优势和特点

  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

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

  Ultralow noise and intermodulation distortion (IMD) enable high quality synthesis of wideband signals from baseband to high intermediate frequencies.

  A proprietary DAC output switching technique enhances dynamic performance.

  The current outputs are easily configured for various single-ended or differential circuit topologies.

  CMOS data input interface with adjustable set up and hold.

  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