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AD9832 Schematic ( PDF Datasheet ) - Analog Devices

Teilenummer AD9832
Beschreibung CMOS Complete DDS
Hersteller Analog Devices
Logo Analog Devices Logo 




Gesamt 30 Seiten
AD9832 Datasheet, Funktion
Data Sheet
25 MHz Direct Digital Synthesizer,
Waveform Generator
AD9832
FEATURES
25 MHz speed
On-chip SIN lookup table
On-chip, 10-bit DAC
Serial loading
Power-down option
Temperature range: −40°C to +85°C
200 mW power consumption
16-Lead TSSOP
APPLICATIONS
Frequency stimulus/waveform generation
Frequency phase tuning and modulation
Low power RF/communications systems
Liquid and gas flow measurement
Sensory applications: proximity, motion, and defect
detection
Test and medical equipment
GENERAL DESCRIPTION
The AD9832 is a numerically controlled oscillator employing
a phase accumulator, a sine look-up table, and a 10-bit digital-
to-analog converter (DAC) 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.
Similar DDS products can be found at www.analog.com/DDS.
MCLK
FSELECT
FUNCTIONAL BLOCK DIAGRAM
DVDD DGND
AVDD AGND
REFOUT FS ADJUST REFIN
FSELECT
BIT
SELSRC
SYNC
ON-BOARD
REFERENCE
FULL-SCALE
CONTROL
FREQ0 REG
FREQ1 REG
PHASE
ACCUMULATOR
(32 BIT)
12 SIN
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
AD9832
SYNC
SYNC
SELSRC
MUX
MUX
DECODE LOGIC
SERIAL REGISTER
CONTROL REGISTER
FSELECT/PSEL REGISTER
PSEL0
BIT
PSEL1
BIT
FSYNC SCLK SDATA
Figure 1.
PSEL0 PSEL1
Rev. E
Document Feedback
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responsibilityisassumedbyAnalogDevices for itsuse,nor foranyinfringementsofpatentsor other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700 ©1999–2013 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com






AD9832 Datasheet, Funktion
AD9832
10nF
RSET
3.9kΩ
REFOUT
ON-BOARD
REFERENCE
REFIN FS
ADJUST
FULL-SCALE
CONTROL
COMP
AVDD
10nF
12
SIN
ROM
10-BIT DAC
IOUT
AD9832
300Ω
50pF
Figure 2. Test Circuit by Which Specifications Were Tested
Data Sheet
Rev. E | Page 4 of 28

6 Page









AD9832 pdf, datenblatt
AD9832
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
START 0Hz
RBW 300Hz
VBW 1kHz
STOP 12.5MHz
ST 277 SEC
Figure 19. fMCLK = 25 MHz, fOUT = 6.1 MHz, Frequency Word = 0x3E76C8B4
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
START 0Hz
RBW 300Hz
VBW 1kHz
STOP 12.5MHz
ST 277 SEC
Figure 20. fMCLK = 25 MHz, fOUT = 7.1 MHz, Frequency Word = 0x48B43958
Data Sheet
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
START 0Hz
RBW 300Hz
VBW 1kHz
STOP 12.5MHz
ST 277 SEC
Figure 21. fMCLK = 25 MHz, fOUT = 8.1 MHz, Frequency Word = 0x52F1A9FC
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
START 0Hz
RBW 300Hz
VBW 1kHz
STOP 12.5MHz
ST 277 SEC
Figure 22. fMCLK = 25 MHz, fOUT = 9.1 MHz, Frequency Word = 0x5D2F1AA0
Rev. E | Page 10 of 28

12 Page





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