AD9958 2-Channel 500 MSPS DDS with 10-Bit DACs

The AD9958 consists of two DDS cores that provide indepen- dent frequency, phase, and amplitude control on each channel. This flexibility can be used to correct imbalances between signals due to analog processing, such as filtering, amplification, or PCB layout related mismatches. Because both channels share a common system clock, they are inherently synchronized. Synchronization of multiple devices is supported.

The AD9958 can perform up to a 16-level modulation of frequency, phase, or amplitude (FSK, PSK, ASK). Modulation is performed by applying data to the profile pins. In addition, the AD9958 also supports linear sweep of frequency, phase, or amplitude for applications such as radar and instrumentation.

The AD9958 serial I/O port offers multiple configurations to provide significant flexibility. The serial I/O port offers an SPI- compatible mode of operation that is virtually identical to the SPI operation found in earlier Analog Devices, Inc., DDS products. Flexibility is provided by four data pins (SDIO_0/ SDIO_1/SDIO_2/SDIO_3) that allow four programmable modes of serial I/O operation.

The AD9958 uses advanced DDS technology that provides low power dissipation with high performance. The device incorporates two integrated, high speed 10-bit DACs with excellent wideband and narrow-band SFDR. Each channel has a dedicated 32-bit frequency tuning word, 14 bits of phase offset, and a 10-bit output scale multiplier.

The DAC outputs are supply referenced and must be termin- ated into AVDD by a resistor or an AVDD center-tapped transformer. Each DAC has its own programmable reference to enable different full-scale currents for each channel.

The DDS acts as a high resolution frequency divider with the REFCLK as the input and the DAC providing the output. The REFCLK input source is common to both channels and can be driven directly or used in combination with an integrated REFCLK multiplier (PLL) up to a maximum of 500 MSPS. The PLL multiplication factor is programmable from 4 to 20, in integer steps. The REFCLK input also features an oscillator circuit to support an external crystal as the REFCLK source. The crystal must be between 20 MHz and 30 MHz. The crystal can be used in combination with the REFCLK multiplier.

The AD9958 comes in a space-saving 56-lead LFCSP package. The DDS core (AVDD and DVDD pins) is powered by a 1.8 V supply. The digital I/O interface (SPI) operates at 3.3 V and requires the pin labeled DVDD_I/O (Pin 49) be connected to 3.3 V.

The AD9958 operates over the industrial temperature range of −40°C to +85°C.

Applications
  • Agile L.O. frequency synthesis
  • Phased array radar / sonar
  • Instrumentation
  • Synchronized clocking
  • RF source for AOTF
  • Single-side band suppressed carriers
  • Quadrature communications

Data Sheet, Rev. A, 07/08

Features and Benefits
  • Two synchronized DDS channels @500 MSPS
  • Independent frequency / phase / amplitude control between all channels
  • Matched latencies for Freq, Phase, and Amplitude changes
  • Excellent channel to channel isolation
  • Linear frequency/phase/amplitude sweeping capability
  • Up to 16 levels of frequency/phase/amplitude modulation (pin-selectable)
  • 2 integrated 10-bit digital-to-analog converters (DACs)
  • See Data Sheet for Additional Information
    • RF & Microwave
    Data Sheets
    Documentnote
    AD9958: 2-Channel 500 MSPS DDS with 10-Bit DACs Data Sheet (Rev. B)PDF 1051 kB
    Application Notes
    Documentnote
    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-851: A WiMax Double Downconversion IF Sampling Receiver Design (Rev. 0)PDF 262 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
    Frequently Asked Questions
    Documentnote
    Order Information
    Part NumberPackagePacking QtyTemp RangePrice 100-499Price 1000+RoHS
    AD9958BCPZ Production56 ld LFCSP (8x8mm)OTH 260-40 to 85C25.7821.91Y
    AD9958BCPZ-REEL7 Production56 ld LFCSP (8x8mm)REEL 750-40 to 85C021.91Y
    Evaluation Boards
    Part NumberDescriptionPriceRoHS
    AD9958/PCBZEvaluation Board400Y
    Reference Materials
    AD9958: 2-Channel 500 MSPS DDS with 10-Bit DACs Data Sheet (Rev. B) ad9958
    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-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-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-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-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
    CN-0186: Phase Coherent FSK Modulator ad9520-0
    CN-0109: Low Jitter Sampling Clock Generator for High Performance ADCs Using... ad9512
    Basics of Designing a Digital Radio Receiver (Radio 101) ad9856
    Digital Up/Down Converters: VersaCOMM™ White Paper ad9856
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