AD9837 datasheet(17/28 Pages) AD

17 / 28 page

Data Sheet

AD9837

Rev. A | Page 17 of 28

DATA WRITE

(SEE FIGURE 24)

SELECT DATA

SOURCES

WAIT 7/8 MCLK

CYCLES

CHANGE PHASE?

CHANGE FREQUENCY?

CHANGE DAC OUTPUT

FROM SIN TO TRIANGLE?

CHANGE OUTPUT TO

A DIGITAL SIGNAL?

CHANGE PHASE

CHANGE FREQUENCY

CONTROL REGISTER

WRITE

(SEE TABLE 7)

INITIALIZATION

(SEE FIGURE 23)

YES

CHANGE

FSEL BIT?

CHANGE

PSEL BIT?

Figure 22. Flowchart for AD9837 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 24)

SET RESET = 0

SELECT FREQUENCY REGISTERS

SELECT PHASE REGISTERS

(CONTROL REGISTER WRITE)

RESET BIT = 0

FSEL = SELECTED FREQUENCY REGISTER

PSEL = SELECTED PHASE REGISTER

Figure 23. Flowchart for Initialization

AD9837 Datasheet(PDF) 17 Page - Analog Devices

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