EVAL-ADM2582EEBZ View Datasheet(PDF) - Analog Devices

Part Name

Description

MFG CO.

EVAL-ADM2582EEBZ

Signal and Power Isolated RS-485 Transceiver with ±15 kV ESD Protection

Analog Devices 

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ADM2582E/ADM2587E

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 RT

termination resistors depends on the location of the node and the

network configuration. Refer to Application Note AN-960, 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.

3.3V/5V POWER

SUPPLY

100nF 10µF 100nF 10nF

VCC

VCC

isoPower DC-TO-DC CONVERTER

OSCILLATOR

RECTIFIER

VISOOUT

REGULATOR

100nF 10µF

VISOIN

100nF

10nF

MICROCONTROLLER

AND UART

GND1

DIGITAL ISOLATION iCoupler

TRANSCEIVER

Y

TxD

ENCODE

DECODE

D

Z

DE

ENCODE

DECODE

RxD

DECODE

ENCODE

R

RE

GND1

ADM2582E/ADM2587E

ISOLATION

BARRIER

GND2

A

B

RT

Figure 40. Example Circuit Diagram Using the ADM2582E/ADM2587E

Rev. C | Page 18 of 20

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