AD9953PCB datasheet(3/42 Pages) AD

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PRELIMINARY TECHNICAL DATA

AD9953

Frequency Tuning Word 1 (FTW1)

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

RAM

Modes of Operation

Single Tone Mode

RAM Controlled Modes of Operation

Direct Switch Mode

Ramp-Up Mode

Bi-directional Ramp Mode

Continuous Bi-directional Ramp Mode

Continuous Re-circulate Mode

RAM Controlled Modes of Operation Summary

Internal Profile Control

Programming AD9953 Features

Phase Offset Control

Phase/Amplitude Dithering

Shaped On-Off Keying

AUTO Shaped On-Off Keying mode operation:

OSK Ramp Rate Timer

External Shaped On-Off Keying mode operation:

Synchronization; Register Updates (I/O UPDATE)

Functionality of the SyncClk and I/O UPDATE

Figure D- I/O Synchronization Block Diagram

Figure E - I/O Synchronization Timing Diagram

Synchronizing Multiple AD9953s

Using a Single Crystal To Drive Multiple AD9953 Clock Inputs

Serial Port Operation

Instruction Byte

Serial Interface Port Pin Description

MSB/LSB Transqfers

Example Operation

RAM I/O Via Serial Port

Notes on Serial Port Operation

Power Down Functions of the AD9953

REV. PrB 1/30/03

Page 3

Analog Devices, Inc.

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