Low Power, 12.65 mW, 2.3 V to 5.5 V,

Programmable Waveform Generator

Data Sheet

AD9833

Rev. E

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FEATURES

Digitally programmable frequency and phase

12.65 mW power consumption at 3 V

0 MHz to 12.5 MHz output frequency range

28-bit resolution: 0.1 Hz at 25 MHz reference clock

Sinusoidal, triangular, and square wave outputs

2.3 V to 5.5 V power supply

No external components required

3-wire SPI interface

Extended temperature range: −40°C to +105°C

Power-down option

10-lead MSOP package

Qualified for automotive applications

APPLICATIONS

Frequency stimulus/waveform generation

Liquid and gas flow measurement

Sensory applications: proximity, motion,

and defect detection

Line loss/attenuation

Test and medical equipment

Sweep/clock generators

Time domain reflectometry (TDR) applications

GENERAL DESCRIPTION

The AD9833 is a low power, programmable waveform generator

capable of producing sine, triangular, and square wave outputs.

Waveform generation is required in various types of sensing,

actuation, and time domain reflectometry (TDR) applications.

The output frequency and phase are software programmable,

allowing easy tuning. No external components are needed. The

frequency registers are 28 bits wide: with a 25 MHz clock rate,

resolution of 0.1 Hz can be achieved; with a 1 MHz clock rate,

the AD9833 can be tuned to 0.004 Hz resolution.

The AD9833 is written to via a 3-wire serial interface. This serial

interface operates at clock rates up to 40 MHz and is compatible

with DSP and microcontroller standards. The device operates

with a power supply from 2.3 V to 5.5 V.

The AD9833 has a power-down function (SLEEP). This function

allows sections of the device that are not being used to be powered

down, thus minimizing the current consumption of the part. For

example, the DAC can be powered down when a clock output is

being generated.

The AD9833 is available in a 10-lead MSOP package.

FUNCTIONAL BLOCK DIAGRAM

SERIAL INTERFACE

AND

CONTROL LOGIC

SCLK

SDATA

FSYNC

CONTROL REGISTER

PHASE1 REG

PHASE0 REG

MUX

SIN

ROM

10-BIT DAC

MUX

FREQ0 REG

FREQ1 REG

12

ON-BOARD

REFERENCE

AGND

DGND

VDD

AD9833

PHASE

ACCUMULATOR

(28-BIT)

REGULATOR

CAP/2.5V

2.5V

AVDD/

DVDD

MUX

DIVIDE

BY 2

MSB

MUX

FULL-SCALE

CONTROL

COMP

VOUT

R

200Ω

MCLK

Figure 1.