3.3 V, ± ±1 ꢀV ꢁESD-Proteotꢂ, ꢃHalD Hꢄꢂ
FuaaDSupatx, RED481/RED422 TPHꢄsetivtPs
ASM3483ꢁ/ASM3486ꢁ/ASM3488ꢁ/ASM3490ꢁ/ASM349±ꢁ
FEATURES
FUNCTIONAL BLOCK DIAGRAMS
V
TIA/EIA RS-485/RS-422 compliant
15 kV ESD protection on RS-485 input/output pins
Data rates
CC
ADM3483E/
ADM3486E
ADM3483E/ADM3488E: 250 kbps
ADM3486E: 2.5 Mbps
ADM3490E/ADM3491E: 12 Mbps
Half- and full-duplex options
R
RO
RE
DE
A
B
DI
D
Up to 32 nodes on the bus
Receiver open-circuit, fail-safe design
Low power shutdown current
GND
(ADM3483E/ADM3486E/ADM3491E only)
Outputs high-Z when disabled or powered off
Common-mode input range: −7 V to +12 V
Thermal shutdown and short-circuit protection
Industry-standard 75176 pinout
8-lead and 14-lead narrow SOIC packages
Figure 1.
V
CC
ADM3488E/
ADM3490E
A
B
R
RO
DI
APPLICATIONS
Power/energy metering
Telecommunications
EMI-sensitive systems
Industrial control
Z
Y
D
GND
Figure 2.
Local area networks
V
CC
GENERAL DESCRIPTION
The ADM3483E/ADM3486E/ADM3488E/ADM3490E/
ADM3491E are 3.3 V, low power data transceivers with
1ꢀ ꢁV EꢂD protection suitable for full- and half-duplex
communication on multipoint bus transmission lines. They
are designed for balanced data transmission, and they
comply with TIA/EIA standards Rꢂ48ꢀ and Rꢂ-422. The
ADM3483E/ADM3486E are half-duplex transceivers that
share differential lines and have separate enable inputs for
the driver and receiver. The full-duplex ADM3488E/
ADM3490E/ADM3491E transceivers have dedicated
differential line driver outputs and receiver inputs. The
ADM3491E also features separate enable inputs for the
driver and receiver.
ADM3491E
A
B
R
RO
RE
DE
Z
Y
DI
D
GND
Figure 3.
The devices have a 12 ꢁΩ receiver input impedance,
which allows up to 32 transceivers on a bus. Because only
one driver should be enabled at any time, the output of a
disabled or powered-down driver is tristated to avoid
overloading the bus.
(continued on Page 3)
Rev. A
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