ADI AD8494ARMZ

AD8494/AD8495/AD8496/AD8497 are precision instrumentation amplifiers with integrated thermocouple cold junction compensators. The combination of an ice point reference and a pre-calibrated amplifier enables high-level <5mV/°C> output directly from thermocouple signals. These devices can be used as standalone thermometers or as switch-output setpoint controllers with fixed or remote setpoint control. The AD8494/AD8495/AD8496/AD8497 operate from a single supply as low as 3V; temperatures below 0°C can be measured by biasing the reference input. To minimize self-heating, the total supply current of the unloaded AD849x is typically 180μA, yet the devices can source or sink more than ±5mA to a load. The AD8494 and AD8496 are laser wafer trimmed and pre-calibrated to match the characteristics of Type J (iron-constantan) thermocouples; the AD8495 and AD8497 are laser trimmed to match the characteristics of Type K (chromel-alumel) thermocouples. The AD8494/AD8495/AD8496/AD8497 support a wide supply voltage range. With a 5V single supply, the 5mV/°C output allows these devices to cover nearly 1000 degrees of thermocouple temperature range. At 3V supply, the AD8494/AD8495/AD8496/AD8497 can interface directly with low supply voltage ADCs. These devices can also operate from supplies up to 36V, supporting industrial systems that require a wide common-mode input range.

• Complete, precision laser wafer-trimmed thermocouple signal conditioning system in a single IC package.
• Flexible pin assignment allows use as a setpoint controller or standalone Celsius thermometer.
• Ruggedized inputs withstand 4kV ESD with OVP up to Vs±25V.
• Differential inputs reject common-mode noise on thermocouple leads.
• Single-supply operation with biasable reference pin for 0°C measurement.
• 8-pin MSOP package, fully RoHS compliant.

• J or K type thermocouple temperature measurement
• Setpoint controller
• Celsius thermometer
• Universal cold junction compensator
• White goods (oven, stove) temperature measurement
• Exhaust gas temperature detection
• Catalytic converter temperature detection