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ADM211AR

ADM211AR Description

The ADM211AR from Analog Devices Inc. is a full-duplex RS-232 transceiver designed for robust serial communication in industrial and embedded systems. Housed in a 28-pin SOIC package, this surface-mount IC integrates 4 drivers and 5 receivers, supporting data rates up to 120 kbps with a supply voltage range of 4.5V to 5.5V. Its 650 mV receiver hysteresis ensures noise immunity in electrically noisy environments, while compliance with RS-232 protocol guarantees compatibility with legacy systems. Though marked obsolete, it remains a reliable choice for maintenance or legacy designs due to its high ESD protection and low-power operation.

ADM211AR Features

• 4 Drivers/5 Receivers: Flexible configuration for multi-channel communication.
• Full-Duplex Operation: Simultaneous bidirectional data transmission.
• 650 mV Hysteresis: Enhanced noise rejection for stable signal integrity.
• Wide Supply Range (4.5V–5.5V): Compatible with standard 5V logic systems.
• 120 kbps Data Rate: Suitable for moderate-speed industrial telemetry and control.
• Surface-Mount (SOIC-28): Space-efficient for compact PCB designs.
• RS-232 Compliance: Ensures interoperability with legacy interfaces.

ADM211AR Applications

Ideal for:

• Industrial Automation: PLCs, motor controllers, and sensor interfaces requiring noise-immune communication.
• Embedded Systems: Legacy equipment upgrades or repairs where RS-232 remains critical.
• Telecom Infrastructure: Modems, routers, and base stations needing reliable serial links.
• Medical Devices: Patient monitoring systems with stringent signal integrity requirements.

Conclusion of ADM211AR

The ADM211AR excels in noise-prone environments with its high hysteresis and robust ESD protection, making it a dependable choice for industrial and legacy applications. While obsolete, its full-duplex capability, moderate data rate, and compatibility ensure continued utility in systems where RS-232 persists. Engineers seeking a proven, analog-optimized transceiver for maintenance or niche designs will find this IC a pragmatic solution.