AD9831_15 Datasheet, PDF (1/16 Pages) Analog Devices – DIRECT DIGITAL SYNTHESIZER

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DIRECT DIGITAL SYNTHESIZER,
WAVEFORM GENERATOR
AD9831
FEATURES
3 V/5 V Power Supply
25 MHz Speed
On-Chip SINE Look-Up Table
On-Chip 10-Bit DAC
Parallel Loading
Powerdown Option
72 dB SFDR
125 mW (5 V) Power Consumption
40 mW (3 V) Power Consumption
48-Pin LQFP
APPLICATIONS
DDS Tuning
Digital Demodulation
MCLK
FSELECT
FREQ0 REG
FREQ1 REG
GENERAL DESCRIPTION
This DDS device is a numerically controlled oscillator employ-
ing a phase accumulator, a sine look-up table and a 10-bit D/A
converter 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 parallel microprocessor
interface.
A powerdown pin allows external control of a powerdown
mode. The part is available in a 48-pin LQFP package.
Similar DDS products can be found at
http://www.analog.com/DDS.
FUNCTIONAL BLOCK DIAGRAM
DVDD DGND
AVDD AGND
REFOUT FS ADJUST REFIN
ON-BOARD
REFERENCE
FULL-SCALE
CONTROL
COMP
MUX
PHASE
ACCUMULATOR
(32-BIT)
12
Σ
SIN
ROM
10-BIT DAC
IOUT
PHASE0 REG
PHASE1 REG
PHASE2 REG
PHASE3 REG
MUX
AD9831
PARALLEL REGISTER
TRANSFER CONTROL
MPU INTERFACE
SLEEP
RESET
D0
D15
WR A0 A1 A2
PSEL0 PSEL1
REV. B
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use, nor for any infringements of patents or other rights of third parties
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
© Analog Devices, Inc., 2011
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