ADM2491EBRWZ

The ADM2491E 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 halfduplex 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 is linked 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: 1987(E). The device combines 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 in which bus contention could cause excessive power dissipation. The ADM2491E is available in a wide body, 16- lead SOIC package and operates over the - 40 ℃ to +85 ℃ temperature range.

Applications

• Isolated RS- 485/RS- 422 interfaces
• Industrial field networks
• INTERBUS
• Multipoint data transmission systems

Key features

• Isolated, RS- 485/RS- 422 transceiver, configurable as half- or full- duplex
• ±8 kV ESD protection on RS- 485 input/output pins
• 16 Mbps data rate
• Complies with ANSI TIA/EIA RS- 485- A- 1998 and ISO 8482:1987(E)
• Suitable for 5 V or 3.3 V operation (VDD1)
• High common- mode transient immunity: >25 kV / μs
• Receiver has open- circuit, fail- safe design
• 32 nodes on the bus
• Thermal shutdown protection
• Safety and regulatory approvals
• UL recognition:5000 V rms isolation voltage for 1 minute,per UL1577
• VDE certificate of conformity DIN V VDE V 0884- 10 (VDE V 0884- 10):2006- 12
• Reinforced insulation, VDRM = 849 V peak
• Operating temperature range: - 40 ℃ to +85 ℃
• Wide body, 16- lead SOIC package