQ?
The operating temperature range is from 0°C to +50°C.
- Can the AD594CQ be used with other types of thermocouples?
- What is the power supply range for the AD594CQ?
The AD594CQ can operate with a supply voltage range from +5 V to +30 V.
- Does the AD594CQ have a thermocouple failure alarm?
- What are the packaging options for the AD594CQ?
The AD594CQ is available in 14-pin, hermetically sealed, side-brazed ceramic DIPs and low cost cerdip packages.
- How much power does the AD594CQ typically consume?
The AD594CQ typically consumes less than 1 mW of power.
- Can the AD594CQ be used in setpoint mode operation?
