AD9838 データシートの表示（PDF） - Analog Devices

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AD9838

Mixed-Signal Front-End (MxFE) Processor for Broadband Communications

Analog Devices 

DATA WRITE

AD9838

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 12 FOR EXAMPLE)

WRITE A 16-BIT WORD

(SEE TABLE 13 AND TABLE 14

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 WORD TO A

FREQUENCY REGISTER?

NO

WRITE 14 MSBs OR LSBs

TO A

FREQUENCY REGISTER?

NO

YES

Figure 26. Flowchart for Data Writes

WRITE TO ANOTHER

PHASE REGISTER?

NO

YES

SELECT DATA SOURCES

FSELECT AND PSELECT

PINS BEING USED?

YES

SET FSELECT AND

PSELECT PINS

NO

(CONTROL REGISTER WRITE)

PIN/SW = 0

SET FSEL BIT

SET PSEL BIT

(CONTROL REGISTER WRITE)

PIN/SW = 1

Figure 27. Flowchart for Selecting Data Sources

Rev. A | Page 23 of 32

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