ADM2483BRW データシートの表示（PDF） - Analog Devices

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ADM2483BRW

Half-Duplex, iCoupler® Isolated RS-485 Transceiver

Analog Devices 

ADM2483

CIRCUIT DESCRIPTION

ELECTRICAL ISOLATION

In the ADM2483, electrical isolation is implemented on the

logic side of the interface. Therefore, the part has two main

sections: a digital isolation section and a transceiver section (see

Figure 26). Driver input and data enable signals, applied to the

TxD and DE pins, respectively, and referenced to logic ground

(GND1), are coupled across an isolation barrier to appear at the

transceiver section referenced to isolated ground (GND2).

Similarly, the receiver output, referenced to isolated ground in

the transceiver section, is coupled across the isolation barrier to

appear at the RxD pin referenced to logic ground.

Data Sheet

iCoupler Technology

The digital signals are transmitted across the isolation barrier

using iCoupler technology. This technique uses chip-scale

transformer windings to couple the digital signals magnetically

from one side of the barrier to the other. Digital inputs are

encoded into waveforms that are capable of exciting the

primary transformer winding. At the secondary winding, the

induced waveforms are then decoded into the binary value that

was originally transmitted.

VDD1

VDD2

ISOLATION

BARRIER

A

TxD

ENCODE

DECODE

D

B

DE

ENCODE

DECODE

RxD

ENCODE

DECODE

R

RE

DIGITAL ISOLATION

TRANSCEIVER

GND1

GND2

Figure 26. ADM2483 Digital Isolation and Transceiver Sections

Rev. C | Page 14 of 20

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