ADM1490E Datasheet

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Package Description

• RS-485/RS-422 full-duplex transceiver for high speed motor control applications
• 16 Mbps data rate
• ±8 kV ESD protection on RS-485 input/output pins
• Open circuit fail-safe
• Suitable for 5 V power supply applications
• 32 nodes on the bus (1 unit load)
• See datasheet for additional features

• RS-485/RS-422 interfaces
• Industrial field networks
• High data rate motor control
• Multipoint data transmission systems
• Single-ended-to-differential signal conversion

The ADM1490E are RS-485/RS-422 transceivers with ±8 kV ESD protection and are suitable for high speed, full-duplex communication on multipoint transmission lines. In particular, the ADM1490E are designed for use in motor control applications requiring communications at data rates up to 16 Mbps.

The ADM1490E are designed for balanced transmission lines and comply with TIA/EIA-485-A-98. The devices each have a 12 kΩ receiver input impedance for unit load RS-485 operation, allowing up to 32 nodes on the bus.

The differential transmitter outputs and receiver inputs feature electrostatic discharge circuitry that provides protection to ±8 kV using the human body model (HBM).

The ADM1490E operate from a single 5 V power supply. Excessive power dissipation caused by bus contention or output shorting is prevented by short-circuit protection and thermal circuitry. Short-circuit protection circuits limit the maximum output current to ±250 mA during fault conditions. A thermal shutdown circuit senses if the die temperature rises above 150°C and forces the driver outputs into a high impedance state under this condition.

The receiver of the ADM1490E contains a fail-safe feature that results in a logic high output state if the inputs are unconnected (floating). The ADM1490E feature extremely fast and closely matched switching times. Minimal driver propagation delays permit transmission at data rates up to 16 Mbps, and low skew minimizes EMI interference.

The ADM1490E are fully specified over the commercial and industrial temperature ranges. The ADM1490E is available in two packages: a narrow body, 8-lead SOIC and an 8-lead MSOP.