ADM2491E

高速， ESD保护，半/全双工， iCoupler隔离RS- 485收发器 High Speed, ESD-Protected, Half-/Full-Duplex, iCoupler Isolated RS-485 Transceiver

Product Details

The is an isolated data transceiver with ±8 kV ESD protection and is suitable for high speed, half- or full-duplex communication on multipoint transmission lines. For half-duplex operation, the transmitter outputs and the receiver inputs share the same transmission line. Transmitter output Pin Y is linked externally to receiver input Pin A, and transmitter output Pin Z to receiver input Pin B.

The ADM2491E is designed for balanced transmission lines and complies with ANSI TIA/EIA RS-485-A-1998 and ISO 8482: 1987E. The device employs Analog Devices, Inc., iCoupler® technology to combine a 3-channel isolator, a threestate differential line driver, and a differential input receiver into a single package

The differential transmitter outputs and receiver inputs feature electrostatic discharge circuitry that provides protection to ±8 kV using the human body model HBM. The logic side of the device can be powered with either a 5 V or a 3.3 V supply, whereas the bus side requires an isolated 5 V supply.

The device has current-limiting and thermal shutdown features to protect against output short circuits and situations where bus contention could cause excessive power dissipation.

The ADM2491E is available in a wide body, 16-lead SOIC package and operates over the −40°C to +85°C temperature range.

Applications

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Isolated RS-485/RS-422 interfaces

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Industrial field networks

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INTERBUS

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Multipoint data transmission systems

### Features and Benefits

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Isolated, RS-485/RS-422 transceiver, configurable as half- or full-duplex

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±8 kV ESD protection on RS-485 input/output pins

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16 Mbps data rate

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Complies with ANSI TIA/EIA RS-485-A-1998 and ISO 8482: 1987E

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Suitable for 5 V or 3.3 V operation VDD1

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High common-mode transient immunity: >25 kV/µs

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Receiver has open-circuit, fail-safe design

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32 nodes on the bus

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Thermal shutdown protection

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Safety and regulatory approvals

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UL recognition: 5000 V rms isolation voltage for 1 minute, per UL 1577

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VDE certificate of conformity

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DIN V VDE V 0884-10 VDE V 0884-10: 2006-12

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Reinforced insulation, VIORM = 849 V peak

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See data sheet for additional features