This is a 400 MSPS 14-bit, 1.8 V CMOS Direct Digital Synthesizer AD9951 produced by Analog Devices. The product has 400 MSPS internal clock speed, integrated 14-bit DAC, 32-bit tuning word, ≤-120 dBc/Hz@1 kHz offset (DAC output), excellent dynamic performance, >80 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, etc. The product is mainly used in agile LO frequency synthesis, programmable clock generators, test and measurement equipment, acousto-optic device drivers, etc.
The AD9951 is a direct digital synthesizer (DDS) featuring a 14-bit DAC operating up to 400 MSPS. It 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 device is designed to provide fast frequency hopping and fine tuning resolution via a 32-bit frequency tuning word loaded through a serial I/O port.
| Internal Clock Speed | 400 MSPS |
|---|---|
| DAC Resolution | 14-bit |
| Frequency Tuning Word | 32-bit |
| Phase Noise | < -120 dBc/Hz @ 1 kHz offset |
| SFDR | >80 dB @ 160 MHz |
| Power Supply | 1.8 V |
| Operating Temperature | -40°C to +105°C |
| Package | 48-lead TQFP/EP |
The device can generate a frequency-agile analog output sinusoidal waveform at up to 200 MHz.
The frequency tuning and control words are loaded into the AD9951 via a serial I/O port.
The phase noise is less than -120 dBc/Hz at a 1 kHz offset at the DAC output.