ADM3483E Datasheet

• TIA/EIA RS-485/RS-422 compliant
• ±15 kV ESD protection on RS-485 input/output pins
• Data rates: ADM3483E: 250 kbps
• Half duplex options
• Up to 32 nodes on the bus
• Receiver open-circuit, fail-safe design
• Low power shutdown current
• Outputs high-Z when disabled or powered off
• Common-mode input range: −7 V to +12 V
• Thermal shutdown and short-circuit protection
• Industry-standard 75176 pinout
• 8-lead SOIC package

• Power/energy metering
• Telecommunications
• EMI-sensitive systems
• Industrial control
• Local area networks

The ADM3483E are 3.3 V, low power data transceivers with ±15 kV ESD protection suitable for full- and half-duplex communication on multipoint bus transmission lines. They are designed for balanced data transmission, and they comply with TIA/EIA standards RS485 and RS-422. The ADM3483E are half-duplex transceivers that share differential lines and have separate enable inputs for the driver and receiver.

The devices have a 12 kΩ receiver input impedance, which allows up to 32 transceivers on a bus. Because only one driver should be enabled at any time, the output of a disabled or powered-down driver is tristated to avoid overloading the bus.

The driver outputs of the ADM3483E are slew rate limited, in order to reduce EMI and data errors caused by reflections from improperly terminated buses. The receiver has a fail-safe feature that ensures a logic high output when the inputs are floating. Excessive power dissipation caused by bus contention or by output shorting is prevented with a thermal shutdown circuit. The parts are fully specified over the industrial temperature range and are available in 8-lead narrow SOIC packages.