AD5504 datasheet(18/20 Pages) AD

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AD5504

Data Sheet

Rev. B | Page 18 of 20

INTERFACING EXAMPLES

The SPI interface of the AD5504 is designed to allow it to be

easily connected to industry-standard DSPs and microcon-

trollers. Figure 19 shows how the AD5504 can be connected to

the Analog Devices, Inc., Blackfin® DSP. The Blackfin has an

integrated SPI port that can be connected directly to the SPI

pins of the AD5504. Programmable input/output pins are also

available and can be used to read or set the state of the digital

input or output pins associated with the interface.

SPISELx

ADSP-BF531

AD5504

SCK

MOSI

MISO

PF10

PF8

PF9

PF7

SYNC

SCLK

SDI

SDO

R_SEL

CLR

LDAC

ALARM

Figure 19. Interfacing to a Blackfin DSP

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

two serial ports (SPORTs). Figure 20 shows how one SPORT

can be used to control the AD5504. In this example, the transmit

frame synchronization (TFS) pin is connected to the receive

frame synchronization (RFS) pin. The transmit and receive

clocks (TCLK and RCLK) are also connected together. The user

can write to the AD5504 by writing to the transmit register. When a

read operation is performed, the data is clocked out of the AD5504

on the last 12 SCLKs. The DSP receive interrupt can be used to

indicate when the read operation is complete.

SYNC

SCLK

SDI

SDO

R_SEL

CLR

LDAC

ALARM

AD5504

ADSP-21065L

TFSx

RFSx

TCLKx

RCLKx

DTxA

DRxA

FLAG0

FLAG1

FLAG2

FLAG3

Figure 20. Interfacing to an ADSP-21065L DSP

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