AD5686 datasheet(25/28 Pages) AD

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Data Sheet

AD5686/AD5684

Rev. A | Page 25 of 28

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 structure of the

AD5686/AD5684 makes the part ideal for isolated interfaces

because the number of interface lines is kept to a minimum.

Figure 46 shows a 4-channel isolated interface to the AD5686/

AD5684 using an ADuM1400. For more information, visit

http://www.analog.com/icouplers.

Figure 46. 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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