Low Power, 12.65 mW, 2.3 V to 5.5 V,
Programmable Waveform Generator
Enhanced Product
Informat
ion 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 that may result from its use. Specifications subject to change without notice. No
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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
Power-down option
10-lead MSOP package
Enhanced product features
Supports defense and aerospace applications (AQEC)
Temperature range: −55°C to +125°C
Controlled manufacturing baseline
1 assembly/test site
1 fabrication site
Enhanced product change notification
Qualification data available upon request
APPLICATIONS
Frequency stimulus/waveform generation
Liquid and gas flow measurement
Sensory applications: proximity, motion, defect detection
Line loss/attenuation
Test and medical equipment
Sweep/clock generators
Time domain reflectometry (TDR) applications
GENERAL DESCRIPTION
The AD9833-EP 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 pro-
grammable, allowing easy tuning. No external components are
needed. The frequency registers are 28 bits wide. With a 25 MHz
clock rate, a resolution of 0.1 Hz can be achieved; with a 1 MHz
clock rate, the AD9833-EP can be tuned to 0.004 Hz resolution.
The AD9833-EP 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-EP 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-EP is available in a 10-lead MSOP package.
Additional application and technical information can be found
in the AD9833 data sheet.
FUNCTIONAL BLOCK DIAGRAM
SERIAL INTERFACE
AND
CONTROL LOGIC
SCLK SDATAFSYNC
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-EP
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
11545-001
Figure 1.
