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Data Sheet
500 kbps, ESD Protected, Half-/Full-Duplex, iCoupler, Isolated RS-485 Transceiver ADM2484E
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
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 halfduplex 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.
GALVANIC ISOLATION
06984-001
FUNCTIONAL BLOCK DIAGRAM
VDD1
VDD2
ADM2484E
DE
TxD
RxD RE
GND1
Figure 1.
GND2
Y Z
A B
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.
Rev. G
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ADM2484E
TABLE OF CONTENTS
Features .............................................................................................. 1 Applications....................................................................................... 1 Functional Block Diagram .............................................................. 1 General Description ......................................................................... 1 Revision History ............................................................................... 2 Specifications..................................................................................... 3
Timing Specifications .................................................................. 4 Package Characteristics ............................................................... 4 Regulatory Information............................................................... 4 Insulation and Safety-Related Specifications............................ 5 VDE 0884 Insulation Characteristics ........................................ 5 Absolute Maximum Ratings............................................................ 6 ESD Caution.................................................................................. 6 Pin Configuration and Function Descriptions............................. 7 Typical Performance Characteristics ............................................. 8
REVISION HISTORY
5/2018—Rev. F to Rev. G Change to Features Section ............................................................. 1 Changes to Table 4............................................................................ 4
11/2015—Rev. E to Rev. F Added Table 8; Renumbered Sequentially .................................... 6
3/2015—Rev. D to Rev. E Changes to CTI Value and Isolation Group, Table 5 ................... 5
3/2014—Rev. C to Rev. D Changes to Features Section............................................................ 1 Changed VIORM from 846 VPEAK to 849 VPEAK, Table 4.