AD9834 datasheet(16/20 Pages) AD

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AD9834

–16–

REV PrM

PRELIMINARY TECHNICAL DATA

Figure 9. Data Writes

Figure 10. Selecting Data Sources

DATA WRITE

WRITE A FULL 28-BIT WORD

TO A FREQUENCY REGISTER?

WRITE 14 MSBs OR LSBs

TO A FREQUENCY REGISTER?

WRITE TO PHASE

(CONTROL REGISTER WRITE)

B28 (D13) = 1

WRITE 2 CONSECUTIVE

16-BIT WORDS

(See Table 7 for Example)

WRITE A 16-BIT WORD

(See Tables 8 & 9 for

examples)

(CONTROL REGISTER WRITE)

B28 (D13) = 0

HLB (D12) = 0 / 1

WRITE ANOTHER FULL

28 BITS TO A

FREQUENCY REGISTER?

WRITE 14 MSBs OR LSBs

TO A

FREQUENCY REGISTER?

(16 - Bit Write)

D15, D14 = 11

D13 = 0/1 (chooses the

phase register)

D12 = X

D11 ... D0 = Phase Data

WRITE TO ANOTHER

PHASE REGISTER?

YES

SELECT DATA SOURCES

FSELECT AND PSELECT

PINS BEING USED?

SET FSELECT

AND PSELECT

(CONTROL REGISTER WRITE)

PIN/SW = 0

SET FSEL Bit

SET PSEL Bit

(CONTROL REGISTER WRITE)

PIN/SW = 1

YES

AD9834 Datasheet(PDF) 16 Page - Analog Devices

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