Datasheet

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
ADuM1400
1
SERIAL
DATA OUT
SYNC OUT
LOAD DAC
OUT
DECODE
TO
SCLK
TO
SDIN
TO
SYNC
TO
LDAC
V
IA
V
OA
ENCODE
DECODE
V
IB
V
OB
ENCODE DECODE
V
IC
V
OC
ENCODE
DECODE
V
ID
V
OD
1
ADDITIONAL PINS OMITTED FOR CLARITY.
10797-167