MAX490EESA+T

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Introduction

The MAX490EESA+T is a low power, multi-channel RS-485 transceiver for bidirectional data communication. It accepts logic inputs of 1.8V to 5.5V from a controller, converts them to level-shifted differential voltage outputs and inputs, and vice versa. The MAX490EESA+T is designed for data communication in noisy industrial environments, where voltage spikes on the data lines caused by inductive loads, EMI fields, and other sources can cause erroneous data transmissions. The MAX490EESA+T is ideal for use as an RS-485/RS-422 transceiver in general-purpose data communication applications and includes an auto-direction sensing control feature. This feature, combined with programmable slew rate control and variable output drive, allows the MAX490EESA+T to minimize reflections, thus ensuring reliable data transmission over long cables.

Application Field

The application field for the MAX490EESA+T can be broad. It can be used for general-purpose, synchronous data communication systems such as local and remote head-end systems, telephone central office equipment, computer peripherals, instrumentation systems, instrumentation, multifunction controllers and other applications requiring 2-wire and 4-wire RS-485/RS-422 operation. It can also be used in industrial control networks, measuring and monitoring systems, security systems, and PLCs. In addition, the MAX490EESA+T is suitable for automotive and medical applications.

Working Principle

The MAX490EESA+T transceiver is based on the familiar twisted-pair, two-wire format, which allows bidirectional data transmission over a single line while maintaining noise immunity. This transceiver converts single-ended logic signals, such as those provided by a microcontroller, into a differential signal suitable for the RS-485 physical layer.The MAX490EESA+T is equipped with receivers and differential drivers that are capable of delivering specified performance levels when operated over a wide range of common-mode voltages and signal data rates up to 510 Kbps.The device provides two differential receiver inputs, A and B, that detect low-level signals sent from a transmitter. The device also contains two differential driver outputs, A and B, that provide full-speed operation up to 6 Mbps. The driver outputs are fully differential for minimizing reflections and maximizing signal integrity.

Conclusion

The MAX490EESA+T is an ideal choice for applications requiring high-speed, reliable transmission over long-distance point-to-point or multi-drop networks. With up to 6 Mbps speed and the ability to support multiple level-shifted outputs and inputs, the MAX490EESA+T transceiver can provide reliable communication in a wide variety of networking applications. For applications that require more robust noise immunity, the MAX490EESA+T includes programmable slew rate control and optional input protection up to 35V.

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