ADM1485ARM

Overview

The ADM1485ARMZ is a high-speed, low-power EIA RS-485 transceiver fabricated using BiCMOS technology. It operates from a single 5 V supply and supports data rates up to 30 Mbps. The device features a driver propagation delay of 10 ns and a receiver propagation delay of 15 ns. It provides a bus common-mode range from –7 V to +12 V and includes thermal shutdown and short-circuit protection. The component is available in an 8-lead MSOP package and functions within the industrial temperature range of –40°C to +85°C.

Feature Summary

• High-speed BiCMOS fabrication for fast switching with minimal skew
• Integrated thermal shutdown circuitry prevents damage during fault conditions
• Fail-safe receiver design ensures logic high output when inputs are floating
• High-impedance outputs minimize bus loading when disabled or powered down

Applications

• Low power RS-485 systems
• DTE-DCE interface connections
• Packet switching networks
• Local area networks (LAN)
• Data concentration and multiplexing

Procurement Notes

Verify the specific ordering suffix to confirm the required package type and temperature rating. The 'ARMZ' designation indicates an 8-lead MSOP package with RoHS compliance. Confirm that the industrial grade version meets the operational temperature requirements for the intended environment before finalizing procurement.

Selection Notes

Select this component for applications requiring bidirectional data communication on multipoint buses. Ensure the system design accommodates the single 5 V supply requirement. Verify that the bus topology allows only one driver to be enabled at any given time to prevent contention. Consider the thermal characteristics if multiple devices operate simultaneously under heavy load.

Part Context

The ADM1485 is part of Analog Devices' RS-485 interface family, designed as a superior upgrade for older LTC1485 components. It complies with both RS-485 and RS-422 standards. The device integrates a differential line driver and receiver, allowing independent enablement of each function for flexible system control.

Replacement Considerations

The ADM1486ARZ serves as a compatible alternative within the same product family. Both devices support 30 Mbps data rates and 5 V operation. Selection between them should focus on package availability and specific form factor requirements rather than functional differences.