AD9834CRUZ Datasheet, PDF (24/36 Pages) Analog Devices – 20 mW Power, 2.3 V to 5.5 V, 75 MHz Complete DDS

AD9834
INITIALIZATION
USING CONTROL
BIT
APPLY RESET
USING PIN
(CONTROL REGISTER WRITE)
RESET = 1
PIN/SW = 0
(CONTROL REGISTER WRITE)
PIN/SW = 1
SET RESET PIN = 1
WRITE TO FREQUENCY AND PHASE REGISTERS
FREQ0 REG = f_OUT0/f_MCLK × 2²⁸
FREQ1 REG = f_OUT1/f_MCLK × 2²⁸
PHASE0 AND PHASE1 REG = (PHASESHIFT × 2¹²)/2π
(SEE FIGURE 33)
USING CONTROL
BIT
SET RESET = 0
SELECT FREQUENCY REGISTERS
SELECT PHASE REGISTERS
USING PIN
(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
Figure 32. Initialization
DATA WRITE
WRITE A FULL 28-BIT WORD NO
TO A FREQUENCY REGISTER?
YES
(CONTROL REGISTER WRITE)
B28 (D13) = 1
WRITE 14 MSBs OR LSBs
NO
TO A FREQUENCY REGISTER?
YES
(CONTROL REGISTER WRITE)
B28 (D13) = 0
HLB (D12) = 0/1
WRITE TWO CONSECUTIVE
16-BIT WORDS
(SEE TABLE 11 FOR EXAMPLE)
WRITE A 16-BIT WORD
(SEE TABLES 12 AND 13
FOR EXAMPLES)
WRITE TO PHASE
REGISTER?
YES
(16-BIT WRITE)
D15, D14 = 11
D13 = 0/1 (CHOOSE THE
PHASE REGISTER)
D12 = X
D11 ... D0 = PHASE DATA
YES
WRITE ANOTHER FULL
28-BIT TO A
FREQUENCY REGISTER?
NO
WRITE 14 MSBs OR LSBs
TO A
FREQUENCY REGISTER?
NO
YES
Figure 33. Data Write
WRITE TO ANOTHER
PHASE REGISTER?
NO
YES
Rev. C | Page 24 of 36