AD5064 datasheet(32/36 Pages) AD

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AD5750/AD5750-1/AD5750-2

Data Sheet

Rev. D | 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.

VIA

VOA

SCLK

VIB

VOB

SDIN

VIC

VOC

SYNC

VID

VOD

CLEAR

SERIAL

CLOCK OUT

SERIAL

DATA OUT

SYNC OUT

CONTROL OUT

CONTROLLER

ADuM14001

1ADDITIONAL PINS OMITTED FOR CLARITY.

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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