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FEATURES
3 V/5 V Power Supply
25 MHz Speed
On-Chip SINE Look-Up Table
On-Chip 10-Bit DAC
Serial Loading
Power-Down Option
45 mW Power Consumption
16-Lead TSSOP
APPLICATIONS
DDS Tuning
Digital Demodulation
GENERAL DESCRIPTION
CMOS
Complete DDS
AD9832
The AD9832 is a numerically controlled oscillator employing
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 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.
FUNCTIONAL BLOCK DIAGRAM
DVDD
FSELECT
BIT
DGND
AVDD
AGND
REFOUT
FS ADJUST
REFIN
MCLK
SELSRC
ON-BOARD
REFERENCE
SYNC
FULL-SCALE
CONTROL
COMP
FSELECT
FREQ0 REG
MUX
FREQ1 REG
PHASE
ACCUMULATOR
(32 BIT)
Σ
12
SIN
ROM
10-BIT DAC
IOUT
PHASE0 REG
PHASE1 REG
PHASE2 REG
SYNC
PHASE3 REG
SYNC
16-BIT DATA REGISTER
SYNC
8 MSBs
8 LSBs
DEFER REGISTER
SELSRC
CONTROL REGISTER
DECODE LOGIC
FSELECT/PSEL REGISTER
SERIAL REGISTER
MUX
AD9832
PSEL0
BIT
PSEL1
BIT
FSYNC
SCLK
SDATA
PSEL0 PSEL1
REV. A
Information 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
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
World Wide Web Site: http://www.analog.com
Fax: 781/326-8703
© Analog Devices, Inc., 1999
AD [ ANALOG DEVICES ]
