MAX489EESD

Interface - Drivers, Receivers, Transceivers

The MAX489EESD is a low-cost, low-power, small size and popular transceiver. This device is designed to be a 3-state differential line transmitter and receiver, allowing superior noise rejection in noisy industrial and consumer applications such as LCD displays, remote sensors and FAX systems.

The MAX489EESD is suitable for use in various data communication applications, including CAN bus systems that require high-speed, low-power by communication interface standards. This device can be used in digital and analog applications, where it is responsible for bidirectional signal conversion process.

The MAX489EESD is built around the latest-generation deep submicron voltage-level shifter technology. The transceiver utilize a low-voltage, low-power signal logic coupled with high-speed digital processing to improve signal integrity. A signal-processing circuit allows for efficient differential line driving and rapid signal detection.

Application Field

This device is well-suited for a variety of different interfaces, including the CAN bus, VMEbus, PCIExpress, Ethernet, FireWire and ATA. The MAX489EESD is also suitable for in-system debugging and communication between different types of microcontrollers. Furthermore, this device can be used in communication systems where synchronization accuracy is critically important.

The MAX489EESD is particularly effective for the data-acquisition systems, namely the measurement of different physical phenomena. The device can be used to transmit information from multiple sensors to a data monitoring system or other control system. The device also enables data collection from digital logic, amplifier, and motor controllers. In addition, the device is designed to be convenient and straightforward to use, owing to its plug-and-play feature that allows for easy connection.

Another widespread application field of the MAX489EESD is the industrial process control systems. This device ensures fast switching times and the simultaneous transmission of analog and digital signals, making it the best choice for these systems. It can also be used to control multiple motor drives, allowing motor drives to communicate with the rest of the process control system.

Working Principle

The working principle of the MAX489EESD device is based on the voltage-level shifter technology, which enables the transceiver to efficiently transmit and receive signals that meet both electrical and electromechanical requirements. The transceiver is a dual-channel system, with two channels A and B having independent differential lines. The channels operate independently, with their own mode of operation. Channel A is used for the device’s transmission of a serial data stream, while channel B is used for the device’s reception of a serial data stream.

On the device’s transmission side, channel A accepts a digital signal with a voltage level between 0–3.6 volts. It modulates this digital signal into a differential line. The combined signals then travel over the main differential line, towards the receiving part of the device. This part of the device is known as channel B. Channel B is designed to detect when the incoming signal crosses the field-effect threshold level, informs the logic control circuitry of the voltage level, and then converts the incoming signal into a digital word.

The device also utilizes a termination technique known as the source-termination technique. In this technique, a resistor is installed at the end of both the transmitting and receiving lines. This resistor matches the impedance of the line, ensuring a reflection-free and optimum speed of operations. The MAX489EESD also supplies protection from short circuits, power over-voltage or under-voltage, voltage mismatches and erroneous ground connections.