Analog Devices Inc. AD590LH

The AD590LH, produced by Analog Devices Inc., is a 2-terminal integrated circuit temperature transducer designed to produce an output current proportional to absolute temperature. This device operates within a wide temperature range of -55°C to +150°C, making it suitable for various temperature-sensing applications where conventional electrical temperature sensors are used. The AD590LH is characterized by its high impedance, constant current output, and the elimination of the need for support circuitry such as linearization circuitry, precision voltage amplifiers, and cold junction compensation.

• Linear Current Output: 1 μA/K, making it highly linear over the entire temperature range.
• Wide Temperature Range: Operates from -55°C to +150°C, suitable for a variety of applications.
• Two-Terminal Device: Simple voltage in and current out configuration, reducing the need for additional circuitry.
• Wide Power Supply Range: Can operate with supply voltages between 4 V and 30 V.
• Sensor Isolation From Case: Ensures that the sensor is electrically isolated from the case, enhancing reliability.
• High Output Impedance: Greater than 10 MΩ, providing excellent rejection of supply voltage drift.
• Low Power Requirements: Consumes only 1.5 mW at 5 V and 25°C, making it energy-efficient).
• Electrical Durability: Withstands forward voltages up to 44 V and reverse voltages up to 20 V, ensuring robustness against supply irregularities).

• Temperature Measurement: Ideal for any temperature-sensing application below 150°C, replacing conventional electrical temperature sensors).
• Remote Sensing: Suitable for remote sensing due to its high-impedance current output, which is insensitive to voltage drops over long lines).
• Temperature Compensation and Correction: Used for temperature compensation or correction of discrete components and biasing proportional to absolute temperature).
• Flow Rate Measurement and Level Detection: Can be used in applications such as flow rate measurement, level detection of fluids, and anemometry).
• Hybrid Circuits: Available in die form, making it suitable for hybrid circuits and fast temperature measurements in protected environments).

1. What is the temperature range of the AD590LH?

   The AD590LH operates within a temperature range of -55°C to +150°C).

2. What is the output current of the AD590LH at 25°C?

   The nominal current output at 25°C (298.2 K) is 298.2 μA).

3. What is the temperature coefficient of the AD590LH?

   The nominal temperature coefficient is 1 μA/K).

4. What is the calibration error of the AD590LH at 25°C?

   The calibration error at 25°C is ±1.0°C for the AD590L and ±0.5°C for the AD590M).

5. How does the AD590LH handle supply voltage drift?

   The high output impedance (>10 MΩ) provides excellent rejection of supply voltage drift, with a maximum current change of 1 μA (equivalent to 1°C error) when the power supply changes from 5 V to 10 V).

6. Is the AD590LH suitable for remote sensing applications?

   Yes, the AD590LH is particularly useful in remote sensing applications due to its high-impedance current output, which is insensitive to voltage drops over long lines).

7. What are the power requirements of the AD590LH?

   The AD590LH consumes only 1.5 mW at 5 V and 25°C).

8. How durable is the AD590LH against electrical stress?

   The AD590LH can withstand forward voltages up to 44 V and reverse voltages up to 20 V, ensuring robustness against supply irregularities).

9. What are some common applications of the AD590LH?

   Common applications include temperature measurement, remote sensing, temperature compensation, flow rate measurement, and level detection of fluids).

10. Is the AD590LH available in different package types?

    Yes, the AD590LH is available in various package types, including 2-lead FLATPACK, 3-pin TO-52, 8-lead SOIC, and die form).