添加到信号链设计器

AD9778:  Dual 14-Bit, 1 GSPS, Digital-to-Analog Converter

产品详情

The AD9776/AD9778/AD9779 are dual, 12-/14-/16-bit, high dynamic range, digital-to-analog converters (DACs) that provide a sample rate of 1 GSPS, permitting multicarrier generation up to the Nyquist frequency. They include features optimized for direct conversion transmit applications, including complex digital modulation, and gain and offset compensation. The DAC outputs are optimized to interface seamlessly with analog quad-rature modulators such as the AD8349. A serial peripheral interface (SPI®) provides for programming/readback of many internal parameters. Full-scale output current can be programmed over a range of 10 mA to 30 mA. The devices are manufactured on an advanced 0.18 μm CMOS process and operate on 1.8 V and 3.3 V supplies for a total power consumption of 1.0 W. They are enclosed in 100-lead TQFP packages.

Product Highlights

  1. Ultralow noise and intermodulation distortion (IMD) enable high quality synthesis of wideband signals from baseband to high intermediate frequencies.
  2. A proprietary DAC output switching technique enhances dynamic performance.
  3. The current outputs are easily configured for various single-ended or differential circuit topologies.
  4. CMOS data input interface with adjustable set up and hold.
  5. Novel 2×, 4×, and 8× interpolator/coarse complex modulator allows carrier placement anywhere in DAC bandwidth.

Applications

  • Wireless infrastructure
    WCDMA, CDMA2000, TD-SCDMA, WiMax, GSM
  • Digital high or low IF synthesis
  • Internal digital upconversion capability
  • Transmit diversity
  • Wideband communications: LMDS/MMDS, point-to-point
  • Data Sheet, Rev. A, 3/07

    特点和优势

    • Low power: 1.0 W @ 1 GSPS, 600 mW @ 500 MSPS, full operating conditions
    • SFDR = 78 dBc to fOUT = 100 MHz
    • Single carrier WCDMA ACLR = 79 dBc @ 80 MHz IF
    • Analog output: adjustable 8.7 mA to 31.7 mA, RL = 25 Ω to 50 Ω
    • Novel 2×, 4×, and 8× interpolator/coarse complex modulator allows carrier placement anywhere in DAC bandwidth
    • Auxiliary DACs allow control of external VGA and offset control
    • Multiple chip synchronization interface
    • High performance, low noise PLL clock multiplier
    • Digital inverse sinc filter
    • 100-lead, exposed paddle TQFP package

    Functional Block Diagram for AD9778

    新设计不再推荐使用AD9778,建议用AD9778A 代替。

    若要评估所有ADI的高速ADC器件,将需要购买或租借一个数据模式发生器。欲了解更多信息,请点击 此处

    设计工具,模型,驱动及软件

    快讯名称 内容类型 文件类型
    DAC 谐波分析器
    这款工具能够显示DAC输出中的谐波镜像和杂散。用户可以定义一个后置DAC模拟滤波器来抑制这些镜像。此滤波器的影响绘制成图形,显示在随附的图表中。
    DAC Harmonic Analyzer HTML
    AD9778 IBIS Models IBIS 模型 HTML

    评估套件,原理图符号和PCB封装

    原理图符号和PCB封装— ADI公司提供与当今众多CAD系统兼容的原理图符号和PCB封装(Symbols & Footprints),以便更广泛、更轻松地使用。

    Sample样片申请及购买

    价格,封装及供货状态

    AD9778 型号选项
    帮助

    这里所列出的美国报价单仅供预算参考,指美元报价(规定订量的每片美元,美国离岸价),如有修改不再另行通知。由于地区关税、商业税、汇率及手续费原因,国际报价可能不同。对于特殊批量报价,请与您当地的ADI公司办事处或代理商联络。对于评估板和套件的报价是指一个单位价格。

    沪ICP备09046653号
    产品评价 X
    content here.
    content here.

    产品评价

    关闭