Datasheet

AD5750/AD5750-1/AD5750-2 Data Sheet
Rev. E | Page 32 of 36
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. The
iCoupler® family of products from Analog Devices, Inc., provides
voltage isolation in excess of 5.0 kV. The serial loading structure
of the AD5750/AD5750-1/AD5750-2 makes it ideal for isolated
interfaces because the number of interface lines is kept to a
minimum. Figure 58 shows a 4-channel isolated interface
using an ADuM1400. For further information, visit
www.analog.com/icouplers.
Figure 58. Isolated Interface
MICROPROCESSOR INTERFACING
Microprocessor interfacing to the AD5750/AD5750-1/AD5750-2
is via a serial bus that uses a protocol that is compatible with
microcontrollers and DSP processors. The communication
channel is a 3-wire (minimum) interface consisting of a clock
signal, a data signal, and a
SYNC
signal. The AD5750/AD5750-1/
AD5750-2 require a 16-bit data-word with data valid on the
falling edge of SCLK.
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V
IA
V
OA
TO
SCLK
V
IB
V
OB
TO
SDIN
V
IC
V
OC
TO
SYNC
V
ID
V
OD
TO
CLEAR
SERIAL
CLOCK OUT
SERIAL
DATA OUT
SYNC OUT
CONTROL OUT
CONTROLLER ADuM1400
1
1
ADDITIONAL PINS OMITTED FOR CLARITY.
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07268-052