Overview
The AD595CD, 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 designed for use with type K (chromel-alumel) thermocouples. It combines an ice point reference with a precalibrated amplifier to produce a high-level output (10 mV/°C) directly from the thermocouple signal. The AD595CD is versatile, allowing it to be used either as a linear amplifier-compensator or as a switched output setpoint controller with fixed or remote setpoint control. It is also capable of converting the compensation voltage directly into a stand-alone Celsius transducer with a low impedance voltage output.
Key Specifications
| Parameter | Min | Typ | Max | Units |
|---|---|---|---|---|
| Supply Voltage Range | +5 V to +30 V | V | ||
| Common-Mode Input Voltage | -VS - 0.15 | +VS - 0.15 | V | |
| Differential Input Voltage | -VS | +VS | V | |
| Operating Temperature Range | -55 | +125 | °C | |
| Calibration Error at +25°C | ±1 | °C | ||
| Stability vs. Temperature | ±0.025 | °C | ||
| Usable Output Current | ±5 | mA | ||
| 3 dB Bandwidth | 15 | kHz | ||
| Quiescent Current (No Load) | 160 | 300 | µA |
Key Features
- Precalibrated for type K (chromel-alumel) thermocouples, with the ability to be used with type T thermocouple inputs as well.
- Low impedance voltage output: 10 mV/°C.
- Flexible pinout allows operation as a setpoint controller or a stand-alone temperature transducer calibrated in degrees Celsius.
- Low quiescent current and wide supply voltage range (+5 V to dual supplies spanning 30 V) for remote application sites.
- Differential input rejects common-mode noise voltage on the thermocouple leads.
- Thermocouple failure alarm indicates if one or both thermocouple leads become open.
- Available in 14-pin, hermetically sealed, side-brazed ceramic DIPs and low-cost cerdip packages.
Applications
The AD595CD is suitable for various temperature measurement and control applications, including industrial process control, medical devices, automotive systems, and any scenario where precise temperature monitoring is required. Its ability to operate over a wide temperature range and its low power consumption make it ideal for remote and battery-powered applications.
Q & A
- What type of thermocouple is the AD595CD precalibrated for?
The AD595CD is precalibrated for type K (chromel-alumel) thermocouples. - What is the output voltage of the AD595CD per degree Celsius?
The output voltage is 10 mV/°C. - Can the AD595CD be used as a setpoint controller?
Yes, it can be used as a setpoint controller with fixed or remote setpoint control. - What is the typical quiescent current of the AD595CD?
The typical quiescent current is 160 µA. - What is the operating temperature range of the AD595CD?
The operating temperature range is from -55°C to +125°C. - Does the AD595CD have a thermocouple failure alarm?
Yes, it includes a thermocouple failure alarm that indicates if one or both thermocouple leads become open. - What are the available package types for the AD595CD?
It is available in 14-pin, hermetically sealed, side-brazed ceramic DIPs and low-cost cerdip packages. - Can the AD595CD be recalibrated for other thermocouple types?
Yes, it can be recalibrated for other thermocouple types by adding resistors. - What is the 3 dB bandwidth of the AD595CD?
The 3 dB bandwidth is 15 kHz. - What is the maximum usable output current of the AD595CD?
The maximum usable output current is ±5 mA.
