GENERAL DESCRIPTION
The AD9915 is a direct digital synthesizer (DDS) featuring a 12-bit DAC. The AD9915 uses advanced DDS technology, coupled with an internal high speed, high performance DAC to form a digitally programmable, complete high frequency synthesizer capable of generating a frequency agile analog output sinusoidal waveform at up to 1.0 GHz. The AD9915 enables fast frequency hopping and fine tuning resolution (64-bit capable using programmable modulus mode). The AD9915 also offers fast phase and amplitude hopping capability.
   
FEATURES
    2.5 GSPS internal clock speed
    Integrated 12-bit DAC
    Frequency tuning resolution to 135 pHz
    16-bit phase tuning resolution
    12-bit amplitude scaling
    Programmable modulus
    Automatic linear and nonlinear frequency sweeping
        capability
    32-bit parallel datapath interface
    8 frequency/phase offset profiles
    Phase noise: −128 dBc/Hz (1 kHz offset at 978 MHz)
    Wideband SFDR < −57 dBc
    Serial or parallel input/output control
    1.8 V/3.3 V power supplies
    Software and hardware controlled power-down
    88-lead LFCSP package
    PLL REF CLK multiplier
    Phase modulation capability
    Amplitude modulation capability
    Multichip synchronization
   
APPLICATIONS
    Agile LO frequency synthesis
    Programmable clock generator
    FM chirp source for radar and scanning systems
    Test and measurement equipment
    Acousto-optic device drivers
    Polar modulator
    Fast frequency hopping