AD9951 Datasheet PDF - Analog Devices

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AD9951
Analog Devices

Part Number AD9951
Description CMOS Direct Digital Synthesize
Page 30 Pages


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Data Sheet
400 MSPS 14-Bit, 1.8 V CMOS
Direct Digital Synthesize
AD9951
FEATURES
Phase-locked loop (PLL) REFCLK multiplier (4× to 20×)
400 MSPS internal clock speed
Integrated 14-bit digital-to-analog converter (DAC)
32-bit tuning word
Internal oscillator; can be driven by a single crystal
Phase modulation capability
Multichip synchronization
Phase noise ≤ −120 dBc/Hz at 1 kHz offset (DAC output)
Excellent dynamic performance
>80 dB SFDR at 160 MHz (±100 kHz offset) AOUT
Serial I/O control
1.8 V power supply
Software and hardware controlled power down
APPLICATIONS
Agile local oscillator (LO) frequency synthesis
Programmable clock generators
Test and measurement equipment
Acousto-optic device drivers
48-lead TQFP/EP package
Support for 5 V input levels on most digital inputs
FUNCTIONAL BLOCK DIAGRAM
DDS CORE
PHASE
ACCUMULATOR
Z–1
32
PHASE
OFFSET
19
COS(X)
AD9951
14 DAC
14
SYSTEM
CLOCK
Z–1
DAC_RSET
IOUT
IOUT
32 14
I/O UPDATE
SYNC_CLK
REFCLK
REFCLK
0
M
U
X
SYNC
OSCILLATOR/BUFFER
ENABLE
4× TO 20×
CLOCK
MULTIPLIER
TIMING AND CONTROL LOGIC
÷ 4 CONTROL REGISTERS
M
U
X
SYSTEM
CLOCK
SYNC_IN
OSK
PWRDWNCTL
CRYSTAL OUT
I/O PORT
Figure 1.
RESET
Rev. B
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AD9951* Product Page Quick Links
Last Content Update: 11/01/2016
Comparable Parts
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Documentation
Application Notes
• AN-237: Choosing DACs for Direct Digital Synthesis
• AN-280: Mixed Signal Circuit Technologies
• AN-342: Analog Signal-Handling for High Speed and
Accuracy
• AN-345: Grounding for Low-and-High-Frequency Circuits
• AN-419: A Discrete, Low Phase Noise, 125 MHz Crystal
Oscillator for the AD9850
• AN-423: Amplitude Modulation of the AD9850 Direct
Digital Synthesizer
• AN-543: High Quality, All-Digital RF Frequency
Modulation Generation with the ADSP-2181 and the
AD9850 DDS
• AN-557: An Experimenter's Project:
• AN-587: Synchronizing Multiple AD9850/AD9851 DDS-
Based Synthesizers
• AN-605: Synchronizing Multiple AD9852 DDS-Based
Synthesizers
• AN-621: Programming the AD9832/AD9835
• AN-632: Provisionary Data Rates Using the AD9951 DDS
as an Agile Reference Clock for the ADN2812 Continuous-
Rate CDR
• AN-769: Generating Multiple Clock Outputs from the
AD9540
• AN-823: Direct Digital Synthesizers in Clocking
Applications Time
• AN-837: DDS-Based Clock Jitter Performance vs. DAC
Reconstruction Filter Performance
• AN-851: A WiMax Double Downconversion IF Sampling
Receiver Design
• AN-927: Determining if a Spur is Related to the DDS/DAC
or to Some Other Source (For Example, Switching
Supplies)
• AN-939: Super-Nyquist Operation of the AD9912 Yields a
High RF Output Signal
• AN-953: Direct Digital Synthesis (DDS) with a
Programmable Modulus
Data Sheet
• AD9951: 400 MSPS 14-Bit, 1.8V CMOS Direct Digital
Synthesizer Data Sheet
Product Highlight
• Introducing Digital Up/Down Converters: VersaCOMM™
Reconfigurable Digital Converters
Technical Books
• A Technical Tutorial on Digital Signal Synthesis, 1999



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Tools and Simulations
• ADIsimDDS (Direct Digital Synthesis)
Reference Materials
Product Selection Guide
• RF Source Booklet
Technical Articles
• 400-MSample DDSs Run On Only +1.8 VDC
• ADI Buys Korean Mobile TV Chip Maker
• Basics of Designing a Digital Radio Receiver (Radio 101)
• Clock Requirements For Data Converters
• DDS Applications
• DDS Circuit Generates Precise PWM Waveforms
• DDS Design
• DDS Device Produces Sawtooth Waveform
• DDS Device Provides Amplitude Modulation
• DDS IC Initiates Synchronized Signals
• DDS IC Plus Frequency-To-Voltage Converter Make Low-
Cost DAC
• DDS Simplifies Polar Modulation
• Digital Potentiometers Vary Amplitude In DDS Devices
• Digital Up/Down Converters: VersaCOMM™ White Paper
• Digital Waveform Generator Provides Flexible Frequency
Tuning for Sensor Measurement
• Improved DDS Devices Enable Advanced Comm Systems
• Integrated DDS Chip Takes Steps To 2.7 GHz
• Simple Circuit Controls Stepper Motors
• Speedy A/Ds Demand Stable Clocks
• Synchronized Synthesizers Aid Multichannel Systems
• The Year of the Waveform Generator
• Two DDS ICs Implement Amplitude-shift Keying
• Video Portables and Cameras Get HDMI Outputs
Design Resources
• AD9951 Material Declaration
• PCN-PDN Information
• Quality And Reliability
• Symbols and Footprints
Discussions
View all AD9951 EngineerZone Discussions
Sample and Buy
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Technical Support
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number
* This page was dynamically generated by Analog Devices, Inc. and inserted into this data sheet. Note: Dynamic changes to
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AD9951
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications....................................................................................... 1
Functional Block Diagram .............................................................. 1
Revision History ............................................................................... 2
General Description ......................................................................... 3
AD9951—Electrical Specifications ................................................ 4
Absolute Maximum Ratings............................................................ 6
ESD Caution.................................................................................. 6
Pin Configuration and Function Descriptions............................. 7
Typical Performance Characteristics ............................................. 9
Theory of Operation ...................................................................... 12
REVISION HISTORY
3/16—Rev. A to Rev. B
Changes to Example Operation Section...................................... 22
Changes to Ordering Guide .......................................................... 25
5/09—Rev. 0 to Rev. A
Changes to Figure 1.......................................................................... 1
Changes to Absolute Maximum Ratings Section......................... 7
Changes to Table 3............................................................................ 8
Changes to Table 5.......................................................................... 14
Data Sheet
Component Blocks..................................................................... 12
Modes of Operation ................................................................... 17
Programming AD9951 Features .............................................. 17
Serial Port Operation................................................................. 20
Instruction Byte .......................................................................... 22
Serial Interface Port Pin Description....................................... 22
MSB/LSB Transfers .................................................................... 22
Suggested Application Circuits..................................................... 24
Outline Dimensions ....................................................................... 25
Ordering Guide .......................................................................... 25
Changes to Figure 19...................................................................... 19
Changes to Figure 20...................................................................... 20
Changes to Serial Port Operation Section .................................. 20
Changes to Serial Interface Port Pin Description Section ........ 22
Changes to Figure 27...................................................................... 24
Updated Outline Dimensions....................................................... 25
Changes to Ordering Guide .......................................................... 25
11/03—Revision 0: Initial Version
Rev. B | Page 2 of 28



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