AD9851 180 MHz Complete DDS synthesizer

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.

Features and Benefits
  • 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
  • Simplified Control Interface: Parallel or Serial Asynchronous Loading Format
  • 5-Bit Phase Modulation and Offset Capability
  • 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
RF & Microwave
Data Sheets
Documentnote
AD9851: CMOS 180 MHz DDS/DAC Synthesizer Data Sheet (Rev. D)PDF 742 kB
Application Notes
Documentnote
AN-1389: Recommended Rework Procedure for the Lead Frame Chip Scale Package (LFCSP) (Rev. 0)PDF 133.7 K
AN-769: Generating Multiple Clock Outputs from the AD9540 (Rev. 0)PDF 0
AN-939: Super-Nyquist Operation of the AD9912 Yields a High RF Output Signal (Rev. 0)PDF 221 kB
AN-837: DDS-Based Clock Jitter Performance vs. DAC Reconstruction Filter Performance (Rev. 0)PDF 313 kB
AN-621: Programming the AD9832/AD9835PDF 202 kB
AN-557: An Experimenter's Project: (Rev. 0)PDF 368 kB
AN-419: A Discrete, Low Phase Noise, 125 MHz Crystal Oscillator for the AD9850PDF 101 kB
AN-237: Choosing DACs for Direct Digital SynthesisPDF 1156 kB
AN-423: Amplitude Modulation of the AD9850 Direct Digital SynthesizerPDF 37 kB
AN-345: Grounding for Low-and-High-Frequency CircuitsPDF 455 kB
AN-342: Analog Signal-Handling for High Speed and AccuracyPDF 468 kB
AN-823: Direct Digital Synthesizers in Clocking Applications Time (Rev. 0)PDF 115 kB
AN-280: Mixed Signal Circuit TechnologiesPDF 2101 kB
AN-605: Synchronizing Multiple AD9852 DDS-Based Synthesizers (Rev. 0)PDF 527 kB
AN-927: Determining if a Spur is Related to the DDS/DAC or to Some Other Source (For Example, Switching Supplies) (Rev. 0)PDF 170 kB
AN-587: Synchronizing Multiple AD9850/AD9851 DDS-Based Synthesizers (Rev. 0)PDF 116 kB
AN-953: Direct Digital Synthesis (DDS) with a Programmable Modulus (Rev. B)PDF 112 kB
AN-843: Measuring a Loudspeaker Impedance Profile Using the AD5933 (Rev. A)PDF 284 kB
AN-772: A Design and Manufacturing Guide for the Lead Frame Chip Scale Package (LFCSP) (Rev. 0)PDF 439 kB
AN-851: A WiMax Double Downconversion IF Sampling Receiver Design (Rev. 0)PDF 262 kB
AN-847: Measuring a Grounded Impedance Profile Using the AD5933 (Rev. A)PDF 294 kB
AN-632: Provisionary Data Rates Using the AD9951 DDS as an Agile Reference Clock for the ADN2812 Continuous-Rate CDR (Rev. 0)PDF 138 kB
AN-543: High Quality, All-Digital RF Frequency Modulation Generation with the ADSP-2181 and the AD9850 DDS
AN-543 - Monaural FM Transmitter AN-543 - Stereo FM Transmitter		PDF 49.25 K
Product Highlight
Documentnote
Introducing Digital Up/Down Converters: VersaCOMM™ Reconfigurable Digital ConvertersPDF 63 kB
Technical Books
Documentnote
Frequently Asked Questions
Documentnote
Order Information
Part NumberPackagePacking QtyTemp RangePrice 100-499Price 1000+RoHS
AD9851BRS Production28 ld SSOPOTH 47-40 to 85C19.3616.45N
AD9851BRSRL Production28 ld SSOPREEL 1500-40 to 85C016.45N
AD9851BRSZ Production28 ld SSOPOTH 47-40 to 85C16.1413.56Y
AD9851BRSZRL Production28 ld SSOPREEL 1500-40 to 85C013.56Y
Reference Materials
AD9851: CMOS 180 MHz DDS/DAC Synthesizer Data Sheet (Rev. D) ad9851
AN-1389: 引线框芯片级封装(LFCSP)的建议返修程序 (Rev. 0) ad9540
