应用功能:400 MSPS 14-Bit, 1.8V CMOS Direct Digital Synthesizer The AD9954 is a Direct Digital Synthesizer (DDS) featuring a14-bit DAC operating up to 400MSPS. The AD9954 uses advanced DDS technology, coupled with an internal high-speed,high performance D/A converter to form a digitallyprogrammable,complete high-frequency synthesizer capable of generating a frequency-agile analog output sinusoidal waveform at up to 200 MHz.