ADM1485ARMZ-REEL7

Overview

The ADM1485ARMZ-REEL7 is a 5 V low power EIA RS-485 transceiver fabricated on BiCMOS technology. It supports data rates up to 30 Mbps with driver propagation delay of 10 ns and receiver propagation delay of 15 ns. The device operates from a single 5 V supply (4.75 V to 5.25 V) and features a bus common-mode range of –7 V to +12 V. It includes thermal shutdown protection, short-circuit protection, and high-Z outputs when powered off. The component is housed in an 8-lead MSOP package and functions within the industrial temperature range of –40°C to +85°C.

Feature Summary

• High-speed bidirectional data communication capability compliant with RS-485 and RS-422 standards.
• Integrated thermal shutdown circuitry that disables driver outputs during excessive power dissipation or fault conditions.
• Fail-safe receiver feature ensuring a logic high output state when inputs are unconnected or floating.
• High output impedance when disabled or powered down to minimize bus loading effects.

Applications

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

Procurement Notes

Verify the specific ordering suffix against official documentation to confirm package type and reel specifications. Ensure compatibility with required temperature ranges and RoHS compliance status before integration into production designs.

Selection Notes

Select this component for applications requiring high-speed differential transmission over multipoint buses. Consider the 30 Mbps rate and 5 V supply requirements. Verify that the system design accommodates the extended common-mode voltage range and utilizes twisted pair cabling for optimal noise immunity.

Part Context

This part belongs to the ADM1485 series of RS-485 transceivers manufactured by Analog Devices Inc. It serves as a superior upgrade alternative to the LTC1485 model. The series provides robust interface solutions for balanced data transmission in noisy environments.

Replacement Considerations

The datasheet identifies the ADM1485 as a direct superior upgrade for the LTC1485. No other specific substitute part numbers are documented in the provided source material.

FAQ

What is the fail-safe feature of the ADM1485?

The receiver includes a fail-safe feature that guarantees a logic high output state if the inputs are open circuit or floating.

How does the thermal shutdown protection work?

Thermal sensing circuitry detects die temperature increases during fault conditions and disables the driver outputs at 150°C, re-enabling them at 140°C as the device cools.

What is the maximum number of transceivers supported on a bus?

Up to 32 transceivers may be connected simultaneously on a bus, though only one driver should be enabled at any time.