ANALOG DEVICES AD9833 Service Manual

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PRELIMINAR Y TECHNICAL DA T A

+2.5 V to +5.5 V, 25 MHz Low Power

=

CMOS Complete DDS

Preliminary Technical Data AD9833

FEATURES
+2.3 V to +5.5 V Power Supply
25 MHz Speed
Tiny 10-Pin

µµ

µSOIC Package

µµ

Serial Loading
Sinusoidal/Triangular DAC Output
Power-Down Option
Narrowband SFDR > 72 dB
20 mW Power Consumption at 3 V

APPLICATIONS
Digital Modulation
Portable Equipment
Test Equipment
DDS Tuning

GENERAL DESCRIPTION

This low power DDS device 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 25 MHz are supported

with a power supply from +2.3 V to +5.5 V.
Capability for phase modulation and frequency modula-

tion is provided. Frequency accuracy can be controlled to
one part in 0.25 billion. Modulation is effected by loading
registers through the serial interface.

The AD9833 offers a variety of output waveforms from
the VOUT pin. 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.

The digital section is internally operated at +2.5 V, irre­spective of the value of VDD, by an on board regulator
which steps down VDD to +2.5 V, when VDD exceeds
+2.5 V.

The AD9833 has a power-down function (SLEEP). This
allows sections of the device which are not being used to
be powered down, thus minimising the current consump­tion of the part e.g the DAC can be powered down when a
clock output is being generated.

The AD9833 is available in a 10-pin µSOIC package.

FUNCTIONAL BLOCK DIAGRAM

CAP/2.5V

2.5V

Phase

Accumulator

(28 Bit)

Σ

MUX

MCLK

AGND

FREQ0 REG

FREQ1 REG

FSYNC

DGND

AVDD/
DVDD

MUX

Serial Interface

&

Control Logic

SCLK

SDATA

VDD

Regulator

PHASE0 REG

PHASE1 REG

Control Register

REV PrG 02/02

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.

On-Board
Reference

FullScale

Control

12

DIV BY

2

SIN

ROM

MUX

MUX

MSB

10-Bit DAC

200

R

Ω

COMP

VOUT

AD9833

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106,U.S.A.
Tel: [phone] www.analog.com
Fax: [phone] © Analog Devices, Inc., 2002

PRELIMINAR Y TECHNICAL DA TA

AD9833

= 6.8 k

ΩΩ

Ω for

ΩΩ

SPECIFICATIONS

1

(VDD = +2.3 V to +5.5 V; AGND = DGND = 0 V; TA = T

MIN

to T

MAX

; R

SET

VOUT unless otherwise noted)

Parameter Min Typ Max Units Test Conditions/Comments

SIGNAL DAC SPECIFICATIONS

Resolution 10 Bits
Update Rate (f
Output Compliance

) 25 MSPS

MAX

2

0.8 V

DC Accuracy:

Integral Nonlinearity ±1 LSB
Differential Nonlinearity ±0.5 LSB

DDS SPECIFICATIONS
Dynamic Specifications:

Signal to Noise Ratio 50 dB f

Total Harmonic Distortion -53 dBc f

= 25 MHz, f

MCLK

= 25 MHz, f

MCLK

= 1.5 kHz

OUT

= 1.5 kHz

OUT

Spurious Free Dynamic Range (SFDR):

Wideband (± 2 MHz) 50 dBc f

55 dBc f

NarrowBand (± 50 kHz) 72 dBc f

75 dBc f

= 25 MHz, f

MCLK

= 25 MHz, f

MCLK

= 25 MHz, f

MCLK

= 25 MHz, f

MCLK

= f

OUT

= 0.5 MHz

OUT

= f

OUT

= 0.5 MHz

OUT

MCLK

MCLK

/3

/3

Clock Feedthrough –55 dBc

Wake Up Time 1 ms

OUTPUT BUFFER

Output Rise/Fall Time 20 ns Using a 15 pF Load
Output Jitter 100 ps rms When DAC data MSB is output

VOLTAGE REFERENCE

Internal Reference 1.116 1.2 1.284 V 1.2 V ± 7%

LOGIC INPUTS

V

, Input High Voltage VDD –0.9 V +3.6 V to +5.5 V Power Supply

INH

- 0.5 V +2.7 V to +3.6 V Power Supply

V

DD

2 V +2.3 V to + 2.7 V Power Supply

V

, Input Low Voltage 0.9 V +3.6 V to +5.5 V Power Supply

INL

0.5 V +2.3 V to + 3.6 V Power Supply

, Input Current 1 µA

I

INH

CIN, Input Capacitance 10 pF

POWER SUPPLIES f

VDD 2.3 5.5 V

3

I

AA

3

I

DD

I

AA

Low Power Sleep Mode

NOTES

1

Operating temperature range is as follows: B Version: –40°C to +85°C; typical specifications are at 25ⴗC

2

Guaranteed by Design.

3

Measured with the digital inputs static and equal to 0 V or DVDD.

Specifications subject to change without notice. There is 95% test coverage of the digital circuitry.

+ I

DD

3

3

1 + 0.04/MHz mA
7 10 mA 3 V Power Supply
10 15 mA 5 V Power Supply

0.25 mA DAC and Internal Clock Powered Down

5mA

= 25 MHz, f

MCLK

OUT

= f

MCLK

/7

–2– REV PrG

PRELIMINAR Y TECHNICAL DA T A

AD9833

100nF

Figure 1. Test Circuit With which Specifications are tested.

