RS-485/RS-422
Products (3)
ADM2587EBRWZ - 2.5kV Isolated RS-485 Transceiver | Analog Devices
The ADM2587EBRWZ from Analog Devices is a fully integrated signal and power isolated RS-485/RS-422 transceiver with ±15 kV ESD protection. It combines a 2-channel digital isolator, a 3-state differential line driver, and a differential input receiver into a single 20-lead wide-body SOIC package. The device operates from a single 5V or 3.3V supply and includes an integrated isolated DC-DC converter, eliminating the need for a separate isolated power supply. It supports data rates up to 500 kbps and provides 2.5 kVrms isolation with 25 kV/µs common-mode transient immunity (CMTI). The ADM2587E is suitable for high-speed communication on multipoint transmission lines and is fully specified over the industrial temperature range of -40°C to +85°C. An isolated RS-485 transceiver is a device that combines a differential bus transceiver with galvanic isolation, typically using magnetic or capacitive coupling, to protect the host system from ground loops, voltage spikes, and noise on the communication bus. It is a critical component in industrial automation, building control, and instrumentation systems where long cable runs and harsh electrical environments are common. The isolation barrier separates the logic side from the bus side, preventing dangerous voltages from reaching the microcontroller or other sensitive circuitry. Key features of the ADM2587EBRWZ include an integrated isolated DC-DC converter that provides a regulated output voltage for the bus side, eliminating the need for an external isolated power supply. The device offers full-duplex and half-duplex operation, with an active-high driver enable and an active-low receiver enable. It also features current limiting and thermal shutdown protection against output short circuits and bus contention. The ±15 kV ESD protection on the bus pins ensures robust operation in harsh industrial environments. The ADM2587E uses Analog Devices' isoPower technology, which employs high-frequency switching elements to transfer power across the isolation barrier through a transformer. This integrated approach reduces component count and board space compared to discrete isolation solutions. The device is available in a 20-lead wide-body SOIC package (RW-20), which provides excellent thermal performance and is compatible with standard surface-mount assembly processes. Typical applications include industrial fieldbus networks, building automation systems, HVAC controllers, and remote sensor interfaces. The ADM2587EBRWZ is ideal for systems requiring reliable data communication over long distances with galvanic isolation to protect against ground potential differences and electrical noise. When designing with the ADM2587EBRWZ, it is important to provide adequate decoupling on both the logic and bus-side power pins. The integrated DC-DC converter requires an external transformer and rectifier diodes, which must be placed close to the device to minimize parasitic inductance. Proper PCB layout is critical to achieve the specified CMTI and ESD performance.
ADM2587EBRWZ-REEL7 - Isolated RS-485 Transceiver | Analog Devices
The ADM2587EBRWZ-REEL7 from Analog Devices is a fully integrated signal and power isolated RS-485/RS-422 transceiver with ±15 kV ESD protection, designed for high-speed communication on multipoint transmission lines. It integrates an isoPower isolated DC-to-DC converter, eliminating the need for an external isolated power supply, and provides 2500 Vrms isolation between the logic side and the bus side. The device operates from a single 5 V or 3.3 V supply and supports data rates up to 500 kbps, making it suitable for industrial automation, building control, and instrumentation networks. An isolated RS-485 transceiver is a type of interface IC that combines a differential line driver and receiver with galvanic isolation, protecting the host system from ground loops, common-mode voltages, and electrical noise. It sits within the hierarchy of interface ICs, specifically under RS-485/RS-422 transceivers, which are part of the broader category of serial communication interfaces. The integrated DC-DC converter and signal isolation in a single package simplify PCB design and reduce board space compared to discrete isolation solutions. Key features include 2500 Vrms isolation, ±15 kV ESD protection on the RS-485 pins, high common-mode transient immunity of >25 kV/µs, and compliance with ANSI/TIA/EIA-485-A-98 and ISO 8482:1987(E). The device supports up to 256 nodes on one bus, has open- and short-circuit fail-safe receiver inputs, and includes thermal shutdown protection. The wide-body 20-lead SOIC package (0.295" width) is suitable for industrial temperature ranges. Technically, the ADM2587E uses Analog Devices' isoPower technology, which integrates a push-pull DC-DC converter with a transformer-based isolation barrier, providing isolated power and data in one chip. The transceiver features a full-duplex or half-duplex operation, with a driver enable pin and receiver enable pin for bus control. The high CMTI ensures reliable operation in noisy industrial environments where fast voltage transients occur. Typical applications include industrial fieldbus networks, building automation systems, HVAC controllers, and remote sensor data acquisition. The integrated isolation and power make it ideal for systems where ground potential differences exist between nodes, such as in motor drives and power inverters. When designing with this device, ensure proper PCB layout with adequate creepage and clearance distances for the isolation barrier, and place decoupling capacitors close to the VCC and VISO pins. The integrated DC-DC converter requires an external transformer and rectifier circuit, as specified in the datasheet, to generate the isolated supply voltage.
ST1480ACDR - 3.3V RS-485/RS-422 Transceiver | STMicroelectronics
The ST1480ACDR is a low-power, half-duplex RS-485/RS-422 transceiver from STMicroelectronics, designed for balanced data transmission in industrial and instrumentation applications. It operates from a single 3.3V supply and supports data rates up to 12 Mbps, making it suitable for high-speed communication networks. The device is available in the industry-standard SOIC-8 package, ensuring easy integration into existing designs. An RS-485 transceiver is a line driver and receiver pair that enables robust differential data communication over long distances and in noisy environments. It converts TTL/CMOS logic levels to differential signals on a twisted-pair bus, allowing multiple devices to share the same wiring. RS-485 is a physical layer standard defined by the TIA/EIA-485 specification, widely used in industrial automation, building control, and networking. The ST1480ACDR implements this standard with a 3.3V supply, reducing power consumption compared to 5V counterparts while maintaining compatibility with 5V logic through its fail-safe receiver. Key features of the ST1480ACDR include a wide common-mode input range of -7V to +12V, which enhances noise immunity and allows operation in harsh industrial environments. The device features a 1/8 unit load, allowing up to 256 transceivers on a single bus, and includes thermal shutdown and short-circuit protection for robust operation. Its low quiescent current of 900 uA makes it ideal for power-sensitive applications. The ST1480ACDR uses a standard RS-485 architecture with a differential driver and receiver, featuring a tri-state output for half-duplex operation. The receiver has a fail-safe design that ensures a high output when the inputs are open, shorted, or terminated, preventing false data. The driver is capable of delivering up to 60 mA of output current, meeting the RS-485 standard's minimum requirement of 1.5V differential output across a 54-ohm load. Typical applications include industrial control networks, building automation, HVAC systems, and point-of-sale terminals. Its high data rate and robust ESD protection (8 kV HBM) make it suitable for factory automation and process control. The device is also used in security systems and remote sensor networks where reliable long-distance communication is critical. When designing with the ST1480ACDR, ensure proper termination (120-ohm) at both ends of the bus to minimize reflections. The fail-safe receiver feature eliminates the need for external bias resistors in most applications, simplifying the design. For half-duplex operation, control the driver enable (DE) and receiver enable (RE) pins to avoid bus contention.