Overview
The AD8494ARMZ-R7, produced by Analog Devices Inc., is a precision instrumentation amplifier with a thermocouple cold junction compensator integrated into a single IC package. This device is specifically designed to work with J-type (iron-constantan) thermocouples, providing a high-level output of 5 mV/°C directly from the thermocouple signal. It combines an ice point reference with a precalibrated amplifier, making it suitable for use as a standalone thermometer or as a switched output setpoint controller.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Supply Voltage Range | 2.7 to 36 | V |
| Output Voltage per °C | 5 | mV/°C |
| Input Voltage Range | −VS − 0.2 to +VS − 1.6 | V |
| Overvoltage Range | ±25 | V |
| Input Bias Current | 25 to 50 | nA |
| Common-Mode Rejection Ratio | 1 to 0.3 | °C/V |
| Power Supply Rejection | 0.5 | °C/V |
| Output Voltage Range | −VS + 0.025 to +VS − 0.1 | V |
| Short-Circuit Current | 7 | mA |
| Bandwidth | 30 | kHz |
| Settling Time to 0.1% | 36 | μs |
Key Features
- Complete, precision laser wafer trimmed thermocouple signal conditioning system in a single IC package.
- Flexible pinout allows operation as a setpoint controller or as a standalone Celsius thermometer.
- Rugged inputs withstand 4 kV ESD and provide overvoltage protection (OVP) up to ±25 V.
- Differential inputs reject common-mode noise on the thermocouple leads.
- Reference pin voltage can be offset to measure 0°C on single supplies.
- Available in a small, 8-lead MSOP package that is fully RoHS compliant.
Applications
The AD8494ARMZ-R7 is suitable for various applications, including industrial temperature measurement, process control, and automotive systems. It can be used in environments requiring high accuracy and reliability, such as in the measurement of temperatures in industrial processes, HVAC systems, and automotive engine monitoring.
Q & A
- What type of thermocouple does the AD8494ARMZ-R7 support? The AD8494ARMZ-R7 is precalibrated to match the characteristics of J-type (iron-constantan) thermocouples.
- What is the output voltage per °C for the AD8494ARMZ-R7? The output voltage per °C is 5 mV/°C.
- What is the supply voltage range for the AD8494ARMZ-R7? The supply voltage range is from 2.7 V to 36 V.
- How does the AD8494ARMZ-R7 protect against overvoltage? The device provides overvoltage protection (OVP) up to ±25 V.
- What is the common-mode rejection ratio of the AD8494ARMZ-R7? The common-mode rejection ratio is 1 to 0.3 °C/V.
- What is the bandwidth of the AD8494ARMZ-R7? The bandwidth is 30 kHz.
- How long does it take for the AD8494ARMZ-R7 to settle to 0.1% of the final output voltage? The settling time to 0.1% is 36 μs.
- Is the AD8494ARMZ-R7 RoHS compliant? Yes, the device is fully RoHS compliant.
- What package type is the AD8494ARMZ-R7 available in? The device is available in an 8-lead MSOP package.
- Can the AD8494ARMZ-R7 be used as a standalone thermometer or a setpoint controller? Yes, it can be used in both configurations.
