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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