Data Sheet

ADM3061E/ADM3062E/ADM3063E/ADM3064E/ADM3065E/ADM3066E/ADM3067E/ADM3068E

Rev. G | Page 23 of 27

ISOLATED HIGH SPEED RS-485 NODE

Galvanic isolation, with reinforced insulation and 5 kV rms

transient withstand voltage, can be added to the ADM3065E

using Analog Devices, Inc., iCoupler® and isoPower® technology.

The ADuM6401 provides the required quad channels of 5 kV rms

signal isolation, operating at rates up to 25 Mbps, together with

an integrated dc-to-dc converter. The ADuM6401 combines with

remains within the load capability of ADuM6401 even at 25 Mbps.

The dc-to-dc converter in the ADuM6401 isoPower device

provides regulated, isolated power to the ADM3065E (and the

ADuM241D). These isoPower devices use high frequency

switching elements to transfer power through the transformers.

Take care during PCB layout to meet emissions standards. See the

AN-0971 Application Note for PCB layout recommendations.

Galvanic isolation of the ADM3065E at the full data rate, up to

50 Mbps, can be implemented using the ADuM241D quad-

channel digital isolator and the ADuM6028 isolated dc-to-dc

converter, as shown in Figure 49. The ADuM6028 is an 8-pin

device that contains a 300 mW dc-to-dc converter optimized to

meet emissions standards on a 2-layer PCB using two ferrite

beads. The ADuM241D operates at a data rate up to 150 Mbps,

and offers the precise timing required to fully support the

ADM3065E at 50 Mbps.

5V

0.1µF

RO

RE

DE

DI

A

B

D

R

GND

ADM3065E

FERRITE

BEAD

10nF

5V

0.1µF

0.1µF

2

3

4

5

6

7

8

16

15

14

13

12

11

10

9

1

4-CHANNEL iCOUPLER CORE

ADuM6401

Figure 48. Signal and Power Isolated 25 Mbps RS-485 Solution (Simplified Diagram—All Connections Not Shown)

DECODE

ENCODE

ENCODE

DECODE

ENCODE

DECODE

ENCODE

DECODE

ADuM241D

+5V

+5V

RO

RE

DE

DI

A

B

D

R

GND

ADM3065E

0.1µF

10nF

10μF

FERRITE BEAD

FERRITE BEAD

0.1µF

0.1µF

PDIS

1

2

3

4

5

6

8

7

OSC

RECT

REG

PCS

ADuM6028

Figure 49. Signal and Power Isolated 50 Mbps RS-485 Solution (Simplified Diagram—All Connections Not Shown)