MAX3485CPA+

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The MAX3485CPA+ is a highly integrated enhanced RS-485 transceiver as part of the MAX3485 family. This transceiver is designed to meet the demanding requirements of multi-drop and data-transmission applications on a single unshielded twisted-pair (UTP) line up to 250kbps. Its range of features enables it to perform satisfactorily in a variety of networks which require balanced data transmission.

The MAX3485CPA+ is designed for improved signal integrity and electromagnetic interference (EMI) immunity, including:

• Improved slew rate control to reduce EMI
• Adjustable driver output level (including parallel/BIAS)
• Enhanced reject noise rejection (15nV/Å typical) and
• Precise Receiver Input Levels (10mV typical)

The MAX3485CPA+ is suitable for applications including:

• Consumer electronics
• Industrial automation
• Building automation
• Real-time distributed control
• Data-acquisition systems
• Networked computers

It has an integrated three-state bus buffer, which prevents bus contention while allowing flexibility in the design of the system. Its two-state receiver input enables high signal integrity and noise immunity in high data rate applications. Tuning of the receive signal level can be achieved with the adjustable receiver threshold. The receiver output can be suspended via the active input signal EN signal.

The MAX3485CPA+ has a powerful integrated driver control and switch mode control logic. The driver is inverted and the detents are factory set for performance optimization. The output power can be adjusted with respect to the maximum adjustable driver output level. The driver is capable of switching voltage levels and provides an adjustable slew rate control.

The MAX3485CPA+has a low-power shutdown mode, with an active current of only 12mA, optimally consuming normal operating power levels of 250mA. The acceptability criterion of no more than 15nV/Å noise on the receiver input allows the MAX3485CPA+ to receive data reliably in noisy environments. It is also capable of operation in temperatures ranging from -40°C to 85°C.

The MAX3485CPA+ is a versatile, reliable device that is suitable for a variety of RS-485 applications. It is a highly integrated transceiver which is easily configured, and supports true differential data transmission with integrated a three-state bus buffer and adjustable driver output. The robust design of the device allows it to work in a variety of environments and temperatures. It is a reliable, cost-effective choice for RS-485 applications.

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