AD5686R datasheet(29/31 Pages) AD

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Data Sheet

AD5686R/AD5685R/AD5684R

Rev. D | Page 29 of 31

GALVANICALLY ISOLATED INTERFACE

In many process control applications, it is necessary to

provide an isolation barrier between the controller and

the unit being controlled to protect and isolate the controlling

circuitry from any hazardous common-mode voltages that

may occur. iCoupler® products from Analog Devices provide

voltage isolation in excess of 2.5 kV. The serial loading struc-

ture of the AD5686R/AD5685R/AD5684R makes the part

ideal for isolated interfaces because the number of interface

lines is kept to a minimum. Figure 62 shows a 4-channel

isolated interface to the AD5686R/AD5685R/AD5684R

using an ADuM1400. For further information, visit

http://www.analog.com/i

Coupler.

Figure 62. Isolated Interface

ENCODE

SERIAL

CLOCK IN

CONTROLLER

ADuM14001

SERIAL

DATA OUT

SYNC OUT

LOAD DAC

OUT

DECODE

SCLK

SDIN

SYNC

LDAC

VIA

VOA

ENCODE

DECODE

VIB

VOB

ENCODE

DECODE

VIC

VOC

ENCODE

DECODE

VID

VOD

1ADDITIONAL PINS OMITTED FOR CLARITY.

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