Overview
The AD8497ARMZ-R7, 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 calibrated to match the characteristics of K-type (chromel-alumel) thermocouples. It offers a high-level output of 5 mV/°C directly from the thermocouple signal, combining an ice point reference with a precalibrated amplifier. The AD8497ARMZ-R7 can operate as a standalone thermometer or as a switched output setpoint controller, making it versatile for various temperature measurement applications.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Supply Voltage Range | 2.7 V to 36 V | V |
| Output Voltage Range | -VS + 0.025 to +VS - 0.1 | V |
| Input Voltage Range | -VS - 0.2 to +VS - 1.6 | V |
| Overvoltage Range | +VS - 25 to -VS + 25 | V |
| Input Bias Current | 25 to 50 | nA |
| Input Offset Current | 1.5 to 0.5 | nA |
| Common-Mode Rejection | 1 to 0.3 | °C/V |
| Power Supply Rejection | 0.5 | °C/V |
| Output Short-Circuit Current | 7 | mA |
| -3 dB Bandwidth | 25 kHz | kHz |
| Settling Time to 0.1% | 40 μs | 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 VS ± 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.
- Capable of delivering in excess of ±5 mA to a load while minimizing self-heating with a total supply current of 180 μA when unloaded.
Applications
- Temperature measurement in industrial systems.
- Thermocouple-based temperature sensing in various environments.
- Setpoint control in temperature regulation systems.
- Integration with lower supply ADCs in embedded systems.
- Use in systems requiring a wide common-mode input range.
Q & A
- What type of thermocouple does the AD8497ARMZ-R7 support?
The AD8497ARMZ-R7 is calibrated to match the characteristics of K-type (chromel-alumel) thermocouples.
- What is the output voltage range of the AD8497ARMZ-R7?
The output voltage range is from -VS + 0.025 to +VS - 0.1 volts.
- What is the supply voltage range for the AD8497ARMZ-R7?
The supply voltage range is from 2.7 V to 36 V.
- How does the AD8497ARMZ-R7 protect against overvoltage?
The device provides overvoltage protection (OVP) up to VS ± 25 V.
- What is the common-mode rejection ratio of the AD8497ARMZ-R7?
The common-mode rejection ratio is 1 to 0.3 °C/V.
- What is the bandwidth of the AD8497ARMZ-R7?
The -3 dB bandwidth is 25 kHz.
- How long does it take for the AD8497ARMZ-R7 to settle to 0.1% of the output step?
The settling time to 0.1% is 40 μs.
- Is the AD8497ARMZ-R7 RoHS compliant?
Yes, the device is fully RoHS compliant.
- What is the typical supply current of the AD8497ARMZ-R7 when unloaded?
The typical supply current when unloaded is 180 μA.
- Can the AD8497ARMZ-R7 be used as a setpoint controller?
Yes, the device can be used as a setpoint controller or as a standalone Celsius thermometer.
