ADM485E Series
5 V, ±15 kV ESD Protected, Half Duplex RS-485/RS-422 Transceiver (2.5 Mbps)
Manufacturer: Analog Devices
Catalog
5 V, ±15 kV ESD Protected, Half Duplex RS-485/RS-422 Transceiver (2.5 Mbps)
Key Features
• TIA/EIA RS-485/RS-422 compliant
• ESD protection on RS-485 I/O pins
• ±15 kV human body model
• Data rates: 2.5 Mbps
• Half-duplex options
• Reduced slew rates for low EMI
• −7 V to +12 V common-mode input range
• Thermal shutdown and short-circuit protection
• 8-lead SOIC packages
• Energy/power metering
• Lighting systems
• Industrial control
• Telecommunications
• Security systems
• Instrumentation
Description
AI
The ADM485E /ADM487E/ADM1487Eare 5 V low power data transceivers with ±15 kV ESD protection suitable for half duplex communication on multipoint bus transmission lines. They are designed for balanced data transmission and comply with TIA/EIA standards RS-485 and RS-422. The ADM487E and the ADM1487E have a 1/4 unit load receiver input impedance that allows up to 128 transceivers on a bus, while the ADM485E allow up to 32 transceivers on a bus. Since only one driver is enabled at any time, the output of a disabled or powerdown driver is three-stated to avoid overloading the bus.The driver outputs are slew rate-limited in order to reduce EMI and data errors caused by reflections from improperly terminated buses. Excessive power dissipation caused by bus contention or output shorting is prevented with a thermal shutdown circuit. The parts are fully specified over the industrial temperature ranges and are available in 8-lead SOIC packagesAPPLICATIONSEnergy/power meteringLighting systemsIndustrial controlTelecommunicationsSecurity systemsInstrumentation
