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AD9952 View Datasheet(PDF) - Analog Devices

Part NameDescriptionManufacturer
AD9952 400 MSPS 14-Bit, 1.8 V CMOS Direct Digital Synthesizer ADI
Analog Devices ADI
AD9952 Datasheet PDF : 28 Pages
First Prev 21 22 23 24 25 26 27 28
AD9952
There are two phases to a communication cycle with the
AD9952. Phase 1 is the instruction cycle, which is the writing of
an instruction byte into the AD9952, coincident with the first
eight SCLK rising edges. The instruction byte provides the
AD9952 serial port controller with information regarding the
data transfer cycle, which is Phase 2 of the communication cycle.
The Phase 1 instruction byte defines whether the upcoming data
transfer is read or write and the serial address of the register
being accessed. (Note that the serial address of the register
being accessed is NOT the same address as the bytes to be
written. See the Example Operation section for details.)
The first eight SCLK rising edges of each communication cycle
are used to write the instruction byte into the AD9952. The
remaining SCLK edges are for Phase 2 of the communication
cycle. Phase 2 is the actual data transfer between the AD9952
and the system controller. The number of bytes transferred
during Phase 2 of the communication cycle is a function of the
register being accessed. For example, when accessing the Control
Function Register No. 2, which is three bytes wide, Phase 2 requires
that three bytes be transferred. If accessing the frequency tuning
word, which is four bytes wide, Phase 2 requires that four bytes
be transferred. After transferring all data bytes per the instruc-
tion, the communication cycle is completed.
At the completion of any communication cycle, the AD9952
serial port controller expects the next eight rising SCLK edges
to be the instruction byte of the next communication cycle. All
data input to the AD9952 is registered on the rising edge of
SCLK. All data is driven out of the AD9952 on the falling edge
of SCLK. Figure 23 through Figure 26 are useful in understand-
ing the general operation of the AD9952 serial port.
CS
SCLK
SDIO
I7
INSTRUCTION CYCLE
DATA TRANSFER CYCLE
I6 I5 I4 I3 I2 I1 I0
D7 D6 D5 D4 D3 D2 D1 D0
Figure 23. Serial Port Write Timing–Clock Stall Low
CS
SCLK
SDIO
I7
SDO
INSTRUCTION CYCLE
DATA TRANSFER CYCLE
I6 I5 I4 I3 I2 I1 I0
DON'T CARE
DO 7 DO 6 DO 5 DO 4 DO 3 DO 2 DO 1 DO 0
Figure 24. 3-Wire Serial Port Read Timing–Clock Stall Low
CS
SCLK
SDIO
INSTRUCTION CYCLE
DATA TRANSFER CYCLE
I7 I6 I5 I4 I3 I2 I1 I0
D7
D6 D5 D4 D3 D2 D1
D0
Figure 25. Serial Port Write Timing–Clock Stall High
CS
SCLK
SDIO
INSTRUCTION CYCLE
DATA TRANSFER CYCLE
I7 I6 I5 I4 I3 I2 I1 I0
DO 7 DO 6 DO 5 DO 4 DO 3 DO 2 DO 1 DO 0
Figure 26. 2-Wire Serial Port Read Timing—Clock Stall High
Rev. 0 | Page 22 of 28
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