25 MHz Direct Digital Synthesizer,
Waveform Generator
AD9832
Data Sheet
FEATURES
GENERAL DESCRIPTION
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
The AD9832 is a numerically controlled oscillator employing
a phase accumulator, a sine look-up table, and a 10-bit digitalto-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.
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
Similar DDS products can be found at www.analog.com/DDS.
FUNCTIONAL BLOCK DIAGRAM
DVDD
FSELECT
BIT
FSELECT
AVDD
AGND
REFOUT
FS ADJUST
REFIN
SELSRC
ON-BOARD
REFERENCE
MUX
MCLK
DGND
FULL-SCALE
CONTROL
SYNC
FREQ0 REG
12
MUX
PHASE
ACCUMULATO
R
(32 BIT)
FREQ1 REG
SIN
ROM
10-BIT DAC
COMP
IOUT
PHASE0 REG
PHASE1 REG
AD9832
MUX
PHASE2 REG
SYNC
PHASE3 REG
SYNC
16-BIT DATA REGISTER
SYNC
8 LSBs
8 MSBs
DEFER REGISTER
SELSRC
CONTROL REGISTER
DECODE LOGIC
FSELECT/PSEL REGISTER
MUX
PSEL0
BIT
MUX
PSEL1
BIT
FSYNC
SCLK
PSEL0 PSEL1
SDATA
09090-001
SERIAL REGISTER
Figure 1.
Rev. E
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