AD9834 Analog Devices, AD9834 Datasheet
AD9834
Manufacturer Part Number
AD9834
Description
+2.5V to +5.5V, 50MHz, Low Power (25mW) Complete DDS With on Board Comparator in 20-pin Tssop Package
Manufacturer
Analog Devices
Datasheet
1.AD9834.pdf
(20 pages)
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REV PrL 04/02
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.
Preliminary Technical Data
FEATURES
+2.3 V to +5.5 V Power Supply
50 MHz Speed
Low Jitter Clock Output
Sine Output/Triangular Output
Serial Loading
Power-Down Option
Narrowband SFDR > 72 dB
20 mW Power Consumption at 3 V
20-Pin TSSOP
APPLICATIONS
Test Equipment
Slow Sweep Generator
DDS Tuning
Digital Modulation
GENERAL DESCRIPTION
The AD9834 is a numerically controlled oscillator
employing a phase accumulator, a SIN ROM and a
10-bit D/A converter integrated on a single CMOS
chip. Clock rates up to 50 MHz are supported with a
power supply from 2.3 V to 5.5 V.
FSELECT
MCLK
FSYNC
FREQ0 REG
FREQ1 REG
AVDD
28 Bit
28 Bit
Serial Interface
Control Logic
SCLK
AGND
&
PRELIMINARY TECHNICAL DATA
MUX
SDATA
DGND
12 Bit PHASE0 REG
12 Bit PHASE1 REG
Regulator
16 Bit Control
DVDD
Register
Accumulator
(28 Bit)
Phase
FUNCTIONAL BLOCK DIAGRAM
CAP/2.5V
PSELECT
MUX
VCC
2.5V
Low Power, +2.3 V to +5.5 V, 50 MHz
12
Capability for phase modulation and frequency modula-
tion is provided.
one part in 0.25 billion. Modulation is effected by loading
registers through the serial interface.
The AD9834 offers the user a variety of output
waveforms. The SIN ROM can be bypassed so that a
linear up/down ramp is output from the DAC. If the SIN
ROM is not by-passed, a sinusoidal output is available.
Also, if a clock output is required, the MSB of the DAC
data can be output, or the on-chip comparator can be
used.
The digital section is driven by an on-board regulator
which steps down the applied DVDD to +2.5 V when
DVDD exceeds +2.5 V.
are independent and can be run from different power
supplies e.g. AVDD can equals 5 V with DVDD equal to
3 V, etc.
The AD9834 has a power-down pin (SLEEP) which
allows external control of a power-down mode. Sections of
the device which are not being used can be powered down to
minimise the current consumption e.g. the DAC can be
powered down when a clock output is being generated.
The part is available in a 20-pin TSSOP package.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106,U.S.A.
Tel: 781/329-4700
Fax: 781/326-8703
SLEEP
MUX
MUX
ROM
SIN
RESET
On-Board
Reference
DIV BY
2
MUX
Frequency accuracy can be controlled to
REFOUT
MSB
AD9834
COMPARATOR
The analog and digital sections
FullScale
Control
10-Bit
DAC
FS ADJUST
Complete DDS
© Analog Devices, Inc., 2002
AD9834
www.analog.com
COMP
IOUT
IOUTB
SIGN BIT OUT
VIN
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