REV. A

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reliable. However, no responsibility is assumed by Analog Devices for its

use, nor for any infringements of patents or other rights of third parties

which may result from its use. No license is granted by implication or

otherwise under any patent or patent rights of Analog Devices.

a

AD9832

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 781/329-4700

World Wide Web Site: http://www.analog.com

Fax: 781/326-8703

© Analog Devices, Inc., 1999

CMOS

Complete DDS

FUNCTIONAL BLOCK DIAGRAM

IOUT

COMP

REFIN

FS ADJUST

REFOUT

AGND

AVDD

DGND

DVDD

MCLK

PSEL0 PSEL1

12

Σ

AD9832

ON-BOARD

REFERENCE

10-BIT DAC

PHASE0 REG

PHASE1 REG

PHASE2 REG

PHASE3 REG

FULL-SCALE

CONTROL

SIN

ROM

PHASE

ACCUMULATOR

(32 BIT)

MUX

FREQ0 REG

FREQ1 REG

MUX

16-BIT DATA REGISTER

SYNC

FSELECT

FSELECT

BIT

SELSRC

SYNC

8 LSBs

8 MSBs

DECODE LOGIC

FSYNC

SCLK

SDATA

SERIAL REGISTER

CONTROL REGISTER

FSELECT/PSEL REGISTER

DEFER REGISTER

SYNC

SYNC

SELSRC

PSEL0

BIT

PSEL1

BIT

FEATURES

3 V/5 V Power Supply

25 MHz Speed

On-Chip SINE Look-Up Table

On-Chip 10-Bit DAC

Serial Loading

Power-Down Option

45 mW Power Consumption

16-Lead TSSOP

APPLICATIONS

DDS Tuning

Digital Demodulation

GENERAL DESCRIPTION

The AD9832 is a numerically controlled oscillator employing

a phase accumulator, a sine look-up table and a 10-bit D/A

converter integrated on a single CMOS chip. Modulation

capabilities are provided for phase modulation and frequency

modulation.

Clock rates up to 25 MHz are supported. Frequency accuracy

can be controlled to one part in 4 billion. Modulation is effected

by loading registers through the serial interface.

A power-down bit allows the user to power down the AD9832

when it is not in use, the power consumption being reduced to

5 mW (5 V) or 3 mW (3 V). The part is available in a 16-lead

TSSOP package.