Datasheet

ADM2582E/ADM2587E Data Sheet
Rev. F | Page 18 of 20
TYPICAL APPLICATIONS
An example application of the ADM2582E/ADM2587E for a full-
duplex RS-485 node is shown in the circuit diagram of Figure 40.
Refer to the PCB Layout section for the recommended placement
of the capacitors shown in this circuit diagram. Placement of the R
T
termination resistors depends on the location of the node and the
network configuration. Refer to the AN-960 Application Note,
RS-485/ RS-422 Circuit Implementation Guide, for guidance on
termination.
Figure 41 and Figure 42 show typical applications of the
ADM2582E/ADM2587E in half duplex and full duplex RS-485
network configurations. Up to 256 transceivers can be connected to
the RS-485 bus. To minimize reflections, terminate the line at the
receiving end in its characteristic impedance and keep stub lengths
off the main line as short as possible. For half-duplex operation, this
means that both ends of the line must be terminated because either
end can be the receiving end.
ADM2582E/ADM2587E
TxD
A
B
Y
Z
DE
RxD
RE
ISOLATION
BARRIER
TRANSCEIVER
GND
1
GND
1
GND
2
ENCODE
ENCODE
ENCODE
DECODE
DECODE
DECODE
D
R
OSCILL
A
T
OR
RECTIFIER
REGUL
AT
OR
V
ISOOUT
V
CC
V
CC
V
ISOIN
MICROCONTROLLER
AND UART
R
T
3.3V/5V POWER
SUPP
L
Y
100nF
10µF
100nF
10nF
100nF
10µF
100nF
10nF
DIGI
TA
L
ISOL
A
TION
i
Coupler
iso
Power DC-
T
O-DC CONVERTER
08111-124
Figure 40. Example Circuit Diagram Using the ADM2582E/ADM2587E
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