High Speed, ESD-Protected, Full-Duplex,
iCoupler®, Isolated RS-485 Transceiver
ADM2490E
FEATURES
FUNCTIONAL BLOCK DIAGRAM
V
V
DD2
DD1
Isolated, full-duplex RS-485/RS-422 transceiver
8 kV ESD protection on RS-485 input/output pins
16 Mbps data rate
ADM2490E
Complies with ANSI TIA/EIA RS-485-A-1998 and
ISO 8482: 1987(E)
Y
Z
TxD
RxD
Suitable for 5 V or 3 V operation (VDD1
)
High common-mode transient immunity: >25 kV/μs
Receiver has open-circuit, fail-safe design
32 nodes on the bus
A
B
Thermal shutdown protection
Safety and regulatory approvals pending
UL recognition: 5000 V rms isolation voltage
for 1 minute per UL 1577
GND
GND
2
1
Figure 1.
VDE certificate of conformity
DIN EN 60747-5-2 (VDE 0884 Part 2): 2003-01
DIN EN 60950 (VDE 0805): 2001-12; EN 60950: 2000
GENERAL DESCRIPTION
The ADM2490E is an isolated data transceiver with ±± ꢀk EꢁD
protection and is suitable for high speed, full-duplex
VIORM = 848 VPEAK
Operating temperature range: −40°C to +105°C
Wide-body, 16-lead SOIC package
communication on multipoint transmission lines. It is designed
for balanced transmission lines and complies with ANꢁI
TIA/EIA Rꢁ-4±5-A-199± and IꢁO ±4±2: 19±7(E). The device
employs Analog Devices, Inc., iCoupler technology to combine
a 2-channel isolator, a 3-state differential line driver, and a
differential input receiver into a single pacꢀage.
APPLICATIONS
Isolated RS-485/RS-422 interfaces
Industrial field networks
INTERBUS
The differential transmitter outputs and receiver inputs feature
electrostatic discharge circuitry that provides protection to
±± ꢀk using the human body model (HBM). The logic side of
the device can be powered with either a 5 k or a 3 k supply,
whereas the bus side requires an isolated 5 k supply.
Multipoint data transmission systems
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.
Rev. 0
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