AD9953ASV 查看數據表（PDF） - Analog Devices

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AD9953ASV

400 MSPS 14-Bit, 1.8V CMOS Direct Digital Synthesizer

Analog Devices 

PRELIMINARY TECHNICAL DATA

AD9953

Frequency Tuning Word 1 (FTW1)

23

RAM Segment Control Words 0,1,2,3 (RSCW0) (RSCW1) (RSCW2), (RSCW3) 23

RAM

23

Modes of Operation

24

Single Tone Mode

24

RAM Controlled Modes of Operation

24

Direct Switch Mode

24

Ramp-Up Mode

25

Bi-directional Ramp Mode

25

Continuous Bi-directional Ramp Mode

26

Continuous Re-circulate Mode

27

RAM Controlled Modes of Operation Summary

28

Internal Profile Control

28

Programming AD9953 Features

30

Phase Offset Control

30

Phase/Amplitude Dithering

30

Shaped On-Off Keying

31

AUTO Shaped On-Off Keying mode operation:

32

OSK Ramp Rate Timer

33

External Shaped On-Off Keying mode operation:

33

Synchronization; Register Updates (I/O UPDATE)

34

Functionality of the SyncClk and I/O UPDATE

34

Figure D- I/O Synchronization Block Diagram

35

Figure E - I/O Synchronization Timing Diagram

35

Synchronizing Multiple AD9953s

36

Using a Single Crystal To Drive Multiple AD9953 Clock Inputs

36

Serial Port Operation

37

Instruction Byte

38

Serial Interface Port Pin Description

39

MSB/LSB Transqfers

39

Example Operation

40

RAM I/O Via Serial Port

40

Notes on Serial Port Operation

41

Power Down Functions of the AD9953

41

REV. PrB 1/30/03

Page 3

Analog Devices, Inc.

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