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Features
- 180 MHz Clock Rate with Selectable 6x Reference Clock Multiplier
- On-Chip High Performance 10-Bit DAC and High Speed Comparator with Hysteresis
- SFDR >43 dB @ 70 MHz AOUT
- 32-Bit Frequency Tuning Word
- 5-Bit Phase Modulation and Offset Capability
- Simplified Control Interface: Parallel or Serial Asynchronous Loading Format
- Comparator Jitter <80 ps p-p @ 20 MHz
- 2.7 V to 5.25 V Single-Supply Operation
- Low Power: 555 mW @ 180 MHz
- Power-Down Function, 4 mW @ 2.7V
- Ultrasmall 28-Lead SSOP Packaging
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The AD9851 is a highly integrated device that uses advanced DDS technology, coupled with an internal high-speed, high performance D/A converter, and comparator, to form a digitally-programmable frequency synthesizer and clock generator function. When referenced to an accurate clock source, the AD9851 generates a stable frequency and phase-programmable digitized analog output sinewave. This sinewave can be used directly as a frequency source, or internally converted to a square wave for agile-clock generator applications.
The AD9851's innovative high-speed DDS core provides a 32-bit frequency tuning word, which results in an output tuning resolution of 40 milli-Hertz, for a 180 MHz reference clock. The AD9851 contains a unique X6 reference clock multiplier circuit that obviates the need for a high-speed reference oscillator. The 6X PLL multiplier has minimal impact on SFDR and phase noise characteristics. The device provides 5-bits of digitally-controlled phase modulation which enables phase shifting of its output in increments of 180°, 90°, 45°, 22.5°, 11.25°, and any combination thereof.
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AD9851
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Application Note 21
AN-851: A WiMax Double Downconversion IF Sampling Receiver Design (Rev.0)
AN-419: A Discrete, Low Phase Noise, 125 MHz Crystal Oscillator for the AD9850
AN-769: Generating Multiple Clock Outputs from the AD9540 (Rev.0)
AN-823: Direct Digital Synthesizers in Clocking Applications Time (Rev.0)
AN-543: High Quality, All-Digital RF Frequency Modulation Generation with the ADSP-2181 and the AD9850 DDS
AN-927: Determining if a Spur is Related to the DDS/DAC or to Some Other Source (For Example, Switching Supplies) (Rev.0)
AN-587: Synchronizing Multiple AD9850/AD9851 DDS-Based Synthesizers (Rev.0)
AN-939: Super-Nyquist Operation of the AD9912 Yields a High RF Output Signal (Rev.0)
AN-605: Synchronizing Multiple AD9852 DDS-Based Synthesizers (Rev.0)
AN-632: Provisionary Data Rates Using the AD9951 DDS as an Agile Reference Clock for the ADN2812 Continuous-Rate CDR (Rev.0)
AN-847: Measuring a Grounded Impedance Profile Using the AD5933 (Rev.A)
AN-280: Mixed Signal Circuit Technologies
AN-843: Measuring a Loudspeaker Impedance Profile Using the AD5933 (Rev.A)
AN-342: Analog Signal-Handling for High Speed and Accuracy
AN-345: Grounding for Low-and-High-Frequency Circuits
AN-237: Choosing DACs for Direct Digital Synthesis
AN-557: An Experimenter’s Project for Incorporating the AD9850 Complete-DDS Device as a Digital LO Function in an Amateur Radio Transceiver*
AN-769: Generating Multiple Clock Outputs from the AD9540
AN-423: Amplitude Modulation of the AD9850 Direct Digital Synthesizer
AN-772: A Design and Manufacturing Guide for the Lead Frame Chip Scale Package (LFCSP)
AN-953: Direct Digital Synthesis (DDS) with a Programmable Modulus
Technical Articles 21
Video Portables and Cameras Get HDMI Outputs
Two DDS ICs Implement Amplitude-shift Keying
400-MSample DDSs Run On Only +1.8 VDC
ADI Buys Korean Mobile TV Chip Maker
The Year of the Waveform Generator
Simple Circuit Controls Stepper Motors
Synchronized Synthesizers Aid Multichannel Systems
Speedy A/Ds Demand Stable Clocks
DDS Device Provides Amplitude Modulation
DDS Applications
Digital Potentiometers Vary Amplitude In DDS Devices
Digital Waveform Generator Provides Flexible Frequency Tuning for Sensor Measurement
DDS Circuit Generates Precise PWM Waveforms
DDS Device Produces Sawtooth Waveform
DDS IC Initiates Synchronized Signals
DDS Design
DDS Simplifies Polar Modulation
DDS IC Plus Frequency-To-Voltage Converter Make Low-Cost DAC
Improved DDS Devices Enable Advanced Comm Systems
Integrated DDS Chip Takes Steps To 2.7 GHz
Basics of Designing a Digital Radio Receiver (Radio 101)
Product Highlight 1
Evaluation Design File 4
Frequently Asked Question 1
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.
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PCN
Aug 25, 2010
- 10_0065
Halogen Free Material Change for SSOP Products at Carsem
AD9851BRS
AD9851BRSZ
AD9851BRSZRL
Feb 8, 2010
- 04_0080
Qualification of the 8" C6 and Q Wafer Fab Processes at Analog Devices, Limerick, Ireland.
AD9851BRS
AD9851BRSZ
AD9851BRSZRL
Filter by Model
Part Models
Product Lifecycle
PCN
Aug 25, 2010
- 10_0065
Halogen Free Material Change for SSOP Products at Carsem
Feb 8, 2010
- 04_0080
Qualification of the 8" C6 and Q Wafer Fab Processes at Analog Devices, Limerick, Ireland.
AD9851BRS
AD9851BRSZ
AD9851BRSZRL
Software & Part Ecosystem
Tools & Simulations 1
ADIsimDDS (Direct Digital Synthesis)
