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AD74322DARU

Low Cost, Low Power Stereo Audio Analog Front End

Analog Devices 

PRELIMINARY TECHNICAL DATA

AD74322

AD743xx

CDIN CLATCH CCLK CDOUT

AD743xx

CDIN CLATCH CCLK CDOUT

CONTROL DATA IN

CONTROL DATA OUT

CONTROL DATA LATCH

ARY CONTROL DATA CLOCK

LIMINICAL CCLK

Figure <Control_Cascade_Daisy_Chain>

PRE HN CDIN

MSB 14 13 12 11 10 9

EC TA DEVN

T A CDOUT

D MSB 14 13 12 11 10 9

8

DEV N

8

87

6

5

4

DEV 1

87

6

5

4

DEV N

DEV N

DEV 1

CLATCH

Figure <Control_Cascade_Timing_Daisy_Chain>

3

2

3

2

1 LSB

DEV 1

1 LSB

DEV 1

INTERFACING MULTIPLE DEVICES

Many applications require multiple channels of input and output. The

AD743xx series of devices are designed to cater for extending the number

of I/O channels by cascading devices together while interfacing to a single

control or data port. This reduces the overhead requirement on the

controller in terms of serial ports.

Control Port Cascading

There are two methods of cascading the Control Ports of

multiple AD743xx devices together so that all devices can

be controlled from a single controller serial port. One

method is to configure the multiple devices as a daisy

chain of Control Ports each 16-bits wide with common

Pr D 03/00

–13–

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