The AD9953 is a direct digital synthesizer （DDS） featuring a 14-bit DAC operating up to 400 MSPS. The AD9953 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 AD9953 includes an integrated 1024 × 32 static RAM to support flexible frequency sweep capability in several modes. The AD9953 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 AD9953 via a serial I/O port. The AD9953 is specified to operate over the extended industrial temperature range of –40°C to +105°C.