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AD9834BRU-REEL

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30P31-P32
20 mW Power, 2.3 V to 5.5 V,
75 MHz Complete DDS
AD9834
Rev. B
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 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.
Trademarks and registered trademarks are the property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700 www.analog.com
Fax: 781.461.3113 ©2003–2010 Analog Devices, Inc. All rights reserved.
FEATURES
Narrow-band SFDR >72 dB
2.3 V to 5.5 V power supply
Output frequency up to 37.5 MHz
Sine output/triangular output
On-board comparator
3-wire SPI® interface
Extended temperature range: −40°C to +105°C
Power-down option
20 mW power consumption at 3 V
20-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 AD9834 is a 75 MHz low power DDS device capable of
producing high performance sine and triangular outputs. It also
has an on-board comparator that allows a square wave to be
produced for clock generation. Consuming only 20 mW of
power at 3 V makes the AD9834 an ideal candidate for power-
sensitive applications.
Capability for phase modulation and frequency modulation is
provided. The frequency registers are 28 bits; with a 75 MHz
clock rate, resolution of 0.28 Hz can be achieved. Similarly, with
a 1 MHz clock rate, the AD9834 can be tuned to 0.004 Hz
resolution. Frequency and phase modulation are affected by
loading registers through the serial interface and toggling the
registers using software or the FSELECT pin and PSELECT pin,
respectively.
The AD9834 is written to using a 3-wire serial interface. This
serial interface operates at clock rates up to 40 MHz and is
compatible with DSP and microcontroller standards.
The device operates with a power supply from 2.3 V to 5.5 V.
The analog and digital sections are independent and can be run
from different power supplies, for example, AVDD can equal
5 V with DVDD equal to 3 V.
The AD9834 has a power-down pin (SLEEP) that allows
external control of the power-down mode. Sections of the
device that are not being used can be powered down to
minimize the current consumption. For example, the DAC can
be powered down when a clock output is being generated.
The part is available in a 20-lead TSSOP.
FUNCTIONAL BLOCK DIAGRAM
12
Σ
MUX
MUX
COMPARATOR
MSB
CAP/2.5VDVDDAGNDAVDD
MCLK
AD9834
FSYNC SCLK SDATA
COMP
IOUT
IOUTB
DGND
REGULATOR
REFOUT FS ADJUST
VIN
FSELECT
12-BIT PHASE0 REG
12-BIT PHASE1 REG
SLEEP RESETPSELECT
MUX
MUX
MUX
SIGN BIT OUT
VCC
2.5V
ON-BOARD
REFERENCE
16-BIT CONTROL
REGISTER
FULL-SCALE
CONTROL
10-BIT
DAC
DIVIDED
BY 2
SIN
ROM
PHASE
ACCUMULATOR
(28-BIT)
28-BIT FREQ0
REG
28-BIT FREQ1
REG
SERIAL INTERFACE
AND
CONTROL LOGIC
02705-001
Figure 1.
AD9834
Rev. B | Page 2 of 32
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications ....................................................................................... 1
General Description ......................................................................... 1
Functional Block Diagram .............................................................. 1
Revision History ............................................................................... 2
Specifications ..................................................................................... 3
Timing Characteristics ................................................................ 5
Absolute Maximum Ratings ............................................................ 6
ESD Caution .................................................................................. 6
Pin Configuration and Function Descriptions ............................. 7
Typical Performance Characteristics ............................................. 9
Terminology .................................................................................... 13
Theory of Operation ...................................................................... 14
Circuit Description ......................................................................... 15
Numerically Controlled Oscillator Plus Phase Modulator ... 15
SIN ROM ..................................................................................... 15
Digital-to-Analog Converter .................................................... 15
Comparator ................................................................................. 15
Regulator ...................................................................................... 16
Functional Description .................................................................. 17
Serial Interface ............................................................................ 17
Powering Up the AD9834 ......................................................... 17
Latency ......................................................................................... 17
Control Register ......................................................................... 17
Frequency and Phase Registers ................................................ 19
Writing to a Frequency Register ............................................... 20
Writing to a Phase Register ....................................................... 20
RESET Function ......................................................................... 20
