Analog Devices Inc. ADM2481BRWZ

The ADM2481BRWZ from Analog Devices Inc. is a highly integrated digital isolator designed for use in RS-422 and RS-485 communication systems. This device combines a 3-channel isolator, a three-state differential line driver, and a differential receiver, making it an ideal solution for applications requiring reliable and isolated communication.

The ADM2481BRWZ is powered by either a 5 V or 3 V supply and features a slew-limited driver to reduce reflections on improperly terminated transmission lines, limiting the data rate to 500 kbps. It is fully specified over the industrial temperature range of −40°C to +85°C and is available in a 16-lead, wide body SOIC package.

• Isolation and Safety: The ADM2481BRWZ provides 2500 Vrms isolation voltage and 25 kV/µs common mode transient immunity, ensuring safe and reliable operation in harsh environments.
• Driver and Receiver: The device includes a three-state differential line driver and a differential receiver, both of which can be enabled or disabled via active-high and active-low inputs, respectively.
• Slew-Limited Driver: The driver is slew-limited to reduce reflections on improperly terminated transmission lines, limiting the data rate to 500 kbps.
• Fail-Safe Receiver Inputs: The receiver inputs have a true fail-safe feature, ensuring a logic-high receiver output level when the inputs are open or shorted.
• Thermal Shutdown and Current Limiting: The device features thermal shutdown and current limiting to protect against output short circuits and bus contention situations.

• Industrial Automation: Suitable for use in industrial control systems, motor control, and other automation applications where reliable and isolated communication is crucial.
• Medical Devices: Can be used in medical devices that require isolated communication to ensure patient safety and compliance with medical standards.
• Transportation Systems: Applicable in transportation systems, including automotive and aerospace, where robust and isolated communication is necessary.
• Building Automation: Useful in building automation systems for controlling and monitoring various building functions.

1. What is the maximum data rate supported by the ADM2481BRWZ?

   The ADM2481BRWZ supports a maximum data rate of up to 500 kbps due to its slew-limited driver.

2. What are the supply voltage options for the ADM2481BRWZ?

   The device can be powered with either a 3 V or 5 V supply.

3. What is the input impedance of the ADM2481BRWZ?

   The input impedance of the device is 96 kΩ, allowing up to 256 transceivers on the bus.

4. Does the ADM2481BRWZ have any protection features against short circuits?

   Yes, the device features thermal shutdown and current limiting to protect against output short circuits and bus contention situations.

5. What is the temperature range over which the ADM2481BRWZ is fully specified?

   The device is fully specified over the industrial temperature range of −40°C to +85°C.

6. What type of package is the ADM2481BRWZ available in?

   The ADM2481BRWZ is available in a 16-lead, wide body SOIC package.

7. What is the insulation voltage rating of the ADM2481BRWZ?

   The device has an insulation voltage rating of 2500 Vrms.

8. Does the ADM2481BRWZ have fail-safe receiver inputs?

   Yes, the receiver inputs have a true fail-safe feature that ensures a logic-high receiver output level when the inputs are open or shorted.

9. How does the slew-limited driver affect the transmission lines?

   The slew-limited driver reduces reflections on improperly terminated transmission lines, ensuring more reliable communication.

10. Can the driver and receiver be enabled or disabled?

    Yes, the driver and receiver can be enabled or disabled via active-high and active-low inputs, respectively.