Overview
The AD8494CRMZ, produced by Analog Devices Inc., is a precision instrumentation amplifier with thermocouple cold junction compensation integrated into a single IC package. This device is specifically designed to work with J-type (iron-constantan) thermocouples, providing a high-level output directly from the thermocouple signal. It combines an ice point reference with a precalibrated amplifier, allowing it to function as either a standalone thermometer or a setpoint controller. The AD8494CRMZ is known for its flexibility, operating with a wide range of supply voltages and offering robust features such as ESD protection and over-voltage protection.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Supply Voltage Range | 3 V to 36 V | V |
| Output Voltage Range | -VS + 0.025 to +VS - 0.1 | V |
| Gain | 5 mV/°C | mV/°C |
| Input Resistance | 60 kΩ | kΩ |
| Input Current | 25 μA | μA |
| Short-Circuit Current | ±7 mA | mA |
| -3 dB Bandwidth | 30 kHz | kHz |
| Settling Time to 0.1% | 36 μs | μs |
| Package Type | 8-Lead MSOP |
Key Features
- Precision Thermocouple Signal Conditioning: The AD8494CRMZ provides a complete, precision laser wafer trimmed thermocouple signal conditioning system in a single IC package.
- Flexible Operation: It can operate as a standalone Celsius thermometer or as a setpoint controller using either a fixed or remote setpoint control.
- Wide Supply Voltage Range: The device can work with supply voltages ranging from 3 V to 36 V, making it suitable for various applications.
- Robust Inputs: The inputs are rugged and can withstand 4 kV ESD and provide over-voltage protection up to VS ± 25 V.
- Differential Inputs: The device features differential inputs that reject common-mode noise on the thermocouple leads.
- Compact Package: Available in a small, 8-lead MSOP package that is fully RoHS compliant.
Applications
The AD8494CRMZ is versatile and can be used in a variety of applications, including:
- Industrial Temperature Measurement: Suitable for industrial systems that require precise temperature measurement over a wide range.
- Setpoint Controllers: Can be used as switched output setpoint controllers for temperature control in various industrial and automotive applications.
- Standalone Thermometers: Functions as a standalone thermometer, providing a direct output proportional to the temperature measured by the thermocouple).
Q & A
- What type of thermocouple does the AD8494CRMZ support?
The AD8494CRMZ is specifically designed to work with J-type (iron-constantan) thermocouples).
- What is the output voltage range of the AD8494CRMZ?
The output voltage range is from -VS + 0.025 to +VS - 0.1 volts).
- What is the gain of the AD8494CRMZ?
The gain is 5 mV/°C).
- What is the supply voltage range for the AD8494CRMZ?
The device can operate with supply voltages ranging from 3 V to 36 V).
- How does the AD8494CRMZ protect against ESD and over-voltage?
The device features 4 kV ESD protection and over-voltage protection up to VS ± 25 V).
- What package type is the AD8494CRMZ available in?
The device is available in an 8-lead MSOP package).
- Can the AD8494CRMZ be used as a setpoint controller?
- What is the typical settling time of the AD8494CRMZ?
The settling time to 0.1% is 36 μs).
- Is the AD8494CRMZ RoHS compliant?
- What is the input resistance of the AD8494CRMZ?
The input resistance is 60 kΩ).
