AD9832_15 Datasheet, PDF (1/28 Pages) Analog Devices – 25 MHz Direct Digital Synthesizer

Data Sheet
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
25 MHz Direct Digital Synthesizer,
Waveform Generator
AD9832
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.
MCLK
FSELECT
FUNCTIONAL BLOCK DIAGRAM
DVDD DGND
AVDD AGND
REFOUT FS ADJUST REFIN
FSELECT
BIT
SELSRC
SYNC
ON-BOARD
REFERENCE
FULL-SCALE
CONTROL
FREQ0 REG
FREQ1 REG
PHASE
ACCUMULATOR
(32 BIT)
12
SIN
ROM
10-BIT DAC
COMP
IOUT
SYNC
PHASE0 REG
PHASE1 REG
PHASE2 REG
PHASE3 REG
16-BIT DATA REGISTER
MUX
8 MSBs 8 LSBs DEFER REGISTER
AD9832
SYNC
SYNC
SELSRC
MUX
MUX
DECODE LOGIC
SERIAL REGISTER
CONTROL REGISTER
FSELECT/PSEL REGISTER
PSEL0
BIT
PSEL1
BIT
FSYNC SCLK SDATA
Figure 1.
PSEL0 PSEL1
Rev. E
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