PRELIMINARY TECHNICAL DATA

AD9953

REV. PrB 1/30/03

Page 2

Analog Devices, Inc.

GENERAL DESCRIPTION

The AD9953 is a Direct Digital Synthesizer (DDS) featuring a

14-bit DAC operating up to 400MSPS. The AD9953 uses

advanced DDS technology, coupled with an internal high-speed,

high performance D/A converter to form a digitally-

programmable, complete high-frequency synthesizer capable of

generating a frequency-agile analog output sinusoidal waveform

at up to 200 MHz. The AD9953 is designed to provide fast

frequency hopping and fine tuning resolution (32-bit frequency

tuning word). The frequency tuning and control words are loaded

into the AD9953 via a serial I/O port. The AD9953 includes an

integrated 1024x32 Static RAM to support flexible frequency

sweep capability in several modes.

The AD9953 is specified to operate over the extended industrial

temperature range of -40° to +85°C.

ABSOLUTE MAXIMUM RATINGS

1

Maximum Junction Temp. ............................. +150 °C

Storage Temperature ................................... -65 °C to +150 °C

Vs ............................................................................ +4 V

Operating Temp. ............................................ -40 °C to +85 °C

Digital Input Voltage............................... -0.7 V to +Vs

Lead Temp. (10 sec. soldering) ................................... +300 °C

Digital Output Current ....................................... 5 mA

15 °C/W

* Absolute maximum ratings are limiting values, to be applied individually, and beyond which the serviceability

of the circuit may be impaired. Functional operability under any of these conditions is not necessarily implied.

Exposure of absolute maximum rating conditions for extended periods of time may affect device reliability.

CONTENTS

Functional Block Diagram

1

GENERAL DESCRIPTION

2

AD9954 PRELIMINARY ELECTRICAL SPECIFICATIONS

4

AD9953 Pinmap

7

Pin Name

8

I/O

8

Component Blocks

10

DDS Core

10

Phase Truncation

11

Clock Input

11

Phase Locked Loop (PLL)

12

DAC Output

12

Serial IO Port

12

Register Maps and Descriptions

13

Control Register Bit Descriptions

16

Control Function Register #1 (CFR1)

16

Control Function Register #2 (CFR2)

Error! Bookmark not defined.

Control Function Register #2 (CFR2)

21

Other Register Descriptions

22

Amplitude Scale Factor (ASF)

22

Amplitude Ramp Rate (ARR)

22

Frequency Tuning Word 0 (FTW0)

23

Phase Offset Word (POW)

23