Datasheet

AD5360/AD5361
Rev. A | Page 26 of 28
INTERFACING EXAMPLES
The SPI interface of the AD5360 and AD5361 is designed to
allow the parts to be easily connected to industry standard DSPs
and microcontrollers. Figure 25 shows how the AD5360/AD5361
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 AD5360 or AD5361, and programmable
I/O pins that can be used to set or read the state of the digital
input or output pins associated with the interface.
SPISELx
ADSP-BF531
AD5360/
AD5361
SCK
MOSI
MISO
PF10
PF8
PF9
PF7
SYNC
SCLK
SDI
SDO
RESET
CLR
LDAC
BUSY
05761-024
Figure 25. Interfacing to a Blackfin DSP
The Analog Devices ADSP-21065L is a floating-point DSP with
two serial ports (SPORTs). Figure 26 shows how one SPORT
can be used to control the AD5360 or AD5361. 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 AD5360 or
AD5361 by writing to the transmit register. A read operation
can be accomplished by first writing to the AD5360/AD5361
to tell the part that a read operation is required. A second write
operation with a NOP instruction causes the data to be read
from the AD5360/AD5361. The DSPs receive interrupt can be
used to indicate when the read operation is complete.
SYNC
SCLK
SDI
SDO
RESET
CLR
LDAC
BUSY
AD5360/
AD5361
ADSP-21065L
TFSx
RFSx
TCLKx
RCLKx
DTxA
DRxA
FLAG
0
FLAG
1
FLAG
2
FLAG
3
0
5761-025
Figure 26. Interfacing to an ADSP-21065L DSP