PRELIMINARY TECHNICAL DATA
AD9833
ABSOLUTE MAXIMUM RATINGS*
(TA = +25°C unless otherwise noted)
Maximum Junction Temperature . . . . . . . . . . . . . . 150°C
µSOIC Package
θJA Thermal Impedance . . . . . . . . . . . . . . . . . . .206°C/W
θJC Thermal Impedance . . . . . . . . . . . . . . . . . . . 44°C/W
Lead Temperature, Soldering (10 sec) . . . . . . . . . 300°C
IR Reflow, Peak Temperature . . . . . . . . . . . . . . . 220°C
VDD to AGND . . . . . . . . . . . . . . . . . . . . . –0.3 V to +6 V
VDD to DGND . . . . . . . . . . . . . . . . . . . . . –0.3 V to +6 V
AGND to DGND. . . . . . . . . . . . . . . . . . –0.3 V to +0.3 V
CAP/2.5V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.75 V
Digital I/O Voltage to DGND . –0.3 V to VDD + 0.3 V
Analog I/O Voltage to AGND . –0.3 V to VDD + 0.3 V
Operating Temperature Range
*Stressesabovethoselistedunder“AbsoluteMaximumRatings”maycausepermanent
damagetothedevice. Thisisastressratingonlyandfunctionaloperationofthedevice
at these or any other conditions above those listed in the operational sections of this
specification is not implied. Exposure to absolute maximum rating conditions for
extendedperiodsmayaffectdevicereliability.
Industrial (B Version) . . . . . . . . . . . . . . –40°C to +85°C
Storage Temperature Range . . . . . . . . . –65°C to +150°C
ORDERING GUIDE
Model
Temperature Range
Package Description
Package Option
AD9833BRM
–40°C to +85°C
14-Pin µSOIC
(Micro Small Outline IC
)
RM-10
EVAL-AD9833EB
Evaluation Board
PIN CONFIGURATION
10
9
1
2
COMP
VDD
VOUT
AGND
FSYNC
SCLK
AD9833
8
7
6
CAP/2.5V
DGND
3
4
5
TOP VIEW
(Not to Scale)
SDATA
MCLK
PIN DESCRIPTION
Pin #
Mnemonic
Function
POWER SUPPLY
2
3
VDD
Positive power supply for the analog section and the digital interface sections. The on board 2.5 V
regulator is also supplied from VDD. VDD can have a value from +2.3 V to +5.5 V. A 0.1 µF and
10 µF decoupling capacitor should be connected between VDD and AGND.
CAP/2.5V The digital circuitry operates from a +2.5 V power supply. This +2.5 V is generated from VDD
using an on board regulator (when VDD exceeds +2.7 V). The regulator requires a decoupling
capacitor of typically 100 nF, which is connected from CAP/2.5V to DGND. If VDD is equal to
or less than +2.7 V, CAP/2.5V should be tied directly to VDD.
4
9
DGND
AGND
Digital Ground.
Analog Ground.
ANALOG SIGNAL AND REFERENCE
1
10
COMP
VOUT
A DAC Bias Pin. This pin is used for de-coupling the DAC bias voltage.
Voltage Output. The analog and digital output from the AD9833 is available at this pin. An
external load resistor is not required as the device has a 200W resistor on board.
DIGITAL INTERFACE AND CONTROL
5
MCLK
Digital Clock Input. DDS output frequencies are expressed as a binary fraction of the frequency of
MCLK. The output frequency accuracy and phase noise are determined by this clock.
Serial Data Input. The 16-bit serial data word is applied to this input.
Serial Clock Input. Data is clocked into the AD9833 on each falling SCLK edge.
Active Low Control Input. This is the frame synchronisation signal for the input data. When
FSYNC is taken low, the internal logic is informed that a new word is being loaded into the
device.
6
7
8
SDATA
SCLK
FSYNC
–4–
REV PrG