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AD8497CRMZ-R7

Precision K-type thermocouple amplifier with cold junction compensation, 5mV/°C output, 8-lead MSOP

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Pieza del fabricante：

AD8497CRMZ-R7

Paquete：

8-Lead MSOP (3.0 x 3.0 x 0.85 mm)

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Descripción

Productos

The AD8497CRMZ-R7 is an Analog Devices precision K-type thermocouple amplifier with integrated cold junction compensation. It produces a 5 mV/°C output directly from a thermocouple signal by combining an ice point reference with a precalibrated amplifier. The device operates from supply voltages of 2.7 V to 36 V (single) or ±2.7 V to ±18 V (dual), and is packaged in an 8-lead MSOP rated for -40°C to +125°C operation.

Especificaciones

Thermocouple Type K (Chromel-Alumel)
Output Sensitivity 5 mV/°C
Initial Accuracy 1.5°C max (at 25°C)
Tensión de alimentación 2.7 V to 36 V (single)
Corriente de reposo 180 µA (typical)
Input Overvoltage VS ± 25 V
ESD Rating 4.5 kV HBM
Paquete 8-Lead MSOP

Características

  • Pretrimmed for K-type thermocouple
  • Internal cold junction compensation
  • High impedance differential input
  • 5 mV/°C output (standalone thermometer)
  • Reference pin for offset adjustment
  • Thermocouple break detection
  • 1°C initial accuracy (laser trimmed)
  • 4 kV ESD protection
  • Input overvoltage protection to VS ± 25 V

Aplicaciones

  • K-type thermocouple temperature measurement
  • Setpoint controllers
  • Celsius thermometer
  • White goods (oven, stovetop) temperature
  • Exhaust gas temperature sensing
  • Catalytic converter temperature detection

The AD8497CRMZ-R7 is an Analog Devices precision thermocouple amplifier designed specifically for K-type (Chromel-Alumel) thermocouples. It integrates cold junction compensation and a precalibrated instrumentation amplifier to produce a 5 mV/°C output directly, eliminating the need for external compensation circuitry. The device can operate as a standalone Celsius thermometer or as a setpoint controller. It supports wide supply voltage range (2.7 V to 36 V single supply), features 4.5 kV ESD protection, and input overvoltage protection to VS ± 25 V. The 180 µA typical quiescent current suits battery-powered applications.

The AD8497 operates as a complete thermocouple signal conditioning system with three subsystems: (1) The cold junction compensation circuit integrates a temperature sensor at the reference junction to measure the local temperature and generate a compensating voltage that cancels the thermocouple error voltage at the cold junction. (2) The fixed-gain instrumentation amplifier amplifies the small thermocouple voltage (approximately 41 µV/°C for K-type) to produce a 5 mV/°C output. The high CMRR of the instrumentation amplifier rejects common-mode noise picked up by long thermocouple leads. (3) The reference pin (REF) allows offset adjustment for measuring below 0°C with single supply. The SENSE pin can be connected to the output (measurement mode) or a setpoint voltage (controller mode).

Pin Mnemonic Descripción
1 -IN Negative thermocouple input
2 REF Reference voltage input (for offset adjustment)
3 -VS Negative supply
4 NC Sin conexión
5 SENTIDO Sense pin (connect to OUT or setpoint)
6 OUT Amplifier output (5 mV/°C)
7 +VS Positive supply
8 +IN Positive thermocouple input
  • Industrial K-type thermocouple temperature measurement with 1°C accuracy
  • Oven and stovetop temperature control in white goods
  • Automotive exhaust gas and catalytic converter temperature monitoring
  • Setpoint controllers with integrated cold junction compensation
  • Standalone Celsius thermometer with direct 5 mV/°C output
Modelo Fabricante Diferencia clave
AD8495CRMZ-R7 ADI K-type, different input range
AD8494CRMZ-R7 ADI J-type thermocouple version
AD8496CRMZ-R7 ADI J-type, different input range
AD8497ARMZ-R7 ADI K-type, standard accuracy
MAX31855K Maxim SPI output K-type thermocouple IC
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