AD590LF

The AD590LF is a 2-terminal integrated circuit temperature transducer manufactured by Analog Devices. It operates as a high impedance, constant current regulator, producing an output current of 1 μA/K. This device is designed for temperature sensing applications within a wide range of -55°C to +150°C. Its output current is proportional to absolute temperature, simplifying temperature measurement without the need for linearization circuitry or precision voltage amplifiers.

The AD590LF is suitable for various applications, including temperature compensation, flow rate measurement, and fluid level detection. Its high impedance current output makes it insensitive to voltage drops over long lines, making it ideal for remote sensing applications. The device is available in multiple package forms, including TO-52, which is a 3-pin package suitable for through-hole mounting.

Key electrical characteristics include a wide power supply range from 4 V to 30 V. While specific calibration accuracy and linearity figures are noted for the AD590M variant (±0.5°C and ±0.3°C respectively), the general principle of laser trimming for calibration is a feature of the AD590 series. The device's design eliminates the need for extensive support circuitry, offering a cost-effective solution for temperature measurement.