SLEEP Function .......................................................................... 20
Sign Bit Out Pin .......................................................................... 21
The IOUT and IOUTB Pins ...................................................... 21
Applications ..................................................................................... 22
Grounding and Layout .................................................................. 25
Interfacing to Microprocessors ..................................................... 26
AD9834 to ADSP-21xx Interface ............................................. 26
AD9834 to 68HC11/68L11 Interface ....................................... 26
AD9834 to 80C51/80L51 Interface .......................................... 27
AD9834 to DSP56002 Interface ............................................... 27
Evaluation Board ............................................................................ 28
Using the AD9834 Evaluation Board....................................... 28
Prototyping Area ........................................................................ 28
XO vs. External Clock ................................................................ 28
Power Supply ............................................................................... 28
Bill of Materials ........................................................................... 30
Outline Dimensions ....................................................................... 31
Ordering Guide .......................................................................... 31
REVISION HISTORY
4/10—Rev. A to Rev. B
Changes to Comparator Section ................................................... 15
Added Figure 28 .............................................................................. 16
Changes to Serial Interface Section .............................................. 17
8/06—Rev. 0 to Rev. A
Updated Format .................................................................. Universal
Changed to 75 MHz Complete DDS ................................ Universal
Changes to Features Section............................................................ 1
Changes to Table 1 ............................................................................ 4
Changes to Table 2 ............................................................................ 6
Changes to Table 3 ............................................................................ 8
Added Figure 10, Figures Renumbered Sequentially ................... 9
Added Figure 16 and Figure 17, Figures Renumbered
Sequentially ..................................................................................... 10
Changes to Table 6 .......................................................................... 19
Changes to Writing a Frequency Register Section ..................... 20
Changes to Figure 29 ...................................................................... 21
Changes to Table 19 ....................................................................... 30
Changes to Figure 38 ...................................................................... 28
2/03—Revision 0: Initial Version
AD9834
Rev. B | Page 3 of 32
SPECIFICATIONS
VDD = 2.3 V to 5.5 V, AGND = DGND = 0 V, T
A
= T
MIN
to T
MAX
, R
SET
= 6.8 kΩ, R
LOAD
= 200 Ω for IOUT and IOUTB, unless otherwise noted.
Table 1.
Grade B, Grade C
1
Parameter
2
Min Typ Max Unit Test Conditions/Comments
SIGNAL DAC SPECIFICATIONS
Resolution 10 Bits
Update Rate 75 MSPS
I
OUT
Full Scale
3
3.0 mA
V
OUT
Max 0.6 V
V
OUT
Min 30 mV
Output Compliance
4
0.8 V
DC Accuracy
Integral Nonlinearity ±1 LSB
Differential Nonlinearity ±0.5 LSB
DDS SPECIFICATIONS
Dynamic Specifications
Signal-to-Noise Ratio 55 60 dB f
MCLK
= 75 MHz, f
OUT
= f
MCLK
/4096
Total Harmonic Distortion −66 −56 dBc f
MCLK
= 75 MHz, f
OUT
= f
MCLK
/4096
Spurious-Free Dynamic Range (SFDR)
Wideband (0 to Nyquist) −60 −56 dBc f
MCLK
= 75 MHz, f
OUT
= f
MCLK
/75
Narrow Band (±200 kHz)
B Grade −78 −67 dBc f
MCLK
= 50 MHz, f
OUT
= f
MCLK
/50
C Grade −74 −65 dBc f
MCLK
= 75 MHz, f
OUT
= f
MCLK
/75
Clock Feedthrough −50 dBc
Wake-Up Time 1 ms
COMPARATOR
Input Voltage Range 1 V p-p AC-coupled internally
Input Capacitance 10 pF
Input High-Pass Cutoff Frequency 4 MHz
Input DC Resistance 5 MΩ
Input Leakage Current 10 A
OUTPUT BUFFER
Output Rise/Fall Time 12 ns Using a 15 pF load
Output Jitter 120 ps rms 3 MHz sine wave 0.6 V p-p
VOLTAGE REFERENCE
Internal Reference 1.12 1.18 1.24 V
REFOUT Output Impedance
5
1 kΩ
Reference TC 100 ppm/°C
LOGIC INPUTS
V
INH
, Input High Voltage 1.7 V 2.3 V to 2.7 V power supply
2.0 V 2.7 V to 3.6 V power supply
2.8 V 4.5 V to 5.5 V power supply
V
INL
, Input Low Voltage 0.6 V 2.3 V to 2.7 V power supply
0.7 V 2.7 V to 3.6 V power supply
0.8 V 4.5 V to 5.5 V power supply
I
INH
/I
INL
, Input Current 10 A
C
IN
, Input Capacitance 3 pF
POWER SUPPLIES
AVDD 2.3 5.5 V f
MCLK
= 75 MHz, f
OUT
= f
MCLK
/4096
DVDD 2.3 5.5 V
I
AA
6
3.8 5 mA
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30P31-P32

AD9834BRU-REEL

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Buy AD9834BRU-REEL
Manufacturer:
Analog Devices Inc.
Description:
Data Acquisition ADCs/DACs - Specialized 20mW Power 2.3-5.5V 75MHz
Lifecycle:
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