GENERAL DESCRIPTION

The ADM2484E is an isolated data transceiver with ±15 kV ESD protection suitable for high speed, half- or full-duplex communication on multipoint transmission lines. For half-duplex operation, the transmitter outputs and receiver inputs share the same transmission line. Transmitter Output Pin Y links externally to Receiver Input Pin A, and Transmitter Output Pin Z links externally to Receiver Input Pin B.

Designed for balanced transmission lines, the ADM2484E 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 three-state 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 up to ±15 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 3.3 V supply.

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

FEATURES

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

±15 kV ESD protection on RS-485 input/output pins

500 kbps 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

True fail-safe receiver inputs

256 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, VIORM = 849 VPEAK

CSA Component Acceptance Notice 5A

IEC 60950-1: 390 V rms (reinforced)

Operating temperature range: ?40°C to +85°C

Wide body, 16-lead SOIC package

APPLICATIONS

Isolated RS-485/RS-422 interfaces

Industrial field networks

INTERBUS

Multipoint data transmission systems