GENERAL DESCRIPTION
The AD9859 is a direct digital synthesizer (DDS) featuring a 10-bit DAC operating at up to 400 MSPS. The AD9859 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 200 MHz. The AD9859 is designed to provide fast frequency hopping and fine tuning resolution (32-bit frequency tuning word). The frequency tuning and control words are loaded into the AD9859 via a serial I/O port.

FEATURES
    400 MSPS internal clock speed
    Integrated 10-bit DAC
    32-bit tuning word
    Phase noise ≤ –120 dBc/Hz @ 1 kHz offset (DAC output)
    Excellent dynamic performance
        >75 dB SFDR @ 160 MHz (±100 kHz offset) AOUT
    Serial I/O control
    1.8 V power supply
    Software and hardware controlled power-down
    48-lead TQFP/EP package
    Support for 5 V input levels on most digital inputs
    PLL REFCLK multiplier (4× to 20×)
    Internal oscillator; can be driven by a single crystal
    Phase modulation capability
    Multichip synchronization

APPLICATIONS
    Agile LO frequency synthesis
    Programmable clock generators
    Test and measurement equipment
    Commercial and amateur radio exciter