AD9854 digital synthesizer is a highly integrated device that uses advanced DDS technology, built two high-speed, high performance quadrature DAC, together form a digitally programmable I and Q synthesizer. When precision clock source as a reference, AD9854 generates highly stable frequency - phase, amplitude-programmable sine and cosine outputs can be used as communications, radar, and many other applications agile LO. Innovative high speed DDS core provides 48-bit frequency resolution (using the 300 MHz SYSCLK, the tuning resolution of 1 μHz). 17 can be maintained to ensure that the device has excellent spurious-free dynamicrange (SFDR).
This AD9854 DDS module is easy to use with four complementary sine wave output, two plus 120MHz official low-pass filter, one is square wave output, and square wave can be adjusted by sliding rheostat duty cycle.
This design is to facilitate the majority of student users and project users for secondary development and use.
This module is by far the third generation of products, optimize the previous two generations of various parameters and routing mode, because it involves high-frequency signal output, the layout of the board and the choice of materials will make a big difference, power supply using the original LM317 1.5A TO263 package of the linear chip, not only the input voltage range, and can provide enough high current, we all know this module's power consumption is of about 4.5W, So the need to provide a strong power system is to make AD9854 stable and reliable, we do our best using large-capacity tantalum capacitors as power supply filter, so that power ripple better. At the same time our AD9854 support external clock input as a reference clock, support all the way FSK modulation output, user-friendly expansion. In the PCB layout above, in strict accordance with the RF traces, through the APPCAD calculation of impedance and phase delay, etc., can effectively reduce the signal Dagon subtraction, especially the high-frequency signal, the power line are followed by the shortest circuit to provide current , Reduce the power supply interference, the data bit with 26PINS pin as an interface, the user can use the standard horn seat as a connector, very easy to use. We carefully in the design, the purpose is to facilitate the majority of users of product design and debugging.
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