AD9834 Analog Devices, AD9834 Datasheet - Page 16

• Manufacturer Part Number: AD9834
• Description: +2.5V to +5.5V, 50MHz, Low Power (25mW) Complete DDS With on Board Comparator in 20-pin Tssop Package
• Manufacturer: Analog Devices

AD9834
YES
TO A FREQUENCY REGISTER?
(CONTROL REGISTER WRITE)
WRITE A FULL 28-BIT WORD
FREQUENCY REGISTER?
WRITE ANOTHER FULL
(See Table 7 for Example)
WRITE 2 CONSECUTIVE
DATA WRITE
B28 (D13) = 1
28 BITS TO A
16-BIT WORDS
PRELIMINARY TECHNICAL DATA
NO
YES
(CONTROL REGISTER WRITE)
FSELECT AND PSELECT
SELECT DATA SOURCES
PINS BEING USED?
SET PSEL Bit
SET FSEL Bit
PIN/SW = 0
NO
NO
Figure 10. Selecting Data Sources
Figure 9. Data Writes
TO A FREQUENCY REGISTER?
(CONTROL REGISTER WRITE)
WRITE 14 MSBs OR LSBs
FREQUENCY REGISTER?
WRITE A 16-BIT WORD
WRITE 14 MSBs OR LSBs
(See Tables 8 & 9 for
–16–
HLB (D12) = 0 / 1
B28 (D13) = 0
examples)
YES
TO A
YES
NO
(CONTROL REGISTER WRITE)
AND PSELECT
SET FSELECT
PIN/SW = 1
YES
NO
D15, D14 = 11
D11 ... D0 = Phase Data
WRITE TO PHASE
WRITE TO ANOTHER
D13 = 0/1 (chooses the
PHASE REGISTER?
D12 = X
REGISTER?
(16 - Bit Write)
YES
phase register)
NO
REV PrL
YES