25 MHz Direct Digital Synthesizer,

Waveform Generator

Data Sheet

AD9832

Rev. E

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FEATURES

25 MHz speed

On-chip SIN lookup table

On-chip, 10-bit DAC

Serial loading

Power-down option

Temperature range: −40°C to +85°C

200 mW power consumption

16-Lead TSSOP

APPLICATIONS

Frequency stimulus/waveform generation

Frequency phase tuning and modulation

Low power RF/communications systems

Liquid and gas flow measurement

Sensory applications: proximity, motion, and defect

detection

Test and medical equipment

GENERAL DESCRIPTION

The AD9832 is a numerically controlled oscillator employing

a phase accumulator, a sine look-up table, and a 10-bit digital-

to-analog converter (DAC) 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.

Similar DDS products can be found at www.analog.com/DDS.

FUNCTIONAL BLOCK DIAGRAM

IOUT

COMP

REFIN

FS ADJUST

REFOUT

AGND

AVDD

DGND

DVDD

MCLK

PSEL0 PSEL1

12

AD9832

ON-BOARD

REFERENCE

10-BIT DAC

PHASE0 REG

PHASE1 REG

PHASE2 REG

PHASE3 REG

FULL-SCALE

CONTROL

SIN

ROM

PHASE

ACCUMULATOR

(32 BIT)

FREQ0 REG

FREQ1 REG

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

MUX

MUX

MUX

Figure 1.