AD5748 datasheet(31/32 Pages) AD

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AD5748

Rev. A | Page 31 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. The

iCoupler® family of products from Analog Devices, Inc., provides

voltage isolation in excess of 5.0 kV. The serial loading structure

of the AD5748 makes it ideal for isolated interfaces because the

number of interface lines is kept to a minimum. Figure 56 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 56. Isolated Interface

MICROPROCESSOR INTERFACING

Microprocessor interfacing to the AD5748 is via a serial bus

that uses a protocol compatible with microcontrollers and DSP

processors. The communications channel is a 3-wire (minimum)

interface consisting of a clock signal, a data signal, and a SYNC

signal. The AD5748 requires a 16-bit data-word with data valid

on the falling edge of SCLK.

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