REV. A

Information furnished by Analog Devices is believed to be accurate and

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

CMOS

Complete DDS

AD9830

© Analog Devices, Inc., 1996

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

Tel: 617/329-4700

Fax: 617/326-8703

FEATURES

+5 V Power Supply

50 MHz Speed

On-Chip SINE Look-Up Table

On-Chip 10-Bit DAC

Parallel Loading

Power-Down Option

72 dB SFDR

250 mW Power Consumption

48-Pin TQFP

APPLICATIONS

DDS Tuning

Digital Demodulation

GENERAL DESCRIPTION

This DDS device is a numerically controlled oscillator em-

ploying 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 50 MHz are supported. Frequency accu-

racy can be controlled to one part in 4 billion. Modulation

is effected by loading registers through the parallel micro-

processor interface.

A power-down pin allows external control of a power-down

mode. The part is available in a 48-pin TQFP package.

FUNCTIONAL BLOCK DIAGRAM

RESET

SLEEP

IOUT

IOUT

COMP

REFIN

FS ADJUST

REFOUT

AGND

AVDD

DGND

DVDD

MCLK

D0

FSELECT

D15

WR

A0

A1

A2

PSEL0

PSEL1

12

AD9830

ON-BOARD

REFERENCE

FULL SCALE

CONTROL

10-BIT DAC

SIN

ROM

PHASE

ACCUMULATOR

(32-BIT)

MUX

MUX

FREQ0 REG

FREQ1 REG

PHASE0 REG

PHASE1 REG

PHASE2 REG

PHASE3 REG

PARALLEL REGISTER

TRANSFER CONTROL

MPU INTERFACE

Σ