ADM1485ARZ

Overview

The ADM1485ARZ is a differential line transceiver designed for high-speed bidirectional data communication on multipoint bus transmission lines. It complies with RS-485 and RS-422 EIA standards, featuring one driver and one receiver within an 8-lead SOIC package. The device operates from a single 5 V supply and supports typical data rates of 30 Mbps. It provides a bus common-mode range from –7 V to +12 V. Key electrical parameters include a driver propagation delay of 10 ns and a receiver propagation delay of 15 ns. The component functions over an industrial temperature range of –40°C to +85°C.

Feature Summary

• Thermal shutdown protection prevents excessive power dissipation during fault conditions by disabling the driver output when internal temperatures exceed safe limits.
• Fail-safe receiver design ensures a logic high output state if the inputs are unconnected or floating, maintaining signal integrity in open-circuit scenarios.
• High output impedance is maintained when disabled or powered down, minimizing loading effects on the bus across the entire common-mode voltage range.

Applications

• Low Power RS-485 Systems
• DTE-DCE Interface
• Packet Switching
• Local Area Networks

Procurement Notes

Verify the specific ordering suffix against the manufacturer's official documentation to confirm the exact package type and temperature rating. Confirm RoHS compliance status as indicated in the ordering guide. Ensure that the procurement channel sources directly from authorized distributors to guarantee authenticity and traceability of the Analog Devices component.

Selection Notes

Select this component for applications requiring half-duplex communication on multipoint buses where low power consumption is critical. The ADM1485ARZ is suitable for environments needing extended common-mode voltage tolerance. Consider the thermal characteristics and package constraints when designing PCB layouts for heat dissipation and space optimization.

Part Context

The ADM1485ARZ belongs to the ADM1485 series of 5 V low-power EIA RS-485 transceivers manufactured by Analog Devices. This series utilizes BiCMOS technology to combine low power CMOS with fast switching bipolar capabilities. The ARZ variant specifically denotes the 8-lead SOIC_N package configuration compliant with RoHS standards.

Replacement Considerations

The LTC1485 is identified as a predecessor component with the ADM1485 serving as a superior upgrade. Verify pin compatibility and electrical specifications before substituting other RS-485 transceivers from different manufacturers.