AN-1389: Recommended Rework Procedure for the Lead Frame Chip Scale Package (LFCSP) (Rev. 0) ad9856
AN-769: Generating Multiple Clock Outputs from the AD9540 (Rev. 0) ad9540
AN-939: Super-Nyquist Operation of the AD9912 Yields a High RF Output Signal (Rev. 0) ad9540
AN-837: DDS-Based Clock Jitter Performance vs. DAC Reconstruction Filter Performance (Rev. 0) ad9856
AN-621: Programming the AD9832/AD9835 ad9540
AN-557: An Experimenter's Project: (Rev. 0) ad9540
AN-419: A Discrete, Low Phase Noise, 125 MHz Crystal Oscillator for the AD9850 ad9540
AN-237: Choosing DACs for Direct Digital Synthesis ad9856
AN-423: Amplitude Modulation of the AD9850 Direct Digital Synthesizer ad9540
AN-345: Grounding for Low-and-High-Frequency Circuits ad9220
AN-342: Analog Signal-Handling for High Speed and Accuracy ad1674
AN-823: Direct Digital Synthesizers in Clocking Applications Time (Rev. 0) ad9856
AN-280: Mixed Signal Circuit Technologies ad1674
AN-605: Synchronizing Multiple AD9852 DDS-Based Synthesizers (Rev. 0) ad9540
AN-927: Determining if a Spur is Related to the DDS/DAC or to Some Other Source (For Example, Switching Supplies) (Rev. 0) ad9540
AN-587: Synchronizing Multiple AD9850/AD9851 DDS-Based Synthesizers (Rev. 0) ad9540
AN-772: 引脚架构芯片级封装（LFCSP）设计与制造指南 (Rev. 0) ad9540
AN-769: 基于AD9540产生多时钟输出 (Rev. 0) ad9540
AN-237: 放大器直接数字频率合成的DAC选型器应用漫谈 (Rev. 0) ad9540
AN-953: 具可编程模数的直接数字频率合成器(DDS) (Rev. 0) ad9540
AN-605: 同步多个基于DDS的频率合成器AD9852 (Rev. A) ad9540
AN-953: Direct Digital Synthesis (DDS) with a Programmable Modulus (Rev. B) ad9540
AN-939: 利用AD9912的超奈奎斯特频率操作得到高RF输出信号 (Rev. 0) ad9540
AN-927: 确定杂散来源是DDS/DAC还是其他器件(例如开关电源)[中文版] (Rev. 0) ad9540
AN-843: 用AD5933测量扬声器阻抗特性 (Rev. A) ad9830
AN-843: Measuring a Loudspeaker Impedance Profile Using the AD5933 (Rev. A) ad9830
AN-837: 基于DDS的时钟抖动性能与DAC重构滤波器性能的关系[中文版] (Rev. 0) ad9540
AN-772: A Design and Manufacturing Guide for the Lead Frame Chip Scale Package (LFCSP) (Rev. 0) ad9856
AN-823: 时钟应用中的直接数字频率合成器[中文版] (Rev. 0) ad9540
AN-851: 一种WiMax双下变频IF采样接收机设计方案[中文版] (Rev. 0) ad9540
AN-851: A WiMax Double Downconversion IF Sampling Receiver Design (Rev. 0) ad9856
AN-847: 用AD5933测量接地阻抗特性 (Rev. A) ad9856
AN-847: Measuring a Grounded Impedance Profile Using the AD5933 (Rev. A) ad9856
AN-345: 低频和高频电路接地 ad9540
AN-632: 利用AD9951 DDS作为ADN2812连续速率CDR的捷变参考时钟以提供数据速率 (Rev. 0) ad9540
AN-632: Provisionary Data Rates Using the AD9951 DDS as an Agile Reference Clock for the ADN2812 Continuous-Rate CDR (Rev. 0) ad9540
AN-621: AD9832/AD9835的编程 (Rev. 0) ad9540
AN-342: 高速、高精度处理模拟信号[中文版] (Rev. 0) ad9540
AN-557: 实验者项目： (Rev. 0) ad9540
AN-419: 用于完整的直接数字频率合成器AD9850的分立、低相位噪声、125MH晶振 (Rev. A) ad9540
AN-423: 直接数字频率合成器AD9850的幅度调制 (Rev. A) ad9540
AN-587: 同步多个基于DDS的频率合成器AD9850/AD9851 (Rev. 0) ad9540
AN-543: 利用ADSP-2181 DSP和AD9850直接数字频率合成器产生高质量、全数字RF频率调制 (Rev. A) ad9540
AN-543 - Monaural FM Transmitter ad9540
AN-543: High Quality, All-Digital RF Frequency Modulation Generation with the ADSP-2181 and the AD9850 DDS ad9540
AN-543 - Monaural FM Transmitter ad9540
Introducing Digital Up/Down Converters: VersaCOMM™ Reconfigurable Digital Converters ad9856
RF Source Booklet adf9010
Basics of Designing a Digital Radio Receiver (Radio 101) ad9856
Digital Up/Down Converters: VersaCOMM™ White Paper ad9856
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