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ADM211EARU

ADM211EARU Description

The ADM211EARU 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 TSSOP package, this surface-mount IC integrates 4 drivers and 5 receivers, supporting data rates up to 120 kbps with a wide supply voltage range of 4.5V to 5.5V. Though now obsolete, it remains a reliable choice for legacy systems requiring high noise immunity, thanks to its 650 mV receiver hysteresis. Compliant with RS-232 protocols, it features EAR99 export control classification and MSL 1 (Unlimited) moisture sensitivity, ensuring ease of handling and integration.

ADM211EARU Features

• High Integration: Combines 4 drivers and 5 receivers in a compact 28TSSOP package, reducing board space.
• Robust Communication: 650 mV hysteresis enhances noise rejection in electrically noisy environments.
• Wide Voltage Range: Operates from 4.5V to 5.5V, compatible with standard 5V logic systems.
• Full-Duplex Operation: Enables simultaneous bidirectional data transmission (Tx/Rx).
• Legacy Reliability: Despite obsolescence, it offers proven performance for RS-232 applications.
• Low-Power Design: Optimized for energy-efficient operation in industrial and embedded systems.

ADM211EARU Applications

• Industrial Automation: Ideal for PLCs, motor controllers, and factory equipment requiring noise-resistant serial communication.
• Embedded Systems: Used in legacy medical devices, test instruments, and point-of-sale terminals.
• Telecom Infrastructure: Supports modem interfaces and base station control links.
• Retrofit Projects: Suitable for upgrading older RS-232 systems without redesigning power supplies.

Conclusion of ADM211EARU

The ADM211EARU is a highly integrated, noise-immune RS-232 transceiver tailored for demanding environments. Its full-duplex operation, wide voltage tolerance, and robust hysteresis make it a standout for legacy industrial and embedded applications. While newer alternatives exist, its proven reliability ensures continued relevance in systems where RS-232 remains the standard. Engineers seeking a compact, high-performance transceiver for noise-prone setups will find this IC a pragmatic solution.