Analog Devices Inc. AD590LF/883B

The AD590LF/883B, produced by Analog Devices Inc., is a 2-terminal integrated circuit temperature transducer. This device generates an output current that is proportional to absolute temperature. It operates within a wide power supply range of 4 V to 30 V and is calibrated to produce 298.2 μA at 25°C (298.2 K) through laser trimming of the chip’s thin-film resistors. The AD590LF/883B is designed for temperature-sensing applications below 150°C and is an attractive alternative to conventional electrical temperature sensors due to its low cost, high accuracy, and the elimination of support circuitry.

• High Impedance Output: The AD590LF/883B has a high output impedance (>10 MΩ), which provides excellent rejection of supply voltage drift and makes it suitable for remote sensing applications.
• Low Power Requirements: The device operates with low power requirements, consuming 1.5 mW at 5 V and 25°C.
• Electrical Durability: It can withstand a forward voltage of up to 44 V and a reverse voltage of 20 V, ensuring it is not damaged by supply irregularities or pin reversal.
• No External Circuitry Needed: The AD590LF/883B does not require linearization circuitry, precision voltage amplifiers, resistance measuring circuitry, or cold junction compensation, making it a straightforward solution for temperature measurement.
• Multiplexing Capability: The current output can be easily switched by a CMOS multiplexer or by switching the supply voltage with a logic gate output.

• Temperature Measurement: The AD590LF/883B is ideal for any temperature-sensing application below 150°C, replacing conventional electrical temperature sensors.
• Temperature Compensation and Correction: It can be used for temperature compensation or correction of discrete components and for biasing proportional to absolute temperature.
• Flow Rate Measurement and Level Detection: The device is suitable for measuring flow rates and detecting fluid levels, as well as in anemometry applications.
• Remote Sensing: Its high impedance current output makes it particularly useful in remote sensing applications, where it can operate hundreds of feet away from the receiving circuitry).
• Hybrid Circuits: Available in die form, the AD590LF/883B is suitable for hybrid circuits and fast temperature measurements in protected environments).

1. What is the operating voltage range of the AD590LF/883B?

   The AD590LF/883B operates within a voltage range of 4 V to 30 V.

2. What is the nominal current output 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 AD590LF/883B?

   The nominal temperature coefficient is 1 μA/K.

4. Does the AD590LF/883B require external circuitry for temperature measurement?

   No, the AD590LF/883B does not require linearization circuitry, precision voltage amplifiers, resistance measuring circuitry, or cold junction compensation.

5. How durable is the AD590LF/883B in terms of voltage handling?

   The device can withstand a forward voltage of up to 44 V and a reverse voltage of 20 V.

6. What are the typical applications of the AD590LF/883B?

   Typical applications include temperature measurement, temperature compensation, flow rate measurement, level detection, and remote sensing.

7. Can the AD590LF/883B be used in remote sensing applications?

   Yes, the high impedance current output makes it suitable for remote sensing applications, allowing it to operate hundreds of feet away from the receiving circuitry.

8. What is the minimum operating temperature of the AD590LF/883B?

   The minimum operating temperature is -55°C.

9. Is the AD590LF/883B available in different package types?

   Yes, it is available in various packages including 2-lead FLATPACK, 3-pin TO-52, 4-lead LFCSP, 8-lead SOIC, and die form.

10. How does the AD590LF/883B handle supply voltage drift?

    The high output impedance (>10 MΩ) provides excellent rejection of supply voltage drift, resulting in minimal current change with voltage variations.