ADM2687EBRIZ datasheet(20/24 Pages) AD

20 / 24 page

ADM2682E/ADM2687E

Rev. 0 | Page 20 of 24

TYPICAL APPLICATIONS

An example application of the ADM2682E/ADM2687E for a full-

duplex RS-485 node is shown in the circuit diagram of Figure 45.

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 AN-960 Application Note,

RS-485/RS-422 Circuit Implementation Guide, for guidance on

termination.

Figure 46 and Figure 47 show typical applications of the

ADM2682E/ADM2687E 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.

ADM2682E/ADM2687E

TxD

RxD

ISOLATION

BARRIER

TRANSCEIVER

GND1

GND2

ENCODE

DECODE

OSCILLATOR

RECTIFIER

REGULATOR

VISOOUT

VCC

VISOIN

MICROCONTROLLER

AND UART

3.3V/5V POWER

SUPPLY

100nF

10µF

100nF

10nF

100nF

10µF

100nF

10nF

DIGITAL ISOLATION iCoupler

isoPower DC-TO-DC CONVERTER

Figure 45. Example Circuit Diagram Using the ADM2682E/ADM2687E

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