Overview
The AD595AQ, produced by Analog Devices Inc., is a complete instrumentation amplifier and thermocouple cold junction compensator integrated on a monolithic chip. It is specifically designed for type K (chromel-alumel) thermocouples and combines an ice point reference with a precalibrated amplifier to produce a high-level output (10 mV/°C) directly from the thermocouple signal. This device is versatile, allowing it to be used as a linear amplifier-compensator or as a switched output setpoint controller with either fixed or remote setpoint control.
Key Specifications
| Parameter | Value |
|---|---|
| Thermocouple Type | Type K (chromel-alumel) |
| Output Voltage | 10 mV/°C |
| Supply Voltage | +5 V (single-ended), +VS to –VS ≤ 30 V (dual supply) |
| Operating Temperature Range | 0°C to +50°C |
| Calibration Accuracy | ±1°C (C version), ±3°C (A version) |
| Package Type | 14-pin, hermetically sealed, side-brazed ceramic DIP or low-cost cerdip |
| Quiescent Current | 160 µA (no load) |
| Usable Output Current | ±5 mA |
| 3 dB Bandwidth | 15 kHz |
| Alarm Output | TTL drive capability |
Key Features
- Cold junction compensation and amplification in a single IC package.
- Precalibrated for type K thermocouples with options for recalibration for other thermocouple types.
- Thermocouple failure alarm with flexible output format, including TTL drive capability.
- Pin-strapping options for use as a linear amplifier-compensator or as a switched output setpoint controller.
- Low self-heating with a total supply current of 160 µA (unloaded) and capable of delivering ±5 mA to a load.
- Available in two performance grades: C and A versions with calibration accuracies of ±1°C and ±3°C, respectively.
Applications
The AD595AQ is suitable for a variety of temperature measurement and control applications, including industrial process control, medical devices, and automotive systems. It is particularly useful in environments where precise temperature measurement and cold junction compensation are critical.
Q & A
- What type of thermocouple is the AD595AQ precalibrated for?
The AD595AQ is precalibrated for type K (chromel-alumel) thermocouples. - What is the output voltage of the AD595AQ per degree Celsius?
The output voltage is 10 mV/°C. - What are the supply voltage options for the AD595AQ?
The device can be powered from a single-ended supply (including +5 V) or a dual supply with +VS to –VS ≤ 30 V. - What is the operating temperature range of the AD595AQ?
The operating temperature range is from 0°C to +50°C. - How accurate is the calibration of the AD595AQ?
The calibration accuracy is ±1°C for the C version and ±3°C for the A version. - What types of packages are available for the AD595AQ?
The device is available in 14-pin, hermetically sealed, side-brazed ceramic DIPs and low-cost cerdip packages. - What is the quiescent current of the AD595AQ?
The quiescent current is 160 µA (no load). - What is the usable output current of the AD595AQ?
The usable output current is ±5 mA. - Does the AD595AQ have a thermocouple failure alarm?
Yes, it includes a thermocouple failure alarm with TTL drive capability. - Can the AD595AQ be used as a setpoint controller?
Yes, it can be used as a switched output setpoint controller with either fixed or remote setpoint control.
