Datasheet

Data Sheet AD5686R/AD5685R/AD5684R
Rev. B | Page 29 of 32
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 63 shows a 4-channel
isolated interface to the AD5686R/AD5685R/AD5684R
using an ADuM1400. For further information, visit
http://www.analog.com/icoupler.
Figure 63. 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.
10485-167