AD9835 Datasheet, PDF (1/16 Pages) Analog Devices – 50 MHz CMOS Complete DDS

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FEATURES
5 V Power Supply
50 MHz Speed
On-Chip COS Look-Up Table
On-Chip 10-Bit DAC
Serial Loading
Power-Down Option
200 mW Power Consumption
16-Lead TSSOP
APPLICATIONS
DDS Tuning
Digital Demodulation
50 MHz CMOS
Complete DDS
AD9835
GENERAL DESCRIPTION
The AD9835 is a numerically controlled oscillator employing
a phase accumulator, a COS 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 50 MHz are supported. Frequency accuracy
can be controlled to one part in 4 billion. Modulation is ef-
fected by loading registers through the serial interface. A
power-down bit allows the user to power down the AD9835 when
it is not in use, the power consumption being reduced to 1.75 mW.
The part is available in a 16-lead TSSOP package.
MCLK
FSELECT
FUNCTIONAL BLOCK DIAGRAM
DVDD DGND
AVDD AGND
REFOUT FS ADJUST REFIN
FSELECT
BIT
SELSRC
FREQ0 REG
FREQ1 REG
SYNC
MUX
PHASE
ACCUMULATOR
(32 BIT)
ON-BOARD
REFERENCE
FULL-SCALE
CONTROL
12
Σ
COS
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
AD9835
SYNC
SYNC
SELSRC
DECODE LOGIC
SERIAL REGISTER
CONTROL REGISTER
FSELECT/PSEL REGISTER
PSEL0
BIT
PSEL1
BIT
FSYNC SCLK SDATA
PSEL0 PSEL1
REV. 0
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use, nor for any infringements of patents or other rights of third parties
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© Analog Devices, Inc., 1998