ADM2491E Series

5 kV Signal Isolated, High Speed (16 Mbps), ESD Protected, Full/Half Duplex RS-485 Transceiver

Catalog

5 kV Signal Isolated, High Speed (16 Mbps), ESD Protected, Full/Half Duplex RS-485 Transceiver

Part	Rise / Fall Time (Typ)	Supplier Device Package	Type	Technology	Operating Temperature [Max]	Operating Temperature [Min]	Inputs - Side 1/Side 2 [custom]	Inputs - Side 1/Side 2 [custom]	Common Mode Transient Immunity (Min) [Min]	Isolated Power	Voltage - Supply	Channel Type	Number of Channels [custom]	Propagation Delay tpLH / tpHL (Max)	Package / Case [x]	Package / Case	Package / Case [y]	Data Rate	Mounting Type
Analog Devices ADM2491EBRWZ-REEL7	20 ns 20 ns	16-SOIC	RS422 RS485	Magnetic Coupling	85 °C	-40 °C	2	1	25 kV/µs		3.3 V 5 V	Unidirectional	3	60 ns	0.295 in	16-SOIC	7.5 mm	16 MBd	Surface Mount
Analog Devices ADM2491EBRWZ	20 ns 20 ns	16-SOIC	RS422 RS485	Magnetic Coupling	85 °C	-40 °C	2	1	25 kV/µs		3.3 V 5 V	Unidirectional	3	60 ns	0.295 in	16-SOIC	7.5 mm	16 MBd	Surface Mount

Catalog

5 kV Signal Isolated, High Speed (16 Mbps), ESD Protected, Full/Half Duplex RS-485 Transceiver

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 approvalsUL recognition: 5000 V rms isolation voltage for 1 minute, per UL 1577VDE certificate of conformityDIN V VDE V 0884-10 (VDE V 0884-10): 2006-12Reinforced insulation, VIORM= 849 V peak

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

• VDE certificate of conformityDIN V VDE V 0884-10 (VDE V 0884-10): 2006-12Reinforced insulation, VIORM= 849 V peak

• DIN V VDE V 0884-10 (VDE V 0884-10): 2006-12

• Reinforced insulation, VIORM= 849 V peak

• See data sheet for additional features

Description

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 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: 1987(E). 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 packageThe 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.ApplicationsIsolated RS-485/RS-422 interfacesIndustrial field networksINTERBUSMultipoint data transmission systems