ADM2491E 5 kV Signal Isolated, High Speed (16 Mbps), ESD Protected, Full/Half Duplex RS-485 Transceiver

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 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

Features and Benefits

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 UL 1577
VDE certificate of conformity DIN V VDE V 0884-10 (VDE V 0884-10): 2006-12 Reinforced insulation, VIORM = 849 V peak

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

VDE certificate of conformity

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

Interface & Isolation

Isolated RS-485

Aerospace and Defense

Solutions

Data Sheets

Document	note
ADM2491E: High Speed, ESD-Protected, Half-/Full-Duplex iCoupler Isolated RS-485 Transceiver Data Sheet (Rev. C)	PDF 518 kB

Application Notes

Document	note
AN-1179: Junction Temperature Calculation for Analog Devices RS-485/RS-422, CAN, and LVDS/M-LVDS Transceivers (Rev. A)	PDF 156.87 K
AN-1176: Component Footprints and Symbols in the Binary .Bxl File Format (Rev. 0)	PDF 671 kB
AN-960: RS-485/RS-422 Circuit Implementation Guide (Rev. 0)	PDF 245 kB

User Guides

Document	note
UG-302: Evaluation Board for the ADM2491E ±8 kV Signal Isolated, High Speed (16 Mbps), ESD Protected, Full/Half Duplex RS-485 Transceiver	PDF 198 kB