AD9834 datasheet(24/32 Pages) AD

24 / 32 page

AD9834

Data Sheet

INITIALIZATION

APPLY RESET

USING PIN

SET RESET PIN = 1

USING PIN

USING CONTROL

BIT

(CONTROL REGISTER WRITE)

RESET = 1

PIN/SW = 0

(CONTROL REGISTER WRITE)

PIN/SW = 1

USING CONTROL

BIT

SET RESET = 0

SELECT FREQUENCY REGISTERS

SELECT PHASE REGISTERS

(CONTROL REGISTER WRITE)

RESET BIT = 0

FSEL = SELECTED FREQUENCY REGISTER

PSEL = SELECTED PHASE REGISTER

PIN/SW = 0

(APPLY SIGNALS AT PINS)

RESET PIN = 0

FSELECT = SELECTED FREQUENCY REGISTER

PSELECT = SELECTED PHASE REGISTER

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 33)

Figure 32. Initialization

YES

DATA WRITE

YES

WRITE A FULL 28-BIT WORD

TO A FREQUENCY REGISTER?

(CONTROL REGISTER WRITE)

B28 (D13) = 1

WRITE TWO CONSECUTIVE

16-BIT WORDS

(SEE TABLE 11 FOR EXAMPLE)

WRITE ANOTHER FULL

28-BIT TO A

FREQUENCY REGISTER?

WRITE 14 MSBs OR LSBs

TO A FREQUENCY REGISTER?

(CONTROL REGISTER WRITE)

B28 (D13) = 0

HLB (D12) = 0/1

WRITE A 16-BIT WORD

(SEE TABLES 12 AND 13

FOR EXAMPLES)

WRITE 14 MSBs OR LSBs

TO A

FREQUENCY REGISTER?

WRITE TO PHASE

D15, D14 = 11

D13 = 0/1 (CHOOSE THE

PHASE REGISTER)

D12 = X

D11 ... D0 = PHASE DATA

(16-BIT WRITE)

WRITE TO ANOTHER

PHASE REGISTER?

Figure 33. Data Write

Rev. D | Page 24 of 32

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