500 kbps, ESD Protected, Half-/Full-Duplex,
iCoupler, Isolated RS-485 Transceiver
ADM2484E
FEATURES
FUNCTIONAL BLOCK DIAGRAM
V
V
DD2
DD1
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
ADM2484E
DE
Complies with ANSI TIA/EIA RS-485-A-1998 and
ISO 8482: 1987(E)
Y
Z
TxD
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
A
B
RxD
RE
Thermal shutdown protection
Safety and regulatory approvals pending
UL recognition
5000 V rms isolation voltage for 1 minute per UL1577
VDE certificate of conformity
GND
GND
2
1
Figure 1.
DIN V VDE V 0884-10 (VDE V 0884-10): 2006-12
Reinforced insulation, VIORM = 848 V peak
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
technology to combine a 3-channel isolator, a three-state
differential line driver, and a differential input receiver into a
single pacꢀage.
The ADM2484E is an isolated data transceiver with ±±1 ꢀk
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
linꢀs externally to Receiver Input Pin A, and Transmitter
Output Pin Z linꢀs externally to Receiver Input Pin B.
The differential transmitter outputs and receiver inputs feature
electrostatic discharge circuitry that provides protection up to
±±1 ꢀk using the human body model (HBM). The logic side of
the device can be powered with either a 1 k or a 3.3 k supply,
whereas the bus side requires an isolated 3.3 k supply.
Designed for balanced transmission lines, the ADM2484E
complies with ANSI TIA/EIA RS-481-A-±998 and ISO 8482:
±987(E). The device employs Analog Devices, Inc., iCoupler®
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. 0
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responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
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