**ADM3490EARZ: A Comprehensive Guide to the 3V RS-485/RS-422 Transceiver**

The **ADM3490EARZ** from Analog Devices is a monolithic, low-power, 3.3V transceiver designed for bidirectional data communication on multipoint bus transmission lines, fully compliant with both the RS-485 and RS-422 standards. It serves as a critical interface component in industrial automation, building control, and telecommunications networks where **robust long-distance communication** is paramount.

This transceiver integrates a differential line driver and a differential line receiver onto a single chip. The driver and receiver are enabled by separate active-high enable pins, providing the user with **precise transmit and receive control**. A key feature of the ADM3490EARZ is its **slew-rate-limited driver**, which minimizes electromagnetic interference (EMI) and reduces reflections caused by improperly terminated cables, thus ensuring data integrity even at high speeds up to 12Mbps.

Operating from a single **3.3V power supply**, the device is ideal for low-power and battery-operated systems. It consumes only 300µA of supply current during operation and features a low-power shutdown mode that reduces consumption to just 0.1µA, making it exceptionally efficient. The device is designed for **robust performance in electrically harsh environments**. It includes enhanced ESD protection, with its pins rated to ±12kV (Human Body Model), safeguarding the IC and the system it resides in from electrostatic discharge events.

The ADM3490EARZ supports up to 32 unit loads on a single bus, a standard for RS-485 networks. Its receiver features a wide common-mode voltage range (-7V to +12V), allowing it to reject significant noise ground potential differences between nodes on the network. The device is offered in a compact 8-lead SOIC package, facilitating easy integration into space-constrained PCB designs.

ICGOODFIND: The ADM3490EARZ stands out as a highly reliable and efficient solution for 3.3V RS-485/RS-422 networks. Its combination of **low-power operation**, integrated protection features, and **slew rate control** for signal integrity makes it an excellent choice for designing robust industrial communication interfaces.

**Keywords:** RS-485 Transceiver, Low-Power, 3.3V Operation, Slew Rate Limited, ESD Protection.