TIMING CHARACTERISTICS

Parameter Limit at T

t

1

t

2

t

3

t

4

t

5

t

6

t

7

t

8

t

9

t

10

1

Guaranteed by design, not production tested.

40 ns min MCLK Period
16 ns min MCLK High Duration
16 ns min MCLK Low Duration
25 ns min SCLK Period
10 ns min SCLK High Duration
10 ns min SCLK Low Duration
5 ns min FSYNC to SCLK Falling Edge Setup Time
10 ns min FSYNC to SCLK Hold Time

- 5 ns max

t

4

5 ns min Data Setup Time
3 ns min Data Hold Time

MIN

to T

MAX

VDD

10nF

CAP/2.5V

REGULATOR

12

SIN

ROM

COMP

10-BIT DAC

VOUT

20pF

AD9833

1

(VDD = +2.3 V to +5.5 V; AGND = DGND = 0 V, unless otherwise noted)

Units Test Conditions/Comments

t

1

MCLK

t

2

t

3

Figure 2. Master Clock

t

t

5

4

SCLK

FSYNC

SDATA

t

7

D15 D14 D2 D1 D0 D15 D14

t

6

t

10

t

9

t

8

Figure 3. Serial Timing

CAUTION

ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily
accumulate on the human body and test equipment and can discharge without detection.
Although the AD9833 features proprietary ESD protection circuitry, permanent damage may
occur on devices subjected to high energy electrostatic discharges. Therefore, proper ESD
precautions are recommended to avoid performance degradation or loss of functionality.

REV PrG

–3–

PRELIMINAR Y TECHNICAL DA TA

AD9833

ABSOLUTE MAXIMUM RATINGS*

(TA = +25°C unless otherwise noted)

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

Industrial (B Version) . . . . . . . . . . . . . .–40°C to +85°C

Maximum Junction Temperature . . . . . . . . . . . . . . 150°C

µSOIC Package

Thermal Impedance . . . . . . . . . . . . . . . . . . .206°C/W

θ

JA

θ

Thermal Impedance . . . . . . . . . . . . . . . . . . .44°C/W

JC

Lead Temperature, Soldering (10 sec) . . . . . . . . . 300°C

IR Reflow, Peak Temperature . . . . . . . . . . . . . . . 220°C

*Stresses above those listed under “Absolute Maximum Ratings” may cause permanent

damage to the device. This is a stress rating only and functional operation of the device
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
extended periods may affect device reliability.

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

COMP

VDD

CAP/2.5V

DGND

MCLK

1
2

AD9833

3

TOP VIEW

(Notto Scale)

4

5

10

VOUT

9

AGND

8

FSYNC

7

SCLK

6

SDATA

PIN DESCRIPTION

Pin # Mnemonic Function

POWER SUPPLY

2 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.

3 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 DGND Digital Ground.
9 AGND Analog Ground.

ANALOG SIGNAL AND REFERENCE

1 COMP A DAC Bias Pin. This pin is used for de-coupling the DAC bias voltage.
10 VOUT 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.

6 SDATA Serial Data Input. The 16-bit serial data word is applied to this input.

7 SCLK Serial Clock Input. Data is clocked into the AD9833 on each falling SCLK edge.
8 FSYNC 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.

–4– REV PrG

PRELIMINAR Y TECHNICAL DA T A

Typical Performance Characteristics

AD9833

TBD

TPC 1. Typical Current Consumption

vs. MCLK Frequency

TBD

TPC 4. Wide Band SFDR vs. f

for Various MCLK Frequencies

OUT/fMCLK

TBD

TPC 2. Narrow Band SFDR vs. MCLK

Frequency

TBD

TPC 5. SNR vs. MCLK Frequency

TBD

TPC 3. Wide Band SFDR vs. MCLK

Frequency

TBD

TPC 6. SNR vs. f
Various MCLK Frequencies

OUT/fMCLK

for

TPC 7. Wake-Up Time vs.

REV PrG

TBD

Temperature

–5–

PRELIMINAR Y TECHNICAL DA TA

AD9833

Typical Performance Characteristics

TBD

TPC 9. f

Frequency Word = 000FBA9

= 10 MHz; f

MCLK

OUT

TBD

TPC 12. f

Frequency Word =

= 25 MHz; f

MCLK

= 2.4 kHz;

= 6 kHz;

OUT

000FBA9

TBD

TPC 10. f

Frequency Word = 2492492

= 10 MHz; f

MCLK

= f

MCLK

/7 ;

TBD

TPC 13. f

Frequency Word =

= 25 MHz; f

MCLK

= 1.43 kHz

OUT

= 60 kHz;

OUT

009D495

TBD

TPC 11. f

Frequency Word = 5555555

= 10 MHz; f

MCLK

= f

MCLK

/3 ;

TBD

TPC 14. f

Frequency Word =

= 25 MHz; f

MCLK

= 3.33 kHz

OUT

= 600 kHz;

OUT

0624DD3

TBD

TPC 15. f

f

Frequency Word =

OUT

= 25 MHz;

MCLK

= 2.4 MHz;

189374D

TBD

TPC 16. f

f

= 3.857 MHz = f

OUT

Frequency Word = 277EE4F

= 25 MHz;

MCLK

–6– REV PrG

MCLK

/7 ;

TBD

TPC 17. f

f

= 8.333 MHz = f

OUT

Frequency Word = 555475C

= 25 MHz;

MCLK

MCLK

/3 ;