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AD9787:  Dual 14-Bit 800 MSPS DAC with Low Power 32-Bit Complex NCO

The AD9785/AD9787/AD9788 are 12-bit, 14-bit, and 16-bit, high dynamic range TxDAC® devices, respectively, that provide a sample rate of 800 MSPS, permitting multicarrier generation up to the Nyquist frequency. Features are included for optimizing direct conversion transmit applications, including complex digital modulation, as well as gain, phase, and offset compensation. The DAC outputs are ...More

AD9787:  Dual 14-Bit 800 MSPS DAC with Low Power 32-Bit Complex NCO

Product Description

The AD9785/AD9787/AD9788 are 12-bit, 14-bit, and 16-bit, high dynamic range TxDAC® devices, respectively, that provide a sample rate of 800 MSPS, permitting multicarrier generation up to the Nyquist frequency. Features are included for optimizing direct conversion transmit applications, including complex digital modulation, as well as gain, phase, and offset compensation. The DAC outputs are optimized to interface seamlessly with analog quadrature modulators, such as the ADL537x family from Analog Devices, Inc. A serial peripheral interface (SPI) provides for programming and readback of many internal parameters. Full-scale output current can be programmed over a range of 10 mA to 30 mA. The AD978x family is manufactured on a 0.18 μm CMOS process and operates from 1.8 V and 3.3 V supplies. It is enclosed in a 100-lead TQFP package.

Product Highlights

  1. Low noise and intermodulation distortion (IMD) enable high quality synthesis of wideband signals from baseband to high intermediate frequencies.
  2. Proprietary DAC output switching technique enhances dynamic performance.
  3. CMOS data input interface with adjustable setup and hold.
  4. Low power complex 32-bit numerically controlled oscillators (NCOs).

Applications

  • Wireless infrastructure
    • WCDMA, CDMA2000, TD-SCDMA, WiMAX, GSM
  • Digital high or low IF synthesis
  • Transmit diversity
  • Wideband communications
    • LMDS/MMDS, point-to-point

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    • Analog output: adjustable 8.7 mA to 31.7 mA, RL = 25 Ω to 50 Ω
    • Low power, fine complex NCO allows carrier placement anywhere in DAC bandwidth while adding <300 mW power
    • Auxiliary DACs allow I and Q gain matching and offset control
    • Includes programmable I and Q phase compensation
    • Internal digital upconversion capability
    • Multiple chip synchronization interface
    • High performance, low noise PLL clock multiplier
    • Digital inverse sinc filter
    • 100-lead, exposed paddle TQFP package
    • Resolution (Bits): 14bit
    • DAC Update Rate: 800MSPS
    • DAC Settling Time: n/a
    • # DAC Outputs: 2
    • DAC Type: Current Out
    • DAC Input Format: Par
    • Output FSR: Adj(10mA FS to 30mA FS)
    • Ref Int/Ext: Int
    • Supply Vnom: Multi(+1.8, +3.3)
    • Pwr Diss: 450mW
    • Package: QFP

    AD9787 Functional Block Diagram

    类似产品

    arrow View Full Interactive Product Selection Table
    Part# Bits Update Rate Settling Time # Outputs
    AD9778 14 1GSPS - 2
    AD9778A 14 1GSPS - 2
    AD9787 14 800MSPS - 2
    AD9789 14 2.4GSPS 13ns 1
    AD9736 14 1.2GSPS - 1
    AD9739 14 2.5GSPS - 1
    AD9779 16 1GSPS - 2
    AD9779A 16 1GSPS - 2
    AD9776A 12 1GSPS - 2
    AD9788 16 800MSPS - 2
    AD9785 12 800MSPS - 2
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