AD9833 datasheet(18/21 Pages) AD

18 / 21 page

AD9833

Data Sheet

Rev. F | Page 18 of 21

DATA WRITE

(SEE FIGURE 28)

SELECT DATA

SOURCES

WAIT 7/8 MCLK

CYCLES

VOUT = VREF × 18 × RLOAD / RSET × (1 + (SIN (2π (FREQREG × fMCLK × t/228 + PHASEREG / 212))))

DAC OUTPUT

CHANGE PHASE?

CHANGE FREQUENCY?

CHANGE DAC OUTPUT

FROM SIN TO RAMP?

CHANGE OUTPUT TO

A DIGITAL SIGNAL?

CHANGE

PSELECT?

CHANGE PHASE

CHANGE

FSELECT?

CHANGE FREQUENCY

CONTROL REGISTER

WRITE

(SEE TABLE 6)

INITIALIZATION

(SEE FIGURE 27 BELOW)

YES

Figure 26. Flowchart for AD9833 Initialization and Operation

INITIALIZATION

APPLY RESET

(CONTROL REGISTER WRITE)

RESET = 1

WRITE TO FREQUENCY AND PHASE REGISTERS

FREQ0 REG =

fOUT0/fMCLK × 228

FREQ1 REG =

fOUT1/fMCLK × 228

PHASE0 AND PHASE1 REG = (PHASESHIFT × 212

)/2π

(SEE FIGURE 28)

SET RESET = 0

SELECT FREQUENCY REGISTERS

SELECT PHASE REGISTERS

(CONTROL REGISTER WRITE)

RESET BIT = 0

FSELECT = SELECTED FREQUENCY REGISTER

PSELECT = SELECTED PHASE REGISTER

Figure 27. Flowchart for Initialization

AD9833 Datasheet(PDF) 18 Page - Analog Devices

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