ADM2483 datasheet(14/20 Pages) AD

14 / 20 page

ADM2483

Rev. 0 | Page 14 of 20

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 19). 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.

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.

TxD

DECODE

ENCODE

DECODE

ENCODE

RxD

DECODE

ENCODE

ISOLATION

BARRIER

DIGITAL ISOLATION

TRANSCEIVER

VDD1

VDD2

GND1

GND2

Figure 26. ADM2483 Digital Isolation and Transceiver Sections

ADM2483 Datasheet(PDF) 14 Page - Analog Devices