AD5372BCPZ datasheet(23/25 Pages) AD

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Preliminary Technical Data

AD5372/AD5373

Rev. P

rF | Page 23 of 25

INTERFACING EXAMPLES

The SPI interface of the AD5372/AD5373 is designed to allow

the parts to be easily connected to industry standard DSPs and

micro-controllers. Figure 11 shows how the AD5372/AD5373

could be connected to the Analog Devices Blackfin

DSP. The

Blackfin has an integrated SPI port which can be connected

directly to the SPI pins of the AD5372/AD5373 and

programmable I/O pins which can be used to set or read the

state of the digital input or output pins associated with the

interface.

SYNC

SCLK

SDI

SDO

CLR

LDAC

RESET

BUSY

SPISELx

SCK

MOSI

MISO

PF8

PF9

PF10

PF7

AD537x

ADSP-BF531

537x-0101

Figure 11. Interfacing to a Blackfin DSP

The Analog Devices ADSP-21065L is a floating point DSP with

two serial ports (SPORTS). Figure 12 shows how one SPORT

can be used to control the AD5372/AD5373. In this example

the Transmit Frame Synchronization (TFS) pin is connected to

the Receive Frame Synchronization (RFS) pin. Similarly the

transmit and receive clocks (TCLK and RCLK) are also

connected together. The user can write to the AD5372/AD5373

by writing to the transmit register. A read operation can be

accomplished by first writing to the AD5372/AD5373 to tell the

part that a read operation is required. A second write operation

with a NOP instruction will cause the data to be read from the

AD5372/AD5373. The DSPs receive interrupt can be used to

indicate when the read operation is complete.

SYNC

SCLK

SDI

SDO

CLR

LDAC

RESET

BUSY

TFSx

RFSx

TCLKx

RCLKx

DTxA

DRxA

FLAG2

FLAG1

FLAG0

FLAG3

AD537x

537x-0101

ADSP-21065L

Figure 12. Interfacing to an ADSP-21065L DSP

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