AD9951 DDS

The Direct Digital Synthesis (DDS) Unit described in this document is based on the Analog Devices AD9951/54 family chips.
Featuring advanced technology, high speed 14 bit Digital to Analog Converter, capable of generating a frequency-agile analog
output sinusoidal waveform at up to 200 MHz with a fine tuning resolution of 32 bits.

DDS assembled inside metal box (90 x 35 mm)

The Unit consists of a 2-layer pcb providing maximum flexibility in a minimum size, it includes room and facilities for:

the 3,3 Volt Digital Vdd regulator
the 1,8 Volt Analog Vdd regulator
Quartz or On Board / External Oscillator
Low-Pass Filtering and a Wide-Band linear Amplifier

The Unit can be interfaced to a micro based controller trough a suitable 6 pin connector.

This Project has been developed thank to the strictly collaborated work of i0CG, Giuliano and i0GLU, Giancarlo.

AD9951 spectrogram with 50 MHz Spam F. out = 42.8 MHz

AD9951 spectrogram with 50 MHz Spam F. out = 15 MHz (only armonics are visible)

The spectrogram for the OLD AD9851 DDS with F.= 42.8 MHz

ED2 Prototype

This is the NEW 500Mhz oscillator used in DDS-X

Using this external 500Mhz oscillator, DDS-X is real spurious free

Oscillator output spectrum

I0CG DDS controller based to PIC18F252 /PIC18F2620

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Download: DDS-4 manual for use with Vintage radio (Collins, Drake....)

Download: manual for DDS control for general use ( SDR, hombrew RTX project...)